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Tulane University
1.
Ezeh, Chike.
NOVEL IDEAS FOR ENHANCED OIL RECOVERY AND OIL SPILL REMEDIATION IN POROUS MEDIA.
Degree: 2019, Tulane University
URL: https://digitallibrary.tulane.edu/islandora/object/tulane:92429 
► [email protected]
Enhanced oil recovery (EOR) and oil spill remediation (OSR) in porous media both share a common theme in that they can both be modeled…
(more)
▼ [email protected]
Enhanced oil recovery (EOR) and oil spill remediation (OSR) in porous media both share a common theme in that they can both be modeled as a system comprising of two immiscible liquid phases and a solid porous phase. EOR seeks to improve the recovery of crude oil from existing oil reserves, while OSR improves ecological sustainability. In this thesis two novel techniques with the potential of improving the recovery of non-aqueous phase liquid (NAPL) that is trapped in a water filled random porous media.
In the first project, an oil-soluble surfactant was studied to enhance crude oil mobilization in a cryolite-packed miniature bed. The cryolite packed bed provided a transparent, random porous medium for observation at the microscopic level. In the first part of the project, oil-soluble surfactants; Span 80 and Eni-surfactant (ES) were dissolved directly into the crude oil. The porous medium was imbued with the crude oil (containing the surfactants), and deionized water was the flooding phase, in this experiment, the system containing ES had the best performance. Subsequently, Sodium Dodecyl Sulfate (SDS), a hydrosoluble surfactant was used to solubilize the ES, with the SDS acting as a carrier for the ES to the contaminated porous media. Finally, the SDS/Eni-Surfactant micellar solutions were used in oil-removal tests on the packed bed. Grayscale image analysis was used to quantify the oil recovery effectiveness for the flooding experiments by measuring the white pixel percentage in the packed bed images. The SDS/ES flooding mixture had a better performance than the SDS alone.
Furthermore, a model liquid hydrocarbon (n-hexadecane) was used to gain insight on the mobilization of non-aqueous phase liquids (NAPLs) trapped in porous formations, important for both EOR and oil spill remediation in porous media. Food-grade surfactants lecithin from soy and tween 80 were compared to commercial dispersant Corexit 9500A, for their ability to mobilize the hydrocarbon originally trapped in a water-filled cryolite porous medium. Red dye was added to the n-Hexadecane to improve visualization, and the aqueous phase incorporated different ratios of the surfactants Lecithin and Tween 80 to seek synergistic benefits when the two surfactants are combined. Visual-microscopic flooding experiments carried on a miniature packed bed produced images which were then analyzed using grayscale image analysis. It was determined that a ratio 40:60 by weight of Lecithin to Tween 80 has the best performance in the mobilization of n-hexadecane from the porous media. Furthermore, any (non-optimal) mixture of lecithin and tween 80 exhibited a better (synergistic) performance in n-Hexadecane recovery from the porous media than when applying either surfactant separately.
Finally, applying the video-microcapillary technique utilized in the first two projects, but with a slight modification, the effect of temperature change on a highly viscous oil phase flowing through a water-filled porous media was studied. The glass microcapillary…
Advisors/Committee Members: (author), PAPADOPOULOS, KYRIAKOS (Thesis advisor), (Thesis advisor), School of Science & Engineering Chemical and Biomolecular Engineering (Degree granting institution), NULL (Degree granting institution).
Subjects/Keywords: Porous media
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APA (6th Edition):
Ezeh, C. (2019). NOVEL IDEAS FOR ENHANCED OIL RECOVERY AND OIL SPILL REMEDIATION IN POROUS MEDIA. (Thesis). Tulane University. Retrieved from https://digitallibrary.tulane.edu/islandora/object/tulane:92429
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ezeh, Chike. “NOVEL IDEAS FOR ENHANCED OIL RECOVERY AND OIL SPILL REMEDIATION IN POROUS MEDIA.” 2019. Thesis, Tulane University. Accessed March 04, 2021.
https://digitallibrary.tulane.edu/islandora/object/tulane:92429.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ezeh, Chike. “NOVEL IDEAS FOR ENHANCED OIL RECOVERY AND OIL SPILL REMEDIATION IN POROUS MEDIA.” 2019. Web. 04 Mar 2021.
Vancouver:
Ezeh C. NOVEL IDEAS FOR ENHANCED OIL RECOVERY AND OIL SPILL REMEDIATION IN POROUS MEDIA. [Internet] [Thesis]. Tulane University; 2019. [cited 2021 Mar 04].
Available from: https://digitallibrary.tulane.edu/islandora/object/tulane:92429.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ezeh C. NOVEL IDEAS FOR ENHANCED OIL RECOVERY AND OIL SPILL REMEDIATION IN POROUS MEDIA. [Thesis]. Tulane University; 2019. Available from: https://digitallibrary.tulane.edu/islandora/object/tulane:92429
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
2.
Srinivasan, Shriram.
Modelling Flow through Porous Media under Large Pressure Gradients.
Degree: 2013, Texas Digital Library
URL: http://hdl.handle.net/1969;
http://hdl.handle.net/2249.1/66643
► The most interesting and technologically important problems in the study of flow through porous media involve very high pressures and pressure gradients in the flow…
(more)
▼ The most interesting and technologically important problems in the study of flow through
porous media involve very high pressures and pressure gradients in the flow do- main such as enhanced oil recovery and carbon dioxide sequestration. The popular Darcy or Brinkman models do not take into account the changes in the fluid properties (like viscosity) due to high pressures and temperatures, or the deformation of the solid itself as the fluid flows through it. We focus on the pressure dependence of viscosity and show that its significance in these problems cannot be neglected.
Mixture theory is employed as the tool to develop models for this task. The popular models due to Darcy and Brinkman (and their generalizations) are derived using a general thermodynamic framework which appeals to the criterion of maximal rate of entropy production. Such a thermodynamic approach has been used with great success to describe various classes of material response and here we demonstrate its use within the context of mixture theory. One such generalization of the Brinkman model takes into account the variation of the viscosity and the drag coefficient with the pressure and is used in the problems studied subsequently.
We then consider the steady flow of a fluid through a
porous slab, driven by a large pressure gradient, and show that the traditional approach that ignores the variation of the viscosity and drag with the pressure greatly over-predicts the mass flux taking place through the
porous structure. While incorporating the pressure dependence of viscosity and drag leads to a ceiling flux, the traditional approaches lead to a continued increase in the flux with the pressure difference.
The effect of inhomogeneities and anisotropy of the
porous medium is investigated by modifying the previous problem to prescribe the drag coefficient as a piecewise constant, positive definite second order tensor. Finally, we allow for the possibility that the flow is unsteady, the viscosity and drag are dependent on the pressure and consider the flow of a fluid due to a pulsatile forcing pressure at one end of a rigid, homogenoues, isotropic solid while the other end is open to the atmosphere. In contrast to certain non-Newtonian fluids where the volumetric flux is enhanced by pulsating the pressure gradient about a non-zero mean value, we find that pulsations in the pressure diminish the volumetric flux in case of the flow through a
porous medium when the fluid viscosity is considered to be pressure dependent.
Advisors/Committee Members: Rajagopal, Kumbakonam (advisor).
Subjects/Keywords: porous media
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APA (6th Edition):
Srinivasan, S. (2013). Modelling Flow through Porous Media under Large Pressure Gradients. (Thesis). Texas Digital Library. Retrieved from http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66643
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Srinivasan, Shriram. “Modelling Flow through Porous Media under Large Pressure Gradients.” 2013. Thesis, Texas Digital Library. Accessed March 04, 2021.
http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66643.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Srinivasan, Shriram. “Modelling Flow through Porous Media under Large Pressure Gradients.” 2013. Web. 04 Mar 2021.
Vancouver:
Srinivasan S. Modelling Flow through Porous Media under Large Pressure Gradients. [Internet] [Thesis]. Texas Digital Library; 2013. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66643.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Srinivasan S. Modelling Flow through Porous Media under Large Pressure Gradients. [Thesis]. Texas Digital Library; 2013. Available from: http://hdl.handle.net/1969; http://hdl.handle.net/2249.1/66643
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Waterloo
3.
Brookshaw, Steven.
An Analytical Solution to Transient Composite Domain Diffusion and its Potential Applications.
Degree: 2020, University of Waterloo
URL: http://hdl.handle.net/10012/16080
► The work developed here was initially made to provide a comprehensive model for the modified Loschmidt cell, but the project evolved to derive a more…
(more)
▼ The work developed here was initially made to provide a comprehensive model for the modified
Loschmidt cell, but the project evolved to derive a more robust transient composite domain diffusion
(TCDD) model. The original work created a symmetrical TCDD model in cartesian coordinates. But the
project grew to create a TCDD model for: any geometry, symmetric / non-symmetric and for any
homogenous exterior boundary condition. The expansion of the work allows for this TCDD model to apply
to more applications. Since, many complex experiments resort to quasi-steady state models to perform
their analysis, when a more accurate TCDD model would be better suited. For instance, the need for a
more accurate model for the modified Loschmidt cell was shown in [1], where the quasi-steady state
model currently used to extract the effective diffusion coefficient had errors potentially as high as 100%.
Whereas, the model developed here does not employ any assumptions regarding their experiment, and
thus would yield better results. The model developed utilized Vodicka’s Orthogonality to resolve the
inhomogeneous boundary conditions applied to the interior boundaries of the composite domain. The
model was validated experimentally, by adapting a known radial diffusion experiment to become a
composite domain diffusion experiment. The experiment, created by Kim [2], was adapted by performing
it on an annulus disk and retrieving the effective diffusivity using the TCDD model and comparing those
results to the solid disk’s. From this experiment it was statistically shown that the two models retrieved
the same values, thus validating the TCDD model. Also, this thesis analyzed which solver was best to
conduct parameter estimation on the model, by creating artificial data of a modified Loschmidt cell and
fitting the known effective diffusivity that produced the concentration profile. It was discovered that in
simple geometries, derivative based solvers work best. However, as the modified Loschmidt cell reached
8 different domains of diffusion, a brute force tactic was considerably more accurate. Therefore, since this
model developed is equipped to replace the erroneous quasi-steady state model of the modified
Loschmidt cell, it should be employed to perform its parameter estimation.
Subjects/Keywords: Porous media
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APA (6th Edition):
Brookshaw, S. (2020). An Analytical Solution to Transient Composite Domain Diffusion and its Potential Applications. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/16080
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Brookshaw, Steven. “An Analytical Solution to Transient Composite Domain Diffusion and its Potential Applications.” 2020. Thesis, University of Waterloo. Accessed March 04, 2021.
http://hdl.handle.net/10012/16080.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Brookshaw, Steven. “An Analytical Solution to Transient Composite Domain Diffusion and its Potential Applications.” 2020. Web. 04 Mar 2021.
Vancouver:
Brookshaw S. An Analytical Solution to Transient Composite Domain Diffusion and its Potential Applications. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10012/16080.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Brookshaw S. An Analytical Solution to Transient Composite Domain Diffusion and its Potential Applications. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/16080
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Oxford
4.
Auton, Lucy.
Large fluid-driven deformations of porous annuli : solutions via Chebyshev spectral collocation.
Degree: PhD, 2018, University of Oxford
URL: http://ora.ox.ac.uk/objects/uuid:0d8641fe-d6c9-4195-b770-692caced5590
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.780459
► The radially outward flow of fluid into a porous medium occurs in many practical problems, from transport across vascular walls to the pressurisation of boreholes.…
(more)
▼ The radially outward flow of fluid into a porous medium occurs in many practical problems, from transport across vascular walls to the pressurisation of boreholes. As the driving pressure becomes non-negligible relative to the stiffness of the solid structure, the poromechanical coupling between the fluid and the solid has an increasingly strong impact on the flow. For very large pressures or very soft materials, as is the case for hydraulic fracturing and arterial flows, this coupling can lead to large elastic deformations or plastic flow and hence to strong deviations from a classical, linear poroelastic response. In this thesis, we investigate large deformation poroelasticity and poroelasto-plasticity via the use of a simple axisymmetric model problem. We use the relative simplicity of this model problem to conduct the first systematic analysis of the effects of driving method, geometry and numerous facets of nonlinearity on the resulting flow and deformation. We consider two different permeability laws (constant vs. Kozeny-Carman), two stress-strain relationships (Hencky vs. linear), and two constitutive solid behaviours (elasticity vs. elasto-plasticity). We solve these models analytically when possible and using Chebyshev spectral collocation in general. Large deformations are inherently nonlinear, and these nonlinear effects manifest themselves within the kinematics, permeability, and elastic or plastic stress-strain relations. By isolating each of these effects, we assess the impact of different model simplifications for a wide range of parameter values. In addition to the physical insight they provide, our results and numerical codes could prove useful for benchmarking general numerical- simulation tools.
Subjects/Keywords: deformable porous media; Porous materials
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APA (6th Edition):
Auton, L. (2018). Large fluid-driven deformations of porous annuli : solutions via Chebyshev spectral collocation. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:0d8641fe-d6c9-4195-b770-692caced5590 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.780459
Chicago Manual of Style (16th Edition):
Auton, Lucy. “Large fluid-driven deformations of porous annuli : solutions via Chebyshev spectral collocation.” 2018. Doctoral Dissertation, University of Oxford. Accessed March 04, 2021.
http://ora.ox.ac.uk/objects/uuid:0d8641fe-d6c9-4195-b770-692caced5590 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.780459.
MLA Handbook (7th Edition):
Auton, Lucy. “Large fluid-driven deformations of porous annuli : solutions via Chebyshev spectral collocation.” 2018. Web. 04 Mar 2021.
Vancouver:
Auton L. Large fluid-driven deformations of porous annuli : solutions via Chebyshev spectral collocation. [Internet] [Doctoral dissertation]. University of Oxford; 2018. [cited 2021 Mar 04].
Available from: http://ora.ox.ac.uk/objects/uuid:0d8641fe-d6c9-4195-b770-692caced5590 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.780459.
Council of Science Editors:
Auton L. Large fluid-driven deformations of porous annuli : solutions via Chebyshev spectral collocation. [Doctoral Dissertation]. University of Oxford; 2018. Available from: http://ora.ox.ac.uk/objects/uuid:0d8641fe-d6c9-4195-b770-692caced5590 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.780459
NSYSU
5.
Huang, Pei-chi.
Study on Wave Field with Multiple Porous Layers.
Degree: Master, Marine Environment and Engineering, 2010, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907110-174347
► Wave interaction with a rubble-mound breakwater has been studied experimentally in the thesis. The breakwater may contain multi-layer anisotropic but homogeneous media. Fluid outside the…
(more)
▼ Wave interaction with a rubble-mound breakwater has been studied experimentally in the thesis.
The breakwater may contain multi-layer anisotropic but homogeneous
media. Fluid outside the
porous layer field is assumed to incompressible and viscous,and the flow field is irrational. The study
applies the velocity potential to describe the wave field with small amplitude incident wave.
Under the consideration of linearity, Analytical solution is solved from boundary value
program by the method of separation of variables. It bases on dispersion equation. Try to find the
range and position of the complex eigenvalues in each
porous column and to solve the velocity
potential in the field by numerical methods. Wave reflection, transmission, and energy dissipation
with a rubble-mound breakwater have been investigated experimentally, and consider the wave close
linear wave theory, the wave steepness smaller than 0.035. Three different sizes of grain are used to
construct the
porous base, they are 16mm, 25mm, and 35mm, respectively. Single and double layers
of
porous base are considered.
Some of the reflection coefficient are convergence, but they are the unreasonable results.
Maybe the trouble is in the process of the computation with determination of .eigenvalues. When the
wave has long period, the double-layer
porous model reduces more wave energy, when the wave has
short period, the single-layer
porous and the smaller
porous material model can disappears more wave
energy. The characteristic of internal resistance in the
porous has the difference along with the wave
period. When the model crest is higher than the sea level, the consumption of wave energy are more
when it is shorter along with the wave period. As a submerged breakwater, the effect for disappears
wave energy to be limited.
Advisors/Committee Members: Tai-Wen Hsu (chair), Chung-Pan Lee (committee member), Yang-Yih Chen (chair), I-Fan Tseng (chair), Yung-Fang Chiu (chair).
Subjects/Keywords: permeable structure; porous media
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APA ·
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Manager
APA (6th Edition):
Huang, P. (2010). Study on Wave Field with Multiple Porous Layers. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907110-174347
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Huang, Pei-chi. “Study on Wave Field with Multiple Porous Layers.” 2010. Thesis, NSYSU. Accessed March 04, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907110-174347.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Huang, Pei-chi. “Study on Wave Field with Multiple Porous Layers.” 2010. Web. 04 Mar 2021.
Vancouver:
Huang P. Study on Wave Field with Multiple Porous Layers. [Internet] [Thesis]. NSYSU; 2010. [cited 2021 Mar 04].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907110-174347.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Huang P. Study on Wave Field with Multiple Porous Layers. [Thesis]. NSYSU; 2010. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907110-174347
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
6.
Chou, Chun-ting.
Study on Wave Field with Caisson on Multiple Porous Layers.
Degree: Master, Marine Environment and Engineering, 2010, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907110-175213
► In the study, wave reflection, transmission, and energy dissipation with a caisson-type breakwater have been investigated experimentally. Three different sizes of grain are used to…
(more)
▼ In the study, wave reflection, transmission, and energy dissipation with a caisson-type breakwater have been investigated experimentally. Three different sizes of grain are used to construct the
porous base, they are 16mm, 25mm, and 35mm, respectively.Single and double layers of
porous base are considered.
Hydraulic test,
porous media choice is glass ball.Wave conditions must be consistent with the scope of the linear wave theory. Two different depths are used to construct,they are 40 cm and 72 cm. Do a single trial of all size. Double size 16mm and 35mm
diameter glass ball is a test. Recording the test process, and then analyze energy
consumption. Water area's characteristics and pore area's characteristics are calculated
by the Newtonâs method and the Wardâs method. It is the substitute for the dispersion
equation is also correct. During the course of a series, the draft of caisson is deeper, the
convergence is harder. But the increase and decrease the mode number or the draft, and
sometimes increase the possible of convergence. As the number of cutting layer are
more complex than other predecessors, particularly in the large number of required
mode, when the composition of the matrix of boundary conditions greater complexity.
In the caisson area calculated pore velocity, or on behalf of the later is very large, so it's
easy in the solution process, generate positive infinity or negative infinity error.
As the caisson-type breakwater with a shorter wavelength, the frictional resistance influences bigger. At this time, reflectance and transmittance has the Drop tendency.When the wavelength is longer, the frictional resistance influences smaller. Most of the
energy reflection because the caisson of less permeable. The caisson-type breakwater got the wave force to increase. The effect is bad in the Wave force reduced. If the static water surface above the pore structure, the caisson-type breakwater can be reduction of about 30% to 40% off the energy. If the static water surface under the pore structure, the
caisson-type breakwater wave damping efficiency is better. Usually remove 30% to 70% energy. Sometimes, itâs up to about 90%.Reflectivity of the caisson breakwater is larger, but the transmissivity is lower. For the waters behind the breakwater, the
protective effect is significant. Transmissivity trend is arranged according to
media size. As the
media size smaller, the transmissivity is smaller, the reflectivity is higher. At the same depth, double-size model compared with other single-size model of the wave
forces reduced is better. Whether long or short period, double-size model's performance is relatively stable. Except to a long cycle time, the wave damping efficiency has a larger range. Other cycles are at the lower position.
Advisors/Committee Members: Yang-yih Chen (chair), Yung-Fang Chiu (chair), Chung-pan Lee (committee member), Tai-wen Hsu (chair), I-fan Tseng (chair).
Subjects/Keywords: caisson; media size; transmissivity; porous
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Manager
APA (6th Edition):
Chou, C. (2010). Study on Wave Field with Caisson on Multiple Porous Layers. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907110-175213
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chou, Chun-ting. “Study on Wave Field with Caisson on Multiple Porous Layers.” 2010. Thesis, NSYSU. Accessed March 04, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907110-175213.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chou, Chun-ting. “Study on Wave Field with Caisson on Multiple Porous Layers.” 2010. Web. 04 Mar 2021.
Vancouver:
Chou C. Study on Wave Field with Caisson on Multiple Porous Layers. [Internet] [Thesis]. NSYSU; 2010. [cited 2021 Mar 04].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907110-175213.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chou C. Study on Wave Field with Caisson on Multiple Porous Layers. [Thesis]. NSYSU; 2010. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907110-175213
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Oregon State University
7.
Morales, Fernando A.
Multiscale analysis of saturated flow in a porous medium with an adjacent thin channel.
Degree: PhD, Mathematics, 2011, Oregon State University
URL: http://hdl.handle.net/1957/21530
► This thesis contains three parts addressing the asymptotic analysis of fluid flow through fully saturated porous medium in the presence of an adjacent thin channel.…
(more)
▼ This thesis contains three parts addressing the asymptotic analysis of fluid flow through fully saturated
porous medium in the presence of an adjacent thin channel.
In the first part the problem is modeled by Darcy's law in both the
porous medium and in the channel. The permeability in the channel is scaled in order to balance the width of the channel with the high permeability in this region. The geometry of the channel is a region between a flat interface with the
porous medium and a curvy top. The problem is analyzed in direct variational formulation, and the solution obeys the minimization principle. A fully-coupled model with a lower dimensional interface problem is obtained in the limit as an approximation.
The second part models the problem by means of the same Darcy's law and scaling technique. The difference consists of the geometric possibilities of the channel, which is now limited by two parallel surfaces of smoothness C¹, and the formulation of the problem as a saddle point solution of a system of first order partial differential equations in mixed formulation. A limit problem of analogous structure and lower dimensional interface is obtained as an approximation.
In the third part the channel is modeled with Stokes law. Appropriate interface conditions are given to couple the Stokes' and Darcy's flow. The tangential velocity and the pressure exhibit a discontinuity across the interface. The limit problem is a Darcy-Brinkman system which has a structure different from that of the original one.
Advisors/Committee Members: Showalter, Ralph (advisor), Peszynska, Malgorzata (committee member).
Subjects/Keywords: Porous Media; Homogenization (Differential equations)
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APA (6th Edition):
Morales, F. A. (2011). Multiscale analysis of saturated flow in a porous medium with an adjacent thin channel. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/21530
Chicago Manual of Style (16th Edition):
Morales, Fernando A. “Multiscale analysis of saturated flow in a porous medium with an adjacent thin channel.” 2011. Doctoral Dissertation, Oregon State University. Accessed March 04, 2021.
http://hdl.handle.net/1957/21530.
MLA Handbook (7th Edition):
Morales, Fernando A. “Multiscale analysis of saturated flow in a porous medium with an adjacent thin channel.” 2011. Web. 04 Mar 2021.
Vancouver:
Morales FA. Multiscale analysis of saturated flow in a porous medium with an adjacent thin channel. [Internet] [Doctoral dissertation]. Oregon State University; 2011. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1957/21530.
Council of Science Editors:
Morales FA. Multiscale analysis of saturated flow in a porous medium with an adjacent thin channel. [Doctoral Dissertation]. Oregon State University; 2011. Available from: http://hdl.handle.net/1957/21530
8.
永井, 大資.
ナノ多孔構造半導体のフォノン特性.
Degree: 博士（工学）, 2017, Kyushu Institute of Technology / 九州工業大学
URL: http://hdl.handle.net/10228/4867
九州工業大学博士学位論文 学位記番号:生工博甲第153号 学位授与年月日:平成23年3月25日
第一章 序論|第二章 数値計算によるナノ多孔構造の熱輸送解析方法|第三章 ナノ多孔構造におけるフォノン特性の解析|第四章 ナノ多孔構造における熱整流効果|第五章 総括
平成22年度
Advisors/Committee Members: 宮崎, 康次.Subjects/Keywords: Heat Conduction; Porous Media; Phonon
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APA (6th Edition):
永井, . (2017). ナノ多孔構造半導体のフォノン特性. (Thesis). Kyushu Institute of Technology / 九州工業大学. Retrieved from http://hdl.handle.net/10228/4867
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
永井, 大資. “ナノ多孔構造半導体のフォノン特性.” 2017. Thesis, Kyushu Institute of Technology / 九州工業大学. Accessed March 04, 2021.
http://hdl.handle.net/10228/4867.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
永井, 大資. “ナノ多孔構造半導体のフォノン特性.” 2017. Web. 04 Mar 2021.
Vancouver:
永井 . ナノ多孔構造半導体のフォノン特性. [Internet] [Thesis]. Kyushu Institute of Technology / 九州工業大学; 2017. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10228/4867.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
永井 . ナノ多孔構造半導体のフォノン特性. [Thesis]. Kyushu Institute of Technology / 九州工業大学; 2017. Available from: http://hdl.handle.net/10228/4867
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Alberta
9.
Rostami Najafabadi, Zahra.
Rheological Behaviour of Heptane-Diluted Bitumen in the
Presence of Precipitates.
Degree: MS, Department of Chemical and Materials
Engineering, 2015, University of Alberta
URL: https://era.library.ualberta.ca/files/8910jx45p
► One of the challenges that Vapor Extraction process might be conducted is the unpredictable precipitation of asphaltene from solvent-diluted bitumen that can cause process problems…
(more)
▼ One of the challenges that Vapor Extraction process
might be conducted is the unpredictable precipitation of asphaltene
from solvent-diluted bitumen that can cause process problems during
bitumen extraction in porous media. The objective of this study was
to investigate the rheological behaviour of Athabasca bitumen and
n-heptane solutions in the present of precipitates using a
rheometer and flow through porous media. Rheometry measurements
shown for solutions have the viscosity higher than 0.001 Pa·s and
less than 0.0005 Pa·s, the phase angle is around 90° out of phase
and the solutions are purely viscous; while for the solutions
having the viscosity around 0.0007 Pa·s, the phase angle is around
84° out of phase and the solution behave as a non-Newtonian liquid.
Also, the flow of heptane-bitumen solutions through a porous media
experiments shows that for bitumen-heptane solution having
viscosity around 0.0007 Pa·s, after 24 hours mixing of the
solutions, the predicted and measured friction factor did not
agreed. This disagreement might be because of both decrease the
void area between the particles due to the presence of solids and
non-Newtonian behaviour of the solution, which is in consistent
with the rheology measurement results.
Subjects/Keywords: rheology, porous media, asphaltene
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APA (6th Edition):
Rostami Najafabadi, Z. (2015). Rheological Behaviour of Heptane-Diluted Bitumen in the
Presence of Precipitates. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/8910jx45p
Chicago Manual of Style (16th Edition):
Rostami Najafabadi, Zahra. “Rheological Behaviour of Heptane-Diluted Bitumen in the
Presence of Precipitates.” 2015. Masters Thesis, University of Alberta. Accessed March 04, 2021.
https://era.library.ualberta.ca/files/8910jx45p.
MLA Handbook (7th Edition):
Rostami Najafabadi, Zahra. “Rheological Behaviour of Heptane-Diluted Bitumen in the
Presence of Precipitates.” 2015. Web. 04 Mar 2021.
Vancouver:
Rostami Najafabadi Z. Rheological Behaviour of Heptane-Diluted Bitumen in the
Presence of Precipitates. [Internet] [Masters thesis]. University of Alberta; 2015. [cited 2021 Mar 04].
Available from: https://era.library.ualberta.ca/files/8910jx45p.
Council of Science Editors:
Rostami Najafabadi Z. Rheological Behaviour of Heptane-Diluted Bitumen in the
Presence of Precipitates. [Masters Thesis]. University of Alberta; 2015. Available from: https://era.library.ualberta.ca/files/8910jx45p
Texas A&M University
10.
Moon, Minam.
Generalized Discontinuous Multiscale Methods for Flows in Highly Heterogeneous Porous Media.
Degree: PhD, Mathematics, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/155430
► This dissertation is devoted to the development, study and testing of numerical methods for elliptic and parabolic equations with heterogeneous coefficients. The motivation for this…
(more)
▼ This dissertation is devoted to the development, study and testing of numerical methods for elliptic and parabolic equations with heterogeneous coefficients. The motivation for this study is to meet the need for fast and robust methods for numerical upscaling and simulation of single and multi-phase fluid flow in highly heterogeneous
porous media. We consider the multiscale model reduction technique in the framework of the discontinuous Galerkin (DG) and the hybridizable discontinuous Galerkin (HDG) finite element methods.
First, we design multiscale finite element methods for second order elliptic equations by applying the symmetric interior penalty discontinuous Galekin finite element method. We propose two different types of finite element spaces on the coarse mesh within DG framework. The first type of spaces is based on a local spectral problem that uses an interior weighted L²-norm and a boundary weighted L²-norm for computing the mass matrix. The second choice is based on generation of a snapshot space and subsequent selection of a subspace of a reduced dimension.
Second, we develop multiscale model reduction methods within the HDG framework. We provide construction of several multiscale finite element spaces (related to the coarse-mesh edges) that guarantee a reasonable approximation on a reduced dimensional space of the numerical traces. In these approaches, we use local snapshot spaces and local spectral decomposition following the concept of Generalized Multiscale Finite Element Methods. We also provide a general framework for systematic construction of multiscale spaces. By using local snapshots we were able to add local features to the solution space and to avoid high dimensional representation of trace spaces. Further, we extend multiscale finite element methods within HDG method to nonlinear and/or time-dependent problems. These extensions demonstrate the potential of the proposed constructions for some advanced and more practical applications.
For most of the proposed methods, we investigate their stability and derive error estimates for the approximate solutions. Furthermore we study the performance of all proposed methods on a representative number of numerical examples. In the numerical tests, we use various permeability data of highly heterogeneous
porous media and contrasts ranging from 10³ to 10
6. Since the exact solution is in general unknown, we first generate solutions on a very fine mesh and use them as reference solutions in our tests. The numerical results confirm the theoretical study of the accuracy of the proposed methods and their robustness with respect to the
media contrast. Our numerical experiments also show that the proposed methods could be implemented in a practical and efficient way.
Advisors/Committee Members: Lazarov, Raytcho (advisor), Efendiev, Yalchin (advisor), Popov, Bojan (committee member), Ragusa, Jean (committee member).
Subjects/Keywords: Porous media; multiscale method
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APA ·
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APA (6th Edition):
Moon, M. (2015). Generalized Discontinuous Multiscale Methods for Flows in Highly Heterogeneous Porous Media. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155430
Chicago Manual of Style (16th Edition):
Moon, Minam. “Generalized Discontinuous Multiscale Methods for Flows in Highly Heterogeneous Porous Media.” 2015. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/155430.
MLA Handbook (7th Edition):
Moon, Minam. “Generalized Discontinuous Multiscale Methods for Flows in Highly Heterogeneous Porous Media.” 2015. Web. 04 Mar 2021.
Vancouver:
Moon M. Generalized Discontinuous Multiscale Methods for Flows in Highly Heterogeneous Porous Media. [Internet] [Doctoral dissertation]. Texas A&M University; 2015. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/155430.
Council of Science Editors:
Moon M. Generalized Discontinuous Multiscale Methods for Flows in Highly Heterogeneous Porous Media. [Doctoral Dissertation]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155430
Texas A&M University
11.
Kang, Hyun Hee.
Machine Learning Implementation in Radiative Properties Prediction for Porous Media.
Degree: MS, Mechanical Engineering, 2019, Texas A&M University
URL: http://hdl.handle.net/1969.1/188755
► Predicting the radiative properties of porous media is highly important in many engineering applications (e.g. additive manufacturing). The radiative properties of packed beds highly depend…
(more)
▼ Predicting the radiative properties of
porous media is highly important in many engineering applications (e.g. additive manufacturing). The radiative properties of packed beds highly depend on the geometry and configuration of the structures and the types of materials. The conventional method of computing these properties is through Monte Carlo ray tracing (MCRT) simulations which yield statistical approximations through random sampling of light beams traversing in the
porous medium. In ray tracing, numerous light bundles are simulated traveling in random packed beds which are computationally structured via a discrete element model (DEM) of particle settlement simulation. The geometric complexity of
porous medium poses computational challenges in both ray tracing and DEM simulations. As a result, MCRT calculations are extremely time-consuming and difficult to setup/program. In this work, we demonstrate that machine learning (ML) techniques can be used to expedite the process of estimating the radiative properties of
porous media. ML methods are used in two ways to this aim: 1) As predicative models to directly estimate the radiative properties as functions of the medium geometry and configuration parameters. Specifically, we use neural networks (NN) to predict the radiative properties of the
media using supervised learning where the labeling data is collected using ray tracing.
The out-sample prediction can be carried out without the execution of MCRT simulations. We demonstrate that the trained NN models predict transmittivity of random packed beds with improved efficiency and preserved accuracy. 2) As characterization models to summarize and parameterize the statistical geometric properties of random beds which would lead to generation of surrogate penetration length distribution (PLD) functions. PLD is the distribution of probable extinction-free paths in the void between particles and is essential to MCRT simulations. Fast generation of surrogate PLDs essentially obviates the need for cumbersome DEM calculations thus leading to efficient approximate calculations of the radiative properties. ML techniques such as Gaussian Process (GP) modeling can be used for geometric characterization. Coupling ray tracing with the GP model transforms the randomness of the sphere packing into random light travel trajectories in the MCRT simulation. Without DEM simulations, The MCRT coupled with GP model accurately calculates radiative absorptivity.
Advisors/Committee Members: Hajimirza, Shima (advisor), Tsvetkov, Pavel V. (committee member), Pate, Michael B. (committee member).
Subjects/Keywords: Radiative heat transfer; Porous media
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APA ·
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APA (6th Edition):
Kang, H. H. (2019). Machine Learning Implementation in Radiative Properties Prediction for Porous Media. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/188755
Chicago Manual of Style (16th Edition):
Kang, Hyun Hee. “Machine Learning Implementation in Radiative Properties Prediction for Porous Media.” 2019. Masters Thesis, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/188755.
MLA Handbook (7th Edition):
Kang, Hyun Hee. “Machine Learning Implementation in Radiative Properties Prediction for Porous Media.” 2019. Web. 04 Mar 2021.
Vancouver:
Kang HH. Machine Learning Implementation in Radiative Properties Prediction for Porous Media. [Internet] [Masters thesis]. Texas A&M University; 2019. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/188755.
Council of Science Editors:
Kang HH. Machine Learning Implementation in Radiative Properties Prediction for Porous Media. [Masters Thesis]. Texas A&M University; 2019. Available from: http://hdl.handle.net/1969.1/188755
University of Waterloo
12.
Gerasik, Volodymyr.
Energy transport in saturated porous media.
Degree: 2011, University of Waterloo
URL: http://hdl.handle.net/10012/5885
► The energy analysis of the wave motion in the Lamb’s problem for a poroelastic half-space in the framework of Biot’s theory is presented. The results…
(more)
▼ The energy analysis of the wave motion in the Lamb’s problem for a poroelastic half-space in the framework of Biot’s theory is presented. The results for the energy velocity and quality factor of poroelastic waves are revisited. In the case of no dissipation the approach originally established for perfectly elastic
media by Miller & Pursey is generalized herein to include poroelastic waves. Special
cases of the resonant excitation of the Rayleigh wave and the absence of the Rayleigh
wave beyond the cut-off frequency are discussed in detail. Directional diagrams for the volumetric waves are presented. A quantitative picture of the energy partition among the traveling waves is provided for several driving configurations. In the general case of dissipative media the analysis is based on the semi-analytic solution of the Lamb’s problem. In the near field, the surface load generates three wavetrains corresponding to
the bulk modes. These wavetrains consist of waves which are longer and exhibit greater
viscous attenuation than the corresponding volumetric modes, so that, P1, P2 and S modes
emerge from the corresponding wavetrains at a certain distance from the source. For the far field, asymptotic expressions have been obtained and clearly indicate that it is only in the far field that the wave motion represents the superposition of the P1, P2, S and Rayleigh waves characterized by their corresponding wavelengths and attenuations. Moreover, these waves also exhibit geometric attenuation x3/2 (similar to the waves in a perfectly elastic half-space). To analyze the energy partition the total input power supplied by the source is decomposed into the contributions associated with the wavetrains and the Rayleigh wave.
These results provide the means for controlling the excitation of the various wave modes via changes to the driving configuration. Biot’s theory is a particular example of a non-conservative Lagrangian system with a Rayleigh dissipation function. The group velocities of poroelastic waves are complex and do not provide any information about the velocity of the energy transport. Moreover, in
general the precise physical meaning of the complex group velocity is unclear. The analysis based on the detailed study of the coupled system of the damped Klein-Gordon equations (Biot’s theory yields such a formalism in the low frequency limit) suggests that both precise and approximate physical interpretations of the complex group velocity are possible.
Moreover, these considerations further allow the derivation of exact closed form expressions for the energy velocity and Q factor for both longitudinal and shear poroelastic waves from energy principles. Most notably, the analysis of the resulting expressions reveals that the
energy velocity of both longitudinal and shear waves equals (exceeds) the corresponding phase velocity in the case of the low (full) frequency range Biot’s theory. The exact expression for the Q factor contains an additive correction due to viscoelastic interphase interaction in the higher…
Subjects/Keywords: porous media acoustics; Biot's theory
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APA (6th Edition):
Gerasik, V. (2011). Energy transport in saturated porous media. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/5885
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Gerasik, Volodymyr. “Energy transport in saturated porous media.” 2011. Thesis, University of Waterloo. Accessed March 04, 2021.
http://hdl.handle.net/10012/5885.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gerasik, Volodymyr. “Energy transport in saturated porous media.” 2011. Web. 04 Mar 2021.
Vancouver:
Gerasik V. Energy transport in saturated porous media. [Internet] [Thesis]. University of Waterloo; 2011. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10012/5885.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gerasik V. Energy transport in saturated porous media. [Thesis]. University of Waterloo; 2011. Available from: http://hdl.handle.net/10012/5885
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of North Texas
13.
Paudel, Laxmi P.
Traveling Wave Solutions of the Porous Medium Equation.
Degree: 2013, University of North Texas
URL: https://digital.library.unt.edu/ark:/67531/metadc271876/
► We prove the existence of a one-parameter family of solutions of the porous medium equation, a nonlinear heat equation. In our work, with space dimension…
(more)
▼ We prove the existence of a one-parameter family of solutions of the
porous medium equation, a nonlinear heat equation. In our work, with space dimension 3, the interface is a half line whose end point advances at constant speed. We prove, by using maximum principle, that the solutions are stable under a suitable class of perturbations. We discuss the relevance of our solutions, when restricted to two dimensions, to gravity driven flows of thin films. Here we extend the results of J. Iaia and S. Betelu in the paper "Solutions of the
porous medium equation with degenerate interfaces" to a higher dimension.
Advisors/Committee Members: Iaia, Joseph, Liu, Jianguo, Allaart, Pieter C..
Subjects/Keywords: Traveling wave; porous media; interface
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University of Texas – Austin
14.
Murphy, Michael Joseph, 1986-.
Experimental analysis of electrostatic and hydrodynamic forces affecting nanoparticle retention in porous media.
Degree: MSin Engineering, Petroleum Engineering, 2012, University of Texas – Austin
URL: http://hdl.handle.net/2152/ETD-UT-2012-05-5576
► There have been significant advances in the research of nanoparticle technologies for formation evaluation and reservoir engineering operations. The target applications require a variety of…
(more)
▼ There have been significant advances in the research of nanoparticle technologies for formation evaluation and reservoir engineering operations. The target applications require a variety of different retention characteristics ranging from nanoparticles that adsorb near the wellbore to nanoparticles that can travel significant distances within the
porous medium with little or no retention on the grain substrate. A detailed understanding of the underlying mechanisms that cause nanoparticle retention is necessary to design these applications. In this thesis, experiments were conducted to quantify nanoparticle retention in unconsolidated columns packed with crushed Boise sandstone and kaolinite clay. Experimental parameters such as flow rate, injected concentration and sandpack composition were varied in a controlled fashion to test hypotheses concerning retention mechanisms and enable development and validation of a mathematical model of nanoparticle transport. Results indicate nanoparticle retention, defined as the concentration of nanoparticles remaining attached to grains in the
porous medium after a volume of nanoparticle dispersion is injected through the medium and then displaced with brine, is a function of injected fluid velocity with higher injected velocities leading to lower retention. In many cases nanoparticle retention increased nonlinearly with increasing concentration of nanoparticles in the injected dispersion. Nanoparticle retention concentration was found to exhibit an upper bound beyond which no further adsorption from the nanoparticle dispersion to the grain substrate occurred. Kaolinite clay was shown to exhibit lower retention concentration [mg/m2] than Boise sandstone suggesting DLVO interactions do not significantly influence nanoparticle retention in high salinity dynamic flow environments.
Advisors/Committee Members: Bryant, Steven L. (advisor), Huh, Chun (committee member).
Subjects/Keywords: Nanoparticle retention; Porous media
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APA (6th Edition):
Murphy, Michael Joseph, 1. (2012). Experimental analysis of electrostatic and hydrodynamic forces affecting nanoparticle retention in porous media. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2012-05-5576
Chicago Manual of Style (16th Edition):
Murphy, Michael Joseph, 1986-. “Experimental analysis of electrostatic and hydrodynamic forces affecting nanoparticle retention in porous media.” 2012. Masters Thesis, University of Texas – Austin. Accessed March 04, 2021.
http://hdl.handle.net/2152/ETD-UT-2012-05-5576.
MLA Handbook (7th Edition):
Murphy, Michael Joseph, 1986-. “Experimental analysis of electrostatic and hydrodynamic forces affecting nanoparticle retention in porous media.” 2012. Web. 04 Mar 2021.
Vancouver:
Murphy, Michael Joseph 1. Experimental analysis of electrostatic and hydrodynamic forces affecting nanoparticle retention in porous media. [Internet] [Masters thesis]. University of Texas – Austin; 2012. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/2152/ETD-UT-2012-05-5576.
Council of Science Editors:
Murphy, Michael Joseph 1. Experimental analysis of electrostatic and hydrodynamic forces affecting nanoparticle retention in porous media. [Masters Thesis]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/ETD-UT-2012-05-5576
University of Oklahoma
15.
Adegbule, Aderonke.
The Effects of Evaporation and Capillary Forces on Fluid Motion, Solute Transport, and Water Content From the Grain Scale to the Continuum Scale in Unsaturated Porous Media.
Degree: PhD, 2019, University of Oklahoma
URL: http://hdl.handle.net/11244/321508
► This work aimed to explore how fluid motion, solute transport, and water content are influenced by evaporation and capillary forces in unsaturated porous media, across…
(more)
▼ This work aimed to explore how fluid motion, solute transport, and water content are influenced by evaporation and capillary forces in unsaturated
porous media, across a range of scales. Experiments were conducted from the grain scale to the continuum scale to explore a range of related flow phenomena.
The effect of solid surface roughness on precipitate formation has been widely studied for several years in different disciplines. However, few studies exist which studied precipitation on natural sand grains. In this study, the patterns of deposits formed on individual natural sand grain surfaces from solutions of sodium chloride and sucrose were studied. The patterns were studied using Scanning Electron Microscope (SEM) imaging and Energy Dispersive Spectroscopy (EDS). Results showed that as evaporation progressed, flow tended to occur towards the ridges, likely as a result of the discrepancy between the water configuration demanded by capillarity and the spatial distribution of evaporation. In the case of the sodium chloride solution, this led to sodium chloride precipitates being deposited on the ridges. For the sucrose solution, the outward flow was retarded by its viscosity at high concentrations. As a result, the sucrose was trapped in the valleys and precipitated there.
The impact of surface roughness on liquid wicking over a dry surface was also studied. While several studies exist on wicking on engineered surfaces, very few studies exist on wicking over natural surfaces. This study examined wicking patterns on dry individual sand grains. The roughness of the grains was studied using a combination of SEM imaging and edge detection to generate edge density maps. The wicking pattern was studied by taking regular images of the grain using an optical microscope. Sulforhodamine B dye was used in the water to make it easy to see the water on the sand grains. The results suggest that microporosity is required for rapid wicking. On grains which exhibited wicking, the liquid was wicked onto the rougher portion of the grain as shown by the edge density map. However, between grains, edge density maps alone are not sufficient to predict flow.
Finally, the effect of evaporation on capillary pressure-saturation (Pc-S) curves of two
porous media was studied. The
media were saturated and then allowed to drain. A test sample was exposed to evaporation after drainage while the control sample was not. Both samples were backlit, and images were taken at regular interval as the experiment progressed. The images were analyzed using a computer program which related light transmission to saturation. Results showed that evaporation lowered the drainage curve of both samples towards the imbibition curves. The rate of the lowering depended on the rate of evaporation experienced by the sample relative to the volume of the sample.
Advisors/Committee Members: Kibbey, Tohren (advisor), Harwell, Jeffrey (committee member), Kolar, Randall (committee member), Miller, Gerald (committee member), Sabatini, David (committee member).
Subjects/Keywords: Porous media; Evaporation; Precipitation; Wicking
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APA ·
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Export
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APA (6th Edition):
Adegbule, A. (2019). The Effects of Evaporation and Capillary Forces on Fluid Motion, Solute Transport, and Water Content From the Grain Scale to the Continuum Scale in Unsaturated Porous Media. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/321508
Chicago Manual of Style (16th Edition):
Adegbule, Aderonke. “The Effects of Evaporation and Capillary Forces on Fluid Motion, Solute Transport, and Water Content From the Grain Scale to the Continuum Scale in Unsaturated Porous Media.” 2019. Doctoral Dissertation, University of Oklahoma. Accessed March 04, 2021.
http://hdl.handle.net/11244/321508.
MLA Handbook (7th Edition):
Adegbule, Aderonke. “The Effects of Evaporation and Capillary Forces on Fluid Motion, Solute Transport, and Water Content From the Grain Scale to the Continuum Scale in Unsaturated Porous Media.” 2019. Web. 04 Mar 2021.
Vancouver:
Adegbule A. The Effects of Evaporation and Capillary Forces on Fluid Motion, Solute Transport, and Water Content From the Grain Scale to the Continuum Scale in Unsaturated Porous Media. [Internet] [Doctoral dissertation]. University of Oklahoma; 2019. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/11244/321508.
Council of Science Editors:
Adegbule A. The Effects of Evaporation and Capillary Forces on Fluid Motion, Solute Transport, and Water Content From the Grain Scale to the Continuum Scale in Unsaturated Porous Media. [Doctoral Dissertation]. University of Oklahoma; 2019. Available from: http://hdl.handle.net/11244/321508
Delft University of Technology
16.
Tamaro, Simone (author).
Numerical and Experimental Study of Airfoils with Porous Trailing Edge.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:21c1e156-c8df-4ab6-8630-25c6170d3bc6
► The addition of porous material to the trailing edge of airfoils was studied numerically and experimentally. The purpose of this work is to inspect whether…
(more)
▼ The addition of porous material to the trailing edge of airfoils was studied numerically and experimentally. The purpose of this work is to inspect whether the penalization method can be successfully used to describe flows through porous media. In the numerical study, the penalization method was applied to the incompressible Navier-Stokes equations. The flow has been studied with turbulent, unsteady simulations. The SIMPLE algorithm and a mixed scale model for LES were used in EllipSys2D. The code was validated with a test case on a flat plate. In this case, porous inserts are capable of suppressing vortex shedding by mitigating the pressure discontinuity at the trailing edge. An agreement with wind tunnel data could be observed both in the wake and in the boundary layer. The code was then applied to study a NACA0018 airfoil at zero angle of attack. In this case, porous materials reduce the energy content of turbulent signals in the wake. The power spectral density of pressure fluctuations in correspondence of the porous insert is reduced in the whole spectrum. The same airfoil was considered with the addition a single roughness element to trip the boundary layer at 20% of the chord. The height of the step was chosen from the results of a sensitivity analysis. The presence of the trip triggers turbulence transition successfully. Pressure drag for the porous case was found to be dependent on the presence of the trip. In the experimental study, measurements were taken on a symmetric NACA0018 airfoil at zero angle of attack. Hot-wire anemometry and surface microphones were used to measure the flow. Porous inserts with different permeabilities have been studied. Porous materials at the trailing edge increase the shear of velocity profiles in the boundary layer and reduce the power spectral density of pressure fluctuations in correspondence of the trailing edge. According to this study, the penalization method is a promising tool to study flows through porous media.
EWEM (European Wind Energy Masters)
European Wind Energy Masters (EWEM) ) | Rotor Design Track
Advisors/Committee Members: Ragni, Daniele (mentor), Avallone, Francesco (mentor), Shen, Wen Zhong (mentor), Delft University of Technology (degree granting institution), Technical University of Denmark (degree granting institution).
Subjects/Keywords: Porous Media; Aeroacoustics; CFD
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APA (6th Edition):
Tamaro, S. (. (2019). Numerical and Experimental Study of Airfoils with Porous Trailing Edge. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:21c1e156-c8df-4ab6-8630-25c6170d3bc6
Chicago Manual of Style (16th Edition):
Tamaro, Simone (author). “Numerical and Experimental Study of Airfoils with Porous Trailing Edge.” 2019. Masters Thesis, Delft University of Technology. Accessed March 04, 2021.
http://resolver.tudelft.nl/uuid:21c1e156-c8df-4ab6-8630-25c6170d3bc6.
MLA Handbook (7th Edition):
Tamaro, Simone (author). “Numerical and Experimental Study of Airfoils with Porous Trailing Edge.” 2019. Web. 04 Mar 2021.
Vancouver:
Tamaro S(. Numerical and Experimental Study of Airfoils with Porous Trailing Edge. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 04].
Available from: http://resolver.tudelft.nl/uuid:21c1e156-c8df-4ab6-8630-25c6170d3bc6.
Council of Science Editors:
Tamaro S(. Numerical and Experimental Study of Airfoils with Porous Trailing Edge. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:21c1e156-c8df-4ab6-8630-25c6170d3bc6
Indian Institute of Science
17.
Navneet Kumar, *.
Evaporation of Water from Soil-like, Leaf-like Surfaces and Unconventional Porous Media.
Degree: PhD, Faculty of Engineering, 2018, Indian Institute of Science
URL: http://etd.iisc.ac.in/handle/2005/3575
► Evaporation is one of the inherent processes of the earth’s ecosystem. Water bodies, earth’s surface and vegetation all contribute significantly towards the total evaporation which…
(more)
▼ Evaporation is one of the inherent processes of the earth’s ecosystem. Water bodies, earth’s surface and vegetation all contribute significantly towards the total evaporation which eventually leads to the formation of clouds. The factors which affect the total evaporation (evaporation & transpiration) are the surface temperature, ambient temperature, relative humidity, external wind speed, pressure, surface area and geometry.
This thesis deals with the contributors of total evaporation individually viz. open water bodies; soil-like surfaces; and leaf-like surfaces. A ceramic infrared heater has been used to mimic the heating due to sun’s radiation in all the experiments which were conducted in the quiescent atmosphere. This thesis has been broadly categorized into two parts: - (a) evaporation from bare water surface; and (b) evaporation from a
porous media. In part (a), we present experimental results on the evaporation from a bare water surface heated either from above using the infrared radiations or from below using immersed heaters. Heating from below leads to unstable stratification and convection while infrared heating from above leads to stable stratification. The effect of water-side convection on the evaporation from a bare water surface has been investigated and all the experimental results have been combined to obtain a power law relation between Sherwood number (Sh) and Rayleigh number (Ra). Part (b) of the thesis has been further split into three major categories: - (1) evaporation from spheres based conventional
porous media; (2) evaporation from unconventional
porous media containing rods, capillaries, and plates; and (3) evaporation from leaf-like surfaces. In all the experiments, a precision weighing balance was used to measure the evaporation rate. A thermal camera was used to get the surface temperature fields, and fluorescein dye mixed with water gave insightful results on the evaporation process. In particular the red deposits of fluorescein particles revealed the evaporation sites. In most of the experiments, the infrared heating was of the order of 1000W/m2. Different sized glass and acrylic containers were used in this thesis.
Mono-disperse glass beads (closest to mimic the natural soils), stainless steel balls, sieved natural sand and hydrophobic Ball Grid Array balls have been used to create the spheres-based conventional
porous media. Evaporation was found to undergo three stages which depended on the spheres size and the heat flux supplied. In the 1st stage of evaporation capillary film(s) pulls water from beneath the
porous media to the top surface and the evaporation rate remained high, close to that obtained from a water surface. Capillary break-up occurs in the transition regime which is followed by the 2nd stage of evaporation where a new vaporization plane is formed within the
porous media. In the 2nd stage, heat is conducted through the top dried layer to the water below where evaporation takes place and the evaporation rate drops drastically. Transition to 2nd stage happened…
Advisors/Committee Members: Arakeri, Jaywant H (advisor).
Subjects/Keywords: Evaporation; Soil-like Porous Media; Leaf-like Porous Media; Unconventional Porous Media; Evaporation of Water; Mechanical Engineering
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APA (6th Edition):
Navneet Kumar, *. (2018). Evaporation of Water from Soil-like, Leaf-like Surfaces and Unconventional Porous Media. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/3575
Chicago Manual of Style (16th Edition):
Navneet Kumar, *. “Evaporation of Water from Soil-like, Leaf-like Surfaces and Unconventional Porous Media.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed March 04, 2021.
http://etd.iisc.ac.in/handle/2005/3575.
MLA Handbook (7th Edition):
Navneet Kumar, *. “Evaporation of Water from Soil-like, Leaf-like Surfaces and Unconventional Porous Media.” 2018. Web. 04 Mar 2021.
Vancouver:
Navneet Kumar *. Evaporation of Water from Soil-like, Leaf-like Surfaces and Unconventional Porous Media. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Mar 04].
Available from: http://etd.iisc.ac.in/handle/2005/3575.
Council of Science Editors:
Navneet Kumar *. Evaporation of Water from Soil-like, Leaf-like Surfaces and Unconventional Porous Media. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/3575
University of Wisconsin – Milwaukee
18.
Faghihi Zarandi, Mohammad Amin.
Experimental, Theoretical and Numerical Evaluation of Wicking Models for Liquid Imbibition in Dry Porous Wicks.
Degree: PhD, Engineering, 2019, University of Wisconsin – Milwaukee
URL: https://dc.uwm.edu/etd/2302
► Nowadays commercial wicks are utilized by consumer product companies in several important commercial applications including Tiki® Brand torches, the passive lubricants of machine gears,…
(more)
▼ Nowadays commercial wicks are utilized by consumer product companies in several important commercial applications including Tiki® Brand torches, the passive lubricants of machine gears, propellant management device, and fragrance dispersion units. Spontaneous imbibition of a liquid into
porous wicks, also called wicking, is modeled using the single-phase Darcy’s law after assuming a sharp flow-front marked by full saturation behind the front. An analytical expression for the height of the wicking flow-front as a function of time is tested through comprehensive experiments using different wicks and an oil as the wicking liquid. We proposed a model based on sharp liquid-front where a good match with the experimental data was achieved. However, the proposed model based on the sharp liquid-front fails to account for partial saturation in the wicks. As a result, we applied the Richards equation to predict partial liquid saturations in wicks where the equation is solved numerically in 2-D using COMSOL and analytically in 1-D using Mathematica for glass-fiber wicks after treating them as transversely-isotropic
porous media. As a novel contribution, the relative permeability and capillary pressure are determined directly from pore-scale simulations in wick microstructure using the state-of-the-art software GeoDict. The saturation along the wick length is determined experimentally through a new liquid-N2 based freezing technique. After including the gravity effect, good agreements between the numerical/analytical predictions and experimental results are achieved in saturation distributions. We also validated the Richards equation-based model while predicting absorbed liquid-mass into the wick as a function of time. A series of wicking experiments with wicks procured from our industrial partners were conducted where the use of a dyed liquid revealed essentially three types of macroscopic (visual) fronts—sharp, semi-sharp, and diffuse. The particulate wicks (i.e. the wicks formed by sintering polymer beads) invariably formed sharp fronts, while the fibrous wicks (i.e. wicks formed from fibers) formed either semi-sharp or diffuse fronts. The porosity was also found to play a role—the lower-porosity fibrous wicks displayed semi-sharp fronts, while the higher-porosity fibrous wicks caused the fronts to be diffuse. A study of SEM (Scanning Electron Microscopy) micrographs revealed that the latter behavior was caused by clustering of fibers thus leading to the formation of an inhomogeneous
porous medium (perhaps promoting finger formation on micro-fronts). The experiments also revealed that the visually-observed fronts, for most parts, achieved a good match with the fronts estimated through the sharp-front mass gain formula. (Such a match was found to be lacking in the fibrous wicks displaying diffuse fronts.) We also investigated two parameters of interest to the users of wicks: 1) steady-state (SS) height reached by the visual front at very large times, 2) the liquid supply rate when the front is near the top. The…
Advisors/Committee Members: Krishna M Pillai.
Subjects/Keywords: Imbibition; Permeability; Porous Media; Porous Wick; Saturation; Wicking; Mechanical Engineering
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APA (6th Edition):
Faghihi Zarandi, M. A. (2019). Experimental, Theoretical and Numerical Evaluation of Wicking Models for Liquid Imbibition in Dry Porous Wicks. (Doctoral Dissertation). University of Wisconsin – Milwaukee. Retrieved from https://dc.uwm.edu/etd/2302
Chicago Manual of Style (16th Edition):
Faghihi Zarandi, Mohammad Amin. “Experimental, Theoretical and Numerical Evaluation of Wicking Models for Liquid Imbibition in Dry Porous Wicks.” 2019. Doctoral Dissertation, University of Wisconsin – Milwaukee. Accessed March 04, 2021.
https://dc.uwm.edu/etd/2302.
MLA Handbook (7th Edition):
Faghihi Zarandi, Mohammad Amin. “Experimental, Theoretical and Numerical Evaluation of Wicking Models for Liquid Imbibition in Dry Porous Wicks.” 2019. Web. 04 Mar 2021.
Vancouver:
Faghihi Zarandi MA. Experimental, Theoretical and Numerical Evaluation of Wicking Models for Liquid Imbibition in Dry Porous Wicks. [Internet] [Doctoral dissertation]. University of Wisconsin – Milwaukee; 2019. [cited 2021 Mar 04].
Available from: https://dc.uwm.edu/etd/2302.
Council of Science Editors:
Faghihi Zarandi MA. Experimental, Theoretical and Numerical Evaluation of Wicking Models for Liquid Imbibition in Dry Porous Wicks. [Doctoral Dissertation]. University of Wisconsin – Milwaukee; 2019. Available from: https://dc.uwm.edu/etd/2302
19.
Li, Tianyi.
Linking Pore-scale Fluid-Fluid Interfacial Curvature in Porous Media to Capillary Pressure and Local Morphology with A Novel Method for Curvature Measurement.
Degree: MS, Environmental Engineering, 2015, Oregon State University
URL: http://hdl.handle.net/1957/56361
► Systems that contain multi-phase flow in porous media are of interest in diverse fields including environmental engineering, hydrogeology, and petroleum engineering etc. One of the…
(more)
▼ Systems that contain multi-phase flow in
porous media are of interest in diverse fields including environmental engineering, hydrogeology, and petroleum engineering etc. One of the main descriptors of multi-phase flow in
porous media is the relationship between capillary pressure and fluid saturation. Capillary pressure is inherently a pore-scale variable and is generally measured externally by a pressure transducer. As an alternative, it has recently become possible to estimate capillary pressure from images by using curvature values using the Young-Laplace equation. X-ray microtomography is the general platform to perform three dimensional imaging, and for producing measurements such as interfacial curvatures. To improve such curvature measurement, different image processing scenarios were tested and a novel curvature estimation method was developed. Results revealed that errors on the curvature estimates have been significantly reduced for both synthetic data and real data sets. Because curvature-based capillary pressure for disconnected non-wetting blobs differs from transducer-based capillary pressure due to residual oil blobs experience less hysteresis as well as the influence of local pore morphology, connected fluid and disconnected fluid were considered separately.
Advisors/Committee Members: Wildenschild, Dorthe (advisor), Semprini, Lewis (committee member).
Subjects/Keywords: Porous media; Porous materials
…58
6.16. Interface Simulation in Porous Media… …38
1
Linking Pore-scale Fluid-Fluid Interfacial Curvature in Porous Media to Capillary… …Systems containing multi-phase flow in porous media are of interest in many different
fields… …flow in porous media has significant potential to
help us solve some of these issues… …Understanding the movement and physical properties
of multi-phase fluids in porous media has…
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APA (6th Edition):
Li, T. (2015). Linking Pore-scale Fluid-Fluid Interfacial Curvature in Porous Media to Capillary Pressure and Local Morphology with A Novel Method for Curvature Measurement. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/56361
Chicago Manual of Style (16th Edition):
Li, Tianyi. “Linking Pore-scale Fluid-Fluid Interfacial Curvature in Porous Media to Capillary Pressure and Local Morphology with A Novel Method for Curvature Measurement.” 2015. Masters Thesis, Oregon State University. Accessed March 04, 2021.
http://hdl.handle.net/1957/56361.
MLA Handbook (7th Edition):
Li, Tianyi. “Linking Pore-scale Fluid-Fluid Interfacial Curvature in Porous Media to Capillary Pressure and Local Morphology with A Novel Method for Curvature Measurement.” 2015. Web. 04 Mar 2021.
Vancouver:
Li T. Linking Pore-scale Fluid-Fluid Interfacial Curvature in Porous Media to Capillary Pressure and Local Morphology with A Novel Method for Curvature Measurement. [Internet] [Masters thesis]. Oregon State University; 2015. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1957/56361.
Council of Science Editors:
Li T. Linking Pore-scale Fluid-Fluid Interfacial Curvature in Porous Media to Capillary Pressure and Local Morphology with A Novel Method for Curvature Measurement. [Masters Thesis]. Oregon State University; 2015. Available from: http://hdl.handle.net/1957/56361
University of Adelaide
20.
Afsharvahid, Shahrooz.
Nitrogen oxides reduction in a porous burner.
Degree: 2016, University of Adelaide
URL: http://hdl.handle.net/2440/105979
► Different aspects of porous burners have been studied in the past in terms of the bed material, design, heat transfer modes and flame characteristics. However,…
(more)
▼ Different aspects of
porous burners have been studied in the past in terms of the bed material, design, heat transfer modes and flame characteristics. However, the application of
porous burners to NOx reduction and the effect of the bed surface on the chemical reactions have not yet been explored. Hence, the objective of this study is to investigate the effect of the design and operating parameters on NOx reduction inside a
porous burner. To achieve this objective, a variety of flames, stabilised inside
porous burners, were investigated experimentally, utilizing thermocouples, gas sampling and chromatography. Numerical tools were also used to understand the chemical pathways under different operating conditions better. Premixed CNG-air and LPG-air flames at very low equivalence ratios were stabilised inside the
porous bed. The relationship between the volumetric flow rate of the mixture and the minimum equivalence ratio was studied (experimentally and numerically) for equivalence ratios as low as φ=0.35 (equivalent to thermal power of 2kW). The maximum temperature observed to be consistent with super-adiabatic flame temperatures. The maximum measured NOX and CO mole fractions at the burner exit were found to be in the order of few PPMs. The conversion of NOx was then assessed. A mixture of CNG-air doped with NO was introduced into the burner inlet and the effects of the operating parameters on NOx reduction were assessed. It was found that NOx reduction is a function of the equivalence ratio, total flow rate and NO mole fraction at the inlet. Higher flow rates led to an increase in the conversion rate at higher equivalence ratios, due to shorter residence times, and the greater need for more flame radicals in the flame. The numerical study revealed that different chemical pathways dominate at different equivalence ratios, which led to the production of other intermediates and stable radicals. The study showed that the Total Fixed Nitrogen, TFN, reduction followed a similar trend to the NOx reduction for moderately fuel-rich conditions (φ ≤ 1.2) and opposite trends for higher equivalence ratios. For φ>1.2, most of the NO is converted to N-containing species such as N₂O, NH₃ and HCN and not to N₂. Analysis of the chemical pathways showed that the formation of nitrogen-containing species under very fuel rich conditions is due to the increased importance of the HCNO path, as compared with the HNO path. The best TFN conversion efficiency, 65%, was found at φ=1.1. Intermediate radicals have different rates of destruction and production on the
porous bed surface, especially for mixtures close to stoichiometric conditions. Under these conditions, the conversion of NOX is strongly influenced by the concentration of H radicals. A collision probability of η = 8 x 10⁻⁴ was found to represent this radical loss effect and to help predict the destruction and production of intermediate terminals with a good level of accuracy. This study also found that NOx reductions using
porous burners are technically feasible and that the…
Advisors/Committee Members: Dally, Bassam B. (advisor), School of Mechanical Engineering (school).
Subjects/Keywords: NOx reduction; porous burners; surface reaction; porous media
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APA (6th Edition):
Afsharvahid, S. (2016). Nitrogen oxides reduction in a porous burner. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/105979
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Afsharvahid, Shahrooz. “Nitrogen oxides reduction in a porous burner.” 2016. Thesis, University of Adelaide. Accessed March 04, 2021.
http://hdl.handle.net/2440/105979.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Afsharvahid, Shahrooz. “Nitrogen oxides reduction in a porous burner.” 2016. Web. 04 Mar 2021.
Vancouver:
Afsharvahid S. Nitrogen oxides reduction in a porous burner. [Internet] [Thesis]. University of Adelaide; 2016. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/2440/105979.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Afsharvahid S. Nitrogen oxides reduction in a porous burner. [Thesis]. University of Adelaide; 2016. Available from: http://hdl.handle.net/2440/105979
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Alberta
21.
Valiei, Amin.
Biofilm Streamer Formation in a Porous Microfluidic
Device.
Degree: MS, Department of Chemical and Materials
Engineering, 2012, University of Alberta
URL: https://era.library.ualberta.ca/files/cc08hh041
► Biofilm formation in porous media is of significant importance in many environmental and industrial processes such as bioremediation, oil recovery, and wastewater treatment. In the…
(more)
▼ Biofilm formation in porous media is of significant
importance in many environmental and industrial processes such as
bioremediation, oil recovery, and wastewater treatment. In the
present study, we fabricated a porous media mimic inside a
microfluidic device to observe the growth of bacteria in a porous
environment. Here, we report the formation of filamentous
structures between the porous structures which are known as
streamers. Streamers are made from Polymeric Substance (EPS) and
are tethered at one or both ends to a surface, while the rest of
the structure floats in the aqueous media. We studied evolution of
streamers in different flow rates and identified a tangible link
between hydrodynamic conditions and development of these
filamentous structures. Our results show that hydrodynamic
conditions not only play a key role in determining the formation
and stability of the streamers, but also influence their morphology
and distribution. These observations, which reveal salient features
of biofilm formation in porous media, could open up new avenues for
understanding biofilm dynamics in complex natural
conditions.
Subjects/Keywords: Microfluidic Devices; Porous Media; Biofilm Streamers
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APA (6th Edition):
Valiei, A. (2012). Biofilm Streamer Formation in a Porous Microfluidic
Device. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/cc08hh041
Chicago Manual of Style (16th Edition):
Valiei, Amin. “Biofilm Streamer Formation in a Porous Microfluidic
Device.” 2012. Masters Thesis, University of Alberta. Accessed March 04, 2021.
https://era.library.ualberta.ca/files/cc08hh041.
MLA Handbook (7th Edition):
Valiei, Amin. “Biofilm Streamer Formation in a Porous Microfluidic
Device.” 2012. Web. 04 Mar 2021.
Vancouver:
Valiei A. Biofilm Streamer Formation in a Porous Microfluidic
Device. [Internet] [Masters thesis]. University of Alberta; 2012. [cited 2021 Mar 04].
Available from: https://era.library.ualberta.ca/files/cc08hh041.
Council of Science Editors:
Valiei A. Biofilm Streamer Formation in a Porous Microfluidic
Device. [Masters Thesis]. University of Alberta; 2012. Available from: https://era.library.ualberta.ca/files/cc08hh041
Universiteit Utrecht
22.
Hoogland, F.
Evaporation rates from square capillaries limited by corner flow viscous losses.
Degree: 2012, Universiteit Utrecht
URL: http://dspace.library.uu.nl:8080/handle/1874/252898
► Evaporation is an important process in water exchange between soil and atmosphere as well as applications in industry. Predictions of drying rates from porous media…
(more)
▼ Evaporation is an important process in water exchange between soil and atmosphere as well as applications in industry. Predictions of drying rates from
porous media are very difficult due to its highly non-linear behavior with typically high and fairly constant drying rates in the beginning followed by a drop to low rates. The high drying rates at the first stage of drying are attributed to the presence of liquid patches retained in corners of the partially air filled pore space that are interconnected to form conductive pathways. Under increasingly dryer circumstances these liquid connections break leading to the diffusion dominated low drying rates of the second stage. The maximum extent of this corner flow region that determines the duration of the first stage is controlled by capillary forces opposed by gravity and viscous losses. To quantify these mechanisms, evaporation is studied from a single glass capillary with square cross section. Such geometry shows similar drying curve characteristics as macro-scale
porous media with high rates as long as thick capillary sustained corner films extent between the receding meniscus and capillary surface. Increased flow resistance and gravity force as drying proceeds lead to film break-up at certain characteristic meniscus depth LC. LC was studied experimentally for drying of liquids ethanol and water from different capillary sizes under a range of evaporation rates and capillary inclination angles. This way the forces determining the extent of the corner films were changed systematically. Break-up of films as well as evolution of main meniscus depth were monitored to deduce LC and drying rates. For ethanol initial evaporation rates were in the order of 1000 mm/day and dropped abruptly when the corner films broke up. Increasing the evaporation rate led to a shortening of the films, whereas with decreasing gravity component the films became significantly longer. Maximum corner film extent for water was much shorter and mainly limited by corner geometry due to its high contact angle of 30°. Model predictions on LC based on force balance and corner flow equations gave good results that were in accordance with the experimental data. The roundedness of the capillary corners had a large influence on maximum film length by limiting the curvature of the liquid interface at the capillary surface. This roundedness represents a critical pore size in real
porous media that determines the maximum extent of the corner film region.
Advisors/Committee Members: Or, Dani, Lehmann, Peter, Hassanizadeh, Majid.
Subjects/Keywords: Geowetenschappen; evaporation, porous media, capillary, angular, hydrology
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APA (6th Edition):
Hoogland, F. (2012). Evaporation rates from square capillaries limited by corner flow viscous losses. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/252898
Chicago Manual of Style (16th Edition):
Hoogland, F. “Evaporation rates from square capillaries limited by corner flow viscous losses.” 2012. Masters Thesis, Universiteit Utrecht. Accessed March 04, 2021.
http://dspace.library.uu.nl:8080/handle/1874/252898.
MLA Handbook (7th Edition):
Hoogland, F. “Evaporation rates from square capillaries limited by corner flow viscous losses.” 2012. Web. 04 Mar 2021.
Vancouver:
Hoogland F. Evaporation rates from square capillaries limited by corner flow viscous losses. [Internet] [Masters thesis]. Universiteit Utrecht; 2012. [cited 2021 Mar 04].
Available from: http://dspace.library.uu.nl:8080/handle/1874/252898.
Council of Science Editors:
Hoogland F. Evaporation rates from square capillaries limited by corner flow viscous losses. [Masters Thesis]. Universiteit Utrecht; 2012. Available from: http://dspace.library.uu.nl:8080/handle/1874/252898
University of Alberta
23.
Joseph,Jerry.
Quantification of transport properties in microfluidic
porous media.
Degree: MS, Department of Mechanical Engineering, 2012, University of Alberta
URL: https://era.library.ualberta.ca/files/rx913r186
► Quantification of transport properties at pore scale is important for efficient oil extraction, improving fuel cell performance etc. An experimental methodology is developed for calculating…
(more)
▼ Quantification of transport properties at pore scale
is important for efficient oil extraction, improving fuel cell
performance etc. An experimental methodology is developed for
calculating permeability and porosity in microfluidic devices that
contain structured and unstructured porous media. First, fluid flow
experiments are conducted in micro channels with integrated
micropillars (MCIPs) that mimic structured porous media and the
obtained results are compared with available theoretical
predictions. It is also found that the resistance to flow is higher
in square arrangement of micropillars than in stag- gered
arrangement. Second, experiments are conducted in micro channels
containing realistic reservoir pore networks etched in silicon.
Analogous to real reservoirs, it is found that the permeability
increases with porosity and the flow resistance decreases with
increase in Darcy number. Finally, a Monte Carlo based simulation
technique is provided for determination of effective gas
diffusivity by using realistic images of such unstructured porous
media.
Subjects/Keywords: permeability; Porous media; microfluidics; porosity; pressure drop
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APA (6th Edition):
Joseph,Jerry. (2012). Quantification of transport properties in microfluidic
porous media. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/rx913r186
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
Joseph,Jerry. “Quantification of transport properties in microfluidic
porous media.” 2012. Masters Thesis, University of Alberta. Accessed March 04, 2021.
https://era.library.ualberta.ca/files/rx913r186.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
Joseph,Jerry. “Quantification of transport properties in microfluidic
porous media.” 2012. Web. 04 Mar 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
Joseph,Jerry. Quantification of transport properties in microfluidic
porous media. [Internet] [Masters thesis]. University of Alberta; 2012. [cited 2021 Mar 04].
Available from: https://era.library.ualberta.ca/files/rx913r186.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
Joseph,Jerry. Quantification of transport properties in microfluidic
porous media. [Masters Thesis]. University of Alberta; 2012. Available from: https://era.library.ualberta.ca/files/rx913r186
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Kyoto University / 京都大学
24.
GHIMIRE, BIDUR.
HYDRAULIC ANALYSIS OF FREE-SURFACE FLOWS INTO HIGHLY PERMEABLE POROUS MEDIA AND ITS APPLICATIONS : 高浸透能多孔質媒体中への開水路流れの水理解析法とその応用に関する研究.
Degree: 博士(工学), 2009, Kyoto University / 京都大学
URL: http://hdl.handle.net/2433/85382
;
http://dx.doi.org/10.14989/doctor.k14916
► In this study, a comprehensive approach including mathematical, numerical and experimental study has been taken in order to develop new models for describing free surface…
(more)
▼ In this study, a comprehensive approach including mathematical, numerical and experimental study has been taken in order to develop new models for describing free surface flow behavior in porous media. The study suggested that modeling free-surface flow in porous media is possible using a single equation capable of showing proper transition between inertial and classical Darcian flow, based on the similarity distribution functions of depth and velocity. The developed integral model inherits both the flow regimes as depicted in the analysis. For both laminar and turbulent flows through porous media, the integral models give satisfactory results. Also the proposed algorithm for numerical simulation is capable of solving various problems of free-surface flow through porous media. This study adds a new dimension to fluid flow in porous media by replacing Darcy's equation with new models that are capable of representing both Darcy and non-Darcy flow behaviors. These are new nonlinear ordinary differential equations inherited both the flow regimes investigated. Integral formulations for unsteady depth distribution, velocity and front speed under constant water level and constant flux discharge inlet conditions have been developed based on similarity law. The formulations presented provide additional analytical insight about the intrusion dynamics. It is pointed out that, based on the self-similarity analysis, the temporal intrusion processes can be categorized into the inertia-pressure (IP) and the pressure-drag (PD) regimes. The early inertia-pressure regime is followed by the pressure-drag regime. In addition, the integral models proposed can be successfully used for the solution of a host of other nonlinear problems that admit self-similarity. The analytical and numerical solutions for constant inlet water level condition are verified with experimental observations. The unsteady distributions of flow depth, inflow velocity and front speeds are compared for various porous media characterized by its corresponding porosity and permeability. Analyses indicate that the integral models clearly represent the nonlinear flow behavior in porous media both in laminar and turbulent flow conditions. The integral model results are in agreement with those obtained by similarity solution for the temporal change of velocity, depth at inlet and front positions. The thesis also presents a computational fluid dynamics (CFD) model developed for the analysis of unsteady free-surface flows through porous media. Vertical two-dimensional numerical simulations are carried out for the free-surface flow inside the porous media governed by a set of Navier-Stokes equations extended for porous media flow. This model includes the convective and local inertia terms along with viscous diffusion term and resistance term comprising Darcy's linear resistance and Forchheimer's inertial resistance terms. The Finite volume method is applied using constrained interpolated propagation (CIP) method and highly simplified marker and cell (HSMAC) type pressure…
Subjects/Keywords: Hydraulics; Porous Media; Groundwater; Infiltration; Numerical Simulation
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APA (6th Edition):
GHIMIRE, B. (2009). HYDRAULIC ANALYSIS OF FREE-SURFACE FLOWS INTO HIGHLY PERMEABLE POROUS MEDIA AND ITS APPLICATIONS : 高浸透能多孔質媒体中への開水路流れの水理解析法とその応用に関する研究. (Thesis). Kyoto University / 京都大学. Retrieved from http://hdl.handle.net/2433/85382 ; http://dx.doi.org/10.14989/doctor.k14916
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
GHIMIRE, BIDUR. “HYDRAULIC ANALYSIS OF FREE-SURFACE FLOWS INTO HIGHLY PERMEABLE POROUS MEDIA AND ITS APPLICATIONS : 高浸透能多孔質媒体中への開水路流れの水理解析法とその応用に関する研究.” 2009. Thesis, Kyoto University / 京都大学. Accessed March 04, 2021.
http://hdl.handle.net/2433/85382 ; http://dx.doi.org/10.14989/doctor.k14916.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
GHIMIRE, BIDUR. “HYDRAULIC ANALYSIS OF FREE-SURFACE FLOWS INTO HIGHLY PERMEABLE POROUS MEDIA AND ITS APPLICATIONS : 高浸透能多孔質媒体中への開水路流れの水理解析法とその応用に関する研究.” 2009. Web. 04 Mar 2021.
Vancouver:
GHIMIRE B. HYDRAULIC ANALYSIS OF FREE-SURFACE FLOWS INTO HIGHLY PERMEABLE POROUS MEDIA AND ITS APPLICATIONS : 高浸透能多孔質媒体中への開水路流れの水理解析法とその応用に関する研究. [Internet] [Thesis]. Kyoto University / 京都大学; 2009. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/2433/85382 ; http://dx.doi.org/10.14989/doctor.k14916.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
GHIMIRE B. HYDRAULIC ANALYSIS OF FREE-SURFACE FLOWS INTO HIGHLY PERMEABLE POROUS MEDIA AND ITS APPLICATIONS : 高浸透能多孔質媒体中への開水路流れの水理解析法とその応用に関する研究. [Thesis]. Kyoto University / 京都大学; 2009. Available from: http://hdl.handle.net/2433/85382 ; http://dx.doi.org/10.14989/doctor.k14916
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Cornell University
25.
Subramanian, Sasikrishnan.
Nanoparticle Transport Through Fractures And Heterogeneous Porous Media.
Degree: M.S., Geological Sciences, Geological Sciences, 2012, Cornell University
URL: http://hdl.handle.net/1813/31488
► Nanoparticles have a diffusion constant a couple of orders of magnitude smaller than inert chemical tracers such as potassium bromide (KBr), and this means that…
(more)
▼ Nanoparticles have a diffusion constant a couple of orders of magnitude smaller than inert chemical tracers such as potassium bromide (KBr), and this means that they can potentially be used to measure the degree to which subsurface flow occurs through fractures and high permeable zones in heterogeneous
porous media. Using carbon based 2-5 nm particles (C-Dots); we inject dual tracers at different flow rates into a permeable core channel (fracture). The KBr tracer has time to diffuse into the surrounding halo much more than the particle tracer and arrives much later in the effluent. We carry out this kind of experiment in laboratory apparatus with different geometry (Hele-Shaw fracture cell, Rectangular and Cylindrical Beadpack columns). The Interpretation required models that take into account the flow in the halo as well as the core and, which also include dispersion. All experiments could be interpreted in a consistent fashion. The success suggests that it may be possible to assess the extent of fracture-controlled flow in the subsurface by combining non-sticking nanoparticles with an inert chemical tracer.
Advisors/Committee Members: Cathles, Lawrence M (chair), Archer, Lynden A. (committee member).
Subjects/Keywords: nanoparticle transport; heterogeneous porous media; fluid bypass
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APA (6th Edition):
Subramanian, S. (2012). Nanoparticle Transport Through Fractures And Heterogeneous Porous Media. (Masters Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/31488
Chicago Manual of Style (16th Edition):
Subramanian, Sasikrishnan. “Nanoparticle Transport Through Fractures And Heterogeneous Porous Media.” 2012. Masters Thesis, Cornell University. Accessed March 04, 2021.
http://hdl.handle.net/1813/31488.
MLA Handbook (7th Edition):
Subramanian, Sasikrishnan. “Nanoparticle Transport Through Fractures And Heterogeneous Porous Media.” 2012. Web. 04 Mar 2021.
Vancouver:
Subramanian S. Nanoparticle Transport Through Fractures And Heterogeneous Porous Media. [Internet] [Masters thesis]. Cornell University; 2012. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1813/31488.
Council of Science Editors:
Subramanian S. Nanoparticle Transport Through Fractures And Heterogeneous Porous Media. [Masters Thesis]. Cornell University; 2012. Available from: http://hdl.handle.net/1813/31488
Cornell University
26.
Xu, Jin.
Internal Processes Of Sand And Other Porous Media.
Degree: PhD, Mechanical Engineering, 2015, Cornell University
URL: http://hdl.handle.net/1813/40659
► This dissertation discusses internal processes of porous media from multiple perspectives. In chapter 2, "Statistical Mechanics of Unsaturated Porous Media," we derive a statistical mechanical…
(more)
▼ This dissertation discusses internal processes of
porous media from multiple perspectives. In chapter 2, "Statistical Mechanics of Unsaturated
Porous Media," we derive a statistical mechanical model of fluid retention characteristics in
porous media in terms of known surface energies and void geometry within the permeable solid based on the Ising model from magnetism. In the limit of vanishing inertial and viscous forces, the theory predicts the fuid retention curve that relates saturation of the
porous matrix to applied capillary pressure. We show how the fluid retention curve can be calculated from the statistical distribution of two dimensionless parameters measuring, respectively, the areas of link cross-section and wetted cavity surface with respect to cavity volume. The theory attributes hysteresis of the retention curve to collective first-order phase transitions in the network of cavities. Furthermore, we illustrate predictions with a
porous domain consisting of a random packing of spheres, and reproduce the behavior of Haines jumps, which we associate with phase transitions. Chapters 3 and 4 features experimental studies of a particular type of particulate
porous media - sand and explores the internal processes of sand dunes and their surface ripples. Chapter 3, "Temperature and Humidity within a Mobile Barchan Sand Dune," (co-authored with A. Valance, A. Ould el-Moctar, A. G. Hay and R. Richer), attempts at answering a practical question of potential importance to dune stabilization, whether temperature and moisture deep within relatively fast moving hyperarid mobile dunes present a suitable habitat for microbes. We contrast deep thermal records obtained from implanted probes with measurements of diurnal variations of the temperature profile just below the surface, and show that temperature within fast moving dunes is predictable, as long as dune advection is properly considered. Observations and analyses also suggest that small quantities of rain falling on the leeward face escape evaporation and endure within the dune until resurfacing upwind. At depths below 10 cm, we show that moisture, rather than temperature, determines the viability of microbes. Toward elucidating how a wavy
porous sand bed perturbs a turbulent flow above its surface, in Chapter 4, "Pore Pressure in a Wind-swept Rippled Bed," (co-authored with R. A. Musa, S. Takarrouht, and M. E. Berberich), we record and model pressure within a permeable material resembling the region just below desert ripples. We discovered that, unlike flows on impermeable waves, the
porous rippled bed diffuses the depression upstream, reduces surface pressure gradients, and gives rise to a slip velocity, thus affecting the turbulent boundary layer. Pressure gradients within the
porous material also generate body forces rising with wind speed squared and ripple aspect ratio, partially counteracting gravity around crests, thereby facilitating the onset of erosion. Although these three essays differ in method and focus, they are all address the internal processes…
Advisors/Committee Members: Louge,Michel Yves (chair), Stroock,Abraham Duncan (committee member), Desjardins,Olivier (committee member).
Subjects/Keywords: statistical mechanics; porous media; transport processes
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APA (6th Edition):
Xu, J. (2015). Internal Processes Of Sand And Other Porous Media. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/40659
Chicago Manual of Style (16th Edition):
Xu, Jin. “Internal Processes Of Sand And Other Porous Media.” 2015. Doctoral Dissertation, Cornell University. Accessed March 04, 2021.
http://hdl.handle.net/1813/40659.
MLA Handbook (7th Edition):
Xu, Jin. “Internal Processes Of Sand And Other Porous Media.” 2015. Web. 04 Mar 2021.
Vancouver:
Xu J. Internal Processes Of Sand And Other Porous Media. [Internet] [Doctoral dissertation]. Cornell University; 2015. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1813/40659.
Council of Science Editors:
Xu J. Internal Processes Of Sand And Other Porous Media. [Doctoral Dissertation]. Cornell University; 2015. Available from: http://hdl.handle.net/1813/40659
27.
Raja Rani, T.
Convection in porous media with surface temperature
variations, variable fluid properties, magnetic field, radiation
and stratification; -.
Degree: Mathematics, 2010, Acharya Nagarjuna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/8053
Subjects/Keywords: Porous Media; mathematics
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Raja Rani, T. (2010). Convection in porous media with surface temperature
variations, variable fluid properties, magnetic field, radiation
and stratification; -. (Thesis). Acharya Nagarjuna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/8053
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Raja Rani, T. “Convection in porous media with surface temperature
variations, variable fluid properties, magnetic field, radiation
and stratification; -.” 2010. Thesis, Acharya Nagarjuna University. Accessed March 04, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/8053.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Raja Rani, T. “Convection in porous media with surface temperature
variations, variable fluid properties, magnetic field, radiation
and stratification; -.” 2010. Web. 04 Mar 2021.
Vancouver:
Raja Rani T. Convection in porous media with surface temperature
variations, variable fluid properties, magnetic field, radiation
and stratification; -. [Internet] [Thesis]. Acharya Nagarjuna University; 2010. [cited 2021 Mar 04].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/8053.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Raja Rani T. Convection in porous media with surface temperature
variations, variable fluid properties, magnetic field, radiation
and stratification; -. [Thesis]. Acharya Nagarjuna University; 2010. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/8053
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
28.
Cheng, Zhigang.
Thermodynamic Properties of Helium in Porous Media.
Degree: 2013, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/17507
► The first credible experimental hint of non-classical rotational inertia (NCRI) or supersolidity was reported in 2004 in a torsional oscillator experiment of solid 4He confined…
(more)
▼ The first credible experimental hint of non-classical rotational inertia (NCRI) or supersolidity was reported in 2004 in a torsional oscillator experiment of solid 4He confined in Vycor. Since then numerous studies on the possible novel state have been carried out. While it was shown very recently that the observed drop in the resonant period of the torsional oscillators housing solid helium which was interpreted as a signature of NCRI is more likely a mechanical phenomenon other than a real phase transition, a number of interesting properties of solid 4He have been observed during the last decade in many laboratories. These newly discovered results include a shear modulus anomaly, dc flow through solid helium and a heat capacity peak. Most of these studies focus on bulk crystalline solid 4He. This dissertation focuses on the study of thermodynamic properties of helium in
porous media.
We have measured the heat capacity of solid 4He grown in aerogel and Vycor. For solid 4He in aerogel, the dependences of heat capacity on pressure and 3He concentration have been systematically studied. We found evidence that 3He atoms tend to reside in the vicinity of silica strands as temperature is decreased forming a 3He rich region.
We have also carried out measurements of thermal conductivity of solid 4He embedded in Vycor. The thermal conductivity of Vycor is not significantly changed with the infusion of solid helium. Interestingly, the infusion of liquid 4He in Vycor pores results in a three-fold reduction in thermal conductivity below 0.5 K. The introduction of superfluid 4He films and liquid 3He into the Vycor pores also results in the reduction of thermal conductivity. We propose a model suggesting the origin of the reduction is the presence of hydrodynamic slow sound modes in liquid 4He, as well as in superfluid 4He films and liquid 3He. The slow sound modes facilitate the quantum tunneling of two-level systems (TLS) in silica and dramatically increase the TLS-phonon scattering. The more modest reduction in solid helium-Vycor composite is caused by the presence of phonon excitations in solid helium which also facilitate TLS tunneling in silica.
Advisors/Committee Members: Moses Hung Wai Chan, Dissertation Advisor/Co-Advisor, Jainendra Jain, Committee Member, Thomas E Mallouk, Committee Member, Julian Decatur Maynard Jr., Committee Member, Jorge Osvaldo Sofo, Committee Member.
Subjects/Keywords: helium; heat capacity; thermal conductivity; porous media
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APA (6th Edition):
Cheng, Z. (2013). Thermodynamic Properties of Helium in Porous Media. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/17507
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Cheng, Zhigang. “Thermodynamic Properties of Helium in Porous Media.” 2013. Thesis, Penn State University. Accessed March 04, 2021.
https://submit-etda.libraries.psu.edu/catalog/17507.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cheng, Zhigang. “Thermodynamic Properties of Helium in Porous Media.” 2013. Web. 04 Mar 2021.
Vancouver:
Cheng Z. Thermodynamic Properties of Helium in Porous Media. [Internet] [Thesis]. Penn State University; 2013. [cited 2021 Mar 04].
Available from: https://submit-etda.libraries.psu.edu/catalog/17507.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cheng Z. Thermodynamic Properties of Helium in Porous Media. [Thesis]. Penn State University; 2013. Available from: https://submit-etda.libraries.psu.edu/catalog/17507
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
29.
Deng, Lichi.
Theoretical Investigation of Immiscible Multiphase Flow Mechanisms in Porous Media with Capillarity.
Degree: PhD, Petroleum Engineering, 2019, Texas A&M University
URL: http://hdl.handle.net/1969.1/187156
► The correct description of multiphase flow mechanism in porous media is an important aspect of research in fluid mechanics, water resources and petroleum engineering. The…
(more)
▼ The correct description of multiphase flow mechanism in
porous media is an important aspect of research in fluid mechanics, water resources and petroleum engineering. The thorough understanding of these mechanisms is important for many applications such as waterflood, CO2 sequestration, and enhanced oil recovery. Being different from single phase flow that is well described by Darcy’s law and well understood for over 160 years, the multiphase flow mechanism requires more mathematical involvement with more complex fluid interaction which inevitably will incorporate relative permeability and capillary pressure into its description.
For typical two-phase flow problems, especially at the conventional reservoir scale, the Buckley-Leverett flow equations are normally applied with negligible capillarity to capture the flow behavior. However, as we extend our studies to higher resolution using multiscale calculations, or evaluate tighter or higher contrast heterogeneous reservoirs, capillarity becomes increasingly important. Also, for situations such as spontaneous imbibition that wetting fluid is displaced by non-wetting invading fluid, it is possible that capillary force becomes the dominating driving force with negligible viscous and gravity contributions. To better characterize the multiphase flow mechanism with capillarity, in this research, a detailed investigation is carried out in pursuit of more rigorous mathematical description and broader applicability.
The numerical simulation analysis of the described problem has long been a
subject of interest with numerous publications addressing it. Being different from the traditional methods where numerical simulation is used, we pursue the analytical description of the flow behavior using Lagrangian approach which is better in describing these frontal propagation problems. Also, the analytical solution tends to give more insight into the underlying physical characteristics of the problem itself. As one of the most important outcomes, the methodology derives a new dimensionless capillary group that characterizes the relative strength of capillarity at the continuum scale based on the analytical solution. Knowledge of this can be used for stability analyses, with future potential application in the design of computational grids to properly resolve the capillary physics.
Advisors/Committee Members: King, Michael J (advisor), Datta-Gupta, Akhil (committee member), Gildin, Eduardo (committee member), Donovan, Art (committee member).
Subjects/Keywords: Multiphase Flow; Porous Media; Immiscible; Capillarity
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Deng, L. (2019). Theoretical Investigation of Immiscible Multiphase Flow Mechanisms in Porous Media with Capillarity. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/187156
Chicago Manual of Style (16th Edition):
Deng, Lichi. “Theoretical Investigation of Immiscible Multiphase Flow Mechanisms in Porous Media with Capillarity.” 2019. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/187156.
MLA Handbook (7th Edition):
Deng, Lichi. “Theoretical Investigation of Immiscible Multiphase Flow Mechanisms in Porous Media with Capillarity.” 2019. Web. 04 Mar 2021.
Vancouver:
Deng L. Theoretical Investigation of Immiscible Multiphase Flow Mechanisms in Porous Media with Capillarity. [Internet] [Doctoral dissertation]. Texas A&M University; 2019. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/187156.
Council of Science Editors:
Deng L. Theoretical Investigation of Immiscible Multiphase Flow Mechanisms in Porous Media with Capillarity. [Doctoral Dissertation]. Texas A&M University; 2019. Available from: http://hdl.handle.net/1969.1/187156
University of Houston
30.
He, Kai 1985-.
Understanding the Transport of Nanoparticles in Microchannel based Model Porous Media.
Degree: PhD, Chemical Engineering, 2013, University of Houston
URL: http://hdl.handle.net/10657/3284
► Recently, nanoparticle dispersions have been explored to improve the exploration and production of sub-surface hydrocarbons. To address that effort it is critical to fundamentally understand…
(more)
▼ Recently, nanoparticle dispersions have been explored to improve the exploration and production of sub-surface hydrocarbons. To address that effort it is critical to fundamentally understand the dynamics and transport of nanoparticles in
porous media. Natural
porous media are heterogeneous in confinement, connectivity and surface chemistry resulting in different physical mechanisms for transport. Thus, understanding the dynamics and transport of nanoparticles in model
porous media is important.
In this work, an effective methodology for improved understanding of diffusion and transport mechanisms of nanoparticles in model
porous media has been developed, using a combination of nanofabrication and optical microscopy based techniques - differential dynamics microscopy (DDM) and single particle tracking (SPT). First, the diffusive dynamics of 100 nm to 400 nm diameter polystyrene nanoparticles dispersed in water were examined using DDM. The diffusion coefficients measured by DDM were in excellent agreement with those measured by dynamic light scattering, indicating that DDM is a valid tool to investigate the dynamics of nanoparticles.
Next, the confinement effect on the diffusive dynamics of nanoparticles was investigated using DDM and SPT. Arrays of nanoposts of diameter 500 nm and spacing ranging from 0.4 to 10 m were fabricated to confine 200-400 nm diameter nanoparticles. Two effects of confinement imposed by the cylindrical posts were found: slowing diffusive dynamics of nanoparticles and inducing emergence of multiple relaxation times and further modifying the relaxation process. Results also showed that under modest confinement nanoparticles remained diffusive; while under extreme confinement diffusion became anomalous.
Finally, transport of nanoparticles through model
porous media was probed using SPT. Microchannels with cylindrical post arrays of post spacing ranging from 0.8 to 2 m were fabricated, nanoparticles were then injected into the microchannel with Re <0.004 and Pex ranging from 2.2 to 58.9. Results suggest that shapes of nanoparticle trajectories are strongly dependent on the Pex. It was also found that confinement not only slowed the diffusive dynamics but also the convective flow. Importantly, a geometrical dependence of the ratio of longitudinal dispersion DL to transverse dispersion Dm was found, which provide a first microscopic view of the transport of nanoparticles in complex geometries.
Advisors/Committee Members: Krishnamoorti, Ramanan (advisor), Balakotaiah, Vemuri (committee member), Conrad, Jacinta C. (committee member), Sharma, Pradeep (committee member), Vipulanandan, Cumaraswamy (committee member).
Subjects/Keywords: Nanoparticles; Diffusion; Transport; Nanofabrication; Model porous media
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
He, K. 1. (2013). Understanding the Transport of Nanoparticles in Microchannel based Model Porous Media. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/3284
Chicago Manual of Style (16th Edition):
He, Kai 1985-. “Understanding the Transport of Nanoparticles in Microchannel based Model Porous Media.” 2013. Doctoral Dissertation, University of Houston. Accessed March 04, 2021.
http://hdl.handle.net/10657/3284.
MLA Handbook (7th Edition):
He, Kai 1985-. “Understanding the Transport of Nanoparticles in Microchannel based Model Porous Media.” 2013. Web. 04 Mar 2021.
Vancouver:
He K1. Understanding the Transport of Nanoparticles in Microchannel based Model Porous Media. [Internet] [Doctoral dissertation]. University of Houston; 2013. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10657/3284.
Council of Science Editors:
He K1. Understanding the Transport of Nanoparticles in Microchannel based Model Porous Media. [Doctoral Dissertation]. University of Houston; 2013. Available from: http://hdl.handle.net/10657/3284
◁ [1] [2] [3] [4] [5] … [32] ▶
. 
Open Access Theses and Dissertations
