subject:(porous media)

1. 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 (6^th 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 (16^th Edition):

Srinivasan, Shriram. “Modelling Flow through Porous Media under Large Pressure Gradients.” 2013. Thesis, Texas Digital Library. Accessed February 17, 2020. 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 (7^th Edition):

Srinivasan, Shriram. “Modelling Flow through Porous Media under Large Pressure Gradients.” 2013. Web. 17 Feb 2020.

Vancouver:

Srinivasan S. Modelling Flow through Porous Media under Large Pressure Gradients. [Internet] [Thesis]. Texas Digital Library; 2013. [cited 2020 Feb 17]. 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

Tulane University

2. 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 (6^th 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 (16^th Edition):

Ezeh, Chike. “NOVEL IDEAS FOR ENHANCED OIL RECOVERY AND OIL SPILL REMEDIATION IN POROUS MEDIA.” 2019. Thesis, Tulane University. Accessed February 17, 2020. 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 (7^th Edition):

Ezeh, Chike. “NOVEL IDEAS FOR ENHANCED OIL RECOVERY AND OIL SPILL REMEDIATION IN POROUS MEDIA.” 2019. Web. 17 Feb 2020.

Vancouver:

Ezeh C. NOVEL IDEAS FOR ENHANCED OIL RECOVERY AND OIL SPILL REMEDIATION IN POROUS MEDIA. [Internet] [Thesis]. Tulane University; 2019. [cited 2020 Feb 17]. 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

University of Oxford

3. 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)

Subjects/Keywords: deformable porous media; Porous materials

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APA (6^th 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 (16^th Edition):

Auton, Lucy. “Large fluid-driven deformations of porous annuli : solutions via Chebyshev spectral collocation.” 2018. Doctoral Dissertation, University of Oxford. Accessed February 17, 2020. 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 (7^th Edition):

Auton, Lucy. “Large fluid-driven deformations of porous annuli : solutions via Chebyshev spectral collocation.” 2018. Web. 17 Feb 2020.

Vancouver:

Auton L. Large fluid-driven deformations of porous annuli : solutions via Chebyshev spectral collocation. [Internet] [Doctoral dissertation]. University of Oxford; 2018. [cited 2020 Feb 17]. 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

University of Alberta

4. 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)

Subjects/Keywords: rheology, porous media, asphaltene

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APA (6^th 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 (16^th Edition):

Rostami Najafabadi, Zahra. “Rheological Behaviour of Heptane-Diluted Bitumen in the Presence of Precipitates.” 2015. Masters Thesis, University of Alberta. Accessed February 17, 2020. https://era.library.ualberta.ca/files/8910jx45p.

MLA Handbook (7^th Edition):

Rostami Najafabadi, Zahra. “Rheological Behaviour of Heptane-Diluted Bitumen in the Presence of Precipitates.” 2015. Web. 17 Feb 2020.

Vancouver:

Rostami Najafabadi Z. Rheological Behaviour of Heptane-Diluted Bitumen in the Presence of Precipitates. [Internet] [Masters thesis]. University of Alberta; 2015. [cited 2020 Feb 17]. 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

5. Moon, Minam. Generalized Discontinuous Multiscale Methods for Flows in Highly Heterogeneous Porous Media.

Degree: 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 L?-norm and a boundary weighted L?-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 10? to 10⁶. 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 (6^th Edition):

Moon, M. (2015). Generalized Discontinuous Multiscale Methods for Flows in Highly Heterogeneous Porous Media. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155430

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Moon, Minam. “Generalized Discontinuous Multiscale Methods for Flows in Highly Heterogeneous Porous Media.” 2015. Thesis, Texas A&M University. Accessed February 17, 2020. http://hdl.handle.net/1969.1/155430.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Moon, Minam. “Generalized Discontinuous Multiscale Methods for Flows in Highly Heterogeneous Porous Media.” 2015. Web. 17 Feb 2020.

Vancouver:

Moon M. Generalized Discontinuous Multiscale Methods for Flows in Highly Heterogeneous Porous Media. [Internet] [Thesis]. Texas A&M University; 2015. [cited 2020 Feb 17]. Available from: http://hdl.handle.net/1969.1/155430.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Moon M. Generalized Discontinuous Multiscale Methods for Flows in Highly Heterogeneous Porous Media. [Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155430

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

6. 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)

Subjects/Keywords: permeable structure; porous media

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APA (6^th 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 (16^th Edition):

Huang, Pei-chi. “Study on Wave Field with Multiple Porous Layers.” 2010. Thesis, NSYSU. Accessed February 17, 2020. 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 (7^th Edition):

Huang, Pei-chi. “Study on Wave Field with Multiple Porous Layers.” 2010. Web. 17 Feb 2020.

Vancouver:

Huang P. Study on Wave Field with Multiple Porous Layers. [Internet] [Thesis]. NSYSU; 2010. [cited 2020 Feb 17]. 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

7. 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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APA (6^th 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 (16^th Edition):

Chou, Chun-ting. “Study on Wave Field with Caisson on Multiple Porous Layers.” 2010. Thesis, NSYSU. Accessed February 17, 2020. 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 (7^th Edition):

Chou, Chun-ting. “Study on Wave Field with Caisson on Multiple Porous Layers.” 2010. Web. 17 Feb 2020.

Vancouver:

Chou C. Study on Wave Field with Caisson on Multiple Porous Layers. [Internet] [Thesis]. NSYSU; 2010. [cited 2020 Feb 17]. 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

8. 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)

Subjects/Keywords: Porous Media; Homogenization (Differential equations)

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APA (6^th 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 (16^th 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 February 17, 2020. http://hdl.handle.net/1957/21530.

MLA Handbook (7^th Edition):

Morales, Fernando A. “Multiscale analysis of saturated flow in a porous medium with an adjacent thin channel.” 2011. Web. 17 Feb 2020.

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 2020 Feb 17]. 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

9. 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 (6^th 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 (16^th 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 February 17, 2020. 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 (7^th Edition):

永井, 大資. “ナノ多孔構造半導体のフォノン特性.” 2017. Web. 17 Feb 2020.

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 2020 Feb 17]. 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 Waterloo

10. Zendehboudi, Sohrab. Investigation of Gravity Drainage in Fractured Porous Media.

Degree: 2010, University of Waterloo

URL: http://hdl.handle.net/10012/5586

► The oil production from well fractured carbonate reservoirs is a considerable part of the total oil production in the world. The petroleum resource base in… (more)

▼ The oil production from well fractured carbonate reservoirs is a considerable part of the total oil production in the world. The petroleum resource base in naturally fractured reservoirs is estimated to be in the range of billions of barrels in the U.S and in addition, a multibillion- barrel international oil resource base exists in naturally fractured reservoirs. Gravity drainage is important in some of oil recovery processes, either acting as the driving force in processes using horizontal wells or altering the displacement patterns during water-flooding, chemical flooding, CO2 flooding and other EOR methods. The gravity drainage process has a major effect on oil recovery from oil reservoirs. Gravity drainage driven oil production in naturally fractured and other complex reservoirs falls into two regimes: the balk flow regime and the film flow regime. Oil recovery by gravity drainage in a fractured reservoir strongly depends on the capillary height of the porous medium. Capillarity and gravity forces are usually the major driving forces in fractured reservoirs. This PhD thesis consists of two main parts namely: 1) Experimental works on gravity drainage, and 2) Modeling and simulation of the gravity drainage processes using COMSOL® software. An appropriate design of experiment (DOE) method was selected to find the most important parameters contributing in gravity drainage and then conduct the experiments in a useful as well as economic manner. A two-dimensional experimental setup was employed to investigate free fall gravity drainage (FFGD) and controlled gravity drainage (CGD) using unconsolidated glass beads fractured porous media having various fractures configurations. Flow visualization measurements were carried out. Following the flow visualization experiments, parametric sensitivity analysis was performed considering the effects of different system parameters such as fracture aperture, matrix height, permeability, and fluid properties on the dependent variables including drainage rate, critical pumping rate, maximum drainage rate, recovery factor and so on. These experiments enabled us to capture some aspects of the recovery mechanism and the flow communication between matrix block and fracture during gravity drainage. After analyzing the experimental data for the FFGD test runs, it was found that the rate of liquid flowing from matrix to fracture is proportional to the difference of liquid levels in the matrix and in the fracture. In addition, the characteristic rate and the maximum liquid drainage rate from the fractured models were determined for such a stable gravity-dominated process. The experiments showed that the presence of fracture is more influential in lower matrix permeability systems. For a given fracture-matrix system with different initial liquid saturation conditions, it was seen that the production history can be correlated by plotting the fraction of recoverable liquid as a function of time. Furthermore, the recovery factor can be correlated using dimensionless…

Subjects/Keywords: Gravity Drainage; Fractured Porous Media

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APA (6^th Edition):

Zendehboudi, S. (2010). Investigation of Gravity Drainage in Fractured Porous Media. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/5586

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zendehboudi, Sohrab. “Investigation of Gravity Drainage in Fractured Porous Media.” 2010. Thesis, University of Waterloo. Accessed February 17, 2020. http://hdl.handle.net/10012/5586.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zendehboudi, Sohrab. “Investigation of Gravity Drainage in Fractured Porous Media.” 2010. Web. 17 Feb 2020.

Vancouver:

Zendehboudi S. Investigation of Gravity Drainage in Fractured Porous Media. [Internet] [Thesis]. University of Waterloo; 2010. [cited 2020 Feb 17]. Available from: http://hdl.handle.net/10012/5586.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zendehboudi S. Investigation of Gravity Drainage in Fractured Porous Media. [Thesis]. University of Waterloo; 2010. Available from: http://hdl.handle.net/10012/5586

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Waterloo

11. 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 (6^th 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 (16^th Edition):

Gerasik, Volodymyr. “Energy transport in saturated porous media.” 2011. Thesis, University of Waterloo. Accessed February 17, 2020. 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 (7^th Edition):

Gerasik, Volodymyr. “Energy transport in saturated porous media.” 2011. Web. 17 Feb 2020.

Vancouver:

Gerasik V. Energy transport in saturated porous media. [Internet] [Thesis]. University of Waterloo; 2011. [cited 2020 Feb 17]. 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

12. 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)

Subjects/Keywords: Traveling wave; porous media; interface

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APA (6^th Edition):

Paudel, L. P. (2013). Traveling Wave Solutions of the Porous Medium Equation. (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc271876/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Paudel, Laxmi P. “Traveling Wave Solutions of the Porous Medium Equation.” 2013. Thesis, University of North Texas. Accessed February 17, 2020. https://digital.library.unt.edu/ark:/67531/metadc271876/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Paudel, Laxmi P. “Traveling Wave Solutions of the Porous Medium Equation.” 2013. Web. 17 Feb 2020.

Vancouver:

Paudel LP. Traveling Wave Solutions of the Porous Medium Equation. [Internet] [Thesis]. University of North Texas; 2013. [cited 2020 Feb 17]. Available from: https://digital.library.unt.edu/ark:/67531/metadc271876/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Paudel LP. Traveling Wave Solutions of the Porous Medium Equation. [Thesis]. University of North Texas; 2013. Available from: https://digital.library.unt.edu/ark:/67531/metadc271876/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Oklahoma

13. 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 · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th 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 February 17, 2020. http://hdl.handle.net/11244/321508.

MLA Handbook (7^th 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. 17 Feb 2020.

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 2020 Feb 17]. 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

University of Manchester

14. Al-Aabidy, Qahtan. Modelling of turbulent flow and heat transfer in porous media for gas turbine blade cooling.

Degree: PhD, 2018, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/modelling-of-turbulent-flow-and-heat-transfer-in-porous-media-for-gas-turbine-blade-cooling(f7781d8e-bb1e-4bb7-a57e-4e77875ad6d6).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740417

► This thesis focuses on the study of flow and heat transfer in porous media in both laminar and turbulent flow regimes, by using Volume Averaged… (more)

▼ This thesis focuses on the study of flow and heat transfer in porous media in both laminar and turbulent flow regimes, by using Volume Averaged Reynolds Navier Stokes (VARNS) approach. The main concern is to investigate the possibility of using porous media for the gas turbine blade cooling. Very recently, using this technique in blade cooling, particularly with internal cooling, has motivated many researchers due to an effective enhancement in the blade cooling. In this study turbulence is represented by using the Launder-Sharma low-Reynolds-number k-Îμ turbulence model, which is modified via proposals by Nakayama and Kuwahara (2008) and Pedras and de Lemos (2001) for extra source terms in the turbulent transport equations to account for the porous structure, which is treated as rigid and isotropic. Due to the changing of the effective porosity as the clear fluid region is approached, the porosity and additional source term in the macroscopic Reynolds averaged Navier-Stokes equations are relaxed across a thin transitional layer at the edges of the porous media. This is achieved by utilizing exponential damping relations to consider these changes. The Local Thermal Equilibrium (LTE) (one-energy equation) model is used for the thermal analysis in porous media. In order to investigate the validity of the extended model, laminar and turbulent flow in different cases, fully developed and developing flows, have been considered. For laminar flows, fully developed plane channel flows with one and two porous layers, a channel with a single porous block and partially filled porous channel flows have been examined for the purpose of validating the extra drag terms in the momentum equations. For the validation purpose for turbulent flows in porous media, the extended model has been tested in homogeneous porous media, turbulent porous channel flows, turbulent solid/porous rib channel flows, and repeated turbulent porous baffled channel flows. Results of all laminar cases show excellent qualitative agreements with the available numerical calculations and experimental data. Results of all turbulent cases show that the extended model returns generally satisfactory accuracy through the comparisons with the available data, except for some predictive weaknesses in regions of either impingement or adverse pressure gradients, both of which are largely due the underlying eddy-viscosity model formulation employed. Thus, from all results, it can be confirmed that the extended model is promising for engineering applications.

Subjects/Keywords: fluid-porous interface; gas turbine blade cooling; turbulence modelling in porous media; porous ribs

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APA (6^th Edition):

Al-Aabidy, Q. (2018). Modelling of turbulent flow and heat transfer in porous media for gas turbine blade cooling. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/modelling-of-turbulent-flow-and-heat-transfer-in-porous-media-for-gas-turbine-blade-cooling(f7781d8e-bb1e-4bb7-a57e-4e77875ad6d6).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740417

Chicago Manual of Style (16^th Edition):

Al-Aabidy, Qahtan. “Modelling of turbulent flow and heat transfer in porous media for gas turbine blade cooling.” 2018. Doctoral Dissertation, University of Manchester. Accessed February 17, 2020. https://www.research.manchester.ac.uk/portal/en/theses/modelling-of-turbulent-flow-and-heat-transfer-in-porous-media-for-gas-turbine-blade-cooling(f7781d8e-bb1e-4bb7-a57e-4e77875ad6d6).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740417.

MLA Handbook (7^th Edition):

Al-Aabidy, Qahtan. “Modelling of turbulent flow and heat transfer in porous media for gas turbine blade cooling.” 2018. Web. 17 Feb 2020.

Vancouver:

Al-Aabidy Q. Modelling of turbulent flow and heat transfer in porous media for gas turbine blade cooling. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2020 Feb 17]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/modelling-of-turbulent-flow-and-heat-transfer-in-porous-media-for-gas-turbine-blade-cooling(f7781d8e-bb1e-4bb7-a57e-4e77875ad6d6).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740417.

Council of Science Editors:

Al-Aabidy Q. Modelling of turbulent flow and heat transfer in porous media for gas turbine blade cooling. [Doctoral Dissertation]. University of Manchester; 2018. Available from: https://www.research.manchester.ac.uk/portal/en/theses/modelling-of-turbulent-flow-and-heat-transfer-in-porous-media-for-gas-turbine-blade-cooling(f7781d8e-bb1e-4bb7-a57e-4e77875ad6d6).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740417

Indian Institute of Science

15. Navneet Kumar, *. Evaporation of Water from Soil-like, Leaf-like Surfaces and Unconventional Porous Media.

Degree: 2016, Indian Institute of Science

URL: http://etd.iisc.ernet.in/2005/3575 ; http://etd.iisc.ernet.in/abstracts/4387/Abstract_Thesis.pdf

►

RBCCPS

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… (more)

▼

RBCCPS

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…

Advisors/Committee Members: Arakeri, Jaywant H.

Subjects/Keywords: Evaporation; Soil-like Porous Media; Leaf-like Porous Media; Unconventional Porous Media; Evaporation of Water; Mechanical Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Navneet Kumar, *. (2016). Evaporation of Water from Soil-like, Leaf-like Surfaces and Unconventional Porous Media. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/2005/3575 ; http://etd.iisc.ernet.in/abstracts/4387/Abstract_Thesis.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Navneet Kumar, *. “Evaporation of Water from Soil-like, Leaf-like Surfaces and Unconventional Porous Media.” 2016. Thesis, Indian Institute of Science. Accessed February 17, 2020. http://etd.iisc.ernet.in/2005/3575 ; http://etd.iisc.ernet.in/abstracts/4387/Abstract_Thesis.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Navneet Kumar, *. “Evaporation of Water from Soil-like, Leaf-like Surfaces and Unconventional Porous Media.” 2016. Web. 17 Feb 2020.

Vancouver:

Navneet Kumar *. Evaporation of Water from Soil-like, Leaf-like Surfaces and Unconventional Porous Media. [Internet] [Thesis]. Indian Institute of Science; 2016. [cited 2020 Feb 17]. Available from: http://etd.iisc.ernet.in/2005/3575 ; http://etd.iisc.ernet.in/abstracts/4387/Abstract_Thesis.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Navneet Kumar *. Evaporation of Water from Soil-like, Leaf-like Surfaces and Unconventional Porous Media. [Thesis]. Indian Institute of Science; 2016. Available from: http://etd.iisc.ernet.in/2005/3575 ; http://etd.iisc.ernet.in/abstracts/4387/Abstract_Thesis.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Minnesota

16. Bagchi, Aniruddha. Natural convection in horizontal fluid-superposed porous layers heated locally from below.

Degree: PhD, Mechanical Engineering, 2010, University of Minnesota

URL: http://purl.umn.edu/99290

► Natural convection in a horizontal fluid-superposed porous layer heated locally from below is studied in this thesis. This problem occurs in numerous engineering and geophysical… (more)

▼ Natural convection in a horizontal fluid-superposed porous layer heated locally from below is studied in this thesis. This problem occurs in numerous engineering and geophysical systems, such as fibrous and granular thermal insulations, water reservoirs, grain storage installations, solid-matrix heat exchangers, solidifying castings, and post-accident cooling of nuclear reactors. In nature, thermal circulation in lakes, shallow coastal areas and other reservoirs occurs in a system having a fluid layer superposed on top of a porous matrix that is heated locally at the base. In spite of its fundamental nature, there are virtually no studies in the literature pertaining to this problem. To address this shortcoming, the fundamental aspects of this problem are studied in this work. The goal of the thesis is to study how free convective heat transfer in a composite layer with a localized bottom heat source is affected by parameters such as the size of the heat source, the fluid-to-porous layer height ratio, the Darcy number, the aspect ratio, the solid-to-fluid conductivity ratio, and the fluid Prandtl number. To that end, two particular aspects of the problem are studied: (a) the steady-state and transient flow and temperature fields, and (b) measurement and prediction of the overall heat transfer characteristics of the system. A numerical approach has been used to study the development of the temperature and flow fields in the system and predict overall heat transfer rates. A one-domain formulation, which uses a single set of governing equations to model fluid flow and heat transfer throughout the entire composite domain, is used. To solve the governing equations, a control volume based numerical solution technique is used. Results show that the nature of convective motion in a composite system with a localized bottom heat source is identical to that observed when the base is uniformly heated. A cellular flow pattern is observed with flow penetration occurring from the overlying fluid layer to the underlying porous layer. Penetration, however, is significant only near the fluid-porous layer interface. The overall heat transfer coefficients are found to depend strongly on the heater length, height ratio, and the fluid-to-porous layer conductivity ratio, while the effects of the aspect ratio and the fluid Prandtl number are not very significant. The effect of the Darcy number is moderate up to Darcy numbers of 10^-3 beyond which there is a sudden increase in heat transfer coefficients Experiments are performed to validate the numerical solutions and develop empirical Nusselt-versus-Rayleigh number correlations. Experiments are conducted in a cubical chamber with 3 mm DIA glass beads as the porous layer and distilled water as the saturating fluid. Two different heater lengths and three different height ratios are investigated. Experimental results confirm the numerical predictions that the Nusselt number increases with a decrease in the heater length and an increase in the height ratio. However,…

Subjects/Keywords: Fluid-superposed porous layer; Natural Convection; Porous Media; Mechanical Engineering

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APA (6^th Edition):

Bagchi, A. (2010). Natural convection in horizontal fluid-superposed porous layers heated locally from below. (Doctoral Dissertation). University of Minnesota. Retrieved from http://purl.umn.edu/99290

Chicago Manual of Style (16^th Edition):

Bagchi, Aniruddha. “Natural convection in horizontal fluid-superposed porous layers heated locally from below.” 2010. Doctoral Dissertation, University of Minnesota. Accessed February 17, 2020. http://purl.umn.edu/99290.

MLA Handbook (7^th Edition):

Bagchi, Aniruddha. “Natural convection in horizontal fluid-superposed porous layers heated locally from below.” 2010. Web. 17 Feb 2020.

Vancouver:

Bagchi A. Natural convection in horizontal fluid-superposed porous layers heated locally from below. [Internet] [Doctoral dissertation]. University of Minnesota; 2010. [cited 2020 Feb 17]. Available from: http://purl.umn.edu/99290.

Council of Science Editors:

Bagchi A. Natural convection in horizontal fluid-superposed porous layers heated locally from below. [Doctoral Dissertation]. University of Minnesota; 2010. Available from: http://purl.umn.edu/99290

17. 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)

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…

10 more images…

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APA (6^th 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 (16^th 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 February 17, 2020. http://hdl.handle.net/1957/56361.

MLA Handbook (7^th 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. 17 Feb 2020.

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 2020 Feb 17]. 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

18. 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 (6^th 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 (16^th Edition):

Afsharvahid, Shahrooz. “Nitrogen oxides reduction in a porous burner.” 2016. Thesis, University of Adelaide. Accessed February 17, 2020. 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 (7^th Edition):

Afsharvahid, Shahrooz. “Nitrogen oxides reduction in a porous burner.” 2016. Web. 17 Feb 2020.

Vancouver:

Afsharvahid S. Nitrogen oxides reduction in a porous burner. [Internet] [Thesis]. University of Adelaide; 2016. [cited 2020 Feb 17]. 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 Wisconsin – Milwaukee

19. 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 (6^th 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 (16^th 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 February 17, 2020. https://dc.uwm.edu/etd/2302.

MLA Handbook (7^th Edition):

Faghihi Zarandi, Mohammad Amin. “Experimental, Theoretical and Numerical Evaluation of Wicking Models for Liquid Imbibition in Dry Porous Wicks.” 2019. Web. 17 Feb 2020.

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 2020 Feb 17]. 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

20. Falsaperla, Paolo. Stability in Convection Problems for Fluids and Flows in Porous Media with General Boundary Conditions.

Degree: 2011, Università degli Studi di Catania

URL: http://hdl.handle.net/10761/192

► We investigate the onset of thermal convection in fluid layers and layers of fluids saturating a porous medium, when the temperature field is subject to… (more)

▼ We investigate the onset of thermal convection in fluid layers and layers of fluids saturating a porous medium, when the temperature field is subject to the so called "natural" or Newton-Robin boundary conditions. Special attention is devoted to the limit case of fixed heat flux boundary conditions, corresponding to Neumann conditions on the temperature. Several interesting results, both from a physical and a mathematical point of view, appear when such conditions, coupled with one or more stabilizing fields (rotation, solute and magnetic field), are considered. The transition from fixed temperatures to fixed heat fluxes is shown to be destabilizing in all cases. In Part I, we study fluids modeled by the Oberbeck-Boussinesq equations. When further fields are considered, additional equations and terms are included. In Part II, flows in porous media are described by the Darcy law, with and without the inclusion of an inertial term. Even for this system some stabilizing effects are considered. In Chapter 3 we study the rotating Benard problem. The wave number of the critical perturbations is shown to be zero, but only up to a *threshold of rotation speed* (depending on the kinetic boundary conditions). In Chapter 4 the Benard problem for a binary fluid is investigated. In this case, the stabilizing effect of a gradient of solute is *totally lost* for fixed heat fluxes. In Chapter 5 it is shown that, when the same system is rotating, the solute field is again stabilizing, and the critical wave number is positive in some regions of values of rotation and concentration gradient. A more complex interaction, between rotation and magnetic field, is briefly discussed in Chapter 6. Again, zero and non-zero wave numbers appear for different values of the parameters. The solute Benard problem is also investigated in Chapter 7, along the lines of the classical book of Chandrasekhar, in a fully algebraic way. Here, finite slip boundary conditions, and Robin conditions on the solute field are also taken into account. Flow in a rotating porous layer, and flow of a binary mixture in a porous layer, are studied in Chapters 8 and 9, with results qualitatively similar to those obtained for the Benard system. The effects of inertia and rotation are investigated in Chapter 10, with a detailed analysis of the region in parameter space corresponding to the onset of stationary convection or overstability. For most of the above systems, an asymptotic analysis for vanishing wave numbers was also performed, providing support to numerical calculations and some explicit analytic results.

Subjects/Keywords: Fluid Dynamics; Stability; Porous Media; Mathematical Physics

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APA (6^th Edition):

Falsaperla, P. (2011). Stability in Convection Problems for Fluids and Flows in Porous Media with General Boundary Conditions. (Thesis). Università degli Studi di Catania. Retrieved from http://hdl.handle.net/10761/192

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Falsaperla, Paolo. “Stability in Convection Problems for Fluids and Flows in Porous Media with General Boundary Conditions.” 2011. Thesis, Università degli Studi di Catania. Accessed February 17, 2020. http://hdl.handle.net/10761/192.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Falsaperla, Paolo. “Stability in Convection Problems for Fluids and Flows in Porous Media with General Boundary Conditions.” 2011. Web. 17 Feb 2020.

Vancouver:

Falsaperla P. Stability in Convection Problems for Fluids and Flows in Porous Media with General Boundary Conditions. [Internet] [Thesis]. Università degli Studi di Catania; 2011. [cited 2020 Feb 17]. Available from: http://hdl.handle.net/10761/192.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Falsaperla P. Stability in Convection Problems for Fluids and Flows in Porous Media with General Boundary Conditions. [Thesis]. Università degli Studi di Catania; 2011. Available from: http://hdl.handle.net/10761/192

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Alberta

21. 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)

Subjects/Keywords: permeability; Porous media; microfluidics; porosity; pressure drop

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APA (6^th 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 (16^th Edition):

Joseph,Jerry. “Quantification of transport properties in microfluidic porous media.” 2012. Masters Thesis, University of Alberta. Accessed February 17, 2020. 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 (7^th Edition):

Joseph,Jerry. “Quantification of transport properties in microfluidic porous media.” 2012. Web. 17 Feb 2020.

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 2020 Feb 17]. 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

22. 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 · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th 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 February 17, 2020. 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 (7^th 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. 17 Feb 2020.

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 2020 Feb 17]. 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

Laurentian University

23. Schafrik, Sidney. The use of packed sphere modelling for airflow and heat exchange analysis in broken or fragmented rock .

Degree: 2015, Laurentian University

URL: https://zone.biblio.laurentian.ca/dspace/handle/10219/2309

► Airflow and heat exchange characterizations through large bodies of fragmented rock in mines, such as those at Creighton and Kidd Creek Mines, reveal them to… (more)

Subjects/Keywords: Porous media; Equivalent continuum; Airflow; Heat exchange

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APA (6^th Edition):

Schafrik, S. (2015). The use of packed sphere modelling for airflow and heat exchange analysis in broken or fragmented rock . (Thesis). Laurentian University. Retrieved from https://zone.biblio.laurentian.ca/dspace/handle/10219/2309

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Schafrik, Sidney. “The use of packed sphere modelling for airflow and heat exchange analysis in broken or fragmented rock .” 2015. Thesis, Laurentian University. Accessed February 17, 2020. https://zone.biblio.laurentian.ca/dspace/handle/10219/2309.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Schafrik, Sidney. “The use of packed sphere modelling for airflow and heat exchange analysis in broken or fragmented rock .” 2015. Web. 17 Feb 2020.

Vancouver:

Schafrik S. The use of packed sphere modelling for airflow and heat exchange analysis in broken or fragmented rock . [Internet] [Thesis]. Laurentian University; 2015. [cited 2020 Feb 17]. Available from: https://zone.biblio.laurentian.ca/dspace/handle/10219/2309.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Schafrik S. The use of packed sphere modelling for airflow and heat exchange analysis in broken or fragmented rock . [Thesis]. Laurentian University; 2015. Available from: https://zone.biblio.laurentian.ca/dspace/handle/10219/2309

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

24. 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

None

References p.190-195

Advisors/Committee Members: Lakshmi Prasannam, V, Rao, C N B.

Subjects/Keywords: Porous Media; mathematics

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APA (6^th 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 (16^th 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 February 17, 2020. 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 (7^th Edition):

Raja Rani, T. “Convection in porous media with surface temperature variations, variable fluid properties, magnetic field, radiation and stratification; -.” 2010. Web. 17 Feb 2020.

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 2020 Feb 17]. 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

University of Illinois – Urbana-Champaign

25. Matsumura, Yuya. Numerical simulation of fluid flow through porous media using the immersed boundary method.

Degree: PhD, 4048, 2014, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/50515

► The ghost cell immersed boundary method coupled with a finite difference based Navier-Stokes solver has been developed. The flow solver is used to analyze the… (more)

Subjects/Keywords: Porous media; Immersed boundary method; Porosity; Polydispersity

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APA (6^th Edition):

Matsumura, Y. (2014). Numerical simulation of fluid flow through porous media using the immersed boundary method. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/50515

Chicago Manual of Style (16^th Edition):

Matsumura, Yuya. “Numerical simulation of fluid flow through porous media using the immersed boundary method.” 2014. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed February 17, 2020. http://hdl.handle.net/2142/50515.

MLA Handbook (7^th Edition):

Matsumura, Yuya. “Numerical simulation of fluid flow through porous media using the immersed boundary method.” 2014. Web. 17 Feb 2020.

Vancouver:

Matsumura Y. Numerical simulation of fluid flow through porous media using the immersed boundary method. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2014. [cited 2020 Feb 17]. Available from: http://hdl.handle.net/2142/50515.

Council of Science Editors:

Matsumura Y. Numerical simulation of fluid flow through porous media using the immersed boundary method. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2014. Available from: http://hdl.handle.net/2142/50515

University of Alberta

26. 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)

Subjects/Keywords: Microfluidic Devices; Porous Media; Biofilm Streamers

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APA (6^th 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 (16^th Edition):

Valiei, Amin. “Biofilm Streamer Formation in a Porous Microfluidic Device.” 2012. Masters Thesis, University of Alberta. Accessed February 17, 2020. https://era.library.ualberta.ca/files/cc08hh041.

MLA Handbook (7^th Edition):

Valiei, Amin. “Biofilm Streamer Formation in a Porous Microfluidic Device.” 2012. Web. 17 Feb 2020.

Vancouver:

Valiei A. Biofilm Streamer Formation in a Porous Microfluidic Device. [Internet] [Masters thesis]. University of Alberta; 2012. [cited 2020 Feb 17]. 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

27. 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 (6^th 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 (16^th Edition):

Hoogland, F. “Evaporation rates from square capillaries limited by corner flow viscous losses.” 2012. Masters Thesis, Universiteit Utrecht. Accessed February 17, 2020. http://dspace.library.uu.nl:8080/handle/1874/252898.

MLA Handbook (7^th Edition):

Hoogland, F. “Evaporation rates from square capillaries limited by corner flow viscous losses.” 2012. Web. 17 Feb 2020.

Vancouver:

Hoogland F. Evaporation rates from square capillaries limited by corner flow viscous losses. [Internet] [Masters thesis]. Universiteit Utrecht; 2012. [cited 2020 Feb 17]. 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

Penn State University

28. Cheng, Zhigang. Thermodynamic Properties of Helium in Porous Media.

Degree: PhD, Physics, 2013, Penn State University

URL: https://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.

Subjects/Keywords: helium; heat capacity; thermal conductivity; porous media

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APA (6^th Edition):

Cheng, Z. (2013). Thermodynamic Properties of Helium in Porous Media. (Doctoral Dissertation). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/17507

Chicago Manual of Style (16^th Edition):

Cheng, Zhigang. “Thermodynamic Properties of Helium in Porous Media.” 2013. Doctoral Dissertation, Penn State University. Accessed February 17, 2020. https://etda.libraries.psu.edu/catalog/17507.

MLA Handbook (7^th Edition):

Cheng, Zhigang. “Thermodynamic Properties of Helium in Porous Media.” 2013. Web. 17 Feb 2020.

Vancouver:

Cheng Z. Thermodynamic Properties of Helium in Porous Media. [Internet] [Doctoral dissertation]. Penn State University; 2013. [cited 2020 Feb 17]. Available from: https://etda.libraries.psu.edu/catalog/17507.

Council of Science Editors:

Cheng Z. Thermodynamic Properties of Helium in Porous Media. [Doctoral Dissertation]. Penn State University; 2013. Available from: https://etda.libraries.psu.edu/catalog/17507

Louisiana State University

29. Bou-Mikael, Saade Alexis. Design and optimization of 2.5 dimension porous media micromodel for nanosensor flow experiments.

Degree: MSChE, Chemical Engineering, 2012, Louisiana State University

URL: etd-04272012-114012 ; https://digitalcommons.lsu.edu/gradschool_theses/511

► Micromodels are used to visualize and study pore-scale phenomena such as immiscible displacements in porous media, foam flow behavior, and CO2 flooding. The understanding gained… (more)

▼ Micromodels are used to visualize and study pore-scale phenomena such as immiscible displacements in porous media, foam flow behavior, and CO2 flooding. The understanding gained from these experiments can be used to develop models to predict future behavior of the reservoir. Most micromodels are constructed using lithography techniques that are restricted to 2D patterns that require artificial generation or manipulation of images to develop connected micromodels. Characteristics innate to the original rock structure are often lost or skewed in developing micromodels that bear little resemblance to the original media. Alternative microfabrication techniques using a micromilling tool have allowed us to vary the floor height in a micromodel, thus giving some variation in the third dimension. We refer to these structures (with varying floor height and fixed ceiling, and which cannot have passages on top of one another) as 2.5D micromodels. Using a technique called depth averaging, in which we take a section of a 3D voxel image of porous media and project the solid voxels down while simultaneously pushing the void space above, we generate micromodels that may allow for more accurate representations of the pore structure in 3D rock. The design of the etched pattern requires the selection of a specific depth (or number of XMCT image slice) over which to average the image data. The 2.5-D pattern was obtained by optimizing a series of parameters to ensure the structure and flow patterns matched as closely as possible to the equivalent 3D structure and flow as can be accommodated given the restricted dimensionality. Parameters considered include flow-based parameters, common statistical correlations, and a host of topological parameters obtained by network model generation techniques. For a Boise sandstone core sample imaged at 5.07 µm/pixel, an optimized depth of 115 µm gave the most accurate measures across the range of parameters. However, due to constraints regarding the resolution of the micromilling process, a second series of flow simulations were conducted in the originally optimized region of interest (100-150 µm) for a lower resolution image that resulted in the selection of 130 µm to depth average. This design was then used to fabricate a brass mold insert. The process of developing the microchips for nanosensor experiments is currently in the stage of assembling the PMMA chips.

Subjects/Keywords: micromodel; 2.5-dimension; xmct; porous media; microfluidics

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APA (6^th Edition):

Bou-Mikael, S. A. (2012). Design and optimization of 2.5 dimension porous media micromodel for nanosensor flow experiments. (Masters Thesis). Louisiana State University. Retrieved from etd-04272012-114012 ; https://digitalcommons.lsu.edu/gradschool_theses/511

Chicago Manual of Style (16^th Edition):

Bou-Mikael, Saade Alexis. “Design and optimization of 2.5 dimension porous media micromodel for nanosensor flow experiments.” 2012. Masters Thesis, Louisiana State University. Accessed February 17, 2020. etd-04272012-114012 ; https://digitalcommons.lsu.edu/gradschool_theses/511.

MLA Handbook (7^th Edition):

Bou-Mikael, Saade Alexis. “Design and optimization of 2.5 dimension porous media micromodel for nanosensor flow experiments.” 2012. Web. 17 Feb 2020.

Vancouver:

Bou-Mikael SA. Design and optimization of 2.5 dimension porous media micromodel for nanosensor flow experiments. [Internet] [Masters thesis]. Louisiana State University; 2012. [cited 2020 Feb 17]. Available from: etd-04272012-114012 ; https://digitalcommons.lsu.edu/gradschool_theses/511.

Council of Science Editors:

Bou-Mikael SA. Design and optimization of 2.5 dimension porous media micromodel for nanosensor flow experiments. [Masters Thesis]. Louisiana State University; 2012. Available from: etd-04272012-114012 ; https://digitalcommons.lsu.edu/gradschool_theses/511

30. Rimas, Zilvinas. Sorption in disordered porous media.

Degree: PhD, 2017, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/268094 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744249

► The lattice-gas model of sorption in disordered porous media is studied for a variety of settings, using existing, updated and newly developed numerical techniques. Firstly,… (more)

▼ The lattice-gas model of sorption in disordered porous media is studied for a variety of settings, using existing, updated and newly developed numerical techniques. Firstly, we construct an efficient algorithm to calculate the exact partition function for small lattice-gas systems. The exact partition function is used for detailed analysis of the core features exhibited by such systems. We proceed to develop an interactive Monte Carlo (MC) simulation engine, that simulates sorption in a porous media sample and provides real-time visual data of the state space projection and the 3d view of the sample among other parameters of interest, as the external fields are manipulated. The use of such tool provides a more intuitive understanding of the system behaviour. The MC simulations are employed to study sorption in several porous solids: silica aerogel, Vycor glass and soil. We investigate how the phenomena depend on the microstructure of the original samples, how the behaviour varies with the external conditions, and how it is reflected in the paths that the system takes across its state space. Secondly, we develop two methods for estimation of the relative degeneracy (the number of microstates that have the same value of some macroscopic variables) in the systems that are too large to be handled exactly. The methods, based on a restricted infinite temperature sampling, obtain equidegenerate surfaces and the degeneracy gradient across the state space. Combined with the knowledge of an internal energy of a microstate, it enables us to construct the free energy map and thus the equilibrium probability distribution for the studied projection of the state space. Thirdly, the jump-walking Monte-Carlo algorithm is revisited and updated to study the equilibrium properties of systems exhibiting quasi-ergodicity. It is designed for a single processing thread as opposed to currently predominant algorithms for large parallel processing systems. The updated algorithm is tested on the Ising model and applied to the lattice-gas model for sorption in aerogel and Vycor glass at low temperatures, when dynamics of the system is significantly slowed down. It is demonstrated that the updated jump-walking simulations are able to produce equilibrium isotherms which are typically hidden by the hysteresis effect characteristic of the standard single-flip simulations. As a result, we answer the long standing question about the existence of the first-order phase transitions in Vycor. Finally, we investigate sorption in several distinct topology network representations of soil and aerogel samples and demonstrate that the recently developed analytical techniques for random networks can be used to achieve a qualitative understanding of the phenomena in real materials.

Subjects/Keywords: Phase transitions; Porous media; Monte Carlo

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APA (6^th Edition):

Rimas, Z. (2017). Sorption in disordered porous media. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/268094 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744249

Chicago Manual of Style (16^th Edition):

Rimas, Zilvinas. “Sorption in disordered porous media.” 2017. Doctoral Dissertation, University of Cambridge. Accessed February 17, 2020. https://www.repository.cam.ac.uk/handle/1810/268094 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744249.

MLA Handbook (7^th Edition):

Rimas, Zilvinas. “Sorption in disordered porous media.” 2017. Web. 17 Feb 2020.

Vancouver:

Rimas Z. Sorption in disordered porous media. [Internet] [Doctoral dissertation]. University of Cambridge; 2017. [cited 2020 Feb 17]. Available from: https://www.repository.cam.ac.uk/handle/1810/268094 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744249.

Council of Science Editors:

Rimas Z. Sorption in disordered porous media. [Doctoral Dissertation]. University of Cambridge; 2017. Available from: https://www.repository.cam.ac.uk/handle/1810/268094 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.744249

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