subject:(Gradient flow)

Anna University

1. Prabhu britto A. Investigations and identification of A novel application for discrete Cosine transform based gradient Vector flow active contours Extended as DCT based NGVF active contours;.

Degree: Investigations and identification of A novel application for discrete Cosine transform based gradient Vector flow active contours Extended as DCT based NGVF active contours, 2015, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/44193

►

Chromosomes are responsible for the determination and newlinetransmission of hereditary characteristics Defects in chromosomes can lead newlineto abnormalities in the structure or function of that… (more)

Subjects/Keywords: Active Contour seems; Gradient Vector Flow

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APA (6^th Edition):

A, P. b. (2015). Investigations and identification of A novel application for discrete Cosine transform based gradient Vector flow active contours Extended as DCT based NGVF active contours;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/44193

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):

A, Prabhu britto. “Investigations and identification of A novel application for discrete Cosine transform based gradient Vector flow active contours Extended as DCT based NGVF active contours;.” 2015. Thesis, Anna University. Accessed March 01, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/44193.

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

MLA Handbook (7^th Edition):

A, Prabhu britto. “Investigations and identification of A novel application for discrete Cosine transform based gradient Vector flow active contours Extended as DCT based NGVF active contours;.” 2015. Web. 01 Mar 2021.

Vancouver:

A Pb. Investigations and identification of A novel application for discrete Cosine transform based gradient Vector flow active contours Extended as DCT based NGVF active contours;. [Internet] [Thesis]. Anna University; 2015. [cited 2021 Mar 01]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/44193.

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

Council of Science Editors:

A Pb. Investigations and identification of A novel application for discrete Cosine transform based gradient Vector flow active contours Extended as DCT based NGVF active contours;. [Thesis]. Anna University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/44193

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

Delft University of Technology

2. de Ridder, Jelte (author). Horizontal Slurry Transport on a Large Laboratory Scale.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:fe2dea62-8f20-4b95-9564-e654d205e35f

► The first head loss prediction methods for hydraulic transport of solids in pipes, date back to the years '50 of last century. The principles are… (more)

▼ The first head loss prediction methods for hydraulic transport of solids in pipes, date back to the years '50 of last century. The principles are still applied today. Although it is observed that obtained results may differ from reality, when the circumstances do not represent the situation of the original experiment. To investigate this, the performance of various prediction models is analysed on a large scale laboratory test set-up. In recent publications, several researchers observed disturbances in their expected flow patterns. Described as either 'unsteady flow’, ‘instability’ or 'unexpected mechanism'. Talmon developed the theory that the occurrence of these events could be explained by transient processes in the pipe flow. It is recommended to use a test pipe with great length. To verify, by longitudinal pressure profile measurement, that equilibrium is measured, and that indicated transients are captured by the measuring system. A laboratory test set-up is provided by the CCCC National Engineering Research Center of Dredging Technology and Equipment Co., Ltd. In a joint research program with Delft University of Technology: the pressure drops for water and mixture flow over the pipeline length are analysed. This is done for horizontal hydraulic transport. The focus is on comparing test results with existing theories and find explanations to deviating results. If instabilities are observed, the gathered data can be used for further research on density waves in pipelines. In the liquid flow experiment, three prediction methods derived from the Colebrook-White equation are analysed: Darcy-Weisbach, Swamee & Jain and RangaRadju & Garde. Considering the pipeline to be smooth, the predicted values are similar. The difference between them is almost nil. Furthermore, the result shows good correspondence with the data acquired on the test set-up. In the mixture experiment, four prediction methods are analysed: Durand, Führböter, Jufin & Lopatin and Wilson. They are compared with laboratory data of test conducted in a heterogeneous flow regime. With a velocity ranging from three to six meter per second and concentrations of: 4.4, 8.1, 12.3 and 14.6 percent. In a general approach, considering all transport velocities and concentrations. It is observed that the theoretical principle described by Durand shows the closest resemblance with the experimental data. When only the concentrations are considered, a distinction has to be made. For the two lowest mixture densities, the Führboter method gives the best fit. For the highest two, the best correlation is according to the Durand theory. The principles of Jufin & Lopatin and Wilson underestimate the pressure loss. Where the difference of the former is significantly larger in comparison to the latter. For the lowest velocities of the twelve and fifteen percent slurry experiments, stationary waves over the pipeline length are observed. Due to the length of the test set-up, the transition to equilibrium flow is clearly visible. It demonstrates that longer flow… Advisors/Committee Members: Talmon, Arnold (mentor), van Rhee, Cees (graduation committee), Wang, Feixin (mentor), Delft University of Technology (degree granting institution).

Subjects/Keywords: Hydraulic transport; Pipeline; Slurry flow; Hydraulic gradient

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APA (6^th Edition):

de Ridder, J. (. (2018). Horizontal Slurry Transport on a Large Laboratory Scale. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:fe2dea62-8f20-4b95-9564-e654d205e35f

Chicago Manual of Style (16^th Edition):

de Ridder, Jelte (author). “Horizontal Slurry Transport on a Large Laboratory Scale.” 2018. Masters Thesis, Delft University of Technology. Accessed March 01, 2021. http://resolver.tudelft.nl/uuid:fe2dea62-8f20-4b95-9564-e654d205e35f.

MLA Handbook (7^th Edition):

de Ridder, Jelte (author). “Horizontal Slurry Transport on a Large Laboratory Scale.” 2018. Web. 01 Mar 2021.

Vancouver:

de Ridder J(. Horizontal Slurry Transport on a Large Laboratory Scale. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 01]. Available from: http://resolver.tudelft.nl/uuid:fe2dea62-8f20-4b95-9564-e654d205e35f.

Council of Science Editors:

de Ridder J(. Horizontal Slurry Transport on a Large Laboratory Scale. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:fe2dea62-8f20-4b95-9564-e654d205e35f

University of Victoria

3. Bowles, Malcolm. Weak Solutions to a Fractional Fokker-Planck Equation via Splitting and Wasserstein Gradient Flow.

Degree: Department of Mathematics and Statistics, 2014, University of Victoria

URL: http://hdl.handle.net/1828/5591

► In this thesis, we study a linear fractional Fokker-Planck equation that models non-local (`fractional') diffusion in the presence of a potential field. The non-locality is… (more)

Subjects/Keywords: splitting; Fractional Laplacian; Wasserstein Gradient Flow

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APA (6^th Edition):

Bowles, M. (2014). Weak Solutions to a Fractional Fokker-Planck Equation via Splitting and Wasserstein Gradient Flow. (Masters Thesis). University of Victoria. Retrieved from http://hdl.handle.net/1828/5591

Chicago Manual of Style (16^th Edition):

Bowles, Malcolm. “Weak Solutions to a Fractional Fokker-Planck Equation via Splitting and Wasserstein Gradient Flow.” 2014. Masters Thesis, University of Victoria. Accessed March 01, 2021. http://hdl.handle.net/1828/5591.

MLA Handbook (7^th Edition):

Bowles, Malcolm. “Weak Solutions to a Fractional Fokker-Planck Equation via Splitting and Wasserstein Gradient Flow.” 2014. Web. 01 Mar 2021.

Vancouver:

Bowles M. Weak Solutions to a Fractional Fokker-Planck Equation via Splitting and Wasserstein Gradient Flow. [Internet] [Masters thesis]. University of Victoria; 2014. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1828/5591.

Council of Science Editors:

Bowles M. Weak Solutions to a Fractional Fokker-Planck Equation via Splitting and Wasserstein Gradient Flow. [Masters Thesis]. University of Victoria; 2014. Available from: http://hdl.handle.net/1828/5591

Cornell University

4. Bailesteanu, Mihai. The Heat Equation Under The Ricci Flow.

Degree: PhD, Mathematics, 2011, Cornell University

URL: http://hdl.handle.net/1813/29406

► This paper has two main results. The first deals with determining gradient estimates for positive solutions of the heat equation on a manifold whose metric… (more)

Subjects/Keywords: Heat equation; Ricci flow; geometric flow; gradient estimates

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APA (6^th Edition):

Bailesteanu, M. (2011). The Heat Equation Under The Ricci Flow. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/29406

Chicago Manual of Style (16^th Edition):

Bailesteanu, Mihai. “The Heat Equation Under The Ricci Flow.” 2011. Doctoral Dissertation, Cornell University. Accessed March 01, 2021. http://hdl.handle.net/1813/29406.

MLA Handbook (7^th Edition):

Bailesteanu, Mihai. “The Heat Equation Under The Ricci Flow.” 2011. Web. 01 Mar 2021.

Vancouver:

Bailesteanu M. The Heat Equation Under The Ricci Flow. [Internet] [Doctoral dissertation]. Cornell University; 2011. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1813/29406.

Council of Science Editors:

Bailesteanu M. The Heat Equation Under The Ricci Flow. [Doctoral Dissertation]. Cornell University; 2011. Available from: http://hdl.handle.net/1813/29406

University of Minnesota

5. Erickson, Ryan David. Experimental investigation of disc cavity leakage flow and hub endwall contouring in a linear rotor cascade.

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

URL: http://purl.umn.edu/90852

►

University of Minnesota M.S. thesis. April 2010. Major: Mechanical Engineering. Advisor: Terrence W. Simon. 1 computer file (PDF); xv, 163 pages, appendix A. Ill. (some… (more)

▼

University of Minnesota M.S. thesis. April 2010. Major: Mechanical Engineering. Advisor: Terrence W. Simon. 1 computer file (PDF); xv, 163 pages, appendix A. Ill. (some col.)

Experimental and computational results which document mixing of passage flow and leakage flow in a rotor stage of a high pressure turbine are presented. Of specific focus are the effects of hub endwall contour geometries on mixing of the two flows and on film cooling coverage by the leakage flow over the endwall. The understanding of fluid physics in this area has received increased interest recently due to higher endwall heat loads as a result of new combustor designs. The setting is a linear, stationary cascade which represents many features of the actual engine, such as geometry, Reynolds number, approach flow turbulence level and scale, and leakage mass flow rates. Rotation, density gradient, and upstream airfoil row effects are not represented. Two hub endwall geometries which give quite different acceleration profiles in the airfoil row entry plane region are examined. The flow field in the leakage flow delivery plenum, important to the mixing process, is characterized by measurements and computation. The effects of leakage flow injection on the passage aerodynamic losses are also measured and computed. The loss pattern at the passage exit shows the effects of boundary layers on the pressure surface, the suction surface, and the two endwalls. Passage secondary flow features, such as remnants of the passage, horseshoe, and corner vortices are visible in the exit passage loss data. The effects of changes in leakage flow injection rate on the losses are found to be minimal for the cases studied. Measurements of adiabatic effectiveness on the contoured endwall show coverage only over the upstream portion of the passage, with concentration on the suction side. The effects of the horseshoe and corner vortices on mixing of the leakage and passage flows are evident in the effectiveness pattern. Computed effectiveness distributions show similar trends to those seen in the measurements; however, measured effectiveness values are generally lower than computed values, indicating the more rapid dissipation of turbulent transport in the computations than in reality. Comparison of effectiveness distributions shows that the contoured endwall geometry referred to as the “dolphin nose” leads to better overall film cooling coverage on the endwall.

Advisors/Committee Members: Terrence W. Simon.

Subjects/Keywords: Passage flow; Leakage flow; Hub Endwall; Density gradient; Aerodynamic losses; Mechanical Engineering

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APA (6^th Edition):

Erickson, R. D. (2010). Experimental investigation of disc cavity leakage flow and hub endwall contouring in a linear rotor cascade. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/90852

Chicago Manual of Style (16^th Edition):

Erickson, Ryan David. “Experimental investigation of disc cavity leakage flow and hub endwall contouring in a linear rotor cascade.” 2010. Masters Thesis, University of Minnesota. Accessed March 01, 2021. http://purl.umn.edu/90852.

MLA Handbook (7^th Edition):

Erickson, Ryan David. “Experimental investigation of disc cavity leakage flow and hub endwall contouring in a linear rotor cascade.” 2010. Web. 01 Mar 2021.

Vancouver:

Erickson RD. Experimental investigation of disc cavity leakage flow and hub endwall contouring in a linear rotor cascade. [Internet] [Masters thesis]. University of Minnesota; 2010. [cited 2021 Mar 01]. Available from: http://purl.umn.edu/90852.

Council of Science Editors:

Erickson RD. Experimental investigation of disc cavity leakage flow and hub endwall contouring in a linear rotor cascade. [Masters Thesis]. University of Minnesota; 2010. Available from: http://purl.umn.edu/90852

NSYSU

6. Cheng, Bang-yuan. Extending the stable energy diagram of rotating Bose-Einstein condensates.

Degree: Master, Applied Mathematics, 2014, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0605114-151405

► The rotating Bose-Einstein condensates describe the quantum state of dilute atomic gases imposed by a laser beam rotating with an angular velocity applied to the… (more)

Subjects/Keywords: energy diagram; optimization; Bose-Einstein condensates; continuation method; gradient flow method

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APA (6^th Edition):

Cheng, B. (2014). Extending the stable energy diagram of rotating Bose-Einstein condensates. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0605114-151405

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):

Cheng, Bang-yuan. “Extending the stable energy diagram of rotating Bose-Einstein condensates.” 2014. Thesis, NSYSU. Accessed March 01, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0605114-151405.

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

MLA Handbook (7^th Edition):

Cheng, Bang-yuan. “Extending the stable energy diagram of rotating Bose-Einstein condensates.” 2014. Web. 01 Mar 2021.

Vancouver:

Cheng B. Extending the stable energy diagram of rotating Bose-Einstein condensates. [Internet] [Thesis]. NSYSU; 2014. [cited 2021 Mar 01]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0605114-151405.

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

Council of Science Editors:

Cheng B. Extending the stable energy diagram of rotating Bose-Einstein condensates. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0605114-151405

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

University of Alberta

7. Lengyel, Tibor. Geothermics of the Phanerozoic strata of Saskatchewan.

Degree: MS, Department of Earth and Atmospheric Sciences, 2013, University of Alberta

URL: https://era.library.ualberta.ca/files/vt150k31t

► New data and revised processing methods yielded a revised understanding of the geothermics of the Phanerozoic strata in Saskatchewan. Temperatures increase with depth from 5… (more)

Subjects/Keywords: geothermics; Saskatchewan; heat flow; quality control; geothermal gradient

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APA (6^th Edition):

Lengyel, T. (2013). Geothermics of the Phanerozoic strata of Saskatchewan. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/vt150k31t

Chicago Manual of Style (16^th Edition):

Lengyel, Tibor. “Geothermics of the Phanerozoic strata of Saskatchewan.” 2013. Masters Thesis, University of Alberta. Accessed March 01, 2021. https://era.library.ualberta.ca/files/vt150k31t.

MLA Handbook (7^th Edition):

Lengyel, Tibor. “Geothermics of the Phanerozoic strata of Saskatchewan.” 2013. Web. 01 Mar 2021.

Vancouver:

Lengyel T. Geothermics of the Phanerozoic strata of Saskatchewan. [Internet] [Masters thesis]. University of Alberta; 2013. [cited 2021 Mar 01]. Available from: https://era.library.ualberta.ca/files/vt150k31t.

Council of Science Editors:

Lengyel T. Geothermics of the Phanerozoic strata of Saskatchewan. [Masters Thesis]. University of Alberta; 2013. Available from: https://era.library.ualberta.ca/files/vt150k31t

University of Manitoba

8. Mikula, Paul. Gradient flow in holographic superconductors.

Degree: Physics and Astronomy, 2019, University of Manitoba

URL: http://hdl.handle.net/1993/34362

► We study the gradient flow equations derived from an Einstein-Maxwell-Higgs model in 3+1 dimensions. We see how this model relates to a phenomenological description of… (more)

Subjects/Keywords: Gradient flow; Theoretical physics; Holographic principle; AdS/CMT

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APA (6^th Edition):

Mikula, P. (2019). Gradient flow in holographic superconductors. (Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/34362

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):

Mikula, Paul. “Gradient flow in holographic superconductors.” 2019. Thesis, University of Manitoba. Accessed March 01, 2021. http://hdl.handle.net/1993/34362.

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

MLA Handbook (7^th Edition):

Mikula, Paul. “Gradient flow in holographic superconductors.” 2019. Web. 01 Mar 2021.

Vancouver:

Mikula P. Gradient flow in holographic superconductors. [Internet] [Thesis]. University of Manitoba; 2019. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1993/34362.

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

Council of Science Editors:

Mikula P. Gradient flow in holographic superconductors. [Thesis]. University of Manitoba; 2019. Available from: http://hdl.handle.net/1993/34362

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

9. Mikula, Paul. Yang-Mills flow in 1+1 dimensions coupled with a scalar field.

Degree: Physics and Astronomy, 2015, University of Manitoba

URL: http://hdl.handle.net/1993/30154

► We define a Yang-Mills model in 1+1 dimensions coupled to a real scalar field and we study the Yang-Mills flow equations for this simple model.… (more)

Subjects/Keywords: Gradient Flow; Gauge Fields

…introduced by Atiyah and Bott [7] as the gradient flow of the Yang-Mills action on… …action, we can consider its gradient flow as a generalization of the Yang-Mills flow equations… …dxn L[Aµ , φ] (1.24) We define the gradient flow of the action in… …Mills flow is a gradient flow, we can expect it to behave in a way similar to other gradient… …term. We define the flow as the gradient flow of the new action which leads to scalar field…

1 more image…

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APA (6^th Edition):

Mikula, P. (2015). Yang-Mills flow in 1+1 dimensions coupled with a scalar field. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/30154

Chicago Manual of Style (16^th Edition):

Mikula, Paul. “Yang-Mills flow in 1+1 dimensions coupled with a scalar field.” 2015. Masters Thesis, University of Manitoba. Accessed March 01, 2021. http://hdl.handle.net/1993/30154.

MLA Handbook (7^th Edition):

Mikula, Paul. “Yang-Mills flow in 1+1 dimensions coupled with a scalar field.” 2015. Web. 01 Mar 2021.

Vancouver:

Mikula P. Yang-Mills flow in 1+1 dimensions coupled with a scalar field. [Internet] [Masters thesis]. University of Manitoba; 2015. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1993/30154.

Council of Science Editors:

Mikula P. Yang-Mills flow in 1+1 dimensions coupled with a scalar field. [Masters Thesis]. University of Manitoba; 2015. Available from: http://hdl.handle.net/1993/30154

Cranfield University

10. Baba, Yahaya Danjuma. Experimental investigation of high viscous multiphase flow in horizontal pipelines.

Degree: 2016, Cranfield University

URL: http://dspace.lib.cranfield.ac.uk/handle/1826/16029

► Diminishing reserves of “conventional” light crude oil, increased production costs amidst increased world energy demand over the last decade has spurred industrial interest in the… (more)

▼ Diminishing reserves of “conventional” light crude oil, increased production costs amidst increased world energy demand over the last decade has spurred industrial interest in the production of the significantly and more abundant “unconventional” heavy crude oil. Recent findings have shown that unconventional oil being a veritable energy source accounts for over two-thirds of the world total oil reserve. The exploration of this vast resource for easy production and transportation requires a good understanding of multiphase system for which the knowledge of the effect of fluid viscosity is of great importance. Heavy oils are known for their high liquid viscosities which make them even more difficult and expensive to produce and transport in pipelines at ambient temperatures. In the light of this, it has become imperative to investigate the rheology of high viscosity oils and ways of enhancing its production and transportation since a critical understanding of multiphase flow characteristics are vital to aid engineering design. It is clear from experimental investigation reported so far in literatures and in Cranfield University that the behaviour of high viscosity oil-gas flows differs significantly from that of low viscosity oils. This means that most of the existing prediction models in the literature which were developed from observations of low viscosity liquid-gas flow will not perform accurately when compared to oil-gas flow data for high viscosity oil. Therefore, this research work seek to extend databank and provide a clearer understanding of the physics of high viscous multiphase flows. Experimental investigation have been conducted using 3-inch and 1-inch ID horizontal test facilities for oil-gas and oil-water respectively using different oil viscosities. The effects of liquid viscosities on oil-gas two phase flow parameters (i.e. pressure gradient, mean liquid holdup, slug frequency, slug translational velocity and slug body length) have been discussed. Assessment of existing prediction models and correlations in the literature are also carried out and their performance highlighted. New/improved prediction correlations for high viscosity oil-gas flow slug frequency, slug translational velocity and slug body have been proposed with their performance evaluated against the results obtained for this study and in literature. As for high viscosity oil-water flows, a new flow pattern maps have been established for high viscous oil-water two-phase flow in horizontal pipe with ID = 0.0254 m for which four flow patterns were observed namely; rivulet, core annular, plug and dispersed flows were observed. Generally, it was observed that increase in oil viscosity favoured the Core Annular Flow pattern, similar behaviour was also observed for increased oil holdup. Comparatively analysis of results obtained here with low viscous kerosene and water flow study obtained under similar flow geometry and conditions shows significant difference in flow patterns under similar flow…

Subjects/Keywords: Pressure gradient; flow pattern; liquid holdup; high viscosity; gamma densitometer

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APA (6^th Edition):

Baba, Y. D. (2016). Experimental investigation of high viscous multiphase flow in horizontal pipelines. (Thesis). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/16029

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):

Baba, Yahaya Danjuma. “Experimental investigation of high viscous multiphase flow in horizontal pipelines.” 2016. Thesis, Cranfield University. Accessed March 01, 2021. http://dspace.lib.cranfield.ac.uk/handle/1826/16029.

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

MLA Handbook (7^th Edition):

Baba, Yahaya Danjuma. “Experimental investigation of high viscous multiphase flow in horizontal pipelines.” 2016. Web. 01 Mar 2021.

Vancouver:

Baba YD. Experimental investigation of high viscous multiphase flow in horizontal pipelines. [Internet] [Thesis]. Cranfield University; 2016. [cited 2021 Mar 01]. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/16029.

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

Council of Science Editors:

Baba YD. Experimental investigation of high viscous multiphase flow in horizontal pipelines. [Thesis]. Cranfield University; 2016. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/16029

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

Cranfield University

11. Baba, Yahaya Danjuma. Experimental investigation of high viscous multiphase flow in horizontal pipelines.

Degree: PhD, 2016, Cranfield University

URL: http://dspace.lib.cranfield.ac.uk/handle/1826/16029 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.818363

► Diminishing reserves of “conventional” light crude oil, increased production costs amidst increased world energy demand over the last decade has spurred industrial interest in the… (more)

▼ Diminishing reserves of “conventional” light crude oil, increased production costs amidst increased world energy demand over the last decade has spurred industrial interest in the production of the significantly and more abundant “unconventional” heavy crude oil. Recent findings have shown that unconventional oil being a veritable energy source accounts for over two-thirds of the world total oil reserve. The exploration of this vast resource for easy production and transportation requires a good understanding of multiphase system for which the knowledge of the effect of fluid viscosity is of great importance. Heavy oils are known for their high liquid viscosities which make them even more difficult and expensive to produce and transport in pipelines at ambient temperatures. In the light of this, it has become imperative to investigate the rheology of high viscosity oils and ways of enhancing its production and transportation since a critical understanding of multiphase flow characteristics are vital to aid engineering design. It is clear from experimental investigation reported so far in literatures and in Cranfield University that the behaviour of high viscosity oil-gas flows differs significantly from that of low viscosity oils. This means that most of the existing prediction models in the literature which were developed from observations of low viscosity liquid-gas flow will not perform accurately when compared to oil-gas flow data for high viscosity oil. Therefore, this research work seek to extend databank and provide a clearer understanding of the physics of high viscous multiphase flows. Experimental investigation have been conducted using 3-inch and 1-inch ID horizontal test facilities for oil-gas and oil-water respectively using different oil viscosities. The effects of liquid viscosities on oil-gas two phase flow parameters (i.e. pressure gradient, mean liquid holdup, slug frequency, slug translational velocity and slug body length) have been discussed. Assessment of existing prediction models and correlations in the literature are also carried out and their performance highlighted. New/improved prediction correlations for high viscosity oil-gas flow slug frequency, slug translational velocity and slug body have been proposed with their performance evaluated against the results obtained for this study and in literature. As for high viscosity oil-water flows, a new flow pattern maps have been established for high viscous oil-water two-phase flow in horizontal pipe with ID = 0.0254 m for which four flow patterns were observed namely; rivulet, core annular, plug and dispersed flows were observed. Generally, it was observed that increase in oil viscosity favoured the Core Annular Flow pattern, similar behaviour was also observed for increased oil holdup. Comparatively analysis of results obtained here with low viscous kerosene and water flow study obtained under similar flow geometry and conditions shows significant difference in flow patterns under similar flow conditions.

Subjects/Keywords: Pressure gradient; flow pattern; liquid holdup; high viscosity; gamma densitometer

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APA (6^th Edition):

Baba, Y. D. (2016). Experimental investigation of high viscous multiphase flow in horizontal pipelines. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/16029 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.818363

Chicago Manual of Style (16^th Edition):

Baba, Yahaya Danjuma. “Experimental investigation of high viscous multiphase flow in horizontal pipelines.” 2016. Doctoral Dissertation, Cranfield University. Accessed March 01, 2021. http://dspace.lib.cranfield.ac.uk/handle/1826/16029 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.818363.

MLA Handbook (7^th Edition):

Baba, Yahaya Danjuma. “Experimental investigation of high viscous multiphase flow in horizontal pipelines.” 2016. Web. 01 Mar 2021.

Vancouver:

Baba YD. Experimental investigation of high viscous multiphase flow in horizontal pipelines. [Internet] [Doctoral dissertation]. Cranfield University; 2016. [cited 2021 Mar 01]. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/16029 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.818363.

Council of Science Editors:

Baba YD. Experimental investigation of high viscous multiphase flow in horizontal pipelines. [Doctoral Dissertation]. Cranfield University; 2016. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/16029 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.818363

Louisiana State University

12. Freeman, Matthew. Evaluation of thermal insulation by coal beds in the western Arkoma Basin, OK and implications for large scale geothermal resources.

Degree: MS, Earth Sciences, 2013, Louisiana State University

URL: etd-05092013-212420 ; https://digitalcommons.lsu.edu/gradschool_theses/593

► Weighted average geothermal gradients in the Western Arkoma Basin, Oklahoma are estimated from bottom hole temperatures (BHT) from 158 oil and gas wells. The regional… (more)

▼ Weighted average geothermal gradients in the Western Arkoma Basin, Oklahoma are estimated from bottom hole temperatures (BHT) from 158 oil and gas wells. The regional geothermal gradient is 28.8 °C/km. The central and north central portions of the basin have higher gradients than southern and northern portions, especially in large areas of Pittsburg and Haskell counties where geothermal gradients in excess of 36 °C/km exist. These gradients suggest that temperatures suitable for low temperature geothermal power exist at depths of 2-3 km. Coals have very low thermal conductivity (0.15 – 0.5 W/m°K) acting as thermal insulators. This study examines the impact of coals on the thermal regime. Desmoinesian coal thickness was mapped in the Basin using bulk density curves from 78 well logs. The maximum thickness was about 50 ft of Pennsylvanian coal. However, most wells show much lower amounts (< 20 ft). Ten of eleven wells along a north/south cross section were selected for one dimensional (1D) thermal modeling. Correlation of net coal thickness to the weighted average geothermal gradients and computer models show that coal thickness is too thin to have a significant effect on the geothermal gradient. Temperature gradients in eight wells are consistent with vertical steady state conduction, and two are not. Analytical solutions and temperature logs show that downward movement of cold water can produce the observed geothermal gradient in these two wells. Temperature log profiles from wells near the Basin center reveal thermal anomalies indicating conditions inconsistent with steady state vertical thermal conduction below the Atoka formation. These anomalies are located around major fault fairways and provide potential evidence for fluid flow and/or refraction of thermal energy. Within the Basin center, the Spiro and Cromwell Sandstones are geothermal reservoirs of interest as they are thick, aerially extensive, have moderate to good porosity, and are at depths suitable for low temperature geothermal power (~80 °C). More detailed structural analysis, aided by two dimensional modeling is needed to further assess the geothermal potential in the area.

Subjects/Keywords: Heat Flow; Thermal Gradient; Geothermal; Arkoma Basin; Temperature log

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APA (6^th Edition):

Freeman, M. (2013). Evaluation of thermal insulation by coal beds in the western Arkoma Basin, OK and implications for large scale geothermal resources. (Masters Thesis). Louisiana State University. Retrieved from etd-05092013-212420 ; https://digitalcommons.lsu.edu/gradschool_theses/593

Chicago Manual of Style (16^th Edition):

Freeman, Matthew. “Evaluation of thermal insulation by coal beds in the western Arkoma Basin, OK and implications for large scale geothermal resources.” 2013. Masters Thesis, Louisiana State University. Accessed March 01, 2021. etd-05092013-212420 ; https://digitalcommons.lsu.edu/gradschool_theses/593.

MLA Handbook (7^th Edition):

Freeman, Matthew. “Evaluation of thermal insulation by coal beds in the western Arkoma Basin, OK and implications for large scale geothermal resources.” 2013. Web. 01 Mar 2021.

Vancouver:

Freeman M. Evaluation of thermal insulation by coal beds in the western Arkoma Basin, OK and implications for large scale geothermal resources. [Internet] [Masters thesis]. Louisiana State University; 2013. [cited 2021 Mar 01]. Available from: etd-05092013-212420 ; https://digitalcommons.lsu.edu/gradschool_theses/593.

Council of Science Editors:

Freeman M. Evaluation of thermal insulation by coal beds in the western Arkoma Basin, OK and implications for large scale geothermal resources. [Masters Thesis]. Louisiana State University; 2013. Available from: etd-05092013-212420 ; https://digitalcommons.lsu.edu/gradschool_theses/593

University of Maryland

13. Wolfram, Christopher James. Analysis of Flow-Based Microfluidic Gradient Generators for the Study of Bacterial Chemotaxis.

Degree: Material Science and Engineering, 2015, University of Maryland

URL: http://hdl.handle.net/1903/16455

► Chemotaxis is a phenomenon which enables cells to sense concentrations of certain chemical species in their microenvironment and move towards chemically favorable regions. This behavior… (more)

Subjects/Keywords: Biomedical engineering; Microbiology; bacteria; chemotaxis; coli; flow; gradient; microfluidic

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

APA (6^th Edition):

Wolfram, C. J. (2015). Analysis of Flow-Based Microfluidic Gradient Generators for the Study of Bacterial Chemotaxis. (Thesis). University of Maryland. Retrieved from http://hdl.handle.net/1903/16455

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):

Wolfram, Christopher James. “Analysis of Flow-Based Microfluidic Gradient Generators for the Study of Bacterial Chemotaxis.” 2015. Thesis, University of Maryland. Accessed March 01, 2021. http://hdl.handle.net/1903/16455.

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

MLA Handbook (7^th Edition):

Wolfram, Christopher James. “Analysis of Flow-Based Microfluidic Gradient Generators for the Study of Bacterial Chemotaxis.” 2015. Web. 01 Mar 2021.

Vancouver:

Wolfram CJ. Analysis of Flow-Based Microfluidic Gradient Generators for the Study of Bacterial Chemotaxis. [Internet] [Thesis]. University of Maryland; 2015. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1903/16455.

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

Council of Science Editors:

Wolfram CJ. Analysis of Flow-Based Microfluidic Gradient Generators for the Study of Bacterial Chemotaxis. [Thesis]. University of Maryland; 2015. Available from: http://hdl.handle.net/1903/16455

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

Utah State University

14. Pickett, Ethan. The Short and Long-Term Effects of Temperature and Strain on a Concrete Bulb-Tree Girder Bridge.

Degree: MS, Civil and Environmental Engineering, 2017, Utah State University

URL: https://digitalcommons.usu.edu/etd/5811

► The Utah Transportation Center (UTC) as well as the Mountain Plains Consortium, sponsored a study to investigate the long-term performance of a deck bulb… (more)

▼ The Utah Transportation Center (UTC) as well as the Mountain Plains Consortium, sponsored a study to investigate the long-term performance of a deck bulb tee girder bridge. The bridge in question is located in Nibley, Utah and was erected in early 2016. Temperature and prestress losses were analyzed from embedded instrumentation placed within two of the bridge girders before casting. These two girders contained a total of 50 thermocouples and 16 vibrating wire strain gauges. These instruments were placed at the mid-span and end of an exterior girder and the mid-span, quarter-span, and end of a center girder in order to effectively monitor the bridge response in one quarter of the bridge superstructure. The monitoring performed with the thermocouples included the temperature of the girders during curing, weekly maximum and minimum temperatures compared to methods for predicting the average bridge temperature, maximum and minimum thermal gradients at each of the five selected cross sections compared to Code thermal gradients, and thermal camber by measured temperature compared to models to predict thermal gradients. The 16 strain gauges measured prestress losses at four girder cross-sections, which were compared to two predictive methods provided by AASHTO as well as a method by PCI. An additional comparison of the equations provided by AASHTO and a newly available equation used for determining the modulus of elasticity of concretes with a compressive strength of 6,000 – 12,000 psi was performed. Additional exterior instrumentation were provided by Bridge Diagnostics Inc. (BDI) in order to monitor short-term changes within the bridge. A total of 8 strain gauges were attached to the exterior of the girders with 6 attached at the bottom face of 6 girders and 2 attached at the centroid of 2 girders. These sensors as well as the software and wireless data acquisition provided a method to measure the magnitude and frequency of the ranges of strain experienced by the Nibley Bridge. Advisors/Committee Members: Paul J. Barr, ;.

Subjects/Keywords: Strain; Gradient; Camber; Prestress; Rain Flow; Civil and Environmental Engineering; Engineering

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APA (6^th Edition):

Pickett, E. (2017). The Short and Long-Term Effects of Temperature and Strain on a Concrete Bulb-Tree Girder Bridge. (Masters Thesis). Utah State University. Retrieved from https://digitalcommons.usu.edu/etd/5811

Chicago Manual of Style (16^th Edition):

Pickett, Ethan. “The Short and Long-Term Effects of Temperature and Strain on a Concrete Bulb-Tree Girder Bridge.” 2017. Masters Thesis, Utah State University. Accessed March 01, 2021. https://digitalcommons.usu.edu/etd/5811.

MLA Handbook (7^th Edition):

Pickett, Ethan. “The Short and Long-Term Effects of Temperature and Strain on a Concrete Bulb-Tree Girder Bridge.” 2017. Web. 01 Mar 2021.

Vancouver:

Pickett E. The Short and Long-Term Effects of Temperature and Strain on a Concrete Bulb-Tree Girder Bridge. [Internet] [Masters thesis]. Utah State University; 2017. [cited 2021 Mar 01]. Available from: https://digitalcommons.usu.edu/etd/5811.

Council of Science Editors:

Pickett E. The Short and Long-Term Effects of Temperature and Strain on a Concrete Bulb-Tree Girder Bridge. [Masters Thesis]. Utah State University; 2017. Available from: https://digitalcommons.usu.edu/etd/5811

Université Paris-Sud – Paris XI

15. Roudneff, Aude. Modelisation macroscopique de mouvements de foule : Macroscopic modelling of crowd motion.

Degree: Docteur es, Mathématiques, 2011, Université Paris-Sud – Paris XI

URL: http://www.theses.fr/2011PA112304

►

Nous étudions dans ce travail les mouvements de foule intervenant dans les situa- tions d’urgence. Nous proposons un modèle macroscopique (la foule est représentée par… (more)

▼

Nous étudions dans ce travail les mouvements de foule intervenant dans les situa- tions d’urgence. Nous proposons un modèle macroscopique (la foule est représentée par une densité de personnes) obéissant à deux principes très simples. Tout d’abord, chaque personne possède une vitesse souhaitée (typiquement celle qui la mène vers la sortie), qu’elle adopterait en l’absence des autres. Ensuite, la foule doit respecter une contrainte de congestion, et la densité de personnes doit rester inférieure à une valeur ﬁxée. Cette contrainte impose une vitesse de déplacement différente de la vitesse souhaitée. Nous choisissons de prendre comme vitesse réelle celle qui est la plus proche, au sens des moindres carrés, de la vitesse souhaitée, parmi les champs de vitesses admissibles, au sens où ils respectent la contrainte de densité maximale. Le modèle obtenu s’écrit sous la forme d’une équation de transport impliquant une vitesse peu régulière a priori, et qui ne peut être étudiée par des méthodes classiques. Nous démontrons un résultat d’existence grâce à la théorie du transport optimal, tout d’abord dans le cas d’une vitesse donnée comme le gradient d’une fonction, puis dans le cas général. Nous mettons également en œuvre un schéma numérique de type catching-up : à chaque pas de temps, la densité est déplacée selon le champ de vitesse souhaitée, puis est projetée sur l’ensemble des densités admissibles. Les résultats obtenus fournissent des temps d’évacuation dont l’ordre de grandeur est proche de la réalité.

In this work, we aim at modelling crowd motion in emergency situations. We propose a macroscopic model (where people are represented as a density) following two basic principles. First, each individual has a spontaneous velocity (typically, the one which leads to the nearest exit) which would be fulﬁlled in the absence of other people. On the other hand, the crowd has to respect a congestion constraint, and its density must remain underneath a critical density. This constraint prevents people from following their desired velocity. The actual velocity we consider is the closest, in a mean square sense, to the desired one, among the velocities which respect the maximal density constraint.The mathematical formulation writes as a transport equation which cannot be studied with classical methods, since the real velocity ﬁeld has no a priori regularity, even if the desired velocity is smooth. Thanks to the optimal transport theory, we prove an existence result, ﬁrst in the case where the desired velocity is the gradient of a given function, and then in the general framework. We also propose a numerical scheme which follows the catching-up principle: at each time step, we move the density according to the spontaneous velocity, and then project it onto the space of admissible densities. The numerical results we obtain reproduce qualitatively the experimental observations

Advisors/Committee Members: Maury, Bertrand (thesis director).

Subjects/Keywords: Mouvements de foule; Transport optimal; Flot-gradient; Schéma de catching-up; Crowd motion; Optimal transport; Gradient flow; Catching-up scheme

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

APA (6^th Edition):

Roudneff, A. (2011). Modelisation macroscopique de mouvements de foule : Macroscopic modelling of crowd motion. (Doctoral Dissertation). Université Paris-Sud – Paris XI. Retrieved from http://www.theses.fr/2011PA112304

Chicago Manual of Style (16^th Edition):

Roudneff, Aude. “Modelisation macroscopique de mouvements de foule : Macroscopic modelling of crowd motion.” 2011. Doctoral Dissertation, Université Paris-Sud – Paris XI. Accessed March 01, 2021. http://www.theses.fr/2011PA112304.

MLA Handbook (7^th Edition):

Roudneff, Aude. “Modelisation macroscopique de mouvements de foule : Macroscopic modelling of crowd motion.” 2011. Web. 01 Mar 2021.

Vancouver:

Roudneff A. Modelisation macroscopique de mouvements de foule : Macroscopic modelling of crowd motion. [Internet] [Doctoral dissertation]. Université Paris-Sud – Paris XI; 2011. [cited 2021 Mar 01]. Available from: http://www.theses.fr/2011PA112304.

Council of Science Editors:

Roudneff A. Modelisation macroscopique de mouvements de foule : Macroscopic modelling of crowd motion. [Doctoral Dissertation]. Université Paris-Sud – Paris XI; 2011. Available from: http://www.theses.fr/2011PA112304

University of Notre Dame

16. Daniel J. Simmons. An Experimental Investigation of Smooth-Body Flow Separation</h1>.

Degree: Aerospace and Mechanical Engineering, 2020, University of Notre Dame

URL: https://curate.nd.edu/show/zs25x63732m

► The accurate and reliable simulation of smooth-body turbulent flow separation represents a considerable challenge for current CFD turbulence models. Consequently, there has been a… (more)

▼ The accurate and reliable simulation of smooth-body turbulent flow separation represents a considerable challenge for current CFD turbulence models. Consequently, there has been a recent push for high quality, experimental, benchmark flow separation studies to be conducted for the purpose of CFD validation. This dissertation documents a series of benchmark experimental studies on smooth-body flow separation. Three flow experiments are investigated over a single two-dimensional ramp geometry—two undergoing flow separation (one larger-scale and one smaller-scale) and one attached flow—all of which result from a user-imposed adverse pressure gradient (APG) applied to a turbulent boundary layer. These data sets and associated documentation are now available on the NASA Langley Research Center Turbulence Modeling Resource website. Although the geometry and incoming flow in these experiments are spanwise two-dimensional in the mean, oil-film surface flow visualization shows that in each case separation is three-dimensional in character while reattachment is two-dimensional. Utilizing multiple flow visualization images, both surface and off-surface topology maps of separation were created. These maps indicate that the central flow separation is characterized by the owl-face pattern of the fourth kind. It is found that this pattern is an ubiquitous feature of flow separation. Additional investigation revealed that this owl-face pattern is part of a generic and simple structure consisting of a repeating pattern of saddle points and foci for separation and nodes and saddle points for reattachment. The pattern results when the streamwise surface curvature induces a small secondary flow, which interacts with the wind tunnel sidewalls. Furthermore, passive flow control studies reveal that, while the centerline flow separation extent is highly influenced by the sidewall separation, its characteristic separation structure is independent of the sidewall separation. Extensive off-surface flow measurements, conducted via two-component LDV, were used to characterize the streamwise and spanwise flow development. Despite its three-dimensionality, the streamwise mean flow develops in a typical fashion—becoming inflectional due to the imposed streamwise APG—resulting in the formation of an embedded shear layer. Attempts to scale the flow using embedded shear layer scaling highlight that, while the mean profiles exhibit excellent collapse, the scaled turbulent stress profiles do not exhibit collapse due to streamwise surface curvature effects. Furthermore, experimental evidence is provided indicating that the Reynolds stresses are effectively “frozen”, with streamwise changes resulting from a rotating local wall-normal coordinate. A coordinate system fixed at the no-curvature transition from convex to concave ramp curvature yields turbulent shear stress magnitudes that are constant with streamwise development. Advisors/Committee Members: Flint O. Thomas, Research Director.

Subjects/Keywords: attached flow; adverse pressure gradient turbulent boundary layer development; flow separation experiments; CFD validation; owl-face pattern; smooth-body flow separation

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APA (6^th Edition):

Simmons, D. J. (2020). An Experimental Investigation of Smooth-Body Flow Separation</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/zs25x63732m

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):

Simmons, Daniel J.. “An Experimental Investigation of Smooth-Body Flow Separation</h1>.” 2020. Thesis, University of Notre Dame. Accessed March 01, 2021. https://curate.nd.edu/show/zs25x63732m.

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

MLA Handbook (7^th Edition):

Simmons, Daniel J.. “An Experimental Investigation of Smooth-Body Flow Separation</h1>.” 2020. Web. 01 Mar 2021.

Vancouver:

Simmons DJ. An Experimental Investigation of Smooth-Body Flow Separation</h1>. [Internet] [Thesis]. University of Notre Dame; 2020. [cited 2021 Mar 01]. Available from: https://curate.nd.edu/show/zs25x63732m.

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

Council of Science Editors:

Simmons DJ. An Experimental Investigation of Smooth-Body Flow Separation</h1>. [Thesis]. University of Notre Dame; 2020. Available from: https://curate.nd.edu/show/zs25x63732m

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

17. Cuvier, Christophe. Contrôle actif du décollement d’une couche limite turbulente en gradient de pression adverse : Active control of a separated turbulent boundary layer in adverse pressure gradient.

Degree: Docteur es, Mécanique, 2012, Ecole centrale de Lille

URL: http://www.theses.fr/2012ECLI0015

►

Le contrôle d’écoulement permet d’éliminer le phénomène de décollement de couches limites, très néfaste pour les performances des machines interagissant avec un fluide (avions, voitures,… (more)

▼

Le contrôle d’écoulement permet d’éliminer le phénomène de décollement de couches limites, très néfaste pour les performances des machines interagissant avec un fluide (avions, voitures, turbomachines ...). Ces travaux s’intéressent plus particulièrement au contrôle actif d’écoulement au moyen de jets continus. Une maquette permettant de manipuler l’équilibre de la couche limite a été conçue et installée dans la soufflerie du Laboratoire de Mécanique de Lille. La première partie du travail a consisté en la caractérisation de l’écoulement autour du modèle à l’aide de visualisations par fils de laine et par enduit gras, de mesures de répartition de pression, de mesures par anémométrie à fils chauds et par PIV. Ceci a permis de définir la configuration du modèle la plus appropriée pour les études de contrôle mais aussi de connaître précisément les caractéristiques de l’écoulement sélectionné. La configuration retenue correspond à un écoulement en gradient de pression adverse suivi d’une séparation sur le volet, un peu comme sur l’extrados d’une aile d’avion. L’utilisation de sondes de frottement associées à des visualisations aux fils de laine ont permis d’étudier et d’optimiser des actionneurs passifs, puis des actionneurs à jets continus. Certaines des configurations actives optimales ont ensuite été caractérisées plus en détail par une mesure par PIV englobant toute la zone de séparation. Il apparaît que les jets continus ne suppriment pas complètement les mécanismes de la séparation mais réduisent leur intensité et les concentrent plus ou moins près de la paroi

Flow control allows to suppress boundary layers separation, which largely deteriorates the performances of machineries which interact with fluid (aircraft, cars, turbomachineries, etc.). This study concentrates more particularly on active flow control with continuous jets. A ramp model which allows to manipulate the boundary layer equilibrium was realized and set in Laboratoire de Mécanique de Lille wind tunnel. The first part of the work was to characterize the flow over the model with wool-tufts and oil-film visualisations, pressure distribution, hot-wire anemometry and PIV measurements. The aim was to define a ramp configuration for the flow control study and to know precisely the characteristics of the retained flow. The selected configuration corresponds to an adverse pressure gradient flow followed by a separation on the flap, which mimics the flow on the suction side of a wing. With friction probes coupled with wool-tufts visualisations, passive actuators and active continuous jets were studied and optimised. Finally, some of the optimum active configurations found were characterized in more details with PIV measurements over the entire separated region. It appears that continuous jets do not suppress the separation mechanisms, but only reduce their intensity and squeeze them more or less against the wall

Advisors/Committee Members: Stanislas, Michel (thesis director).

Subjects/Keywords: Couche limite; Turbulence; Gradient de pression adverse; PIV; Contrôle d'écoulements; Décollement; Générateurs de vortex; Boundary layer; Turbulence; Adverse pressure gradient; PIV; Flow control; Flow separation; Vortex generators

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

APA (6^th Edition):

Cuvier, C. (2012). Contrôle actif du décollement d’une couche limite turbulente en gradient de pression adverse : Active control of a separated turbulent boundary layer in adverse pressure gradient. (Doctoral Dissertation). Ecole centrale de Lille. Retrieved from http://www.theses.fr/2012ECLI0015

Chicago Manual of Style (16^th Edition):

Cuvier, Christophe. “Contrôle actif du décollement d’une couche limite turbulente en gradient de pression adverse : Active control of a separated turbulent boundary layer in adverse pressure gradient.” 2012. Doctoral Dissertation, Ecole centrale de Lille. Accessed March 01, 2021. http://www.theses.fr/2012ECLI0015.

MLA Handbook (7^th Edition):

Cuvier, Christophe. “Contrôle actif du décollement d’une couche limite turbulente en gradient de pression adverse : Active control of a separated turbulent boundary layer in adverse pressure gradient.” 2012. Web. 01 Mar 2021.

Vancouver:

Cuvier C. Contrôle actif du décollement d’une couche limite turbulente en gradient de pression adverse : Active control of a separated turbulent boundary layer in adverse pressure gradient. [Internet] [Doctoral dissertation]. Ecole centrale de Lille; 2012. [cited 2021 Mar 01]. Available from: http://www.theses.fr/2012ECLI0015.

Council of Science Editors:

Cuvier C. Contrôle actif du décollement d’une couche limite turbulente en gradient de pression adverse : Active control of a separated turbulent boundary layer in adverse pressure gradient. [Doctoral Dissertation]. Ecole centrale de Lille; 2012. Available from: http://www.theses.fr/2012ECLI0015

Universidade do Rio Grande do Norte

18. Nascimento, Julio Cesar Santos. Simulador de escoamento multifásico em poços de petróleo (SEMPP) .

Degree: 2013, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/12980

► The multiphase flow occurrence in the oil and gas industry is common throughout fluid path, production, transportation and refining. The multiphase flow is defined as… (more)

Subjects/Keywords: Escoamento multifásico. Gradiente de pressão. Gradiente de temperatura. Simulador de escoamento multifásico. Correlações empíricas e modelo mecanicista; Multiphase flow. Pressure gradient. Temperature gradient. Multiphase flow simulator. Empirical correlations. Mechanistic model

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

APA (6^th Edition):

Nascimento, J. C. S. (2013). Simulador de escoamento multifásico em poços de petróleo (SEMPP) . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/12980

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):

Nascimento, Julio Cesar Santos. “Simulador de escoamento multifásico em poços de petróleo (SEMPP) .” 2013. Thesis, Universidade do Rio Grande do Norte. Accessed March 01, 2021. http://repositorio.ufrn.br/handle/123456789/12980.

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

MLA Handbook (7^th Edition):

Nascimento, Julio Cesar Santos. “Simulador de escoamento multifásico em poços de petróleo (SEMPP) .” 2013. Web. 01 Mar 2021.

Vancouver:

Nascimento JCS. Simulador de escoamento multifásico em poços de petróleo (SEMPP) . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2013. [cited 2021 Mar 01]. Available from: http://repositorio.ufrn.br/handle/123456789/12980.

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

Council of Science Editors:

Nascimento JCS. Simulador de escoamento multifásico em poços de petróleo (SEMPP) . [Thesis]. Universidade do Rio Grande do Norte; 2013. Available from: http://repositorio.ufrn.br/handle/123456789/12980

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

Universidade do Rio Grande do Norte

19. Nascimento, Julio Cesar Santos. Simulador de escoamento multifásico em poços de petróleo (SEMPP) .

Degree: 2013, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/12980

► The multiphase flow occurrence in the oil and gas industry is common throughout fluid path, production, transportation and refining. The multiphase flow is defined as… (more)

Subjects/Keywords: Escoamento multifásico. Gradiente de pressão. Gradiente de temperatura. Simulador de escoamento multifásico. Correlações empíricas e modelo mecanicista; Multiphase flow. Pressure gradient. Temperature gradient. Multiphase flow simulator. Empirical correlations. Mechanistic model

Record Details Similar Records Cite « Share

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

APA (6^th Edition):

Nascimento, J. C. S. (2013). Simulador de escoamento multifásico em poços de petróleo (SEMPP) . (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/12980

Chicago Manual of Style (16^th Edition):

Nascimento, Julio Cesar Santos. “Simulador de escoamento multifásico em poços de petróleo (SEMPP) .” 2013. Masters Thesis, Universidade do Rio Grande do Norte. Accessed March 01, 2021. http://repositorio.ufrn.br/handle/123456789/12980.

MLA Handbook (7^th Edition):

Nascimento, Julio Cesar Santos. “Simulador de escoamento multifásico em poços de petróleo (SEMPP) .” 2013. Web. 01 Mar 2021.

Vancouver:

Nascimento JCS. Simulador de escoamento multifásico em poços de petróleo (SEMPP) . [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2013. [cited 2021 Mar 01]. Available from: http://repositorio.ufrn.br/handle/123456789/12980.

Council of Science Editors:

Nascimento JCS. Simulador de escoamento multifásico em poços de petróleo (SEMPP) . [Masters Thesis]. Universidade do Rio Grande do Norte; 2013. Available from: http://repositorio.ufrn.br/handle/123456789/12980

Universiteit Utrecht

20. Ardesch, A.R. Flow Separation in Sharp-Bend-Flow.

Degree: 2014, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/301312

► In sharp-bend-flow the hydrodynamic phenomena are different than in straight channel flow. Flow separation and hdelical flow are the most important sharp-bend-flow phenomena and they… (more)

Subjects/Keywords: Flow separation; shear layer; transverse water surface tilt; adverse pressure gradient; Hydralab-III; LS-PIV

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

APA (6^th Edition):

Ardesch, A. R. (2014). Flow Separation in Sharp-Bend-Flow. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/301312

Chicago Manual of Style (16^th Edition):

Ardesch, A R. “Flow Separation in Sharp-Bend-Flow.” 2014. Masters Thesis, Universiteit Utrecht. Accessed March 01, 2021. http://dspace.library.uu.nl:8080/handle/1874/301312.

MLA Handbook (7^th Edition):

Ardesch, A R. “Flow Separation in Sharp-Bend-Flow.” 2014. Web. 01 Mar 2021.

Vancouver:

Ardesch AR. Flow Separation in Sharp-Bend-Flow. [Internet] [Masters thesis]. Universiteit Utrecht; 2014. [cited 2021 Mar 01]. Available from: http://dspace.library.uu.nl:8080/handle/1874/301312.

Council of Science Editors:

Ardesch AR. Flow Separation in Sharp-Bend-Flow. [Masters Thesis]. Universiteit Utrecht; 2014. Available from: http://dspace.library.uu.nl:8080/handle/1874/301312

21. Asgari Kaji, Mohammad H. Turbulent Structure in Open Channel Flow.

Degree: MA, Civil and Environmental Engineering, 2013, National Library of Canada

URL: http://scholar.uwindsor.ca/etd/4887

► This thesis investigates the effects of pressure gradient and roughness on the mean and turbulence characteristics in non-uniform open channel flow. The flow and… (more)

Subjects/Keywords: Applied sciences; Nonuniform; Open channel flow; Pressure gradient; Roughness; Turbulence; Civil and Environmental Engineering; Engineering

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

APA (6^th Edition):

Asgari Kaji, M. H. (2013). Turbulent Structure in Open Channel Flow. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/4887

Chicago Manual of Style (16^th Edition):

Asgari Kaji, Mohammad H. “Turbulent Structure in Open Channel Flow.” 2013. Masters Thesis, National Library of Canada. Accessed March 01, 2021. http://scholar.uwindsor.ca/etd/4887.

MLA Handbook (7^th Edition):

Asgari Kaji, Mohammad H. “Turbulent Structure in Open Channel Flow.” 2013. Web. 01 Mar 2021.

Vancouver:

Asgari Kaji MH. Turbulent Structure in Open Channel Flow. [Internet] [Masters thesis]. National Library of Canada; 2013. [cited 2021 Mar 01]. Available from: http://scholar.uwindsor.ca/etd/4887.

Council of Science Editors:

Asgari Kaji MH. Turbulent Structure in Open Channel Flow. [Masters Thesis]. National Library of Canada; 2013. Available from: http://scholar.uwindsor.ca/etd/4887

University of Manchester

22. Alhendal, Yousuf A. Computational Two Phase Marangoni Flow in a Microgravity Environment.

Degree: 2013, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:211983

►

The lack of significant buoyancy effects in zero-gravity conditions poses an issue with fluid transfer in a stagnant liquid. In this thesis, the movement of… (more)

▼

The lack of significant buoyancy effects in zero-gravity conditions poses an issue with fluid transfer in a stagnant liquid. In this thesis, the movement of a bubble or droplet in both stagnant and rotating liquids is analysed and presented numerically using computational fluid dynamics (CFD). The governing continuum conservation equations for two-phase flow are solved using the commercial software package (2011). The Volume of Fluid (VOF) method is used to track the liquid/gas interface in 2D and 3D domains. User-Defined Functions (UDFs) are employed in order to include the effect of surface tension gradient and fluid properties as a function of temperature, with a view to efficiently investigating temperature effects on the properties of the two phases. The flow is driven via Marangoni influence induced by the surface tension gradient, which in turn drives the bubble/droplet from the cold to the hot region. For stationary liquid, the results indicate that the scaled velocity of the bubble decreases with an increase in the Marangoni number, which agrees with the results of previous space experiments. An expression for predicting the scaled velocity of a bubble has been regressed based on the obtained data from the present numerical study for thermal Marangoni numbers up to 10,721. An expression for predicting the scaled velocity of a Fluorinert droplet migrating in oil has also been presented for an MaT range from 24.05 to 2771. The interactions of two droplets in thermocapillary motion have also been studied and compared with the results obtained for the isolated droplet. The results have shown that the leading droplet will not move faster than if it were isolated, as the trailing droplet has no influence on the velocity of the leading droplet. Three-dimensional results show that no bubbles broke in any of the cases observed and agglomeration could occur during thermocapillary migration for bubbles placed side by side. The results of the motion of a singular and multiple bubbles incorporating thermocapillary forces in a rotating liquid in a zero-gravity environment have been presented for the first time. When the Rossby number is 1, the effects of rotation are important. Furthermore, the deflection of the gas bubble motion increases towards the axis of rotation with a decrease in the Rossby number (Ro). Bubble population balance modelling has been investigated in normal gravity using Luo kernels for breakage and agglomeration and two different laminar kernels for zero-gravity conditions. The simulations covered a wide range of scenarios and results are presented as a bell and histogram shapes for number density and particle percentage distribution, respectively.

The present CFD results show that different temperature gradients lead to different droplet migration velocities, and it was proven that bubble migration velocity varies linearly with the temperature gradient for the given conditions. An expression for predicting the scaled velocity of a bubble has been derived based on the data obtained in the present…

Advisors/Committee Members: Turan, Ali.

Subjects/Keywords: Two Phase; Bubbles/droplets; Surface tension gradient; Marangoni flow; Thermocapillary; Rotation; Two bubble interaction

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

APA (6^th Edition):

Alhendal, Y. A. (2013). Computational Two Phase Marangoni Flow in a Microgravity Environment. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:211983

Chicago Manual of Style (16^th Edition):

Alhendal, Yousuf A. “Computational Two Phase Marangoni Flow in a Microgravity Environment.” 2013. Doctoral Dissertation, University of Manchester. Accessed March 01, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:211983.

MLA Handbook (7^th Edition):

Alhendal, Yousuf A. “Computational Two Phase Marangoni Flow in a Microgravity Environment.” 2013. Web. 01 Mar 2021.

Vancouver:

Alhendal YA. Computational Two Phase Marangoni Flow in a Microgravity Environment. [Internet] [Doctoral dissertation]. University of Manchester; 2013. [cited 2021 Mar 01]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:211983.

Council of Science Editors:

Alhendal YA. Computational Two Phase Marangoni Flow in a Microgravity Environment. [Doctoral Dissertation]. University of Manchester; 2013. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:211983

University of Plymouth

23. Capponi, Francesco. Renormalized energy momentum tensor from the Gradient Flow.

Degree: PhD, 2017, University of Plymouth

URL: http://hdl.handle.net/10026.1/8598

► Strongly coupled systems are elusive and not suitable to be described by conventional perturbative approaches. However, they are ubiquitous in nature, especially in particle physics.… (more)

Subjects/Keywords: 530.14; Lattice; EMT; gradient flow; Renormalization group; non perturbative renormalization; Ward Identities

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APA (6^th Edition):

Capponi, F. (2017). Renormalized energy momentum tensor from the Gradient Flow. (Doctoral Dissertation). University of Plymouth. Retrieved from http://hdl.handle.net/10026.1/8598

Chicago Manual of Style (16^th Edition):

Capponi, Francesco. “Renormalized energy momentum tensor from the Gradient Flow.” 2017. Doctoral Dissertation, University of Plymouth. Accessed March 01, 2021. http://hdl.handle.net/10026.1/8598.

MLA Handbook (7^th Edition):

Capponi, Francesco. “Renormalized energy momentum tensor from the Gradient Flow.” 2017. Web. 01 Mar 2021.

Vancouver:

Capponi F. Renormalized energy momentum tensor from the Gradient Flow. [Internet] [Doctoral dissertation]. University of Plymouth; 2017. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/10026.1/8598.

Council of Science Editors:

Capponi F. Renormalized energy momentum tensor from the Gradient Flow. [Doctoral Dissertation]. University of Plymouth; 2017. Available from: http://hdl.handle.net/10026.1/8598

University of Oxford

24. van Wyk, Ferdinand. Subcritical turbulence in the Mega Ampere Spherical Tokamak.

Degree: PhD, 2016, University of Oxford

URL: https://ora.ox.ac.uk/objects/uuid:6d84d615-d8dc-45e6-8920-0d71053a13db ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.735878

► The transport of heat out of tokamak plasmas by turbulence is the dominant mechanism limiting the performance of fusion reactors. Turbulence can be driven by… (more)

▼ The transport of heat out of tokamak plasmas by turbulence is the dominant mechanism limiting the performance of fusion reactors. Turbulence can be driven by the ion temperature gradient (ITG) and suppressed by toroidal equilibrium scale sheared flows. Numerical simulations attempting to understand, and ultimately reduce, turbulence are crucial for guiding the design and optimisation of future reactors. In this thesis, we investigate ion-scale turbulence by means of local gyrokinetic simulations in the outer core of the Mega Ampere Spherical Tokamak (MAST).We perform a parameter scan in the values of the ITG and the flow shear. We show that nonlinear simulations reproduce the experimental ion heat flux and that the experimentally measured values of the ITG and the flow shear lie close to the turbulence threshold. We demonstrate that the system is subcritical in the presence of flow shear, i.e., the system is formally stable to small perturbations, but transitions to a turbulent state given a large enough initial perturbation. We propose a scenario for the transition to subcritical turbulence previously unreported in tokamak plasmas: close to the threshold, the plasma is dominated by a low number of coherent long-lived structures; as the system is taken away from the threshold into the more unstable regime, the number of these structures increases until they fill the domain and a more conventional turbulence emerges. We make quantitative comparisons of correlation properties between our simulations and experimental measurements of ion-scale density fluctuations from the MAST BES diagnostic. We apply a synthetic diagnostic to our simulation data and find reasonable agreement of the correlation properties of the simulated and experimental turbulence, most notably of the correlation time, for which significant discrepancies were found in previous numerical studies of MAST turbulence. We show that the properties of turbulence are essentially functions of the distance to threshold, as quantified by the ion heat flux. We find that turbulence close to the threshold is strongly affected by flow shear, whereas far from threshold, the turbulence resembles a conventional ITG-driven, zonal-flow damped regime.

Subjects/Keywords: 621.48; Fusion; Plasma Physics; Subcritical Turbulence; fusion; flow shear; ion temperature gradient; plasma; turbulence; subcritical

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

APA (6^th Edition):

van Wyk, F. (2016). Subcritical turbulence in the Mega Ampere Spherical Tokamak. (Doctoral Dissertation). University of Oxford. Retrieved from https://ora.ox.ac.uk/objects/uuid:6d84d615-d8dc-45e6-8920-0d71053a13db ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.735878

Chicago Manual of Style (16^th Edition):

van Wyk, Ferdinand. “Subcritical turbulence in the Mega Ampere Spherical Tokamak.” 2016. Doctoral Dissertation, University of Oxford. Accessed March 01, 2021. https://ora.ox.ac.uk/objects/uuid:6d84d615-d8dc-45e6-8920-0d71053a13db ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.735878.

MLA Handbook (7^th Edition):

van Wyk, Ferdinand. “Subcritical turbulence in the Mega Ampere Spherical Tokamak.” 2016. Web. 01 Mar 2021.

Vancouver:

van Wyk F. Subcritical turbulence in the Mega Ampere Spherical Tokamak. [Internet] [Doctoral dissertation]. University of Oxford; 2016. [cited 2021 Mar 01]. Available from: https://ora.ox.ac.uk/objects/uuid:6d84d615-d8dc-45e6-8920-0d71053a13db ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.735878.

Council of Science Editors:

van Wyk F. Subcritical turbulence in the Mega Ampere Spherical Tokamak. [Doctoral Dissertation]. University of Oxford; 2016. Available from: https://ora.ox.ac.uk/objects/uuid:6d84d615-d8dc-45e6-8920-0d71053a13db ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.735878

University of Manchester

25. Alhendal, Yousuf A. Computational two phase Marangoni flow in a microgravity environment.

Degree: PhD, 2013, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/computational-two-phase-marangoni-flow-in-a-microgravity-environment(a3ba6f7f-f619-4bae-a355-e7b007d97e13).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607015

► The lack of significant buoyancy effects in zero-gravity conditions poses an issue with fluid transfer in a stagnant liquid. In this thesis, the movement of… (more)

▼ The lack of significant buoyancy effects in zero-gravity conditions poses an issue with fluid transfer in a stagnant liquid. In this thesis, the movement of a bubble or droplet in both stagnant and rotating liquids is analysed and presented numerically using computational fluid dynamics (CFD). The governing continuum conservation equations for two-phase flow are solved using the commercial software package (2011). The Volume of Fluid (VOF) method is used to track the liquid/gas interface in 2D and 3D domains. User-Defined Functions (UDFs) are employed in order to include the effect of surface tension gradient and fluid properties as a function of temperature, with a view to efficiently investigating temperature effects on the properties of the two phases. The flow is driven via Marangoni influence induced by the surface tension gradient, which in turn drives the bubble/droplet from the cold to the hot region. For stationary liquid, the results indicate that the scaled velocity of the bubble decreases with an increase in the Marangoni number, which agrees with the results of previous space experiments. An expression for predicting the scaled velocity of a bubble has been regressed based on the obtained data from the present numerical study for thermal Marangoni numbers up to 10,721. An expression for predicting the scaled velocity of a Fluorinert droplet migrating in oil has also been presented for an MaT range from 24.05 to 2771. The interactions of two droplets in thermocapillary motion have also been studied and compared with the results obtained for the isolated droplet. The results have shown that the leading droplet will not move faster than if it were isolated, as the trailing droplet has no influence on the velocity of the leading droplet. Three-dimensional results show that no bubbles broke in any of the cases observed and agglomeration could occur during thermocapillary migration for bubbles placed side by side. The results of the motion of a singular and multiple bubbles incorporating thermocapillary forces in a rotating liquid in a zero-gravity environment have been presented for the first time. When the Rossby number is 1, the effects of rotation are important. Furthermore, the deflection of the gas bubble motion increases towards the axis of rotation with a decrease in the Rossby number (Ro). Bubble population balance modelling has been investigated in normal gravity using Luo kernels for breakage and agglomeration and two different laminar kernels for zero-gravity conditions. The simulations covered a wide range of scenarios and results are presented as a bell and histogram shapes for number density and particle percentage distribution, respectively.

Subjects/Keywords: 621.402; Two Phase; Bubbles/droplets; Surface tension gradient; Marangoni flow; Thermocapillary; Rotation; Two bubble interaction

Record Details Similar Records Cite « Share

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

APA (6^th Edition):

Alhendal, Y. A. (2013). Computational two phase Marangoni flow in a microgravity environment. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/computational-two-phase-marangoni-flow-in-a-microgravity-environment(a3ba6f7f-f619-4bae-a355-e7b007d97e13).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607015

Chicago Manual of Style (16^th Edition):

Alhendal, Yousuf A. “Computational two phase Marangoni flow in a microgravity environment.” 2013. Doctoral Dissertation, University of Manchester. Accessed March 01, 2021. https://www.research.manchester.ac.uk/portal/en/theses/computational-two-phase-marangoni-flow-in-a-microgravity-environment(a3ba6f7f-f619-4bae-a355-e7b007d97e13).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607015.

MLA Handbook (7^th Edition):

Alhendal, Yousuf A. “Computational two phase Marangoni flow in a microgravity environment.” 2013. Web. 01 Mar 2021.

Vancouver:

Alhendal YA. Computational two phase Marangoni flow in a microgravity environment. [Internet] [Doctoral dissertation]. University of Manchester; 2013. [cited 2021 Mar 01]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/computational-two-phase-marangoni-flow-in-a-microgravity-environment(a3ba6f7f-f619-4bae-a355-e7b007d97e13).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607015.

Council of Science Editors:

Alhendal YA. Computational two phase Marangoni flow in a microgravity environment. [Doctoral Dissertation]. University of Manchester; 2013. Available from: https://www.research.manchester.ac.uk/portal/en/theses/computational-two-phase-marangoni-flow-in-a-microgravity-environment(a3ba6f7f-f619-4bae-a355-e7b007d97e13).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607015

University of Notre Dame

26. Ankit Rohatgi. Shear-Induced Diffusion in Dilute Suspensions</h1>.

Degree: Chemical Engineering, 2012, University of Notre Dame

URL: https://curate.nd.edu/show/hm50tq59w4w

► The particle and fluid interactions that occur in dilute suspensions of non-colloidal particles in shear flow are examined in this thesis. In the theoretical… (more)

Subjects/Keywords: suspensions; creeping flow; shear-induced migration; gradient diffusivity; fluid dispersivity; self-diffusivity; diffusion; noncolloidal; settling

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

APA (6^th Edition):

Rohatgi, A. (2012). Shear-Induced Diffusion in Dilute Suspensions</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/hm50tq59w4w

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):

Rohatgi, Ankit. “Shear-Induced Diffusion in Dilute Suspensions</h1>.” 2012. Thesis, University of Notre Dame. Accessed March 01, 2021. https://curate.nd.edu/show/hm50tq59w4w.

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

MLA Handbook (7^th Edition):

Rohatgi, Ankit. “Shear-Induced Diffusion in Dilute Suspensions</h1>.” 2012. Web. 01 Mar 2021.

Vancouver:

Rohatgi A. Shear-Induced Diffusion in Dilute Suspensions</h1>. [Internet] [Thesis]. University of Notre Dame; 2012. [cited 2021 Mar 01]. Available from: https://curate.nd.edu/show/hm50tq59w4w.

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

Council of Science Editors:

Rohatgi A. Shear-Induced Diffusion in Dilute Suspensions</h1>. [Thesis]. University of Notre Dame; 2012. Available from: https://curate.nd.edu/show/hm50tq59w4w

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

Georgia Tech

27. Li, Wuchen. A study of stochastic differential equations and Fokker-Planck equations with applications.

Degree: PhD, Mathematics, 2016, Georgia Tech

URL: http://hdl.handle.net/1853/54999

► Fokker-Planck equations, along with stochastic differential equations, play vital roles in physics, population modeling, game theory and optimization (finite or infinite dimensional). In this thesis,… (more)

Subjects/Keywords: Stochastic differential equations; Fokker-Planck equations; Gradient flow; Optimal control; Optimal transport

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APA (6^th Edition):

Li, W. (2016). A study of stochastic differential equations and Fokker-Planck equations with applications. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/54999

Chicago Manual of Style (16^th Edition):

Li, Wuchen. “A study of stochastic differential equations and Fokker-Planck equations with applications.” 2016. Doctoral Dissertation, Georgia Tech. Accessed March 01, 2021. http://hdl.handle.net/1853/54999.

MLA Handbook (7^th Edition):

Li, Wuchen. “A study of stochastic differential equations and Fokker-Planck equations with applications.” 2016. Web. 01 Mar 2021.

Vancouver:

Li W. A study of stochastic differential equations and Fokker-Planck equations with applications. [Internet] [Doctoral dissertation]. Georgia Tech; 2016. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/1853/54999.

Council of Science Editors:

Li W. A study of stochastic differential equations and Fokker-Planck equations with applications. [Doctoral Dissertation]. Georgia Tech; 2016. Available from: http://hdl.handle.net/1853/54999

Colorado School of Mines

28. Nopranda, Theoza. Color-gradient lattice Boltzmann model for 3D multiphase flows with density ratios.

Degree: MS(M.S.), Petroleum Engineering, 2020, Colorado School of Mines

URL: http://hdl.handle.net/11124/174058

► In recent years, the interest on lattice Boltzmann (LB) methods for simulation of fluid flows is increasing. The reason for this increasing interest is the… (more)

▼ In recent years, the interest on lattice Boltzmann (LB) methods for simulation of fluid flows is increasing. The reason for this increasing interest is the capability of LB methods to simulate flows in complex geometries such as porous media. The explicitness of the governing equations is also one of the advantages of this method that facilitates parallelization to reduce computational time. With the success of single-phase LB methods, some researchers developed models that can handle multiphase flows. One of them is the color-gradient model. The color-gradient model can successfully simulate multiphase flows with various viscosity ratios. For systems with density ratios not equal to or near unity, however, it contains errors that were reported in several studies. Ba et al. (2016) presented a color-gradient model that can simulate systems with density ratios for D2Q9 (two dimensions and nine velocities) LB model by modifying the equilibrium distribution function and introducing source terms into multi-relaxation collision to rigorously recover Navier-Stokes Equations (NSEs). In this study, I expanded the 2D procedure from Ba et al. (2016) to 3D systems that use the D3Q19 (three dimensions nineteen velocities) LB model. A new equilibrium distribution function and additional source terms in multi-relaxation collision were derived. This new model was validated with three cases with known analytical solutions, namely two-phase Poiseuille flow between two parallel plates, a static droplet, and deformation of a single droplet in Couette flows. Results from the first case showed clear improvements in the velocity profile. Results from the second case demonstrated the model’s capability to recover Young-Laplace equations. Results from the third case proved the accuracy of the model in a flowing system with a steadily deformed interface; the deformation is correlated to the interfacial tension between the two phases and the viscosities. With this validated model, a simulation in a small porous medium was run to prove the capability of this new model in a complex geometry. This model captured several phenomena inside the porous medium such as the effect of wettability on the shape of droplets and interfaces, pressure distribution, formation of segmented flows at Y-junctions, gas channeling, and Plateau-Rayleigh instability. Advisors/Committee Members: Yin, Xiaolong (advisor), Fan, Yilin (committee member), Kazemi, Hossein (committee member).

Subjects/Keywords: fluid dynamics; multiphase flow; color-gradient LBM; pore-scale simulation; Lattice-Boltzmann methods

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

APA (6^th Edition):

Nopranda, T. (2020). Color-gradient lattice Boltzmann model for 3D multiphase flows with density ratios. (Masters Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/174058

Chicago Manual of Style (16^th Edition):

Nopranda, Theoza. “Color-gradient lattice Boltzmann model for 3D multiphase flows with density ratios.” 2020. Masters Thesis, Colorado School of Mines. Accessed March 01, 2021. http://hdl.handle.net/11124/174058.

MLA Handbook (7^th Edition):

Nopranda, Theoza. “Color-gradient lattice Boltzmann model for 3D multiphase flows with density ratios.” 2020. Web. 01 Mar 2021.

Vancouver:

Nopranda T. Color-gradient lattice Boltzmann model for 3D multiphase flows with density ratios. [Internet] [Masters thesis]. Colorado School of Mines; 2020. [cited 2021 Mar 01]. Available from: http://hdl.handle.net/11124/174058.

Council of Science Editors:

Nopranda T. Color-gradient lattice Boltzmann model for 3D multiphase flows with density ratios. [Masters Thesis]. Colorado School of Mines; 2020. Available from: http://hdl.handle.net/11124/174058

Cranfield University

29. Aliyu, A. M. Vertical annular gas–liquid two-phase flow in large diameter pipes.

Degree: PhD, 2015, Cranfield University

URL: http://dspace.lib.cranfield.ac.uk/handle/1826/9848

► Gas–liquid annular two phase flow in pipes is important in the oil and gas, nuclear and the process industries. It has been identified as one… (more)

Subjects/Keywords: Adiabatic two-phase flow; Entrained droplet fraction; Falling films; Interfacial friction factor; Multiphase flow; Pressure gradient

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

APA (6^th Edition):

Aliyu, A. M. (2015). Vertical annular gas–liquid two-phase flow in large diameter pipes. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/9848

Chicago Manual of Style (16^th Edition):

Aliyu, A M. “Vertical annular gas–liquid two-phase flow in large diameter pipes.” 2015. Doctoral Dissertation, Cranfield University. Accessed March 01, 2021. http://dspace.lib.cranfield.ac.uk/handle/1826/9848.

MLA Handbook (7^th Edition):

Aliyu, A M. “Vertical annular gas–liquid two-phase flow in large diameter pipes.” 2015. Web. 01 Mar 2021.

Vancouver:

Aliyu AM. Vertical annular gas–liquid two-phase flow in large diameter pipes. [Internet] [Doctoral dissertation]. Cranfield University; 2015. [cited 2021 Mar 01]. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/9848.

Council of Science Editors:

Aliyu AM. Vertical annular gas–liquid two-phase flow in large diameter pipes. [Doctoral Dissertation]. Cranfield University; 2015. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/9848

Cranfield University

30. Al-Awadi, Hameed. Multiphase characteristics of high viscosity oil.

Degree: 2011, Cranfield University

URL: http://dspace.lib.cranfield.ac.uk/handle/1826/13902

► Heavy oil production has drawn more and more attention in petroleum industry. The amount of heavy oil in the world is twice more than the… (more)

▼ Heavy oil production has drawn more and more attention in petroleum industry. The amount of heavy oil in the world is twice more than the conventional oil (low viscosity), which has been consumed rapidly from the past. The understanding of flow patterns and pressure losses in multiphase flow with high viscosity oil are vital to assist the design of transportation pipeline. This thesis involves experimental investigation of two phase and three phase flows under high oil viscosity conditions (up to 17000cP) in horizontal pipelines. The multiphase (oil/water/solid/gas) facility was designed and constructed at Cranfield University and consists of 6m long horizontal pipeline of 0.026m diameter along with instrumentations. The principal objectives of the work were to study the effect of viscosity, water cut, temperature variance, and flow conditions on flow patterns and pressure drops for (oil/gas and oil/water) two phase flows; to compare the measured flow parameters and phase distribution with those predicted from models found in the literature for two phase flows; and to conduct an experimental study of gas injection effect on pressure gradient in (oil/water/gas) three phase flow. Due to the nature of heavy oil reservoirs, sand is associated with oil/water mixture when extracted; therefore sand concentration effect on pressure drop in (oil/water/sand) three phase flow is also examined. For oil-air flow, a smooth oil coating was observed in the film region of slug flow, while a ripple structure of oil coating film was found at higher superficial air velocity for slug flow regime and annular flow regime. The ripple structure was believed to increase the effective roughness of the pipe wall, which resulted in higher pressure gradients. The pressure drop correlations from Beggs and Brill (1973) and Dukler et al. (1964) were used to compare with experimental pressure gradients for oil/air flow. It was found that these correlations failed to predict the pressure gradients for heavy oil/air flows in this work. Several new heavy oil/water flow patterns were named and categorized based on observations. Though the heavy oil viscosity is an essential parameter for oil continuous phase flow on pressure drop, it had no significant effect beyond Water Assist Flow (WAF) condition, as a threshold was found for water cut with fixed superficial oil velocity. The transition criterion by McKibben et al. (2000b) for WAF was found to be able to predict this threshold reasonably well. Core Annular Flow (CAF) models were found to greatly under predict the pressure gradients mainly due to the coating (oil fouling) effect associated with this study. A new coating coefficient was introduced to models presented by Bannwart (2001) and Rodriguez et al (2009). The addition of solid in the mixed flow led to minor increase in the pressure gradient when the particles were moving with the flow. However, higher sand concentration in the system led to higher pressure gradient values. The addition of gaseous phase to…

Subjects/Keywords: Heavy oil; high viscosity; flow assurance; water cut; flow patterns; pressure gradient; modelling; two phase; three phase; sand

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APA (6^th Edition):

Al-Awadi, H. (2011). Multiphase characteristics of high viscosity oil. (Thesis). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/13902

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):

Al-Awadi, Hameed. “Multiphase characteristics of high viscosity oil.” 2011. Thesis, Cranfield University. Accessed March 01, 2021. http://dspace.lib.cranfield.ac.uk/handle/1826/13902.

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

MLA Handbook (7^th Edition):

Al-Awadi, Hameed. “Multiphase characteristics of high viscosity oil.” 2011. Web. 01 Mar 2021.

Vancouver:

Al-Awadi H. Multiphase characteristics of high viscosity oil. [Internet] [Thesis]. Cranfield University; 2011. [cited 2021 Mar 01]. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/13902.

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

Council of Science Editors:

Al-Awadi H. Multiphase characteristics of high viscosity oil. [Thesis]. Cranfield University; 2011. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/13902

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

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