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Dissertations / Theses on the topic 'Buoyancy flow'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Crosby, Andrew. "Buoyancy-driven viscous flows." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648304.

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2

Karimfazli, Ida. "Buoyancy-driven flow of viscoplastic fluids." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54981.

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We study natural convection of viscoplastic fluids in 2D domains. A sufficiently large yield stress introduces a static solution to the Navier–Stokes equations that may not otherwise exist. We find conditions that guarantee such motionless regimes and investigate flow development between static and advective states. Considering three problems, we explore the various ways in which the yield stress modifies the hydrodynamics of steady and transient natural convection. We start by analyzing natural convection in an infinitely long rectangular cavity. Flow is driven by a constant horizontal temper

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3

Lillibridge, Kris Hamilton. "Buoyancy-driven two-phase countercurrent flow." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/16027.

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4

Wongl, Li Shing. "Flow and heat transfer in buoyancy induced rotating flow." Thesis, University of Sussex, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250118.

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5

Christensen, Einar Rossebø. "Numerical solution of buoyancy-driven flow problems." Thesis, Norwegian University of Science and Technology, Department of Mathematical Sciences, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9904.

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<p>Numerical solution of buoyancy-driven flow problems in two spatial dimensions is presented. A high-order spectral method is applied for the spatial discretization, while the temporal discretization is done by operator splitting methods. By solving the convection-diffusion equation, which governs the temperature distribution, a thorough description of both the spatial and the temporal discretization methods is given. A fast direct solver for the arising system of algebraic equations is presented, and the expected convergence rates of both the spatial and the temporal discretizations are veri

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6

Bond, Derek P. "Near field development of buoyancy driven flows." Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-.

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7

Tang, Hui. "Theoretical models of buoyancy-induced flow in rotating cavities." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.715282.

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Calculation of the blade tip clearances of the high-pressure-compressor rotors in aeroengines involves calculating the radial growth of the corotating compressor discs. This requires the calculation of the thermal growth of the discs, which in turn requires a knowledge of the disc temperatures and Nusselt numbers for the buoyancy-induced flow in the cavity between the discs. This is a strongly conjugate problem in which the equations for the fluid flow and the disc temperature are coupled. In this thesis, the buoyancy-induced flow and heat transfer inside the compressor rotors is modelled assu

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8

Chang, Chun-Chuan. "Computational modelling of buoyancy-driven displacement ventilation flows." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/computational-modelling-of-buoyancydriven-displacement-ventilation-flows(b733bf3b-6900-47f5-86a1-d0a7b2198f3c).html.

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The study of the buoyancy–driven displacement ventilation flows has been conducted earlier through both mathematical modelling and experiments. There can be some assumptions made in the studies for thermal analysis such as: adiabatic boundaries, neglecting radiation heat transfer between wall surfaces, and neglecting the absorptivity of the air on simulating the thermal distribution within the ventilated spaces. This study considers heat conduction at boundaries, heat radiation between wall surfaces and radiative absorptivity of the air when modelling buoyancy-driven displacement ventilation f

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9

Zaidi, Imama. "Reliability of CFD for buoyancy driven flows in industrial applications." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/reliability-of-cfd-for-buoyancy-driven-flows-in-industrial-applications(f053b55d-7514-479a-a905-58a2a048aaee).html.

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With the current development of the computer industry, CFD simulations have become the widespread standard in the industry, forming a baseline tool for numerous designs and safety procedures. This extensive dependence on the CFD codes rather than experiments raises the issue of the reliability of the results obtained from these codes. This thesis is intended to study the dependence of the CFD results on the grid types, numerical schemes and turbulence models. Additionally, comparisons between a general purpose commercial code STAR-CCM+ and a specialized code FDS are presented towards the end o

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10

Chatterjee, Aniruddha. "Physical and computational models of Marangoni and buoyancy flow during dissolution." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43172.

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During the production of titanium products, the presence of aluminum-rich regions can cause Type II alpha stabilized defects which are deleterious to down-stream performance. Al-rich material can enter the melt via ballistic transfer from the melting hearth at various stages during electron beam cold hearth re-melting (EBCHR) of Ti-6Al-4V (Ti-6wt%Al-4wt%V) alloy. If this material is not fully dissolved and homogenized when solidification occurs, the ingot will contain Al-rich regions. Thus, in order to produce high-performance components for aerospace applications, titanium producers must unde

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11

Lewis, Tanat. "Numerical simulation of buoyancy-induced flow in a sealed rotating cavity." Thesis, University of Bath, 1999. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285311.

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12

Rayward-Smith, William John. "On buoyancy-driven flow in porous media motivated by the energy industry." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610492.

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13

Ritenour, Eric Micheal. "An experimental investigation of buoyancy-driven countercurrent two-phase flow in inclined channels." Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/19117.

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14

Qin, Tongran. "Buoyancy-thermocapillary convection of volatile fluids in confined and sealed geometries." Diss., Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/54939.

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Convection in a layer of fluid with a free surface due to a combination of thermocapillary stresses and buoyancy is a classic problem of fluid mechanics. It has attracted increasing attentions recently due to its relevance for two-phase cooling. Many of the modern thermal management technologies exploit the large latent heats associated with phase change at the interface of volatile liquids, allowing compact devices to handle very high heat fluxes. To enhance phase change, such cooling devices usually employ a sealed cavity from which almost all noncondensable gases, such as air, have been eva

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15

Li, Yaofa. "Experimental studies of Marangoni convection with buoyancy in simple and binary fluids." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53893.

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The flow in a layer of volatile fluid driven by a horizontal temperature gradient is a fundamental transport model for numerous evaporative passive cooling applications. When a thin film of a volatile liquid is subject to a horizontal temperature gradient, changes in the surface tension at the free surface lead to Marangoni stresses that drive the flow. In a thicker liquid layer, the flow is also affected by buoyancy. This thesis describes experimental studies of convection driven by a combined action of Marangoni stresses and buoyancy in simple and binary volatile liquid layers confined in a

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16

Dudfield, Peter. "Buoyancy driven flow in porous media applied to heat storage and carbon sequestration." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709382.

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17

Peoples, W. Wesley (William Wesley) 1977. "The effects of staggered buoyancy modules on flow-induced vibration of marine risers." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/89915.

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18

Cresswell, R. W. "An experimental study of a turbulent jet in which buoyancy acts against initial momentum." Thesis, Open University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233227.

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19

Riley, Robert Jeffrey. "An investigation of the stability and control of a combined thermocapillary-buoyancy driven flow." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/18918.

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20

MANU-MARFO, DANIEL. "Crust-Uppermost Mantle Shear-wave Velocity Structure and Buoyancy Flow Model beneath the Tyrrhenian Basin and Surrounding Margins." Doctoral thesis, Università degli Studi di Trieste, 2020. http://hdl.handle.net/11368/2961200.

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The Tyrrhenian basin serves as a natural laboratory for back-arc basin studies in the Mediterranean region. Yet, little is known about the crust-uppermost mantle structure beneath the basin and surrounding margins. Here, we present a new 3D shear-wave velocity model and Moho topography map for the Tyrrhenian basin and its margins using ambient noise cross-correlations. We apply a self-parameterized Bayesian inversion of Rayleigh-wave group and phase velocity dispersions to estimate the lateral variation of shear velocity and its uncertainty as a function of depth down to 100 km. We also derive

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21

Flynn, Morris R. "Buoyancy and stratification in Boussinesq flow with applications to natural ventilation and intrusive gravity currents." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3237381.

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Thesis (Ph. D.)--University of California, San Diego, 2006.<br>Title from first page of PDF file (viewed December 8, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 158-164).

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22

Rouai, N. M. "Influences of buoyancy and imposed flow transients on turbulent convective heat transfer in a tube." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378821.

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23

Iyer, Suresh Viswanathan. "Study of buoyancy induced flow and heat transfer in a cylindrical annulus with geometric perturbations /." The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487953204281755.

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24

Christiansen, Lizet Brøkner. "Submarine hydrogeology in volcanic seamount environments an analysis of compaction-and buoyancy-driven fluid flow /." Available to US Hopkins community, 2003. http://wwwlib.umi.com/dissertations/dlnow/3080643.

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25

Zohrabian, Alfred Sorooshkani. "An experimental and theoretical study of buoyancy driven air-flow in a half-scale stairwell model." Thesis, Brunel University, 1989. http://bura.brunel.ac.uk/handle/2438/5349.

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The buoyancy-driven air flow and the associated energy transfer within a half-scale stairwell model have been investigated experimentally and theoretically. The experimental work comprised the larger part of the investigation. The stairwell model consisted of a lower and an upper compartment connected through the stairway. The recirculation of air was maintained by a continuous supply of heat in the lower compartment. Two different cases, referred to as closed and open non-sloping ceiling stairwells, were considered. In the former, the stairwell formed a closed system, and in the latter situat

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26

Varma, Khyati B. "Numerical investigation of effect of buoyancy on the wake of a heated cylinder in contra flow." [Ames, Iowa : Iowa State University], 2007.

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27

Iyi, Draco. "A study on buoyancy driven turbulent flow associated with radiation in cavities partially filled with blockages." Thesis, Northumbria University, 2013. http://nrl.northumbria.ac.uk/15246/.

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Fluid flow and heat transfer in cavities partially filled with disconnected blockages is important in the design of a wide range of industrial and engineering applications such as thermal management of indoor environments, cooling of electronic panels, drying of agricultural products, stacking of items in cold storage etc. The flows in such confined spaces develop as a result of temperature and concentration gradient which is further complicated by the interactive effects of turbulence and radiation. The aims of this research are to explore the detailed heat transfer and flow field inside cavi

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28

Ren, Qinlong. "Numerical Simulation of 2D Electrothermal Flow Using Boundary Element Method." Thesis, The University of Arizona, 2013. http://hdl.handle.net/10150/312496.

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Microfluidics and its applications to Lab-on-a-Chip have attracted a lot of attention. Because of the small length scale, the flow is characterized by a low Re number. The governing equations become linear. Boundary element method (BEM) is a very good option for simulating the fluid flow with high accuracy. In this thesis, we present a 2D numerical simulation of the electrothermal flow using BEM. In electrothermal flow the volumetric force is caused by electric field and temperature gradient. The physics is mathematically modeled by (i) Laplace equation for the electrical potential, (ii) Poiss

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29

Lu, Yi, Qinlong Ren, Tingting Liu, et al. "Long-range electrothermal fluid motion in microfluidic systems." PERGAMON-ELSEVIER SCIENCE LTD, 2016. http://hdl.handle.net/10150/621709.

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AC electrothermal flow (ACEF) is the fluid motion created as a result of Joule heating induced temperature gradients. ACEF is capable of performing major microfluidic operations, such as pumping, mixing, concentration, separation and assay enhancement, and is effective in biological samples with a wide range of electrical conductivity. Here, we report long-range fluid motion induced by ACEF, which creates centimeter-scale vortices. The long-range fluid motion displays a strong voltage dependence and is suppressed in microchannels with a characteristic length below similar to 300 mu m. An exten

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30

Petersson, Jens. "CFD-analysis of buoyancy-driven flow inside a cooling pipe system attached to a reactor pressure vessel." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-112796.

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In this work a cooling system connected to a reactor pressure vessel has been studied using the CFD method for the purpose of investigating the strengths and shortcomings of using CFD as a tool in similar fluid flow problems within nuclear power plants. The cooling system is used to transport water of 288K (15°C) into a nuclear reactor vessel filled with water of about 555K (282°C) during certain operating scenarios. After the system has been used, the warm water inside the vessel will be carried into the cooling system by buoyancy forces. It was of interest to investigate how quickly the warm

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31

Lall, Balwant Singh 1969. "Numerical simulation of buoyancy induced flow and heat transfer in a vertical channel with discrete heat sources." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/278169.

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Effective cooling of electronic components arranged in vertically oriented parallel boards is considered. The objective of the present investigation is to examine the effects of global flow in a channel upon the local heat transfer from a flush mounted source. The concept of adiabatic heat transfer coefficient and its application is clarified by reviewing its origins and examining a series of numerical experiments on a well-defined model problem. Simulations are conducted in the regions of laminar forced flow, mixed forced and local buoyant convection and buoyancy-induced flow. Local buoyancy

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32

Park, David. "The Application of the Solar Chimney for Ventilating Buildings." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/73418.

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This study sought to demonstrate the potential applications of the solar chimney for the naturally ventilating a building. Computational fluid dynamics (CFD) was used to model various room configurations to assess ventilation strategies. A parametric study of the solar chimney system was executed, and three-dimensional simulations were compared and validated with experiments. A new definition for the hydraulic diameter that incorporated the chimney geometry was developed to predict the flow regime in the solar chimney system. To mitigate the cost and effort to use experiments to analyze buildi

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33

Heisler, Elizabeth Marie. "Exploring Alternative Designs for Solar Chimneys using Computational Fluid Dynamics." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/52572.

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Solar chimney power plants use the buoyancy-nature of heated air to harness the Sun's energy without using solar panels. The flow is driven by a pressure difference in the chimney system, so traditional chimneys are extremely tall to increase the pressure differential and the air's velocity. Computational fluid dynamics (CFD) was used to model the airflow through a solar chimney. Different boundary conditions were tested to find the best model that simulated the night-time operation of a solar chimney assumed to be in sub-Saharan Africa. At night, the air is heated by the energy that was store

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34

Viswanathan, Aroon Kumar. "Detached Eddy Simulation of Turbulent Flow and Heat Transfer in Turbine Blade Internal Cooling Ducts." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/28518.

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Detached Eddy Simulations (DES) is a hybrid URANS-LES technique that was proposed to obtain computationally feasible solutions of high Reynolds number flows undergoing massive separation with reliable accuracy. Since its inception, DES has been applied to a wide variety of flow fields, but mostly limited to unbounded external aerodynamic flows. This is the first study to apply and validate DES to predict the internal flow and heat transfer in non-canonical flows of industrial relevance. The prediction capabilities of DES in capturing the effects of Coriolis forces, which are induced by rotatio

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35

Gottapu, Manohar. "Two-phase flow: buoyancy driven flow of a partially miscible droplet at low Reynolds number a thesis presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2009. http://proquest.umi.com/pqdweb?index=0&did=2000384971&SrchMode=1&sid=3&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1279288319&clientId=28564.

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36

Sleiti, Ahmad Khalaf. "EFFECT OF CORIOLIS AND CENTRIFUGAL FORCES ON TURBULENCE AND TRANSPORT AT HIGH ROTATION AND BUOYANCY NUMBERS." Doctoral diss., University of Central Florida, 2004. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4408.

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This study attempts to understand one of the most fundamental and challenging problems in fluid flow and heat transfer for rotating machines. The study focuses on gas turbines and electric generators for high temperature and high energy density applications, respectively, both which employ rotating cooling channels so that materials do not fail under high temperature and high stress environment. Prediction of fluid flow and heat transfer inside internal cooling channels that rotate at high rotation number and high density ratio similar to those that are existing in turbine blades and generator

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37

Reid, W. J. "Experimental investigation of circumferentially non-uniform heat flux on the heat transfer coefficient in a smooth horizontal tube with buoyancy driven secondary flow." Diss., University of Pretoria, 2005. http://hdl.handle.net/2263/66236.

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Most heat transfer tubes are designed for either fully uniform wall temperature or fully uniform wall heat flux boundary conditions under forced convection. Several applications, including but not limited to the solar collectors of renewable energy systems, do however operate with non-uniform boundary conditions. Limited research has been conducted on non-uniform wall heat flux heat transfer coefficients in circular tubes, especially for mixed convection conditions. Such works are normally numerical in nature and little experimental work is available. In this experimental investigation th

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38

Sewall, Evan Andrew. "Large Eddy Simulations of Flow and Heat Transfer in the Developing and 180° Bend Regions of Ribbed Gas Turbine Blade Internal Cooling Ducts with Rotation - Effect of Coriolis and Centrifugal Buoyancy Forces." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29858.

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Increasing the turbine inlet temperature of gas turbine engines significantly increases their power output and efficiency, but it also increases the likelihood of thermal failure. Internal passages with tiny ribs are typically cast into turbine blades to cool them, and the ability to accurately predict the flow and heat transfer within these channels leads to higher design reliability and prevention of blade failure resulting from local thermal loading. Prediction of the flow through these channels is challenging, however, because the flow is highly turbulent and anisotropic, and the presenc

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39

Stockinger, Christopher Allen. "Numerical Analysis of Airflow and Output of Solar Chimney Power Plants." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/71670.

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Computational fluid dynamics was used to simulate solar chimney power plants and investigate modeling techniques and expected energy output from the system. The solar chimney consists of three primary parts: a collector made of a transparent material such as glass, a tower made of concrete located at the center of the collector, and a turbine that is typically placed at the bottom of the tower. The collector absorbs solar radiation and heats the air below, whereby air flows inward towards the tower. As air exits at the top of the tower, more air is drawn below the collector repeating the pr

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40

O'Sullivan, Paul D. "Experimental study of single sided ventilation through a multi-configuration slotted louvre system." Thesis, Brunel University, 2018. http://bura.brunel.ac.uk/handle/2438/16416.

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Evidence based performance of novel ventilation systems in existing low energy buildings is invaluable as it provides data on the system operation in a real dynamic environment. This thesis presents the outcomes from research involving a number of experimental field studies of a single sided ventilation system installed in a single cell office space as part of a building retrofit pilot project in Cork, Ireland. The solution consists of a purpose provided, multi configuration opening, comprising a narrow slotted architectural louvre component split across a low level manual opening section and

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41

Varotto, Simone. "Numerical study of thermal effect on pollutant dispersion within a street canyon." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Il fine ultimo dell' elaborato consiste nello studio della correlazione vigente fra forze di galleggiamento e fenomeni di trasporto di inquinante. Si vuole osservare l'impatto degli effetti termici all'interno di uno street canyon sulla dispersione di CO. Sono stati impiegati dei software CFD al fine di condurre delle simulazioni numeriche che garantiscano, in brevi tempi di esecuzione, risultati affidabili e facilmente graficabili. La tesi è redatta in lingua inglese e articolata in sei capitoli. Il primo tratta una valutazione complessiva dei problemi legati all'inquinamento dell'aria, i

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42

Mayo, Yague Ignacio. "Flow field and heat transfer in a rotating rib-roughened cooling passage." Phd thesis, Toulouse, INPT, 2017. http://oatao.univ-toulouse.fr/19529/1/MayoYague_Ignacio.pdf.

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A great effort has been carried out over the recent years in the understanding of the flow field and heat transfer in the internal cooling channels present in turbine blades. Indeed, advanced cooling schemes have not only lead to the increase of the gas turbine efficiency by increasing the Turbine Inlet Temperature above the material melting temperature, but also the increase of the turbine lifespan. To allow such progresses, modern experimental and numerical techniques have been widely applied in order to interpret and optimize the aerodynamics and heat transfer in internal cooling channels.

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43

Davies, Gavin Miles James. "Buoyancy driven flows through openings." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319459.

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44

Ngachin, Merlin. "Simulation of Rising Bubbles Dynamics Using the Lattice Boltzmann Method." FIU Digital Commons, 2011. http://digitalcommons.fiu.edu/etd/466.

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The main purpose of this thesis was to propose and test a new approach that captures the features of single and multiple bubbles dynamics using the Shan and Chen-type lattice Boltzmann method (LBM). Two dimensional bubbles motions were simulated considering the buoyancy effect for which the topology of the bubble is characterized by the Eötvös (Eo), and Morton (M) numbers. A qualitative and quantitative validation were performed using the Level set method. Bubble shape deformation was captured and analysis based on terminal Reynolds number and degree of circularity show very good agreement wit

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45

Caulfield, C. P. "Stratification and buoyancy in geophysical flows." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386925.

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46

Bolster, Diogo Tomás. "Transport and transients in buoyancy driven flows." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3258710.

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Thesis (Ph. D.)--University of California, San Diego, 2007.<br>Title from first page of PDF file (viewed June 8, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 195-199).

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47

Omara, Abdeslam. "Étude de la convection mixte transitoire conjuguée dans une conduite verticale épaisse." Besançon, 2008. http://www.theses.fr/2008BESA2050.

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On présente les résultats d’une simulation numérique de la convection mixte conjuguée transitoire dans un tube vertical soumis à un flux DED chaleur constant et uniforme. Le fluide pénètre au haut du tube pour se diriger vers le bas ; par conséquent on est en présence d’un écoulement de convection mixte contrariée. Les équations de conservation dans le fluide et dans la paroi sont résolues numériquement en utilisant la méthode des volumes finis. Le couplage pression-vitesse est assuré en utilisant l’algorithme simple. On étudie l’influence des propriétés physiques et géométriques sur l’évoluti

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48

Knopp, Tobias. "Finite element simulation of buoyancy-driven turbulent flows." Doctoral thesis, [S.l.] : [s.n.], 2003. http://webdoc.sub.gwdg.de/diss/2003/knopp/knopp.pdf.

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49

Sheng, Y. "Modifications to the SIMPLE method for buoyancy-driven flows." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0024/NQ51011.pdf.

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50

Sheng, Yi Qian. "Modifications to the SIMPLE method for buoyancy-driven flows /." *McMaster only, 1999.

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