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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 61 for “"Two Phase Flows"”.
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Autoignition in turbulent two-phase flows
… review of the CMC method for both single and two-phase flows. The problem of modelling droplet related effects in the CMC transport equations is discussed in detail, and physically-sound models for the unclosed terms that appear in these equations and that are affected by the droplet presence …
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Two-phase flows accompanying fires in enclosures
The dispersed phase that accompanies enclosure fires, for example, soot, ash, sprinkler droplets and extinguishing powder, could exert a significant influence on the dynamics of the background fluid. In this thesis, the results of a numerical study into the effects of this dispersed phase on the …
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Experimental study of highly concentrated two-phase flows
… and successfully applied to granular shear flows in a Couette apparatus. This apparatus has been designed and constructed to obtain both global quantities and optical measurement of detailed particle movements. Over 48,000 pictures have been taken and analyzed. Concentration, velocity, and …
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Breakup and coalescence in turbulent two-phase flows
… processes involve a gas and a liquid or two immiscible liquids in turbulent flow. The turbulent flows present in two-phase systems will cause the bubbles or drops of a dispersion to undergo breakup and coalescence, and the resulting changes in the dispersion may significantly affect the …
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The interaction forces in fluid-solid two-phase flows
The interaction force between fluid and solid phases is studied for both steady and unsteady flow situations. As a model, solid particles are assumed to be spherical and are distributed in regular arrays. For steady flows, a numerical method is used to calculate the interaction force for Reynolds …
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Unstructured grid simulations of shocks and detonations in two-phase flows
… simulations have been made of compressible two-phase flows containing inert particles. An existing conservative, monotonic compressible flow solver with an unstructured, adaptive mesh was used as the basis for code development. This flow solver incorporated the Finite Element Method-Flux …
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Investigation of Particle Trajectories for Wall Bounded Turbulent Two-Phase Flows
The analysis of turbulent flows provides a unique scientific challenge whose solution remains central to unraveling the fundamental nature of all fluid dynamics. Measuring and predicting turbulent flows becomes even more difficult when considering a two-phase flow, which is a commonly encountered …
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Assessment strategies for mixing in very viscous gas-liquid two-phase flows
… gas combustion are bubbled through the three phase recirculating tank reactor. The turbulence generated by the rising bubble column causes rapid heating and mixing of the charge resulting in fast melting and homogeneous composition of the product. Detailed understanding of such two-phase gas …
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Particle Detachment in Single-Phase and Two-Phase Flows in Porous Media
… to account for the presence of a residual phase. Compared with fines migration under single-phase flow, having a residual phase significantly reduces the permeability variation. Analytical solutions for over and undersaturated state of fines were also derived in this thesis. Oversaturation …
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Investigation of Separated Flow Model in Annular Gas-Liquid Two-Phase Flows
Made available in DSpace on 2017-07-06T18:38:05Z (GMT). No. of bitstreams: 2 Dallman_John_C_PhD.pdf: 93542237 bytes, checksum: 4fa2fa5c801b1e30b5a3a310ff9a3fde (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1978
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A computational fluid dynamics study of two-phase flows in the presence of surfactants
… a front-tracking scheme is developed to study two-phase flows in the presence of surfactants at finite Reynolds numbers. Both fluids can be Newtonian or shear-thinning, and surfactants are soluble in the adsorption-desorption limit. A drop in the co-flowing geometry typically breaks up at the …
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Numerical simulation and modeling of two-phase flows using the volume-of-fluid method
Two-phase flows are of great interest in natural and industrial applications such as cavitation, spray atomization, and bubbly flows. As a two-phase system grows in complexity, analytical approximations of fluid behavior and experimental observations become more challenging. To make the detailed …
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CFD Analysis for Beyond Bubbly Gas-Liquid Two-Phase Flows in a Large Diameter Pipe
<p>"Due to the complexity of multiphase flow phenomena, numerical analysis for multiphase turbulent flow is not as reliable as single-phase computational fluid dynamics (CFD). A literature review has revealed that the current efforts on multiphase flow simulation have focused on small diameter …
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Phase-space representation of digital holographic and light field imaging with application to two-phase flows
In this thesis, two computational imaging techniques used for underwater research, in particular, two-phase flows measurements, are presented. The techniques under study, digital holographic imaging and light field imaging, are targeted at different flow conditions. In low-density flows, particles …
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Thermodynamically consistent modelling and computational methods for multiphase flows
… the research of my PhD, which is the study of two-phase flows by using the phase-field methods. The key point for this work is the thermodynamic con- sistency. We begin by introducing an extension of the Model H to study the two-phase flows with thermocapilliary effects, where we assume that …
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Boiling heat transfer in porous media with/without chimneys
… in the porous corrosion deposits deal with two-phase flows with phase changes in heterogeneous porous media. This analysis further requires a basic understanding of boiling heat transfer in homogeneous porous media. Therefore, two-phase flows with phase changes in porous media without …
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Pore-scale simulation frameworks for flow and transport in complex porous media
… geometry models, simulators for single-phase flow, multiphase flow, and transport, were developed. Stochastic geometry models were generated based on Voronoi tessellations for three basic types of porous media - granular, tubular and fibrous. The models can be used to create controlled …
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