Global ETD Search
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 46 for “"Single-phase Flow"”.
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Modeling single-phase flow and solute transport across scales
Flow and transport phenomena in the subsurface often span a wide range of length (nanometers to kilometers) and time (nanoseconds to years) scales, and frequently arise in applications of CO₂ sequestration, pollutant transport, and near-well acid stimulation. Reliable field-scale predictions depend …
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Microfluidic reactors for the synthesis of nanocrystals
… nanocrystals (NCs). Initially, a simple single-phase capillary reactor was used for the synthesis of CdSe NCs. Precursors were delivered into a section of the capillary maintained at high temperature where they decomposed and reacted to form NCs. Monodisperse, bright CdSe NC samples were …
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Multiphase flow in porous media: the impact of capillarity and wettability from field-scale to pore-scale
Multiphase flow in the context of this Thesis refers to the simultaneous flow of immiscible fluids. It differs significantly from single-phase flow due to the existence of fluid-fluid interfaces, which are subject to capillary forces. Multiphase flow in porous media is important in many natural and …
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Experimental characterization of the Barree and Conway (2004) single-phase non-Darcy flow model in various hydraulic fracturing sands
… investigate the effect of non-Darcy flow through fracturing sand and irregular shaped materials on the parameters of the Barree and Conway (2004) non-Darcy single-phase flow model. It also investigates the existence of the minimum permeability concept. Several modifications were made …
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Development of the Distributed Points Method with Application to Cavitating Flow
… method for solving incompressible, multi-phase flow problems has been developed and is discussed along with the presentation of benchmark results showing good agreement with theoretical and experimental results. Results of a systematic, parametric study of the single phase flow around a 2D …
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Multiphase Flow Effects on Naphthenic Acid Corrosion of Carbon Steel
… acids (NAP) which, at high velocity multiphase flow conditions, can impair the integrity of transfer lines in crude distillation units. Previous studies have shown that NAP corrosion is particularly aggressive in the presence of a liquid phase at the metal surface. Although the effect of …
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Geometric and numerical optimisation of single- and two-phase convective heat transfer in microchannel heat sinks
… size for the present and future applications, single-phase and two-phase convective heat transfer mechanisms in circular, equilateral triangular, rectangular and square microchannels (micro passages for liquid flow in the heat sinks) were studied to enable electronic chip manufacturers to …
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Microbioreactors for bioprocess development
… E. coli cells are fed by pressure-driven single phase flow of fresh medium through a microchannel. Chemotaxis, the back growth of bacterial cells into the medium feed channel, is prevented by local heating.
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Numerical Investigation using RANS Equations of Two-dimensional Turbulent Jets and Bubbly Mixing layers
… numerical investigations of two-dimensional single-phase turbulent jets and bubbly mixing layers using Reynolds-Averaged Navier-Stokes (RANS) equations. The behavior of a turbulent jet confined in a channel depends on the Reynolds number and geometry of the channel which is given by the …
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Método de decomposição de domínios de múltiplos passos de tempo de Dirichlet-Neumann aplicado à injeção de polímeros em meios porosos
… For the mathematical model, in addition to the single-phase flow and transport equations, we postulate closure relationships for the adsorption isotherms, mechanical retention kinetics, and non-Newtonian pseudoplastic behavior. For the computational model, we propose a space-time domain …
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3D printing-based microfluidics for geosciences
… which enable the ability to perform repeatable single-phase flow species transport experiments. We use Particle Image Velocimetry (PIV) and Direct Numerical simulations (DNS) to show how, with our 3D printing setup, we can generate custom-designed micromodels accurately and repeatably with …
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Experimental and computational analysis of random cylinder packings with applications
… network, thus allowing for efficient microscale flow simulation. Single-phase flow simulations were conducted, and the results were validated by calculating permeabilities. In the experimental part of the research, a series of densification experiments were conducted on equilateral cylinders. …
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Quantitative modeling and characterization of hydrodynamics and transport in multiphase microreactors
On-chip flow chemistry synthesis has advanced rapidly in recent years as a fast and effective means to discover and screen suitable reaction candidates for continuous production. Among the many chemical reactions, multiphase reactions constitute a major category with important industrial …
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Experimental and Numerical Analysis of Enhanced Micro-Channel Cooling Using Micro-Synthetic Jets
… jets. The basic idea is to utilize the flow control aspects of synthetic jets to modify the flow field in micro-channels for better heat transfer performance.</p> <p>Hydrodynamic and thermal characteristics of both single-phase and two-phase flow with the new cooling scheme were studied …
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Investigation of fluids flow behavior in nano-scale channels by using optic imaging system
… in nanometer (nm) range. The physics of fluid flow in nanopores is poorly understood. Knowing the fluid flow behavior in the nano-range channels is of major importance for stimulation design, gas production optimization and calculations of the relative permeability of gas in tight shale gas …
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Coalescence of secondary dispersions in packed beds
… bed depth, ballotini size and dispersed phase concentration. Equipment was designed to generate a toluene ln water dispersion with phase ratios from 0.1 - 1.0 v/v % and whose mean drop size was determined using a Coulter Counter. The coalesced drops were sized by photography and the mean …
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Coalescence of secondary dispersions
… effects of presoaking the bed in the dispersed phase before operation were also considered. Equipment was design~d to generate a 0.1% phase ratio toluene in water dispersion whose mean drop size was determined using a Coulter Counter. The coalesced drops were sized by photography and a novel …
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Numerical simulation of multi-scale transport processes and reactions in pem fuel cells using two-phase models
… The modeling approach utilized the two-phase models involving water phase change for PEM fuel cells i.e. two-phase current (solid and membrane), two-phase flow (gas and liquid water) and two-phase temperature (fluid and solid). The catalyst layer has been modeled using the microscale …
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Coalescence of secondary dispersions in fibrous beds
… were identified as inlet drop size distribution, phase ratio, superficial velocity and the thickness and voidage of the bed . A recirculatory rig with interchangeable fibrous bed pads was designed and operated with toluene-water dispersions generated by a combination of centrifugal pumps . Inlet …
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On relative permeability : a new approach to two-phase fluid flow in porous media
Being valid for single-phase flow, Darcy's law is adapted to two-phase flow through the standard approach of relative permeability, in which permeability, rather than being a unique property of the porous medium, becomes a joint property of the porous medium and each fluid phase. The goal of this …
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