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 101 for “"pressure-driven"”.
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Pressure Driven Desalination Utilizing Nanomaterials
<p>Nanomaterials such as graphene oxide and carbon nanotubes, have demonstrated excellent properties for membrane desalination, including decrease of maintenance, increase of flux rate, simple solution casting, and impressive chemical inertness. Here, two projects are studied to investigate …
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Pressure-driven instability in planetary stagnant lids
… molten magma is most sensitive to temperature, pressure and solid fraction, which are in turn controlled by the phase diagram. However, in a well-mixed partial melt the solid fraction is itself a function of density and pressure. As the viscosity of a pure solid silicate is generally over 20 …
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Measurement and Modeling of Pressure -Driven Transient Burning of Solid Propellants
"In the modeling section of this study, two transient heterogeneous propellant combustion models, applicable to fine oxidizer composite propellants, are examined. The ""surface accumulation model"" supposes that components accumulate in a layer at the surface. Each component reaches an equilibrium …
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An Evaluation and Pressure-Driven Design of Potable Water Plumbing Systems
… systems. The formulation and application of a pressure-driven design approach to replace Hunter-based design methods is presented. EPANET, a commonly used hydraulic modeling software package, is utilized to evaluate network behavior. Example applications are presented to illustrate the …
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PRESSURE DRIVEN WALL JET FLOW NEAR CHANNEL EXIT AT MODERATE REYNOLDS NUMBER
The wall jet flow driven by a pressure gradient near channel exit at Reynolds Number ranging from the order of 10 to 100, emerging from a two-dimensional channel is examined theoretically in this study. Poiseuille flow conditions are assumed to prevail far upstream from the exit. The problem is …
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An experimental study of a three-dimensional pressure-driven turbulent boundary layer
A three dimensional, pressure driven turbulent boundary layer created by an idealized wing-body junction flow is experimentally studied. The body used is a 3 : 2 elliptical nosed NACA 0020 tailed symmetric profile which has a chord length of 30.5 cm (12 inches), maximum thickness of 7.17 cm (2.824 …
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Pressure-driven and electroosmotically-driven liquid chromatographic separations in packed fused silica capillaries
… miniaturized liquid chromatographic system under pressure-driven flow is studied and the improved permeability of micropacked capillary columns is exploited in the manufacture of several 25 to 30cm columns which achieve high efficiencies with relatively low pressure drops. Van Deemter plots …
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Analysis of a partial differential equation related to pressure-driven separations of binary liquids
Pressure-driven diffusion, in which a flux of species in a binary or multi-component fluid is driven by a pressure gradient, is known to be an important mechanism for effecting separations in a variety of chemical systems, including the separation of 238UF6 from 235UF6 in gas centrifuges, and in …
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Characterization of Pressure-Driven and Electro-Kinetically Driven Flow in a Micro-Fluidic Chip Using Particle Imaging Velocimetry
<p>The flow profiles of pressure-driven and electro-kinetic driven flows were compared for a microfluidic chip. It was found that the pressure-driven flow had a parabolic profile while the electro-kinetic flow had a plug shaped flow profile. The measured velocities were similar to those determined …
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Effect of self-stratification on channel flows and boundary layers: a study using direct numerical simulations
… has been used for modeling the flow; which is driven by a constant pressure gradient. In this thesis, we have explored the effect of stratification on a pressure driven channel flow. We came across two distinct regimes of the flow, one in which turbulence is damped but the flow is still fully …
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The mechanisms of moisture ingress & migration in rammed earth walls.
… that determined capillary suction and pressure-driven moisture ingress properties, and full-scale test walls were used in the SHU climatic simulation chamber. The experimental data was analysed and found to be in good agreement with existing theories on non-saturated flow …
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Shear Dispersion in Double-Porosity Systems
… with porous walls under the combined effects of pressure-driven and electro-osmotic flows, and v) a capillary tube with a porous wall under the combined effects of pressure-driven and electro-osmotic flows. For determination of the dispersion coefficients, first, a two-dimensional coupled solute …
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Quantitative Measurement of Velocity and Dispersion via Magnetic Resonance Imaging
Three pressure-driven flows of increasing complexity were examined, including flow through a water-saturated bed of randomly packed spheres, a Taylor-Couette-Poiseuille flow reactor, and the interstitial space between the blades of a rotating partitioned pipe mixer. Key findings show that a …
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Designing devices using electro-active yield stress fluids
… fields and particle volume fractions in wall-driven and pressure-driven flow. We report a yield hardening occurring in pressure-driven flow, as a result of a local increase in particle volume fraction. We propose a phenomenological physical model for the densification process, allowing us to …
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Direct simulations of cells motions and deformations in flow
… of blood cells, especially leukocytes, in pressure driven flows in parallel plate channels with both smooth and uneven walls under adhesion force between the leukocytes and the channel wall. Leukocytes are represented by two composite fluid models. The first model is the compound-drop model …
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Numerical Simulations of Flow and Mass Transport in Micro-Fluidic Components for Modular Bio-Analytic Chip Applications
… misalignments can have adverse effect in both pressure driven and electrokinetically driven flows. In the present work, Numerical Simulations have been performed to study the effect of material and geometrical mismatch on the flow behavior and species progression in microfluidic interconnects. …
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Microchip Liquid Chromatography and Capillary Electrophoresis Separations in Multilayer Microdevices
… methacrylate) (PMMA). I have demonstrated pressure-driven pumping of liquids in microfabricated channels using electrochemical actuation. PDMS-based micropumps were integrated easily with channel-containing PMMA substrates. Flow rates on the order of ~10 µL/min were achieved using low …
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A three-dimensional turbulent boundary layer upstream and around a junction vortex flow
A pressure-driven three-dimensional turbulent boundary layer flow upstream and around a junction vortex was experimentally studied and is offered for use as a benchmark flow for testing and evaluating the predictive ability of state-of-the-art three-dimensional turbulent boundary layer codes. The …
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Phase formation and structural transformation of strontium ferrite SrFeOx
… in oxygen conducting devices such as pressure driven oxygen generators, partial oxidation reactors in electrodes for solid oxide fuel cells (SOFC). ¶ This thesis examines the behaviour of the material at ambient and elevated temperatures using a broad spectrum of solid state …
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Phase formation and structural transformation of strontium ferrite SrFeOx
… in oxygen conducting devices such as pressure driven oxygen generators, partial oxidation reactors in electrodes for solid oxide fuel cells (SOFC). ¶ This thesis examines the behaviour of the material at ambient and elevated temperatures using a broad spectrum of solid state …
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