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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 52 for “"Poiseuille flow"”.
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Flow field modifications and wave development in a plane Poiseuille flow
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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On the energetics of primary and secondary instabilities in plane Poiseuille flow
The phenomenon of transition in a laminar flow has been a topic of continued interest for many years. Recent experiments in shear flows have revealed a series of instabilities that lead to breakdown to turbulence. We have completed an analysis of the mechanisms which drive the primary (TS wave) and …
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Coupling complex microchannel heat exchanger CFD with plug flow and Poiseuille flow models
… be simplified by solving the individual channel flow separately. By substituting plug flow and Poiseuille flow models for the individual channels, computational efficiency can be improved. This work presents the coupling of plug flow and Poiseuille flow models with ANSYS's computational fluid …
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Uniformly valid asymptotic solutions of the Orr-Sommerfeld equation and their application to plane Poiseuille flow
Thesis: M.S., Massachusetts Institute of Technology, Department of Mathematics, 1961
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Cell-cycle dependent motility of Chlamydomonas reinhardtii and its collective motion in response to a Hagen-Poiseuille flow
… the collective motion of algal cells in a Hagen–Poiseuille flow, a relevant component flow for air-lift photobioreactors. The cell number density profiles were calculated by an individual-based simulation and a continuum system inclusive of the buoyancy effect imposed by the aggregated cells on …
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UV Disinfection between Concentric Cylinders
… When the two concentric cylinders are fixed, the flow pattern in the gap can be laminar Poiseuille flow or turbulent flow depending on flow rates. If the inner cylinder is rotating, and the rotating speed of the inner cylinder exceeds a certain value, the flow pattern can be either laminar or …
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Flow Between a Cylinder and a Rotating Coaxial Cylinder, Axisymmetric Shaft With Axially-Periodic Radius Variation, or Screw
"Flow between a circular cylinder and an inner shaft driven by an axial pressure gradient or boundary rotation is considered computationally. In spiral Poiseuille flow (SPF), where the inner shaft is a circular cylinder, complete linear stability boundaries are determined for a wide range of …
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Electromechanics and electrorheology of fluid flow with internal micro-particle electrorotation
… responses of two dimensional Couette and Poiseuille flows with internal micro-particle electrorotation are modeled and analyzed via a set of "fully continuum mechanical modeling field equations" formulated in this thesis. By combining the theories of particle electromechanics and continuum …
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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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Modeling of laminar-to-turbulent transition using a hybrid multi-scale simulation strategy
… the onset of transition and the associated flow dynamics. Direct numerical simulation (DNS), although suitable for fundamental studies, tends to be computationally expensive, thus making large-eddy simulations (LES) a viable strategy. In LES, large scales of the flow field are computed, and …
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Behavior of Polymer Solutions and Melts in Shearing and Elongational Flow Using Streak Photography and Birefringence
… (polyacrylamide solution) fluid undergoing flow past a radially oriented cylinder in both a converging and uniform flow field. The glycerin and polyacrylamide solutions are found to follow Newtonian and power law behavior, respectively, in Poiseuille flow between parallel plates and the …
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Enhanced Laminar Convective Heat Transfer using Microstructured Superhydrophobic Surfaces
… and pressure loss for both laminar and turbulent flow. The hydrodynamic effects of these surfaces have been studied in depth, but the effects on heat transfer are largely unknown. The primary goal of this research effort was to explore the effects of slip flow on laminar convective heat transfer …
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Caratterizzazione di membrane inorganiche per la separazione di idrogeno da gas di reforming
… mechanisms, such as Knudsen diffusion and Hagen-Poiseuille flow, have been observed for porous membranes and for palladium silver alloy ones with pinholes in the metal layer. Mixtures permeation experiments reveal also concentration polarisation phenomena and hydrogen permeability reduction due …
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Flow Induced Crystallization of Polyethylene Fibers From Solution
… growth sequence of a polyethylene fiber in the Poiseuille flow geometry. Features of an earlier study using the surface growth method to produce polyethylene fibers in Couette geometry are also included in the discussion. Fiber growth is initiated from a polyethylene seed inserted into a …
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Numerical Simulation of Viscous Flow: A Study of Molecular Dynamics and Computational Fluid Dynamics
… MD and CFD as a viable means of studying viscous flow on a nanometer scale. Specifically, we investigate a pressure-driven Poiseuille flow. The results of the MD simulations are processed using software we created to measure velocity, density, and pressure. The CFD simulations are run on numerical …
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Quantifying particle sorting in microbubble streaming flows
… of microparticles in a bubble streaming flow. We show that in microchannels, the steady streaming flow generated by an ultrasonically driven semicylindrical microbubble can be combined with a Poiseuille flow to achieve tunable, high throughput, size-sensitive sorting and trapping of …
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A coarse grained transport model for nanofluidic systems
… Dynamics (MD) is an important tool to simulate flows at the nanoscale. The limitation of MD in simulating important biological and chemical systems having a large length and time scale, increased the interest in efficient coarse-grained (CG) models. Although many existing CG models for various …
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Algorithms for particle remeshing applied to smoothed particle hydrodynamics
… the simulation of nearly incompressible fluid flows. As with the remeshing schemes used in mesh and grid-based methods, there is a need to use localized refinement in particle methods to reduce computational costs. Various forms of particle refinement have been proposed for particle-based …
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