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Showing 1 to 20 of 21 for “"Taylor-Couette"”.
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Helical magnetorotational instability in MHD Taylor-Couette flow
… and today such setup is usually referred as a Taylor-Couette flow. To prove experimentally the existence of MRI in a magnetized Taylor-Couette flow is a demanding task and different MHD groups around the world try to achieve it. The main problem lies in the fact that laboratory liquid metals …
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Characterization of a Taylor-Couette vortex flow reactor
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1994.
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Apparatus for spherical Taylor-Couette flow with induced thermal convection
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Instability and mixing in a turbulent stratified Taylor-Couette Flow
… mechanisms in a stably stratified turbulent Taylor-Couette flow, which is the flow in the annular region of two co-axial cylinders, both capable of rotating at different speeds independently, in the presence of vertical stable stratification. Oglethorpe (2014) found that, for an initially …
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Estudio experimental de inestabilidades de Taylor-Couette en suspensiones no coloidales a concentraciones medias
… para fluidos newtonianos en 1923 por Geoffrey I. Taylor, quien pudo determinar analíticamente la velocidad crítica de estabilidad para el flujo rotacional. Los supuestos realizados en este estudio no permiten extender sus resultados a fluidos no newtonianos, en partículas fluidos con partículas. …
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Experimental and Analytical Investigation of Particle Dynamics in Newtonian and non-Newtonian Fluids in a Taylor-Couette Cell
… operational conditions, this study utilizes a Taylor-Couette (TC) cell, which consists of a rotating inner cylinder and a stationary outer cylinder separated by a 9.0 mm annular gap. The TC cell allows for the investigation of the sedimentation behavior of spherical particles within both …
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UV Disinfection between Concentric Cylinders
… flow pattern can be either laminar or turbulent Taylor-Couette flow. UV disinfection between concentric cylinders in laminar Poiseuille flow, turbulent flow and both laminar and turbulent Taylor-Couette flow was investigated experimentally and numerically. This is the first systematic study done …
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Quantitative Measurement of Velocity and Dispersion via Magnetic Resonance Imaging
… 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 snapshot FLASH spin-tagging sequence can provide time-resolved visualization of 3-D swirling flows …
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Geometry mediated drag reduction using riblets and wrinkled surface textures
… aligned riblet structures on fully-developed Taylor-Couette flow. We perform both experimental studies as well as time-dependent numerical simulations in both the laminar Couette and the Taylor vortex regime. We again explore the effect of the size of the riblets with respect to the geometry …
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Passive and active approaches to sustained turbulent hydrodynamic drag reduction using superhydrophobic surfaces
… skin friction in turbulent flows using a bespoke Taylor-Couette apparatus. These superhydrophobic surfaces possess different surface topographies and chemistry, and exhibit different amount of drag reduction, leading to a deeper investigation of the role of surface chemistry and the roughness on …
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Lattice Boltzmann Methods for Diffuse and Mobile Interfaces
… instabilities occurring in the canonical Taylor-Couette-Poiseuille problem, and the numerical study serves to demonstrate the existence of a Stationary Helical Vortex mode. In the second flow, the LB simulations allow the study of the effect of interfacial mass transfer on the hydrodynamic …
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CFD Study of Taylor-Like Vortices in Swirling Flows
… chamber using CFD, a similarity with the Taylor vortices instability has been observed. Similar to the classic Taylor-Couette flow system, a secondary flow field in the form of wavy toroidal vortices spaced regularly along the axial direction appear under certain critical conditions. The …
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Theoretical and Experimental Study of a Continuous Hydrodynamically-Enhanced Separation System Paradigm
The Stationary Helical Vortex (SHV) mode in the Taylor-Couette-Poiseuille system is used as a base flow to investigate how parametric excitation can lead to chaotic segregation. The first part of this project focuses on how the three-dimensional velocity field in SHV is reconstructed for the first …
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The Diffuse Bounce Back Lattice Boltzmann Method and its Applications on the Study of Fluid-Particle Interactions
… the inertial migration of particle in the Taylor Couette flow.</p> <p>In this dissertation, the background and applications of fluid-structure interaction are first introduced. Descriptions of previously published models for fluid-structure interaction are expanded upon afterwards. Detailed …
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Particle size prediction in reactive precipitation processes
… the precipitation of aniline hydrochloride in a Taylor-Couette reactor has been simulated with a CFD code. This precipitation process has also been experimentally studied in a TC reactor, which had the same geometry as the simulated reactor and was operated under conditions identical to the …
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Multi-scale Coherent Structure Extraction and Visualization for Flow Analysis
… instantaneous (or time-independent) turbulent Taylor-Couette flow (TCF), and (3) a new framework to extract and visualize large-scale coherent structures in time-dependent shear flows using dynamic mode decomposition (DMD). The TAC-based framework enables us to select pathlines that can …
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Skin friction drag reduction in turbulent flows using superhydrophobic surfaces
… in fully turbulent flow inside a custom-built Taylor-Couette apparatus for Reynolds numbers in the range 1.64 x 104 </= Re </= 8.59 x 104, and a characteristic slip length was determined for each surface from frictional torque measurements. Drag reductions of up to 26%, and effective slip …
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Droplet levitation and underwater plastron restoration using aerophilic surface textures
… experiments under turbulent flow conditions in a Taylor-Couette cell which show that more than half of the drag increase ensuing from plastron collapse can be recovered spontaneously using this method. In the second part of this thesis, we demonstrate room-temperature Leidenfrost effect by using …
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Dynamic wetting of soft materials and applications of dynamic tensiometry
… surface to reduce skin friction in turbulent Taylor-Couette flow is investigated. A reduction in the wall shear stress measured at the rotating inner cylinder is demonstrated by depositing sprayable superhydrophobic microstructures on the inner rotor surface. The magnitude of skin friction …
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Exploring plastron stability and fluid friction reduction on robust micro-textured non-wetting surfaces
… in turbulent flows (at Re >/- 10⁴), a wide gap Taylor-Couette (TC) cell was constructed. A series of global torque measurements with a spray-coated superhydrophobic inner rotor is used to establish a friction reduction varying from 6% at Re ~ 2 x 10⁴ to a maximum of 22% at Re ~ 8 x 10⁴. By …
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