Results 181 to 190 of about 8,927 (215)
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Journal of Membrane Science, 1999
Coiled and straight hollow-fibre modules have been built and tested; the permeate flux obtained in ultrafiltration with these two geometries is compared for two feeds: a colloidal bentonite suspension and a dextran solution. In the case of colloidal suspensions, the secondary flows induced by the coiled geometry allow fouling to be reduced and the ...
Moulin, Philippe +5 more
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Coiled and straight hollow-fibre modules have been built and tested; the permeate flux obtained in ultrafiltration with these two geometries is compared for two feeds: a colloidal bentonite suspension and a dextran solution. In the case of colloidal suspensions, the secondary flows induced by the coiled geometry allow fouling to be reduced and the ...
Moulin, Philippe +5 more
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Mass transfer improvement by secondary flows: Dean vortices in coiled tubular membranes
Journal of Membrane Science, 1996A helically wound hollow-fibre (or tubular) membrane module was studied in an oxygenation operation with water flowing in the laminar regime inside the tube. Data are compared with a conventional module where straight hollow-fibre membranes are in parallel alignment.
P. Moulin +4 more
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The use of dean vortices for crossflow microfiltration: basic principles and further investigation
Separation and Purification Technology, 2002Abstract The effect of Dean vortices on the filtration flux and efficiency of crossflow microfiltration processes in sinusoidal curved and helically coiled tubular membranes was investigated by several research groups. Experimental results are presented showing an enhanced filtrate flux and efficiency of the filtration process.
M. Bubolz +3 more
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The effect of slowly varying gap width on Dean vortices
Physics of Fluids A: Fluid Dynamics, 1993Taylor–Dean vortices are considered in channels whose thickness and curvature vary slowly on a scale 1/δ. The effect of divergence of the channel is shown to be destabilizing and of convergence to be stabilizing. Results for neutral curves are presented for a class of particular channels, and a method of computing such curves for more general channels ...
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Hollow-fibre membrane module design: comparison of different curved geometries with Dean vortices
Journal of Membrane Science, 2001Abstract The performance of several designs of curved membrane modules with Dean vortices was compared through experiments using a colloidal bentonite suspension and cellulose acetate hollow-fibre ultrafiltration (UF) membranes. The different module geometries were: straight, helically coiled, twisted and sinusoidal, or meander-shaped.
J.N Ghogomu +4 more
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Dean vortices: a comparison of woven versus helical and straight hollow fiber membrane modules
Journal of Membrane Science, 2000Abstract A new ultrafiltration module containing woven hollow fibers was tested. The purpose of this paper is (i) to present ultrafiltration performance of the new module with dextran solutions and (ii) to compare the performance with those obtained in helical and straight modules containing identical hollow fibers. The effect of velocity on limiting
Kuakuvi, D.N. +2 more
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Physics of Fluids, 2003
Two-fluid Dean vortex flow in a coiled pipe with vanishing torsion, and its effect on the mass transfer through the liquid–liquid interface of two immiscible fluids are studied numerically. The liquids are stratified by gravity, with the denser one occupying the lower part of the pipe.
Gelfgat, A. Yu. +2 more
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Two-fluid Dean vortex flow in a coiled pipe with vanishing torsion, and its effect on the mass transfer through the liquid–liquid interface of two immiscible fluids are studied numerically. The liquids are stratified by gravity, with the denser one occupying the lower part of the pipe.
Gelfgat, A. Yu. +2 more
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Physics of Fluids, 2005
Large-eddy simulations are performed to investigate turbulent flows through 90° pipe bends that feature unsteady flow separation, unstable shear layers, and an oscillation of the Dean vortices. Single bends with curvature radii of one- and three-pipe diameters are considered at the Reynolds number range 5000–27 000.
Rütten, F. +2 more
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Large-eddy simulations are performed to investigate turbulent flows through 90° pipe bends that feature unsteady flow separation, unstable shear layers, and an oscillation of the Dean vortices. Single bends with curvature radii of one- and three-pipe diameters are considered at the Reynolds number range 5000–27 000.
Rütten, F. +2 more
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Diffusion combustion of microjets modulated by dean vortices
International Journal of Hydrogen Energy, 2023V.V. Kozlov +4 more
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Dean vortices with wall flux in a curved channel membrane system: 2. The velocity field
AIChE Journal, 1996AbstractThe velocity and pressure fields and the effect of wall flux on these fields in a spiral channel are presented. As fluid flows inward through a spiral channel with constant gap and permeable walls, the streamwise flux decreases while the curvature increases. Thus, by balancing the stabilizing effect of wall suction with the destabilizing effect
Kun Yong Chung +2 more
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