Results 161 to 170 of about 1,150 (206)

The use of dean vortices for crossflow microfiltration: basic principles and further investigation

Separation and Purification Technology, 2002
Abstract 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, M. Wille, G. Langer, U. Werner   +3 more
exaly   +2 more sources

Hollow-fibre membrane module design: comparison of different curved geometries with Dean vortices

Journal of Membrane Science, 2001
Abstract 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.
M J Clifton
exaly   +2 more sources

Diffusion combustion of microjets modulated by dean vortices

International Journal of Hydrogen Energy, 2023
V V Kozlov, A G Shmakov
exaly   +2 more sources

Membrane contactors for process intensification of gas absorption into physical solvents: Impact of dean vortices

Journal of Membrane Science, 2017
Membrane contactors are considered as one of the most promising intensification technologies for gas-liquid absorption processes. For chemical absorption systems, such as flue gas CO 2 absorption in amine solutions, the mass transfer resistance is significantly located in the membrane due to the accelerating effect exerted by the reaction in the liquid.
Cecile Lemaitre, Christophe Castel, Maude Ferrari   +2 more
exaly   +3 more sources

The use of Dean vortices in coiled hollow-fibre ultrafiltration membranes for water and wastewater treatment

Desalination, 1998
International audienceMass transfer in ultrafiltration for water and wastewater treatment is improved by Dean vortices. With this secondary flow, which appears in a coiled hollow-fibre module, the shear stress is higher than in a straight module and is a
Philippe Moulin, M J Clifton, J M Laine   +2 more
exaly   +2 more sources

Resonant Interactions of Dean Vortices in a Curved Channel Flow

Journal of the Physical Society of Japan, 1998
Summary: Stability of the flow in a curved channel is investigated with the Dean approximation by using the weakly nonlinear stability theory. A set of amplitude equations for the Dean vortices of wavenumber ratio \(1:2\) is derived. The amplitude equations describe the resonant interactions between the fundamental mode and the higher harmonic.
Mizushima, Jiro, Yanase, Shinichiro, Yoshizawa, Taku   +2 more
openaire   +1 more source

Numerical investigation of Dean vortices in a curved pipe

AIP Conference Proceedings, 2013
This study is devoted to the three-dimensional numerical simulation of developing secondary flows of Newtonian fluid through a curved circular duct. The numerical simulations produced for different Dean numbers show clearly the presence of two steady Dean vortices.
S. I. Bernad, A. Totorean, A. Bosioc, R. Stanciu, E. S. Bernad   +4 more
openaire   +1 more source

Critical conditions for development of a second pair of Dean vortices in curved microfluidic channels

Physical Review E, 2023
The centrifugal force in flow through a curved channel initiates a hydrodynamic instability that results in the development of Dean vortices, a pair of counter-rotating roll cells across the channel that deflect the high velocity fluid in the center toward the outer (concave) wall.
Minyoung Kim, Ali Borhan
openaire   +2 more sources

Dean vortices in turbulent flows: rocking or rolling?

Journal of Visualization, 2011
Flows in pipe bends have been studied extensively over the last decades due to their occurrence both in the human respiratory and blood systems as well as in many technical applications.
Athanasia Kalpakli, Ramis Örlü, P. Henrik Alfredsson   +2 more
openaire   +1 more source

The effect of spanwise system rotation on Dean vortices

Journal of Fluid Mechanics, 1994
An experimental study is reported of the flow in a high-aspect-ratio curved air channel with spanwise system rotation, utilizing hot-wire measurements and smoke visualization. The experiments were made at two different Dean numbers (De), approximately 2 and 4.5 times the critical De for which the flow becomes unstable and develops streamwise vortices ...
O. John E. Matsson, P. Henrik Alfredsson
openaire   +1 more source