Results 171 to 180 of about 1,150 (206)

EFFECT OF SPANWISE SYSTEM ROTATION ON SPATIALLY DEVELOPING DEAN VORTICES

International Journal for Numerical Methods in Fluids, 1996
Summary: Three-dimensional spatially developing Navier-Stokes calculations are carried out to simulate the flow in a curved, rotating channel. The competition between centrifugal and Coriolis forces, expressed by the ratio of the Dean number to the rotation number, gives rise to a variety of possible instability modes characterized by the presence of ...
RANDRIARIFARA T, BOTTARO, ALESSANDRO
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Enhancement of Film Cooling Effectiveness Using Dean Vortices

Journal of Turbomachinery, 2019
Abstract Film cooling technology is widely used in gas turbines. With the additive manufacturing anticipated in the future, there will be more freedom in film cooling hole design. Exploiting this freedom, the present authors tried using curved holes to generate Dean vortices within the delivery line.
Pingting Chen, Lang Wang, Xueying Li, Jing Ren, Hongde Jiang, Terrence Simon   +5 more
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Numerical simulation of viscoelastic Dean vortices in a curved duct

Journal of Non-Newtonian Fluid Mechanics, 2009
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Helin, L., Thais, L., Mompean, G.
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Experimental Investigation of a Free Round Jet with Dean Vortices

Siberian Journal of Physics, 2014
Results of the experimental investigations of free round jet with Dean vortices formed in curved channel are presented. Hot-wire anemometry measurements of three-dimensional mean velocity profile were performed, smoke visualization pictures cross and longitudinal sections at nozzle exit and downstream were obtained.
Maria Litvinenko, Yuriy Litvinenko, Grigory Kozlov, Valentin Vikhorev   +3 more
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Unraveling effects of Dean vortices on membrane fouling in a sinusoidally curved channel

Journal of Membrane Science, 2020
Abstract Particulate fouling is detrimental to membrane-based processes for water/wastewater treatment, water reclamation, desalination, and other applications. Although it has been recognized that curved channels can induce Dean vortices (i.e., the secondary flows arising from the centrifugal instability), the effects of the Dean vortices on the ...
Xin Liu, Dongyu Du, Guoquan Tu, Weiyi Li
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Process intensification by exploiting Dean vortices in catalytic membrane microreactors

Chemical Engineering Science, 2017
Abstract In this work, a mathematical model is developed for a heterogeneously catalyzed reaction in a porous membrane micro-reactor. Hydrogenation of an aqueous nitrite contaminant in water is analyzed as a model reaction. For a straight micro-reactor a numerical algorithm is developed to predict the behavior for non-linear kinetics.
A. Choudhary, S. Pushpavanam
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Wavenumber selection and irregularity of spatially developing nonlinear Dean and Görtler vortices

Journal of Fluid Mechanics, 1994
Spatially developing vortices found in curved channels (Dean vortices) and in a concave boundary layer (Görtler vortices) asre studied numerically using Legendre spectral-element methods. The linear instability of these vortices with respect to spanwise perturbations (Eckhaus instability) is examined using parabolized spatial stability analysis.
Guo, Y., Finlay, W. H.
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Mass transfer enhancement of hollow fiber membrane deoxygenation by Dean vortices

Journal of Zhejiang University-SCIENCE A, 2019
This paper reports a modeling and experimental study of the mass transfer enhancement of water deoxygenation by using a helical hollow fiber membrane (HHFM) to enable Dean vortices. Experiments demonstrated that the HHFM deoxygenating rate was doubled compared with straight hollow fiber deoxygenation. A new model to describe the HHFM deoxygenation mass
Qing-ran Kong, Yi-zhen Zhang, Hua Tian, Li-feng Fang, Ming-yong Zhou, Li-ping Zhu, Bao-ku Zhu   +6 more
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Flux improvement by Dean vortices: ultrafiltration of colloidal suspensions and macromolecular solutions

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, Manno, P, Rouch, C., Serra, C., Clifton, M.J, Aptel, P   +5 more
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The effect of slowly varying gap width on Dean vortices

Physics of Fluids A: Fluid Dynamics, 1993
Taylor–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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