Results 161 to 170 of about 8,927 (215)

Dean vortices in finite-aspect-ratio ducts

Journal of Fluid Mechanics, 2013
AbstractWe consider the development of Dean vortices in a curved channel of finite aspect ratio. Solutions to the axisymmetric Navier–Stokes equations are obtained through a finite-element analysis, allowing us to explore the complex and rich bifurcation pattern of the flow as the aspect ratio and Dean number vary.
Haines, Philip Edward, Denier, James Patrick, Bassom, Andrew Peter   +2 more
openaire   +2 more sources

Numerical simulation of Dean vortices: fluid trajectories

Journal of Membrane Science, 2002
Dean vortices enhance the permeate fluxes obtained with ultrafiltration systems. Although this phenomenon has been studied for micro and ultrafiltration processes, the effect of the feed concentration is not yet thoroughly understood. Several studies have reported that increasing the suspension concentration in the feed enhances the permeate flux ...
Moulin, Philippe, Moll, R, Moulin, Ph, Veyret, D., Charbit, F   +4 more
openaire   +2 more sources

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
openaire   +1 more source

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

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
openaire   +3 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

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