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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Mass transfer enhancement by the onset of coherent structures in Couette-Taylor flow. Species transfer and heat transfer analogy for rotor-stator system cooling.

Get access (open in a dialog) DOI: 10.1615/IHTC12.460
6 pages

Abstract

The present paper is concerned with the experimental study of the enhancement of transfer phenomena in systems which present a thin fluid film gap. One intends to link this enhancement to the set of coherent structures in the considered flow. Thin fluid film gap is commonly encountered in rotor-stator rotating engines in turbo machinery, or in journal bearings in tribology as reported by Frene (1973). The thermal mechanism developed in such systems is rather complex. Moreov er the systems are not easily accessible for instruments. Therefore it is worthy investigating on a simpler physical model. Thin fluid films give rise to Taylor vortices as the angular rate Ω of the rotor exceeds a critical value. These vortices develop in various flow classes a long the transition regime. Their development significantly increases the wall transfer. Wereley and Luetow (1994) show that even in turbulent conditions, the residual vortex regimes may still be of certain influence.