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International Heat Transfer Conference 12

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

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

Laurent Gbahoue
Laboratoire d’Etudes Thermiques UMR CNRS 6608, ESIP, 40, avenue du Recteur Pineau, 86022 Poitiers cedex, France

Emmanuel Guillot
Laboratoire d'Etudes Thermiques UMR CNRS 6608, ESIP, 40, avenue du Recteur Pineau 86022 Poitiers cedex, France

Amine Mehel
Laboratoire d'Etudes Thermiques UMR CNRS 6608, ESIP, 40, avenue du Recteur Pineau 86022 Poitiers cedex, France

Serguei Martemianov
Laboratoire d'Etudes Thermiques UMR CNRS 6608, ESIP, 40, avenue du Recteur Pineau 86022 Poitiers cedex, France

DOI: 10.1615/IHTC12.460
6 pages

Abstrakt

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.

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