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Journal of Enhanced Heat Transfer

Theory and Application in High Performance Heat and Mass Transfer

ISSN for PRINT: 1065-5131

Institutional price:	$577.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2004, Volume11

94 pages

DOI: 10.1615/JEnhHeatTransf.v11.i1

Issue price - $138.00

Increase in Mass Transfer by the Onset of Taylor-Couette-Wise Vortices

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

ABSTRACT

An experimental study on the enhancement of transfer phenomena is conducted in a thin fluid film in order to better understand the influence of the turbulence of the mean flow on the local wall transfer. Primarily, the influence of the coherent structures is investigated. Another purpose lies in what could be the convenient condition of being aware of the transfer improvement. The thin fluid film gap is commonly encountered in rotor-stator rotating engines in turbo machinery or in journal bearings in tribology [Frene, 1973]. The experiments are conducted in a simple physical model made of two coaxial cylinders with the inner one rotating. Indeed, this well-known Couette-Taylor-like apparatus [Taylor, 1923] easily provides the film flow with vortices with very accurate conditions. The Sherwood number is shown to increase as a third power of the Taylor number in the fully azimuthal laminar flow regime Sh ~ Ta^1/3. The onset of the Taylor vortices from the transition regime clearly corresponds to an increase in the slope of the previous relation.