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International Heat Transfer Conference 3

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

NATURAL CONVECTION IN HORIZONTAL CYLINDRICAL ANNULI

Ulrich Grigull
Lehrustuhl A für Thermodynamik Technische Universität München 80290 München Germany

Werner Hauf
Institut A für Thermodynamik, Technische Hochschule München Bundesrepublik Deutschland

DOI: 10.1615/IHTC3.990
pages 182-195

Abstract

By aid of a Mach-Zehnder interferometer the temperature fields of a concentric horizontal annulus, filled with atmospheric air, were made visible.From these fields the local and the mean Nusselt numbers for the inner cylinder were evaluated in a region of the Grashof number Grδ from 320 to 716 000 (δ is the gap width).The flow lines were observed by cigarette smoke using the method of normal incident light. Three different regimes of convective motion were found.
a two dimensional pseudo-conductive regime a transition regime with a three dimensional motion and a regime, having a fully developed two dimensional laminar convective flow. The local and the mean Nusselt numbers Nuδ as a function of the Grashof numbers Grδ and the relative gap width δ/di are in good agreement with the results of other investigators. These results however extend the region of study.

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