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International Heat Transfer Conference 3

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

NATURAL CONVECTION HEAT TRANSFER IN SHORT VERTICAL CHANNELS INCLUDING THE EFFECTS OF STAGGER

N. Sobel
New York University New York, N.Y.

Fred Landis
Department of Mechanical Engineering, University of Wisconsin, Milwaukee, WI 53201

Wheeler K. Mueller
Mechanical Engineering, New York University

DOI: 10.1615/IHTC3.920
pages 121-125

Abstract

Natural convection air flows were studied experimentally in straight and staggered, short vertical channels with constant heat flux boundary conditions. Straight channel Nusselt numbers agreed with the semi-empirical predictions of Elenbaas (1) and the analytical predictions of Engel (4). When channel stagger was introduced into very short channels, the Nusselt number increased significantly and the exit wall temperatures were reduced. This effect persisted beyond the meeting point of the two wall boundary layers. However, as channel length is increased, the relative advantage of stagger decreases and performance falls eventually below that of a single straight channel.

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