RESEARCH PAPERS: Natural Convection

Heat Transfer Characteristics of the Single-Phase, Elbow Thermosyphon

[+] Author and Article Information
G. S. H. Lock, D. Ladoon

Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G8

J. Heat Transfer 115(1), 173-177 (Feb 01, 1993) (5 pages) doi:10.1115/1.2910644 History: Received May 01, 1991; Revised June 01, 1992; Online May 23, 2008


This paper describes the results of single-phase experiments on a right-angled, or elbow, thermosyphon with the cooled section upright and the heated section horizontal. For diameter-based Rayleigh numbers less than 107.6 , the data indicate the existence of two flow regimes: fully mixed and impeded. A flow model is used to suggest how the cooled section and heated section flow patterns are coupled together. This model satisfactorily explains the effect of geometry on heat transfer, as revealed in the usual plots of Nusselt number versus Rayleigh number. Thermal performance was found to be comparable to that of the linear thermosyphon.

Copyright © 1993 by The American Society of Mechanical Engineers
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