Mixed Convection Heat Transfer and Pressure Drop Correlations for Tube-ln-Shell Thermosyphon Heat Exchangers With Uniform Heat Flux

[+] Author and Article Information
S. D. Dahl, J. H. Davidson

Mechanical Engineering Department, University of Minnesota, 111 Church St., S.E. Minneapolis, MN 55455

J. Sol. Energy Eng 120(4), 260-269 (Nov 01, 1998) (10 pages) doi:10.1115/1.2888129 History: Received January 01, 1998; Revised March 01, 1998; Online February 14, 2008


An important issue arising from prior studies of thermosyphon heat exchangers for use in solar water heaters is the need for heat transfer and pressure drop correlations for the laminar, mixed-convection regime in which these many of these heat exchangers operate. In this paper, we present empirical correlations for tube-in-shell heat exchangers with the thermosyphon flow on the shell side. The correlations are determined for uniform heat flux on the tube walls. Ranges of Reynolds and Grashof numbers are 130 to 2,000 and 4 × 105 to 8 × 107 , respectively. Nusselt number correlations are presented in a form that combines the contributions of forced and natural convection. Mixed convection dominates forced convection heat transfer in these geometries. Pressure drop is not significantly affected by mixed convection.

Copyright © 1998 by The American Society of Mechanical Engineers
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