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Numerical Heat Transfer, Part A: Applications
An International Journal of Computation and Methodology
Volume 29, 1996 - Issue 3
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Original Articles

EFFECTS OF MULTIPLE OBSTRUCTIONS ON CONJUGATE FORCED CONVECTION HEAT TRANSFER IN TUBES

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Pages 265-279 | Received 05 Jun 1995, Accepted 17 Oct 1995, Published online: 03 Apr 2007
 

Abstract

A numerical investigation has been carried out for conjugate forced convection heat transfer in tubes with multiple obstructions. The investigation included the ranges of Reynolds number Re, thermal conductivity ratio kr, and the distance between two obstructions d of 50-600, 0.3-3.0, and 2.0-8.0, respectively. A fluid Prandtl number Pr of 7.56 is used. The obstructions create recirculation flow / back flow in the tube with increase and decrease of local heat transfer rates. Reversal in the direction of heat transfer occurs at certain locations of the tube due to the presence of the obstructions. At high values of Re and d, reversal in the direction of heat transfer occurs on the outer wall after the second obstruction. The overall heat transfer rate decreases with the decrease of kr.

Notes

Address correspondence to Dr. M. Ruhul Amin, Department of Mechanical Engineering, Montana State University, Bozeman, MT 59717-0007, USA.

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