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International Heat Transfer Conference 11

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

HEAT TRANSFER FROM A DISCRETE HEAT SOURCE IN CONFINED AIR JET IMPINGEMENT

Vincent P. Schroeder
Product Research and Development Pycon, Inc. 3500 Thomas Rd., Suite E Santa Clara, California 95054 USA

Suresh V. Garimella
NSF Cooling Technologies Research Center, School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907-2088 USA

DOI: 10.1615/IHTC11.2250
pages 451-456

Abstract

The local heat transfer from a square heat source to single, axisymmetric, confined air jets was experimentally investigated. The jets issued from short, square-edged orifices with a still-developing velocity profile on to a foil heat source that produced a constant heat flux. The orifice plate and the surface containing the heat source were mounted opposite each other in a parallel-plates arrangement to effect radial outflow of the spent fluid. The local surface temperature was mapped as a function of the jet Reynolds number (5 000 ≤ Re ≤ 20000), orifice-to-heat source spacing (0.5 ≤ H/d ≤ 4), and orifice diameter (1.59 ≤ d ≤ 12.7 mm). For the larger diameter jets, the stagnation heat transfer coefficient decreased with decreasing H/d and secondary peaks in the heat transfer coefficient were observed. In contrast, the stagnation heat transfer coefficient for the smaller diameter jets increased with decreasing H/d, and secondary peaks were not present. Predictive correlations for the stagnation and average Nusselt numbers are presented.

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