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RESEARCH PAPERS

Heat Transfer From a Small Heated Region to R-113 and FC-72

[+] Author and Article Information
K. R. Samant

E. I. du Pont de Nemours and Co., Inc., Seaford, DE 19973

T. W. Simon

Mechanical Engineering Department, University of Minnesota, Minneapolis, MN 55455

J. Heat Transfer 111(4), 1053-1059 (Nov 01, 1989) (7 pages) doi:10.1115/1.3250767 History: Received March 20, 1987; Online October 20, 2009

Abstract

An experimental investigation of heat transfer from a small heated patch to a subcooled, fully developed turbulent flow is conducted. The test patch, approximately 0.25 mm long and 2.0 mm wide, is located on the floor of a small rectangular channel through which a coolant (R-113 or FC-72) is circulated. A thin film of Nichrome deposited on a quartz substrate serves as an integrated heater element and resistance thermometer. The maximum achievable heat flux with R-113, limited by the thermal decomposition temperature of the fluid, is 2.04 MW/m2 at a bulk velocity of 1.8 m/s and a high wall superheat of 80° C. The results obtained with FC-72 show large temperature excursions at the onset of nucleate boiling and a boiling hysteresis near the onset of nucleate boiling. These effects decrease with increasing velocity and/or subcooling. The heat flux at departure from nucleate boiling increases with increasing velocity and/or subcooling. A maximum heat flux of 4.26 MW/m2 at departure from nucleate boiling is observed.

Copyright © 1989 by ASME
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