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.
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Research Papers
Heat Transfer From a Small Heated Region to R-113 and FC-72
K. R. Samant,
K. R. Samant
E. I. du Pont de Nemours and Co., Inc., Seaford, DE 19973
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T. W. Simon
T. W. Simon
Mechanical Engineering Department, University of Minnesota, Minneapolis, MN 55455
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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. Nov 1989, 111(4): 1053-1059 (7 pages)
Published Online: November 1, 1989
Article history
Received:
March 20, 1987
Online:
October 20, 2009
Citation
Samant, K. R., and Simon, T. W. (November 1, 1989). "Heat Transfer From a Small Heated Region to R-113 and FC-72." ASME. J. Heat Transfer. November 1989; 111(4): 1053–1059. https://doi.org/10.1115/1.3250767
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