Heat transfer from a small heated region to R-113 and FC-72

Journal Article · Wed Nov 01 04:00:00 EST 1989 · Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.3250767· OSTI ID:6105897

Samant, K R ^[1]; Simon, T W ^[2]

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1. E.I. du Pont de Nemours and Co., Inc., Seaford, DE (United States)
2. Univ. of Minnesota, Minneapolis (United States)

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/m{sup 2} at a bulk velocity of 1.8 m/s and a high wall superheat of 80C. The results obtained with FC-72 show large temperature excursions at the onset of nucleate boiling and a boiling increases with increasing velocity and/or subcooling. A maximum heat flux of 4.26 MW/m{sup 2} at departure from nucleate boiling is observed.

• OSTI ID: 6105897
• Journal Information: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 111:4; ISSN 0022-1481; ISSN JHTRA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BOILING
ENERGY TRANSFER
EQUIPMENT
FLUID FLOW
FLUIDS
GAS TURBINES
HEAT TRANSFER
MACHINERY
NUCLEATE BOILING
PHASE TRANSFORMATIONS
REFRIGERANTS
SUPERCONDUCTORS
SURFACES
TURBINES
TURBOMACHINERY
TURBULENT FLOW
WORKING FLUIDS
X-RAY EQUIPMENT