Heat transfer from a small heated region to R-113 and FC-72
- E.I. du Pont de Nemours and Co., Inc., Seaford, DE (United States)
- 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), Vol. 111:4; ISSN 0022-1481
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
REFRIGERANTS
NUCLEATE BOILING
SURFACES
HEAT TRANSFER
GAS TURBINES
SUPERCONDUCTORS
TURBULENT FLOW
X-RAY EQUIPMENT
BOILING
ENERGY TRANSFER
EQUIPMENT
FLUID FLOW
FLUIDS
MACHINERY
PHASE TRANSFORMATIONS
TURBINES
TURBOMACHINERY
WORKING FLUIDS
420400* - Engineering- Heat Transfer & Fluid Flow