Liquid-solid contact during flow film boiling of subcooled freon-11

Journal Article · Tue May 01 04:00:00 EDT 1990 · Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.2910401· OSTI ID:6018409

Chang, K H; Witte, L C ^[1]

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1. Univ. of Houston, TX (United States)

Liquid-solid contacts were measured for flow film boiling of subcooled Freon-11 over an electrically heated cylinder equipped with a surface microthermocouple probe. No systematic variation of the extent of liquid-solid contact with wall superheat, liquid subcooling, or velocity was detected. Only random small-scale contacts that contribute negligibly to overall heat transfer were detected when the surface was above the homogenous nucleation temperature of the Freon-11. When large-scale contacts were detected, they led to an unexpected intermediate transition from local film boiling to local transition boiling. An explanation is proposed for these unexpected transitions. A comparison of analytical results that used experimentally determined liquid-solid contact parameters to experimental heat fluxes did not show good agreement. It was concluded that the available model for heat transfer accounting for liquid-solid contact is not adequate for flow film boiling.

• OSTI ID: 6018409
• 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. 112:2; ISSN 0022-1481; ISSN JHTRA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BENCH-SCALE EXPERIMENTS
BOILING
COOLING
CYLINDERS
ECCS
ELECTRICAL EQUIPMENT
ENGINEERED SAFETY SYSTEMS
EQUIPMENT
FILM BOILING
FREONS
HALOGENATED ALIPHATIC HYDROCARBONS
HEAT FLUX
HEAT TREATMENTS
HEATING
INTERFACES
MEASURING METHODS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHASE TRANSFORMATIONS
REACTOR PROTECTION SYSTEMS
REWETTING
ROD BUNDLES
SUBCOOLING
SUPERCONDUCTING DEVICES
SUPERHEATING
VELOCITY