On the role of liquid-solid contact in subcooled flow film boiling from submerged bodies
Conference
·
· HTD (Publ.) (Am. Soc. Mech. Eng.); (United States)
OSTI ID:5339589
A model that accounts for liquid-solid contact during stable film boiling from submerged bodies, such as cylinders and spheres, to flowing liquids is developed in this paper. The basic premise of the model is that liquid-solid contact will occur when the vapor film thickness predicted for a perfectly smooth surface becomes less than the height of roughness elements on the surface. Estimates of contact frequencies and duration times are made and used to calculate the enhancement of heat transfer by liquid-solid contact during flow film boiling over cylinders. The application of the model to selected cases shows that the role of liquid-solid contact during film boiling can indeed be significant. The effect of contact upon both local and average heat flux densities is demonstrated. A comparison of the results of the model to a selected set of data for Freon-113 boiling from a copper cylinder shows that accounting for liquid-solid contact could bring predicted heat transfer rates up to measured values.
- Research Organization:
- Heat Transfer/Phase Change Laboratory, Department of Mechanical Engineering, University of Houston, Houston, Texas
- OSTI ID:
- 5339589
- Report Number(s):
- CONF-830702-
- Conference Information:
- Journal Name: HTD (Publ.) (Am. Soc. Mech. Eng.); (United States) Journal Volume: HTD-VOL. 23
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BOILING
COPPER
CYLINDERS
DENSITY
DIMENSIONS
ELEMENTS
ENERGY TRANSFER
FILM BOILING
FILMS
FLUID FLOW
FLUID-STRUCTURE INTERACTIONS
FLUIDS
FREONS
GASES
HALOGENATED ALIPHATIC HYDROCARBONS
HEAT TRANSFER
HEIGHT
METALS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SPHERES
SUBCOOLED BOILING
SURFACES
THICKNESS
TRANSITION ELEMENTS
VAPORS
420400* -- Engineering-- Heat Transfer & Fluid Flow
BOILING
COPPER
CYLINDERS
DENSITY
DIMENSIONS
ELEMENTS
ENERGY TRANSFER
FILM BOILING
FILMS
FLUID FLOW
FLUID-STRUCTURE INTERACTIONS
FLUIDS
FREONS
GASES
HALOGENATED ALIPHATIC HYDROCARBONS
HEAT TRANSFER
HEIGHT
METALS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SPHERES
SUBCOOLED BOILING
SURFACES
THICKNESS
TRANSITION ELEMENTS
VAPORS