Framework a for unified model for nucleate and transition pool boiling

Journal Article · Tue Aug 01 04:00:00 EDT 1989 · Journal of Heat Transfer; (USA)

DOI:https://doi.org/10.1115/1.3250745· OSTI ID:5236684

Dhir, V K; Liaw, S P ^[1]

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1. Mechanical, Aerospace and Nuclear Engineering Department, University of California, Los Angeles, Los Angeles, CA 90024-1597 (US)

An area and time-averaged model for saturated pool boiling heat fluxes has been developed. In the model, which is valid in the upper end of nucleate boiling and in transition boiling, the existence of stationary vapor stems at the wall is assumed. The energy from the wall is conducted into the liquid macro/micro thermal layer surrounding the stems and is utilized in evaporation at the stationary liquid-vapor interface. The heat transfer rate into the thermal layer and the temperature distribution in it are determined by solving a two-dimensional steady-state conduction equation. The evaporation rate is given by the kinetic theory. The heater surface area over which the vapor stems exist is taken to be dry. Employing experimentally observed void fractions, not only the nucleate and transition boiling heat fluxes but also the maximum and minimum heat fluxes are predicted from the model. The maximum heat fluxes obtained from the model are valid only for surfaces that are not well wetted and includes the contact angle as one of the parameters.

• OSTI ID: 5236684
• Journal Information: Journal of Heat Transfer; (USA), Journal Name: Journal of Heat Transfer; (USA) Vol. 111:3; 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
EVAPORATION
HEAT FLUX
HEAT TRANSFER
HYDROGEN COMPOUNDS
MATHEMATICAL MODELS
NUCLEATE BOILING
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POOL BOILING
TEMPERATURE DISTRIBUTION
TRANSITION BOILING
TWO-DIMENSIONAL CALCULATIONS
VOID FRACTION
WATER