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RESEARCH PAPERS

Framework for a Unified Model for Nucleate and Transition Pool Boiling

[+] Author and Article Information
V. K. Dhir, S. P. Liaw

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

J. Heat Transfer 111(3), 739-746 (Aug 01, 1989) (8 pages) doi:10.1115/1.3250745 History: Received September 24, 1987; Online October 20, 2009

Abstract

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.

Copyright © 1989 by ASME
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