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RESEARCH PAPERS: Boiling and Condensation

Suppression of Flow Boiling Nucleation

[+] Author and Article Information
G. E. Thorncroft, J. F. Klausner

Department of Mechanical Engineering, University of Florida, Gainesville, FL 32611-6300

R. Mei

Department of Aerospace Engineering, Mechanics, and Engineering Science, University of Florida, Gainesville, FL 32611-6250

J. Heat Transfer 119(3), 517-524 (Aug 01, 1997) (8 pages) doi:10.1115/1.2824130 History: Received June 18, 1996; Revised February 24, 1997; Online December 05, 2007

Abstract

A simple model is presented for estimating the ratio of the maximum to minimum cavity radius required for ebullition in two-phase flow with heat transfer. The resulting dimensionless parameter, rmax /rmin , is demonstrated to correlate flow boiling nucleation site density. As the convective heat transfer associated with bulk turbulence in two-phase flow is enhanced, rmax →rmin , and the probability of finding surface cavities whose radii lie between rmax andrmin is reduced. Thus, active nucleation sites become deactivated. A vertical flow boiling facility was fabricated in which the nucleation suppression point can be measured. Experiments conducted for mass flux ranging from 183–315 kg/m2 -s and inlet quality ranging from 0–0.151, along with data available from the literature, suggest that rmax /rmin is the leading order dimensionless parameter on which the complete suppression of nucleation sites depends. Although the suppression of nucleation sites also depends, to a certain extent, on the surface/fluid combination and heat flux, it is found that complete suppression occurs for rmax /rmin ranging from 40 to 120. This is proposed as a criterion to discriminate the purely convective regime from the nucleate boiling regime.

Copyright © 1997 by The American Society of Mechanical Engineers
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