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RESEARCH PAPERS

Convective Nucleate Boiling on a Heated Surface Cooled by an Impinging, Planar Jet of Water

[+] Author and Article Information
D. T. Vader, F. P. Incropera, R. Viskanta

Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

J. Heat Transfer 114(1), 152-160 (Feb 01, 1992) (9 pages) doi:10.1115/1.2911241 History: Received January 07, 1991; Revised June 30, 1991; Online May 23, 2008

Abstract

Convective nucleate boiling has been studied on a flat, upward facing, constant heat flux surface cooled by a planar, impinging water jet. Surface temperature distributions are presented for jet velocities between 1.8 and 4.5 m/s, fluid temperatures of 30, 40, and 50°C, and heat fluxes between 0.25 and 2.5 MW/m2 . Although the critical Reynolds number, Rex*,c , is independent of heat flux for q” < q”ONB , boiling incipience strongly affects the transition to a turbulent boundary layer. As the heat flux increases, vapor bubbles of 1 mm diameter first appear at the point of maximum surface temperature, which also marks the onset of boundary layer turbulence. The leading edge of these bubbles moves toward the stagnation line and Rex*,c decreases with further increases in heat flux. Acceleration in the stagnation region stabilizes the flow, however, so that boundary layer turbulence is restricted to x/wj ≳ 1.6. With increasing heat flux, vigorous nucleate boiling covers more of the heater and surface temperature variations decrease.

Copyright © 1992 by The American Society of Mechanical Engineers
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