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International Heat Transfer Conference 6

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

RELATIVE BEHAVIOR OF WATER AND ORGANICS IN BOILING

A. Singh
General Electric Company, Nuclear Energy Division, San Jose, California

Borivoje B. Mikic
Massachusetts Institute of Technology, Dept. of Mechanical Engineergin, Cambridge, MA USA

Warren Max Rohsenow
Massachusetts Institute of Technology, Cambridge, U.S.A.

DOI: 10.1615/IHTC6.3750
pages 163-168

Abstract

Data were taken with water and methanol boiling on different copper surfaces with varying degree of roughness and prepared by different preparation techniques. It was observed that the population density of active sites and the boiling heat flux increased with increasing surface roughness at a fixed value of wall superheat. For a given boiling heat flux, the ratio of surface superheats required for the two fluids is observed to remain constant within the range of experiments and unaffected by the value of surface roughness or the surface preparation technique. This indicates that for any given surface, if q/A vs ΔТ characteristics of one fluid are known, then knowing the relative behavior of the two fluids for any arbitrary surface (within the range of experiments), the q/A vs ΔТ behavior of the other fluid for the given surface can be estimated. The transient heat flux model developed by Mikic and Rohsenow is shown to predict the nucleate boiling heat flux for the two fluids at atmospheric pressure. At a given heat flux, relative superheats for different fluids, e.g. organics and water, boiling on an ordinary copper surface are predicted and compared with data from other sources.

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