The paper contains results of applying the Rohsenow pool-boiling correlation to data from the literature. Recent evidence supports the premise that the coefficient Csf and the exponent r of the Rohsenow equation vary with surface preparation technique as well as with liquid-surface combination. Eleven separate studies involving seven liquid-surface combinations and seven different surface preparation techniques have been correlated. Appropriate values of r and Csf have been determined using least squares techniques in conjunction with the Rohsenow equation to represent the various data investigated.
This paper presents pool boiling data at atmospheric pressure for mechanically polished and chemically etched 304 stainless-steel surfaces in contact with distilled water. The surfaces were prepared by these techniques to produce variation in nucleation sites. Surface roughness was varied from 2–61 rms. The results show the changes in heat transfer with varying rms surface roughness and preparation technique. The Rohsenow pool boiling correlation was used to discuss the data.
Stainless steel specimens have been coated with Teflon to produce nonwetted surfaces. The data indicate improved pool boiling heat transfer with a 0.0003-in. coating as compared to an uncoated specimen. However, thicker coatings were found to insulate the surface and impede the rate of heat transfer. Nonwetting is explained as the mechanism for enhanced heat transfer.
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