Publication Date:
2019-07-13
Description:
The initiation of boiling of water on metal surfaces during pressure transients has been investigated. The data were obtained by a new technique in which light beam fluctuations and a pressure signal were simultaneously recorded on a dual beam oscilloscope. The results obtained agreed with those obtained using high speed photography. It was found that, for water temperatures between 90-150 C, the wall superheat required to initiate boiling during a rapid pressure transient was significantly higher than required when the pressure was slowly reduced. This result is explained by assuming that a finite time is necessary for vapor to fill the cavity at which the bubble originates. Experimental measurements of this time are in reasonably good agreement with calculations based on the proposed theory. The theory includes a new procedure for estimating the coefficient of vaporization.
Keywords:
THERMODYNAMICS AND COMBUSTION
Type:
ASME PAPER 73-WA/HT-25
,
Winter Annual Meeting; Nov 11, 1973 - Nov 15, 1973; Detroit, MI
Format:
text
Permalink
