Abstract
In this paper the results of comprehensive study on the multiscale characteristics and heat transfer rate during water boiling in the pressure range from 8.8 to 103 kPa are presented. The experimental data are obtained using the modern experimental techniques, including high-speed video recording and infrared thermography. The usage of the special design of a transparent heating surface allows gaining a full set of major multiscale pool boiling characteristics. In particular, new data have been revealed on the vapor bubble growth rate and departure diameter, bubble emission frequency and nucleation site density during pool boiling in vacuum. The simple expression to predict the effect of pressure reduction on nucleation site density value is also presented.
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