Abstract
The present paper considers the determination of the two-phase region boundary within a simplified version of the wide-range equations of state of water and steam by Nigmatulin–Bolotnova (EOS NB) in the case the determination is based on the temperature-dependence of the saturated vapor pressure. This version of EOS NB can be used when the temperature and pressure ranges under investigation do not include the area of abnormal features of water at temperatures close to freezing ones (lower than $$10^{o}C$$ ) and when some errors in adiabatic speed of sound in a nearly-critical zone are acceptable. In particular, it is applied to numerically simulating dynamics of cavitation bubbles under their strong collapse. It is shown that in determining the two-phase region boundary within the simplified version of EOS NB on the basis of the temperature-dependencies of the saturated vapor pressure, a number of problems can occur. A simple modification of one of the known temperature-dependencies of the saturated vapor pressure, free of such problems, is presented.
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