Time-Dependent Interaction Between Water at Supercritical Pressures and a Hot Surface

Abstract

This article presents a numerical study of the thermal and j1uiJIflow interaction driven by the sudden coniaa between satunued liquiJI water (373 J() and a hot (2300 J() spherical or plane surface. It is shown t1wJ under these conditions the sudden contaa is charoderized iniJilUly by single-phase interj'aciDJ waler and supercriJical pressure tiuu decays in time as the water is accelerated away from the interface. The sudden co_ generates (high) temperature, pressure, and density waves ttuupropagate away from the surface. The waler is modeled as an inviscid single-phase j1uiJI t1wJ behaves either as an ideal gas or a real gas with properties taken from steam tables. The idml-gas resuus are in good qualitative and quantitative (within a factor of order 1) agreement with the results based on the real-gas model. If'hm the /wt object is large (radius~10 mm), the resuJJs are insensitive to the geometry of the model (i.e., spherieal versus plane).

An integral approach for simulation of vapour film dynamics around a spherical surface

“…Although steam cannot be strictly modeled as an ideal gas, Craciunescu et al [20] have demonstrated that ideal gas relations can be applied for modeling the interaction of even liquid water at supercritical pressures with reasonable accuracy. Assuming the vapour film to behave as an ideal gas, Eq.…”