Far from equilibrium boiling

Details Far from equilibrium boiling Far from equilibrium boiling

2010-10-15

arxiv.org/abs/1010.3227v1

Physics

Fluid Dynamics

APS Division of Fluid Dynamics 2010 Meeting Two videos included (high and low resolution)

Scientific paper

We address an experimental investigation of evaporation waves. These waves appear when a liquid contained in a vertical glass tube is suddenly depressurized from a high initial pressure down to the atmospheric one. The state of the liquid after the release of the pressure, ambient pressure and the initial temperature, is well known to be metastable when the corresponding stable state is vapour. For moderately large evaporation rates (moderately large initial to ambient pressure ratios), the initially flat vapour-liquid interface ultimately evolves into highly corrugated front which propagates downwards into the liquid with a well defined mean velocity. This mean velocity turns out to be a function of the ratio between the initial and the ambient pressures. In addition, it has been found that for lower pressure ratios, the instability is not able to develop an evaporation wave but nevertheless leads to a somewhat more complex behavior than the simple surface evaporation as it is shown in the accompanying fluid dynamics video.

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