Abstract
Latent heat of vaporization of water is very large compared to the latent heat of vaporization of other fluids. Therefore, when evaporation is promoted by decompressing, water lowers the temperature and freezes finally. We froze without heat exchange by exposure to vacuum the water using a vacuum pump. Despite violent boiling occurs, pressure in the vessel was going down. But, finally, at freeze process, the pressure in the vessel was increased. This pressure rise is caused by that amount of evaporation increases temporarily rapidly. The rapid increase in the amount of evaporation is due to the release of latent heat during freezing. This paper was focused on the pressure temperature change and mass change when the phase change of the water is switched to sublimation from the evaporation. This is likely to provide useful information when considering a phase-change model in a special state.
Highlights
INTRODUCTIONIt is very important in ensuring the safety of the cooling to know the behavior when the liquid was in vacuum
It is very important in ensuring the safety of the cooling to know the behavior when the liquid was in vacuum. These studies have been made to subject the water to high temperature and high pressure that assumes the loss of coolant accident (LOCA) of nuclear power [1,2,3,4,5]
The authors conducted a study about the flash boiling of the cryogenic fluid and mentioned for the cryogenic fluid peculiar phenomenon [6,7,8]
Summary
It is very important in ensuring the safety of the cooling to know the behavior when the liquid was in vacuum These studies have been made to subject the water to high temperature and high pressure that assumes the loss of coolant accident (LOCA) of nuclear power [1,2,3,4,5]. The authors control the pressure that has quick propagation speed and carried out experiments on decompression boiled freezes without heat supply. This decompression boiling, better known as the flashing phenomenon, has been studied extensively, in relation to loss-of-coolant accidents (LOCA) in nuclear reactors [13,14,15]. The authors conducted experiments focusing on the evaporation amount during freezing and report the results
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