Measurements were made of the rate of natural evaporation into a stagnant argon or helium atmosphere from a rectangular-shaped surface of liquid sodium placed on the bottom floor of an evaporation test box. The tests were carried out at various levels of sodium temperature and inert gas pressure under conditions where mist formation could be expected. The values obtained as the Sherwood number were compared with those predicted by various theoretical models. The overall results revealed that the enhancement of evaporation brought about by mist formation significantly increased as the sodium temperature did. It was concluded that the previous theoretical models were not adequate for obtaining correct values for the evaporation rate.

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