Fundamental Experiments of Flash Evaporation

Abstract

To make clear the physical mechanism of flash evaporation, an experimental investigation was carried out on the phenomenon of flash evaporation which was observed when a quantity of pool water was exposed to a sudden pressure drop. As a result, the flash evaporation was found to undergo two exponential decaying processes.
Measured values of Hashing time, non-equilibrium fraction, non-equilibrium temperature and flashing zone were obtained with the range of about 3 and 5°C superheats and the variation between 40 and 80°C equilibrium temperatures, thereby deducing the empirical equations for these quantities.
Furthermore, the coefficients of flash evaporation rate were proposed from a simple consideration. Finally, the experimental results Were compared with the data which AMF obtained with actual flash evaporator.