BUBBLE GROWTH IN FLASH EVAPORATION
The objective of this study is to investigate numerically the transient growth of a vapor bubble in a liquid under flash evaporation conditions, i.e. when the surrounding pressure field is decaying with time.
Results are obtained for different flash-down pressure drops, pressure decay rates, Peclet numbers, and salt concentrations. Some of the primary conclusions are : (1) the growth curves show a t3/2 power dependence of the radius as a function of time t, (2) higher externally-imposed rates of pressure decay increase the bubble growth rates, up to three-fold in the cases considered in this study. Comparison to other researchers' experimental and theoretical results is favorable.
The primary contribution is in considering a prescribed transient driving pressure difference, and limiting cases of liquid temperature profiles, both considerations bringing flash evaporation bubble growth analysis much closer to reality than accomplished so far.