ISSN Online: 2377-424X
ISBN Print: 0-89116-909-1
International Heat Transfer Conference 9
BUBBLE GROWTH IN FLASH EVAPORATION
Abstract
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.
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.