Visualization of Marangoni Convection Behavior between Two Surfactant Dropwises in the Process of Steam Absorption

증기흡수시(蒸氣吸收時) 계면활성제액적간(界面活性劑液滴間)에 발생(發生)하는 마랑고니대류거동(對流擧動)의 가시화(可視化)

In most absorption machines, absorption enhancement has been achieved by adding small amount of surfactant additive, which introduced the surface tension difference between absorbent and surfactant droplets in the vapor absorption. The aim of this study is to understand a basic mechanism of Marangoni convection and its effectiveness in the vapor absorption enhancement. In this study, nonflowing aqueous solution of LiBr 60 mass% was exposed to saturated water vapor under the condition that two dropwises surfactant were fixed on the absorbent surface. Our experiments achieved to visualize the enhanced heat and mass transfer phenomena by the effect of Marangoni convection through the laser holographic interferometry. Also, Marangoni convection behavior was obtained by using tracer method.