Evaporation of a Group of Droplets under Subatmospheric Pressure

概要

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An experimental study was made of the evaporation of a group of droplets falling down freely in a quiescent air under subatmospheric pressure. An ultrasonic atomizer was provided for producing a stream of fine water droplets. The evaporation rate was determined from the change of diameter of droplets measured at different heights with the use of liquid immersion technique. An attempt was also made to develop a mathematical model for predicting the measured results. The results showed that the evaporation rate increased with a rise of air temperature, and with a decrease in pressure and mass fraction of water vapor in air. A decrease in the distance between the center of neighboring droplets caused a remarkable decrease in the evaporation rate. The shell model proved to be a potentially useful way for analyzing the evaporation of a group of droplets.
一般社団法人日本機械学会の論文