Experimental investigation of the evaporation rate of supercooled water droplets at constant temperature and varying relative humidity

摘要

Supercooled water droplets are found in clouds at high altitude. They are exposed to very low temperatures and high relative humidity. The phase change of supercooled water droplets is an interesting heat and mass transfer problem. It is of paramount interest to understand droplet dynamics in clouds and hence, rain, snow and hail generating mechanisms. Therefore, in this work freely suspended supercooled water droplets are investigated experimentally. We present the evaporation rate at a constant temperature of 268.15 K and six different relative humidities (28 % - 89 %). It is found, that the evaporation rate is linear dependent on the relative humidity.