Abstract
The influence of environmental water vapor on the evaporation rate of a liquid droplet has been examined by suspending single droplets of distilled water and ethanol in hot air flow containing water vapor. The experimental results indicate that when the droplet is of distilled water and the air flow temperature far exceeds the boiling point, the evaporation rate constant is not affected by the water vapor in the air. In contrast, when the droplet is composed of ethanol, the evaporation rate constant increases with the addition of water vapor to the air flow. In that case, the water vapor in the air is condensed at the droplet surface where the equilibrium temperature is below that of water condensation, and consequently the heat of condensation given to the droplet promotes evaporation. In the latter period of the evaporation process when the test liluid has evaporated almost completely, the evaporating liquid is composed mostly of water.
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