Abstract
The objective of this study is to clarify the role of ambient gas on hydrothermal waves in evaporating volatile droplets and evaporation. Experiments were conducted in a large chamber where the temperature and relative humidity of water can be controlled. An infrared camera and a CCD camera were used to determine the temperature distribution inside evaporating droplet and the profile of droplet, respectively. The liquids used here are ethanol and methanol. The minimum temperature in the droplet captured by infrared camera increased with relative humidity. Residual liquid was observed after evaporation of a volatile droplet whose volume increased with relative humidity.
