Evaporation Characteristics of Defrosting Retention Droplet on Fin Surface

To reveal the evaporation characteristics of a defrosting retention droplet on a fin surface, the effects of droplet size, fin surface wettability, fin tilt angle, and heating temperature on the droplet evaporation process were studied by a visualization experiment. The experimental results show that the droplet evaporation modes on the bare fin surface are constant contact diameter and mixing modes, and that the pining phenomenon is obvious. Constant contact angle and mixing modes are observed on the hydrophobic fin surface, and there is no spiking phenomenon. Compared to the bare fin, the evaporation time of a droplet on the hydrophobic fin surface is longer. The evaporation time on the bare surface decreases with the increase in the tilt angle. A larger tilt angle leads to an earlier denailing phenomenon. When the initial volume of the droplet is the same, with the increase in heating temperature from 30 ℃ to 40 ℃, the evaporation time decreases by 60%. In addition, a larger initial volume of the droplet leads to a longer evaporation time, but the evaporation mode remains unchanged.