Phase Change Phenomena on Hot Surfaces with a Variety of Wettability from Superhydrophilic to Superhydrophobic

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The present study aims to make clear the effect of surface wettability and roughness on evaporation of water drop on hot surfaces. Water drop evaporation experiment has been performed using surface samples with a variety of roughness. The experimental setup we have developed can control the diameter, impacting velocity and frequency of impinged water drops independently. The results show that(a) liquid-solid contact time increases with the decrease in impacting velocity and with the increase in drop diameter, and(b) maximum spread of water droplet increases with surface roughness.