Abstract
Hydrophobic surfaces on which water vapor condensation is encountered in the form of droplets rather than a film is the preferred mode of condensation because of the large heat transfer coefficient and water production rate. The droplet pattern appearing on the surface depends on its orientation and the hydrophobicity characteristics. In the present work, patterns of dropwise condensation of vapor on various engineered surfaces were recorded from experiments and compared with simulations under various conditions of subcooling for pure vapor as well as moist air. Overall, condensation patterns reveal that droplet sliding frequency is higher for surfaces with large contact angles and small contact angle hysteresis. The growth rate of droplets of water vapor present in moist air is smaller than for pure vapor condensation.
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