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The dropwise condensation underneath a horizontal super-hydrophobic surfacehaving unidirectional wettability gradient is modeled with implication toenhance the rate of condensation. The mathematical model includes nucleation,growth by vapor condensation and coalescence, and drop instability arising fromforce imbalances at the three-phase contact line. The wettability gradedsurfaces, formed by a variable surface energy coating, allow the micro-drop ofcondensate to slide from the hydrophobic to the hydrophilic region without theaid of gravity. The resulting decrease in the drop sliding size shifts the dropsize distribution to smaller radii. Furthermore, this decrease in sliding sizeenhances the heat transfer rate during dropwise condensation. Simulation datahas been compared with condensation patterns for a horizontal surface andinclined surface, both with zero wettability gradients. Results obtained showthat a wettability graded surface can effectively control the condensationprocess by decreasing the cycle time of nucleation, growth and removal.

Modeling Dropwise Condensation underneath Unidirectional Wettability Graded Surfaces