In this paper a theoretical investigation is reported on the effect of surface roughness on the phenomenon of Leidenfrost-levitation of droplets above a hot surface. The problem is solved first approximately using a macroscopic approach in which the roughness is replaced by a semi-empirical slip condition of the Beavers-Joseph type. Next, a microscopic model which determines the vapor flow in the close vicinity of the rough surface is solved numerically. Three basic periodic roughnesses are examined: triangular, rectangular and semi-cylindrical. The effect of the relative size of the droplet and the roughness elements on the vapor flow is investigated in the course of the study.
On the Effect of Surface Roughness on the Vapor Flow Under Leidenfrost-Levitated Droplets
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Prat, M., Schmitz, P., and Poulikakos, D. (September 1, 1995). "On the Effect of Surface Roughness on the Vapor Flow Under Leidenfrost-Levitated Droplets." ASME. J. Fluids Eng. September 1995; 117(3): 519–525. https://doi.org/10.1115/1.2817293
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