On the effect of surface roughness on the vapor flow under Leidenfrost-levitated droplets
Journal Article
·
· Journal of Fluids Engineering
- Inst. de Mecanique des Fluides de Toulouse (France)
- Univ. of Illinois, Chicago, IL (United States). Mechanical Engineering Dept.
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 conditions 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.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 118735
- Journal Information:
- Journal of Fluids Engineering, Vol. 117, Issue 3; Other Information: PBD: Sep 1995
- Country of Publication:
- United States
- Language:
- English
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