On the effect of surface roughness on the vapor flow under Leidenfrost-levitated droplets

Journal Article · Fri Sep 01 00:00:00 EDT 1995 · Journal of Fluids Engineering

DOI:https://doi.org/10.1115/1.2817293· OSTI ID:118735

Prat, M; Schmitz, P ^[1]; Poulikakos, D ^[2]

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1. Inst. de Mecanique des Fluides de Toulouse (France)
2. 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

Related Subjects

42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES
DROPLETS
LEVITATION
BOILING
SURFACES
ROUGHNESS
GAS FLOW
POROSITY
POROUS MATERIALS
WATER VAPOR
VAPORS
LIQUID FUELS
MATHEMATICAL MODELS
EVAPORATION