Leidenfrost evaporation of water droplet

The present paper examines the behaviour of a single large droplet levitating over a hot surface, unsteady mass of the droplet, and heat transfer. It was assumed that the evaporation from the upper surface of the droplet is negligibly small compared with the amount discharged from its lower surface,...

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Bibliographic Details
Main Author: Orzechowski, Tadeusz
Format: Conference Proceeding
Language:English
Subjects:
Dependence
Differential equations
Droplets
Evaporation
Heat balance
Heat transfer
Heat transfer coefficients
Heating
Hot surfaces
Projection
Water drops
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Summary:The present paper examines the behaviour of a single large droplet levitating over a hot surface, unsteady mass of the droplet, and heat transfer. It was assumed that the evaporation from the upper surface of the droplet is negligibly small compared with the amount discharged from its lower surface, and the heat transfer coefficient is the power function of droplet orthogonal projection onto the heating surface. Based on the photographic documentation, the dependence of the droplet projection on time was approximated. A heat balance was written in the form of a non-linear first order differential equation. The solution to the equation was included. The analytical function of droplet mass change in time was used to determine the exponent of the power dependence of the heat transfer coefficient on the orthogonal droplet projection onto the heating surface. The comparison showed the method proposed in the study could be applied to analyse the behaviour of a water drop levitating above a surface at the temperature higher than the Leidenfrost point.
ISSN:2261-236X
2274-7214
2261-236X
DOI:10.1051/matecconf/201824001029