MATEC Web Conf.
Volume 240, 2018XI International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT 2018)
|Number of page(s)||5|
|Section||Heat, Mass and Momentum Transfer|
|Published online||27 November 2018|
Leidenfrost evaporation of water droplet
Kielce University of Technology, Al. Tysiąclecia PP 7, 25-314 Kielce, Poland
* Corresponding author: firstname.lastname@example.org
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.
© The Authors, published by EDP Sciences, 2018
This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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