Emmanuel Maitre - Homepage
Emmanuel Maitre - Homepage

Leidenfrost effect

Abstract:
While heating water in a pan, small vapor bubbles are created and detach from the bottom at some frequency. This frequency increases as the temperature difference between the pan bottom and water increases, up to the point when a vapor layer is created. This layer acts as a barrier for the heat flux which reduces dramatically the phase change rate. This is the Leidenfrost effect. This effect also occurs when a droplet falls slowly on a support heated at a temperature significantly hotter than the liquid’s boiling point, so that an insulating vapor layer is created and prevents that droplet to burn out instantly. The random release of vapor under the droplet creates a motion. One challenge is to be able to somehow control the droplet motion through this vapor release.

Publications:
R. Denis, H. Khalil, S. Labbé and E. Maitre, Axisymmetric Level Set model of Leidenfrost effect, in preparation.

Gallery:

An (erroneous) output of our current axisymmetric code, which is still in development (picture by Roland Denis).
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leidenfrost.txt · Last modified: 2010/12/30 10:27 by maitre