Session H37: General Fluid Dynamics and Phenomena
8:00 AM–11:00 AM, Tuesday, March 22, 2005
LACC Room: 512
Sponsoring Unit:
DFD
Chair: Gary Williams, UCLA
Abstract ID: BAPS.2005.MAR.H37.3
Abstract: H37.00003 : Leidenfrost Effect of Water Drops on the Surface of Liquid Nitrogen
8:24 AM–8:36 AM
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Abstract 
Authors:
Heetae Kim
Gary A. Williams
(UCLA)
The properties of small water drops floating on the surface of liquid nitrogen are studied, a type of Leidenfrost effect. Heat extracted from the water drop evaporates the liquid nitrogen under it, forming a gaseous dimple that the drop floats on, spinning and moving with constant speed across the nitrogen. The temperature of the drop falls with time, finally reaching a Leidenfrost temperature below 0\r{}C where the ice crystal sinks into the nitrogen. We have measured the time that the drop floats as a function of the drop size and the initial temperature of the water. The time increases linearly with both the drop size and with temperature, in agreement with a simplified force-balance theory including thermal conduction and the vapor and surface tension forces.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2005.MAR.H37.3