Thermal-accommodation measurement of helium on a suspended water droplet
- 1 April 1988
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 37 (7) , 2557-2561
- https://doi.org/10.1103/physreva.37.2557
Abstract
An innovative method for determining the thermal-accommodation coefficients of gases by means of monitoring the Mie scattering from a single suspended water droplet is described. The heat exchange between the gas molecules and the suspended droplet is analyzed by considering the simultaneous mass- and heat-transfer processes during droplet growth by condensation in a gas–water-vapor environment. Measurements have been carried out for helium with water-vapor-to-helium ratios in the range of 1:0.5 to 1:2.5. The thermal conductivity of this mixture is found to be best represented by its reciprocal average. The thermal-accommodation coefficient of helium on water surfaces is determined to be 0.65±0.05, as compared to unity for water vapor on water surfaces.Keywords
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