Note on the Temperature and Evaporation of Small Droplets.

by Jerry Aroesty, Lloyd Randall Koenig

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In previous work involving the evaporation of free falling waterdrops subjected to forced convection, Kinzer and Gunn set the droplet temperature equal to the ambient wet-bulb temperature for data reduction. The standard wet-bulb temperature is based on tables prepared from experimental data, and it might be somewhat higher than the equilibrium surface temperature, for it is affected by heat conduction along the stem of the thermometer. Thus, droplet temperatures used previously were somewhat high, and the error became larger as the droplet size (velocity) decreased. This argument would provide an explanation for the lack of evidence of a ventilation effect on droplets smaller than 100 mu in diameter but does not contribute to an understanding of the larger-than-expected ventilation effects for droplets somewhat larger. 8 pp. Ref.

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