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The ratio of heat losses by conduction and by evaporation from any water surface

Bowen, I. S. (1926) The ratio of heat losses by conduction and by evaporation from any water surface. Physical Review, 27 (6). pp. 779-787. ISSN 0031-899X. doi:10.1103/PhysRev.27.779.

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It is shown that the process of evaporation and diffusion of water vapor from any water surface into the body of air above it is exactly similar to that of the conduction or "diffusion" of specific heat energy from the water surface into the same body of air. Because of this similarity it is possible to represent the ratio R of the heat loss by conduction to that by evaporation by the formula R=.46Tw-Ta/Pw-PaP/760 where Ta and Pa are the original temperature and vapor pressure of the air passing over the lake, and Tw and Pw are the corresponding quantities for the layer of air in contact with the water surface. The substitution of R times the evaporation loss for the value of the conduction heat loss in the Cummings equation for evaporation makes it an exact equation for the determination of evaporation from any water surface in terms of the net radiant energy absorbed by the water and the heat stored in the water.

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Additional Information:©1926 The American Physical Society. Received 12 March 1926. In conclusion the writer wishes to thank Professor Epstein for his derivation of Eq. (11).
Issue or Number:6
Record Number:CaltechAUTHORS:BOWpr26b
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2467
Deposited By: Tony Diaz
Deposited On:05 Apr 2006
Last Modified:08 Nov 2021 19:48

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