Studies on Dew

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Abstract
This paper deals with the heat balance of the surface of a body, on which dew condenses. Let Qr (cal/cm2 sec) be the heat loss of the body by radiation, Qe by conduction, w(g/cm2 sec) the rate of condensation of dew, and L the latent heat of vaporization. Then the equation (2) holds true, in which Qr was determined by Brunt's formula as shown by equation (3) and (4). Qc and W was determined by the formula of M. ten Bosch in the case of natural convection, and by Brasius formula in the case of laminar flow of air, applying the law of similarity. So we can obtain formulas (7) (8) (9) and (10). The equation obtained putting for these in to the (2) above was solced graphically with help of Fig. 1 and 2 and the temperature difference of air from the plane surface was obtained. Namely we can get the surface temperature and the amount of dew on a body, using the observed values of air temperature, vapor pressure and wind force. The calculated values well agree with the observed ones.

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