Abstract
As the result of our experiments conducted in order to measure the distribution of vapor pressure on the surface of evaporating water and on that of the shijo of the both model and actual shijokas, and to measure the thickness of the boundary layer of the evaporating water, the following were obtained;
(1) The following experimental formula can be established in connection with the thickness of the boundary layer (S) and the diameter of the evaporating water surface (d);
δ/d=2.06 (Pγ.Gγ) -0.22
Pγ.=ν/D
Gγ.=g.d3/ν2|ρ′/ρo-1|
ν: kinematic coef. of velocity of the air, D: coef. of vapor diffusion, g: gravity acceleration, ρ′, ρo: vapor density in the air of water surface and outside
(2) The thickness of the boundary layer formed on the surface of the shilo is approximately 4-6mm no matter how the conditions may change.
