By Wilson W.
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Extra resources for Theoretical physics, - Mechanics and heat
Example text
As an example for drop condensation Fig. 1 shows photos taken on a vertical surface. The little droplets grow by means of subsequent condensation out of the vapor space or by coalescing. As soon as a definite drop size is reached, the drop slides off and carries along the drops lying in its path. New drops are immediately formed behind the one that has departed. They are formed predominantly out of the water film left behind and at the scratches in the surface. 4], the nucleation site density depends chiefly upon the subcooling of the heating surface.
The solution of the integrals in Eqs. 31) is, however. possible only if the turbulent diffusivity parameter c + ( y +) and the turbulent Prandtl number Pr,( y +) are known. The theories of turbulent flows provide these parameters. The various solutions of the above-mentioned equations found in the literature differ only in the expressions for the turbulent diffusivity and the turbulent Prandtl number. Instead of the turbulent diffusivity parameter 42 4 Condensation of Flowing Vapors e+, the velocity profile can be stated, because both quantities are connected with one another through Eq.
14]. Curve A represents the results of the Nusselt theory according to Eq. 43). L and with '7L = vLllL• the Reynolds number can be written Re = Mj(dn11d for the condensate film. Because the tube diameter d, which is the basis for the calculations of Fig. 7, was assumed to be much larger than the film thickness, the curvature of the condensate film has no influence on the heat transfer. The results are, therefore, also valid for condensation on a vertical smooth plate with the Reynolds number defined according to Eq.