By Professor Dr. Karl Stephan (auth.)
I welcome the chance to have my booklet translated, due to the nice emphasis on two-phase movement and warmth move within the English-speaking international, as regarding examine, college schooling, and business perform. The 1988 Springer-Verlag variation of "Warmeiibergang beim Kondensieren und beim Sieden" has been enlarged to incorporate extra fabric on falling movie evaporation (Chapter 12) and strain drop in two-phase movement (Chapter 13). Minor error within the unique textual content have additionally been corrected. i need to precise my honest appreciation to Professor eco-friendly, Asso ciate Professor of German at Rensselaer, for his first-class translation and co operation. My thank you pass additionally to Professor Bergles for his shut cognizance to technical and linguistic info. He rigorously learn the typescript and made many reviews and proposals that helped to enhance the manuscript. i am hoping that the English version will meet with' a positive reception and give a contribution to raised knowing and to development within the box of warmth move in condensation and boiling. February 1992 ok. Stephan Preface to the German-Language variation This e-book is a continuation of the sequence "Heat and Mass move" edited by means of U. Grigull, within which 3 volumes have already been released. Its target is to acquaint scholars and training engineers with warmth move in the course of condensa tion and boiling, and is meant essentially for college students and engineers in mechanical, chemical, electric, and business processing engineering.
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Extra info for Heat Transfer in Condensation and Boiling
Sample 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.