ANALYSIS OF NUSSELT-TYPE CONDENSATION ON A VERTICAL FLUTED SURFACE

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Abstract
This analysis considers isothermal flow and gravity-controlled condensation on a vertical fluted surface. In the initial part of the analysis, isothermal flow (drainage) which mainly occurs in the trough region of the flute, is considered, and velocity profiles, parametric dependences, etc. are studied. The simplified form of the equation of motion is solved by using the orthogonal collocation technique, which is particularly suitable for this kind of problem. In the second part, the condensation of a vapor on the fluted surface is studied with the basic assumptions required in Nusselt' s analysis. The average Nusselt number for a given length of the tube is computed by solving the surface tension-governed equation of motion, while the Reynolds number is calculated by the method mentioned earlier. As a result, the Nusselt number as a function of Reynolds number can be computed for a given set of other parameters.

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