Heat transfer due to film condensation on vertical fluted tubes
Garg, Vijay Kumar
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An analysis of film condensation on a vertical fluted tube has been made considering gravitational and surface tension effects over the entire fluted surface, and using surface-oriented coordinates. For the first time surface tension effects are determined, as they should, from the shape of the condensate-vapor interface rather than the shape of the flute. Two-dimensional conduction within the condensate film as well as in the fluted tube is considered. A finite-difference solution of the highly non-linear partial differential equation for the film thickness is coupled with a finite-element solution of the conduction problem. The procedure has been tested on a sinusoidal flute with amplitude to pitch ratio ~0.2 A linear extrapolation, on a log-log basis, of our results shows good comparison with experimental data.
NPS Report NumberNPS69-84-006
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