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Effect of condensate flow rate, surface tension, density and vapor velocity on condensate retention of wire wrapped tubes

Simulated condensation has been conducted on three wire wrapped tubes having
 same root diameter but different fin spacing of 1.5mm, 2mm and 2.5mm.
 Different fluids (Ethanol, Ethylene Glycol and Water) are used for
 condensation by providing them to the tubes through tiny holes in inter-fin
 spacing on the top of the surface of tubes. The major parameters are to be
 controlled in this research are fin spacing, vapor velocity, condensate flow
 rate and ratio of surface tension to density of the fluid. Obtained results
 show that flooding angle (calculated from the top of the tube to the level
 where fluid fills the fin) rises by increasing fin spacing. Also, retention
 angles increase by reducing ratio of surface tension to density of fluid.
 Acute flooding angles at zero air velocity and zero flow rate, elevates by
 increasing air velocity. However, obtuse flooding angles at static
 conditions drop by reducing air velocity. An interesting result is obtained
 regarding retention angle which remains almost even for the higher
 condensation flow rates until the tube gets inundated with condensation.
 Moreover, critical flow rates for all the tubes against using different
 working fluids are measured. Results obtained for static conditions have
 good correspondence with already available authentic data for flooding
 angle. Pictures showing condensate retention angles have been included in
 this paper.