A Generalized Prediction Method for Heat Transfer During Film Condensation on a Horizontal Low-Finned Tube

抄録

A theoretical model of film condensation on a horizontal low-finned tube developed in a previous work is generalized. The new model includes the effects of condensate flow and heat transfer on the fin root tube surface in the unflooded region of the tube, and the wall temperature variation between the fin root and the fin root tube surface. The expression for the flooding angle is also extended to include the case of relatively large fin spacing as compared with the fin height. It is shown that the new model can predict the average heat transfer coefficient satisfactorily over a wide range of fin spacings. An agreement of within ±20% is found between the predictions of the present model and most of the available experimental data covering 12 fluids and 31 tubes.