Abstract
Local heat transfer and pressure drop measurements were made during condensation of CFC11 in horizontal microfin tubes. A smooth tube and two microfin tubes with different fin dimensions were tested. Flow observation study with use of an industrial borescope revealed that the condensate flowed along the grooves, and a thick condensate film covered fins in the lower part of the tube in the low quality region. Static pressure gradients in the microfin tubes were up to 70% larger than that in the smooth tube. A correlation equation for the local frictional pressure gradient was derived, in which the effect of refrigerant mass velocity was introduced on the basis of the flow regime consideration. The measured frictional pressure gradient data were found by the present method to have a mean absolute deviation of 8.3%.
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