Abstract
Evaporation heat transfer of a saturated falling film on a horizontal tube was studied experimentally. Experiments were performed on a vertical row of horizontal tubes, 25 mm in diameter and 50 mm in vertical pitch with saturated R-11 at a pressure of 0.2 MPa in the range of film Reynolds number from 10 to 2000. The influence of liquid feeding system and method on an instrumented evaporation tube, and the effect of dummy tubes between a liquid feeder and the test tube were also investigated. The data were then compared with existing correlations in the literature and with the analytical results developed in the first report. The analytical results were found to underestimate the data by about 20% for all Reynolds numbers over 50. An empirical correlation to reproduce the present data with sufficient accuracy was developed as Num = (Re-2/3f + Re0.3f Pr0.25/100)1/2
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