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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

A New Flow Pattern Based General Correlation for Heat Transfer During Condensation in Horizontal Tubes

Get access (open in a dialog) DOI: 10.1615/IHTC15.cds.008645
pages 671-685

Sinopsis

A flow pattern based general correlation for heat transfer during condensation inside horizontal tubes is presented. It has been developed by modifying the author’s published general correlation (Shah 2009) which had been verified with data covering an extremely wide range of parameters for horizontal and vertical tubes. That correlation uses three empirically derived heat transfer regimes in which different heat transfer formulas are applied. While these heat transfer regimes provide satisfactory agreement with data, they do not have any clear physical meaning. For gaining insight into the mechanisms and physical phenomena involved, it is much preferable to have predictive methods based on flow patterns. In the correlation presented here, the heat transfer regimes of the published Shah correlation have been replaced by flow pattern regimes. The new correlation is compared to a data base that contains 87 data sets from 38 studies. It includes 21 fluids (water, carbon dioxide, DME, halocarbon refrigerants, and hydrocarbon refrigerants), tube diameters from 2 to 49 mm, reduced pressures from 0.0023 to 0.95, and flow rates from 13 to 820 kg/m2s. The 1528 data points are predicted with a mean absolute deviation of 16.7 %, with flow patterns by the El Hajal et al. map for condensing flows. The same data base is also compared to the published Shah correlation as well as several other general correlations, including those by Ananiev et al., Cavallini et al., Traviss et al., and Moser et al.. The results of data analyses are discussed and presented in graphical and tabular forms.