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Evaluation of Correlations for Predicting Heat Transfer During Boiling of Carbon Dioxide Inside Channels

DOI: 10.1615/IHTC15.fbl.008435
pages 2599-2613

Mirza Shah
engineering Research Associates


KEY WORDS: Boiling and evaporation, Two-phase/Multiphase flow, carbon dioxide, tubes, heat transfer, correlations

Abstract

Applicability of available correlations to prediction of heat transfer during boiling of carbon dioxide prior to dryout in plain channels is evaluated by their comparison with a wide ranging database. Five general correlations, four correlations exclusively for CO2 and one for mini channels, were evaluated. A modified form of the author’s general correlation was also evaluated. These were compared with a database which included 1052 data points from 41 data sets for oil-free CO2 from 32 published studies. Author’s modified correlation and a published general correlation performed best with mean absolute deviation of 26% with all data. For the 31data sets which had deviations of less than 30% with at least one of these two correlations, the mean absolute deviations were about 21%. The range of data analyzed included single and multi-channels of circular, triangular, and rectangular geometries, several materials (copper, aluminum, stainless steels, nickel), electric and liquid heating of test channels, equivalent diameters from 0.51 to 14 mm, reduced pressure from 0.19 to 0.88, mass flux from 75 to 1500 kg/m2s, and boiling numbers from 0.00003 to 0.0035. The performance of the correlation for mini channels was good but not better than that of three of the other correlations. The results for all data sets and correlations are presented in tabular and graphical forms, and are discussed. Recommendations are made for application to design.

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