图书馆订购 Guest

ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-518-9

5th Thermal and Fluids Engineering Conference (TFEC)
April, 5-8, 2020, New Orleans, LA, USA

IMPROVED CRITICAL HEAT FLUX CORRELATION FOR REFRIGERANT FLOWIN CIRCULAR MICROTUBES

Get access (open in a new tab) pages 455-465
DOI: 10.1615/TFEC2020.mph.032074

摘要

A new improved CHF correlation using critical quality and a modified measure of subcooling is developed for refrigerant flow in circular microtubes. The correlation showed a MAE of only 3% with R134a and 12% with R123 data, respectively. Nine different correlations were tested against the R134a data. Among the preexisting correlations, the Shah and the Zhang correlation performed well for R134a with a MAE of 16% and 19%, respectively. In general, the conventional scale correlations performed better than the microchannel correlations. Compared to the microscale correlations, the accuracy of the conventional scale correlations were impacted by critical quality. The proposed new correlation and updated version of the Wojtan-Thome and Basu correlation were trained on the R134a dataset. All the correlations were compared against the independent R123 dataset and the new correlation fared better than the existing correlations in the literature.