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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Flow boiling heat transfer of R134a and R245fa in a 2.3 mm tube

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Author(s):
Tibirica, Cristiano Bigonha [1] ; Ribatski, Gherhardt [1]
Total Authors: 2
Affiliation:
[1] Univ Sao Paulo, EESC, Dept Mech Engn, BR-13566970 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER; v. 53, n. 11-12, p. 2459-2468, MAY 2010.
Web of Science Citations: 77
Abstract

This paper presents new experimental flow boiling heat transfer results in micro-scale tubes. The experimental data were obtained in a horizontal 2.3 mm I.D stainless steel tube with heating length of 464 mm, R134a and R245fa as working fluids, mass velocities ranging from 50 to 700 kg m(-2) s(-1), heat flux from 5 to 55 kW m(-2), exit saturation temperatures of 22, 31 and 41 degrees C, and vapor qualities ranging from 0.05 to 0.99. Flow pattern characterization was also performed from images obtained by high-speed filming. Heat transfer coefficient results from 1 to 14 kW m(-2) K(-1) were measured. It was found that the heat transfer coefficient is a strong function of heat flux, mass velocity and vapor quality. The experimental data were compared against ten flow boiling predictive methods from the literature. Liu and Winterton {[}3], Zhang et al. {[}5] and Saitoh et al. {[}6] worked best for both fluids, capturing most of the experimental heat transfer trends. (C) 2010 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 07/53950-5 - A theoretical and experimental study on flow boiling heat transfer and critical heat flux in microchannels
Grantee:Cristiano Bigonha Tibirica
Support type: Scholarships in Brazil - Doctorate