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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.)

Heat transfer during convective boiling inside microchannels

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Author(s):
Kanizawa, Fabio Toshio [1] ; Tibirica, Cristiano Bigonha [1] ; Ribatski, Gherhardt [1]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Sao Carlos Sch Engn, Heat Transfer Res Grp, BR-05508 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER; v. 93, p. 566-583, FEB 2016.
Web of Science Citations: 24
Abstract

This paper presents experimental results for the heat transfer coefficient during flow boiling of refrigerants R134a, R245fa and R600a inside small diameter tubes plus a new heat transfer predictive method. The experimental database comprises 2047 data points covering tube internal diameter ranging from 0.38 to 2.6 mm, mass velocities from 49 to 2200 kg/m(2)s, and heat fluxes up to 185 kW/m(2). The data are parametrically analyzed and the effects of the experimental parameters (mass velocity, tube diameter, heat flux, refrigerant type and saturation temperature) on the heat transfer coefficient and dryout vapor quality are identified. In general, the heat transfer coefficient increases with increasing mass velocity, heat flux and saturation temperature, and decreasing the tube diameter. Moreover, the dryout vapor quality decreases with increasing mass velocity and vapor specific volume. The method proposed in the present study predicted 97% of the experimental results within an error margin of 30% and with a mean absolute error of 11%. The new method provided better predictions of its database than seven of the most quoted predictive methods available in the literature, and was also accurate to predict independent databases. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 10/20670-2 - Theoretical and experimental study of void fraction and flow pattern induced vibration on tubes bundle
Grantee:Fabio Toshio Kanizawa
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 14/06902-9 - Theoretical and experimental study of flow induced vibration during external two-phase flow across tube bundle
Grantee:Fabio Toshio Kanizawa
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 15/00854-5 - Characterization of external two-phase flow across tube bundles
Grantee:Fabio Toshio Kanizawa
Support type: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 11/01372-3 - Study of two-phase flow and thermal instabilities during convective boiling in micro-scale channels
Grantee:Cristiano Bigonha Tibirica
Support type: Scholarships in Brazil - Post-Doctorate