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- W4237019711 abstract "This paper presents the results of an experimental study carried out with R-134a during flow boiling in a horizontal tube of 2.6 mm ID. The experimental tests included (i) heat fluxes in the range from 10 to 100 kW/m2, (ii) the refrigerant mass velocities set to the discrete values in the range of 240–930 kg/(m2 s) and (iii) saturation temperature of 12 and 22 °C. The study analyzed the heat transfer, through the local heat transfer coefficient along of flow, and pressure drop, under the variation of these different parameters. It was possible to observe the significant influence of heat flux in the heat transfer coefficient and mass velocity in the pressure drop, besides the effects of saturation temperature. In the low quality region, it was possible to observe a significant influence of heat flux on the heat transfer coefficient. In the high vapor quality region, for high mass velocities, this influence tended to vanish, and the coefficient decreased. The influence of mass velocity in the heat transfer coefficient was detected in most tests for a threshold value of vapor quality, which was higher as the heat flux increased. For higher heat flux the heat transfer coefficient was nearly independent of mass velocity. The frictional pressure drop increased with the increase in vapor quality and mass velocity. Predictive models for heat transfer coefficient in mini channels were evaluated and the calculated coefficient agreed well with measured data within a range 35% for saturation temperature of 22 °C. These results extend the ranges of heat fluxes and mass velocities beyond values available in literature, and add a substantial contribution to the comprehension of boiling heat transfer phenomena inside mini channels." @default.
- W4237019711 created "2022-05-12" @default.
- W4237019711 date "2011-02-01" @default.
- W4237019711 modified "2023-09-30" @default.
- W4237019711 title "Résumés de mémoires de Master Recherche - Universités de Bordeaux 2, Nancy 1 et Paris 11, 2009-2010" @default.
- W4237019711 doi "https://doi.org/10.1016/j.respe.2010.12.008" @default.
- W4237019711 hasPublicationYear "2011" @default.
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