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Micro-channel flow boiling heat transfer of R-134a, R-236fa, and R-245fa

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Abstract

The rapid development of micro-thermal technologies has conveyed an increasing interest on convective boiling in micro-channels. Although there is general agreement that these systems may be able to dissipate potentially very high heat fluxes per unit volume, their heat transfer characteristics are still unclear and require investigation. The present study illustrates heat transfer data for flow boiling in a single micro-channel, for two channel diameters, namely, 510 and 790 μm, three fluids, namely, R-134a, R-236fa and R-245fa, mass velocities from 300 to 2,000 kg/m2 s, and heat fluxes up to 200 kW/m2. Stable flow boiling heat transfer data are analyzed through a parametric investigation, and are also confronted with measurements in the presence of two-phase oscillatory instabilities, which were found to significantly change the trends with respect to vapor quality.

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Acknowledgments

L. Consolini wishes to acknowledge the financial support of the European Madame Curie project HMTMIC for part of the duration of the present study.

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  1. Laboratoire de Transfert de Chaleur et de Masse (LTCM), Faculté de Sciences et Techniques de l’Ingénieur (STI), École Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland

    Lorenzo Consolini & John R. Thome

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  1. Lorenzo Consolini
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  2. John R. Thome
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Correspondence to John R. Thome.

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Consolini, L., Thome, J.R. Micro-channel flow boiling heat transfer of R-134a, R-236fa, and R-245fa. Microfluid Nanofluid 6, 731–746 (2009). https://doi.org/10.1007/s10404-008-0348-7

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  • DOI: https://doi.org/10.1007/s10404-008-0348-7

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