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

Consolini, Lorenzo ; Thome, John

In: Microfluidics and Nanofluidics, 2009, vol. 6, no. 6, p. 731-746

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    Titel
    • Micro-channel flow boiling heat transfer of R-134a, R-236fa, and R-245fa
    Autor
    • Consolini, Lorenzo. 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
    • Thome, John. 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
    Dokumententyp
    • Postprint
    Sprache
    • Englisch
    Veröffentlicht in
    • Microfluidics and Nanofluidics, 2009, vol. 6, no. 6, p. 731-746. Springer-Verlag
    Andere elektronische Ausgabe
    OAI-PMH-ID
    • oai:doc.rero.ch:316407
    Summary
    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 790μm, three fluids, namely, R-134a, R-236fa and R-245fa, mass velocities from 300 to 2,000kg/m2s, and heat fluxes up to 200kW/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