Introduction of image analysis for the quantification of the boiling flow heat transfer

C. Ferret, L. Falk, U. d'Ortona, A. Chenu, T.T. Veenstra

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    Abstract

    Heat transfer performances for non-boiling and boiling flow of a micro-vaporizer have been measured by standard methods (temperatures, flow rates, effective power input). The study was carried out for laminar flow (Re<25) in silicon micro-channels (5 mm×3 cm×200 μm) filled with ordered obstacles to increase the specific area. The results obtained show a strong dependence of the heat transfer on the Reynolds number for the non-boiling flow and pretty high heat transfer coefficients (1300–2500 W/m2 K) for the boiling flow. Image analysis was introduced to estimate the volume vapour fraction, which can be converted into the mass vapour fraction using the slip ratio. The estimation of this slip ratio is discussed in this paper.
    Original languageUndefined
    Pages (from-to)357-365
    JournalChemical Engineering Journal
    Volume101
    Issue number1-3
    DOIs
    Publication statusPublished - 2004

    Keywords

    • Boiling
    • Heat transfer
    • Micro-structure
    • Image analysis
    • IR-75711
    • Laminar

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