Quantification of the water boiling heat transfer in micro-structures by image analysis

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

    Research output: Contribution to journalArticleAcademic

    Abstract

    The heat transfer performance of a micro-vaporizer has been measured by conventional methods (using temperatures, flow rates, effective power input). The study was carried out for laminar flow in channels (5 mm×3 cm×200 μm) micro-structured with square obstacles to increase the specific area. The results show that high heat transfer coefficients (1300– 2500 W m−2/C−1) can be reached in such a micro-structured channel. Image analysis was done to estimate the volume vapour fraction, which can be converted into the mass vapour fraction using a slip ratio and avoids the need for any temperature or electric power input measurements. The estimation of this slip ratio is discussed in this paper.
    Original languageUndefined
    Pages (from-to)657-668
    JournalSuperlattices and microstructures
    Volume35
    Issue number3-6
    DOIs
    Publication statusPublished - 2004

    Keywords

    • Laminar
    • Boiling
    • Heat transfer
    • Micro-structure
    • IR-76253
    • Image analysis

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