Interfacial and plate temperature histories during dropwise condensation in the presence of non-condensibles

F.L.A. Ganzevles, C.W.M. Geld, van der

    Research output: Chapter in Book/Report/Conference proceedingChapterAcademicpeer-review

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    Abstract

    Measurements with a thermograph, spectral range 2,0-5,6 (µm, reveal temperature gradients in liquid drops that condense from a gas mixture with noncondensibles present. They indicate the presence of Marangoni convection that may explain the finding that the average thermal resistance of the condensate in plastic compact heat exchangers is lower than the expected value based on pure conduction. Histories of temperature fields of condenser plates exhibit, amongst other things, the importance of drainage by the large drops and the predicted linear decrease of the averaged interface temperature in the flow direction. Dedicated experiments with an initially homogeneous binary drop show that Marangoni flow can also be driven by concentration gradients at the interface, sustained by refreshing from the bulk liquid. It is unclear whether this effect manifests itself in heat exchangers.
    Original languageEnglish
    Title of host publicationApplied optical measurements
    EditorsM. Lehner, D. Mewes
    Place of PublicationBerlin
    PublisherSpringer
    Pages171-184
    ISBN (Print)3-540-66173-5
    DOIs
    Publication statusPublished - 1999

    Fingerprint

    heat exchangers
    condensation
    histories
    Marangoni convection
    condensers
    thermal resistance
    drainage
    gas mixtures
    condensates
    temperature gradients
    temperature distribution
    plastics
    conduction
    gradients
    temperature
    liquids

    Cite this

    Ganzevles, F. L. A., & Geld, van der, C. W. M. (1999). Interfacial and plate temperature histories during dropwise condensation in the presence of non-condensibles. In M. Lehner, & D. Mewes (Eds.), Applied optical measurements (pp. 171-184). Berlin: Springer. https://doi.org/10.1007/978-3-642-58496-1_11
    Ganzevles, F.L.A. ; Geld, van der, C.W.M. / Interfacial and plate temperature histories during dropwise condensation in the presence of non-condensibles. Applied optical measurements. editor / M. Lehner ; D. Mewes. Berlin : Springer, 1999. pp. 171-184
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    abstract = "Measurements with a thermograph, spectral range 2,0-5,6 (µm, reveal temperature gradients in liquid drops that condense from a gas mixture with noncondensibles present. They indicate the presence of Marangoni convection that may explain the finding that the average thermal resistance of the condensate in plastic compact heat exchangers is lower than the expected value based on pure conduction. Histories of temperature fields of condenser plates exhibit, amongst other things, the importance of drainage by the large drops and the predicted linear decrease of the averaged interface temperature in the flow direction. Dedicated experiments with an initially homogeneous binary drop show that Marangoni flow can also be driven by concentration gradients at the interface, sustained by refreshing from the bulk liquid. It is unclear whether this effect manifests itself in heat exchangers.",
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    Interfacial and plate temperature histories during dropwise condensation in the presence of non-condensibles. / Ganzevles, F.L.A.; Geld, van der, C.W.M.

    Applied optical measurements. ed. / M. Lehner; D. Mewes. Berlin : Springer, 1999. p. 171-184.

    Research output: Chapter in Book/Report/Conference proceedingChapterAcademicpeer-review

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    AB - Measurements with a thermograph, spectral range 2,0-5,6 (µm, reveal temperature gradients in liquid drops that condense from a gas mixture with noncondensibles present. They indicate the presence of Marangoni convection that may explain the finding that the average thermal resistance of the condensate in plastic compact heat exchangers is lower than the expected value based on pure conduction. Histories of temperature fields of condenser plates exhibit, amongst other things, the importance of drainage by the large drops and the predicted linear decrease of the averaged interface temperature in the flow direction. Dedicated experiments with an initially homogeneous binary drop show that Marangoni flow can also be driven by concentration gradients at the interface, sustained by refreshing from the bulk liquid. It is unclear whether this effect manifests itself in heat exchangers.

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