Effects of surface roughness and tube materials on the filmwise condensation heat transfer coefficient at low heat transfer rates

Rin Yun, Jaeheok Heo, Yongchan Kim

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    The laminar filmwise condensation heat transfer coefficient on the horizontal tubes of copper and stainless steel was investigated. The outside diameter of the tubes was 15.88 mm, and the tube thickness ranged from 1.07 to 1.6 mm. The polished stainless steel tube had an RMS surface roughness of 0.37 μm, and commercial stainless steel tubes had maximum surface roughness of 15 μm. The tests were conducted at saturation temperatures of 20 and 30 °C, and liquid wall subcoolings from 0.4 to 2.1 °C. The measured condensation heat transfer coefficients were significantly lower than the predicted data by the Nusselt analysis when the ratio of the condensate liquid film thickness to the surface roughness, δ/Rp-v, was relatively low. When the condensate liquid film was very thin, tube material affected the condensation heat transfer coefficient in the filmwise condensation.

    Original languageEnglish
    Pages (from-to)445-450
    Number of pages6
    JournalInternational Communications in Heat and Mass Transfer
    Volume33
    Issue number4
    DOIs
    Publication statusPublished - 2006 Apr

    Bibliographical note

    Funding Information:
    This work was jointly supported by the Korea Science and Engineering Foundation (Grant No. R01-2002-000-00481-0), and the Carbon Dioxide Reduction and Sequestration Center, one of the 21st Century Frontier R&D Programs in the Ministry of Science and Technology of Korea.

    Keywords

    • Condensate liquid film thickness
    • Filmwise condensation heat transfer
    • Surface roughness
    • Tube thermal conductivity

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics
    • General Chemical Engineering
    • Condensed Matter Physics

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