Numerical study of turbulent natural convection in an innovative air cooling system

Fan-bill B. Cheung, D. Y. Sohn

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    The process of buoyancy-induced turbulent convection in an asymmetrically heated vertical channel is studied numerically to simulate the situation of flow development and heat transfer in an innovative air cooling system. An upgraded two-equation closure model is employed to describe the turbulent motion, and the problem is formulated with proper account of the effects of property variations and surface radiation between the bounding watts. The governing system is solved by an implicit finite-difference method. Variable grid sizes are used in the numerical computation, and the velocity-pressure coupling is treated by a technique involving numerical iteration with underrelaxation. The accuracy of the present computational scheme is demonstrated by comparing the predicted results with available experimental data. Axial variations of watt temperatures and downstream evolution of local velocity and temperature fields are determined as functions of various controlling parameters of the system.

    Original languageEnglish (US)
    Pages (from-to)467-487
    Number of pages21
    JournalNumerical Heat Transfer; Part A: Applications
    Volume16
    Issue number4
    DOIs
    StatePublished - Jan 1 1989

    Fingerprint

    air cooling
    cooling systems
    Natural Convection
    Cooling systems
    Natural convection
    free convection
    Cooling
    Numerical Study
    Air
    Buoyancy
    buoyancy
    Finite difference method
    closures
    iteration
    Temperature distribution
    temperature distribution
    convection
    velocity distribution
    heat transfer
    grids

    All Science Journal Classification (ASJC) codes

    • Numerical Analysis
    • Condensed Matter Physics

    Cite this

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    abstract = "The process of buoyancy-induced turbulent convection in an asymmetrically heated vertical channel is studied numerically to simulate the situation of flow development and heat transfer in an innovative air cooling system. An upgraded two-equation closure model is employed to describe the turbulent motion, and the problem is formulated with proper account of the effects of property variations and surface radiation between the bounding watts. The governing system is solved by an implicit finite-difference method. Variable grid sizes are used in the numerical computation, and the velocity-pressure coupling is treated by a technique involving numerical iteration with underrelaxation. The accuracy of the present computational scheme is demonstrated by comparing the predicted results with available experimental data. Axial variations of watt temperatures and downstream evolution of local velocity and temperature fields are determined as functions of various controlling parameters of the system.",
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    Numerical study of turbulent natural convection in an innovative air cooling system. / Cheung, Fan-bill B.; Sohn, D. Y.

    In: Numerical Heat Transfer; Part A: Applications, Vol. 16, No. 4, 01.01.1989, p. 467-487.

    Research output: Contribution to journalArticle

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