Analytical modeling of a loop heat pipe at positive elevation

Po Ya Abel Chuang, John Michael Cimbala, Jack S. Brenizer, C. Thomas Conroy

    Research output: Contribution to journalConference article

    Abstract

    A two-phase heat transfer device, a loop heat pipe (LHP), is studied analytically. It is noted that a LHP behaves differently when it is operated against gravity (adverse elevation) or at gravity assisted (positive elevation) conditions. Steady-state modeling of LHP operating characteristics at adverse or zero elevation was broadly studied in the past. This paper presents a steady-state model of a LHP when it is operated at positive elevation based on experimental results. The effects of elevation on the trend of steady-state operating temperature (SSOT) are then studied using the newly developed steady-state model. Experimental results agree with the model predictions at adverse (88.9mm), zero, and positive (88.9mm) elevations. This steady-state model is the only model known to have the capability to predict the operating characteristics at positive elevation. The model will help to design the LHPs utilized in terrestrial applications.

    Original languageEnglish (US)
    Article numberIMECE2004-61171
    Pages (from-to)629-635
    Number of pages7
    JournalAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
    Volume375
    Issue number2
    DOIs
    StatePublished - Jan 1 2004
    Event2004 ASME International Mechanical Engineering Congress and Exposition, IMECE - Anaheim, CA, United States
    Duration: Nov 13 2004Nov 19 2004

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    Heat pipes
    Gravitation
    Heat transfer

    All Science Journal Classification (ASJC) codes

    • Mechanical Engineering
    • Fluid Flow and Transfer Processes

    Cite this

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    abstract = "A two-phase heat transfer device, a loop heat pipe (LHP), is studied analytically. It is noted that a LHP behaves differently when it is operated against gravity (adverse elevation) or at gravity assisted (positive elevation) conditions. Steady-state modeling of LHP operating characteristics at adverse or zero elevation was broadly studied in the past. This paper presents a steady-state model of a LHP when it is operated at positive elevation based on experimental results. The effects of elevation on the trend of steady-state operating temperature (SSOT) are then studied using the newly developed steady-state model. Experimental results agree with the model predictions at adverse (88.9mm), zero, and positive (88.9mm) elevations. This steady-state model is the only model known to have the capability to predict the operating characteristics at positive elevation. The model will help to design the LHPs utilized in terrestrial applications.",
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    Analytical modeling of a loop heat pipe at positive elevation. / Chuang, Po Ya Abel; Cimbala, John Michael; Brenizer, Jack S.; Conroy, C. Thomas.

    In: American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, Vol. 375, No. 2, IMECE2004-61171, 01.01.2004, p. 629-635.

    Research output: Contribution to journalConference article

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