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    On the Scaling of Pool Boiling Heat Flux With Gravity and Heater Size

    Source: Journal of Heat Transfer:;2012:;volume( 134 ):;issue: 001::page 11502
    Author:
    Rishi Raj
    ,
    John McQuillen
    ,
    Jungho Kim
    DOI: 10.1115/1.4004370
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: A framework for scaling pool boiling heat flux is developed using data from various heater sizes over a range of gravity levels. Boiling is buoyancy dominated for large heaters and/or high gravity conditions and the heat flux is heater size independent. The power law coefficient for gravity is a function of wall temperature. As the heater size or gravity level is reduced, a sharp transition in the heat flux is observed at a threshold value of Lh /Lc = 2.1. Below this threshold value, boiling is surface tension dominated and the dependence on gravity is smaller. The gravity scaling parameter for the heat flux in the buoyancy dominated boiling regime developed in the previous work is updated to account for subcooling effect. Based on this scaling parameter and the transition criteria, a methodology for predicting heat flux in the surface tension dominated boiling regime, typically observed under low-gravity conditions, is developed. Given the heat flux at a reference gravity level and heater size, the current framework allows the prediction of heat flux at any other gravity level and/or heater size under similar experimental conditions. The prediction is validated using data at over a range of subcoolings (11 °C ≤ ΔTsub ≤ 32.6 °C), heater sizes (2.1 mm ≤ Lh ≤ 7 mm), and dissolved gas concentrations (3 ppm ≤ cg ≤ 3500 ppm). The prediction errors are significantly smaller than those from correlations currently available in the literature.
    keyword(s): Boiling , Pool boiling , Subcooling , Heat flux , Gravity (Force) AND Heat transfer ,
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      On the Scaling of Pool Boiling Heat Flux With Gravity and Heater Size

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    contributor authorRishi Raj
    contributor authorJohn McQuillen
    contributor authorJungho Kim
    date accessioned2017-05-09T00:52:32Z
    date available2017-05-09T00:52:32Z
    date copyrightJanuary, 2012
    date issued2012
    identifier issn0022-1481
    identifier otherJHTRAO-27930#011502_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/149562
    description abstractA framework for scaling pool boiling heat flux is developed using data from various heater sizes over a range of gravity levels. Boiling is buoyancy dominated for large heaters and/or high gravity conditions and the heat flux is heater size independent. The power law coefficient for gravity is a function of wall temperature. As the heater size or gravity level is reduced, a sharp transition in the heat flux is observed at a threshold value of Lh /Lc = 2.1. Below this threshold value, boiling is surface tension dominated and the dependence on gravity is smaller. The gravity scaling parameter for the heat flux in the buoyancy dominated boiling regime developed in the previous work is updated to account for subcooling effect. Based on this scaling parameter and the transition criteria, a methodology for predicting heat flux in the surface tension dominated boiling regime, typically observed under low-gravity conditions, is developed. Given the heat flux at a reference gravity level and heater size, the current framework allows the prediction of heat flux at any other gravity level and/or heater size under similar experimental conditions. The prediction is validated using data at over a range of subcoolings (11 °C ≤ ΔTsub ≤ 32.6 °C), heater sizes (2.1 mm ≤ Lh ≤ 7 mm), and dissolved gas concentrations (3 ppm ≤ cg ≤ 3500 ppm). The prediction errors are significantly smaller than those from correlations currently available in the literature.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleOn the Scaling of Pool Boiling Heat Flux With Gravity and Heater Size
    typeJournal Paper
    journal volume134
    journal issue1
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.4004370
    journal fristpage11502
    identifier eissn1528-8943
    keywordsBoiling
    keywordsPool boiling
    keywordsSubcooling
    keywordsHeat flux
    keywordsGravity (Force) AND Heat transfer
    treeJournal of Heat Transfer:;2012:;volume( 134 ):;issue: 001
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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