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    Experimental Studies on Heat Transfer Coefficients of Horizontal Tube Falling Film Evaporation With Seawater

    Source: Journal of Heat Transfer:;2017:;volume( 139 ):;issue: 001::page 11504
    Author:
    Shen, Shengqiang
    ,
    Chen, Xue
    ,
    Mu, Xingsen
    ,
    Jiang, Changkun
    DOI: 10.1115/1.4034682
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The overall heat transfer process in a horizontal tube falling film evaporator is mainly influenced by the falling film evaporation outside horizontal tube due to the average heat transfer coefficient which is about 50% of that of the condensation inside tube. A series of experimental studies were conducted to investigate the heat transfer coefficients of the falling film evaporation outside the horizontal tube with parameters such as the spray density, the evaporation temperature, the salinity, and the tube spacing. Experiments were conducted by using Al-brass tubes with 19 mm outer diameter and 1600 mm length. The horizontal tubes are arranged vertically in the evaporator. The test tube is heated by an internal electric heater with uniform heat flux. Temperatures of the test tube surface and saturated vapor measured by thermocouples are used to calculate the heat transfer coefficients. The seawater with salinity of 1.5%, 3.0%, and 4.5% was used as experimental fluid. The spray density varied between 0.017 and 0.087 kg/(m s), and the evaporation temperature was controlled in the range of 50–70 °C. Results show that the average heat transfer coefficients of water under different salinities increase obviously with the spray density until a certain point. The average heat transfer coefficients of seawater decrease slightly with the evaporation temperature, decrease with the salinity, increase with the tube spacing, and are almost independent of the heat flux. In addition, the comparisons with 25.4 mm outer diameter tube and the circumferential distribution of local heat transfer coefficient are presented in this study.
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      Experimental Studies on Heat Transfer Coefficients of Horizontal Tube Falling Film Evaporation With Seawater

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4234125
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    contributor authorShen, Shengqiang
    contributor authorChen, Xue
    contributor authorMu, Xingsen
    contributor authorJiang, Changkun
    date accessioned2017-11-25T07:16:40Z
    date available2017-11-25T07:16:40Z
    date copyright2016/27/9
    date issued2017
    identifier issn0022-1481
    identifier otherht_139_01_011504.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4234125
    description abstractThe overall heat transfer process in a horizontal tube falling film evaporator is mainly influenced by the falling film evaporation outside horizontal tube due to the average heat transfer coefficient which is about 50% of that of the condensation inside tube. A series of experimental studies were conducted to investigate the heat transfer coefficients of the falling film evaporation outside the horizontal tube with parameters such as the spray density, the evaporation temperature, the salinity, and the tube spacing. Experiments were conducted by using Al-brass tubes with 19 mm outer diameter and 1600 mm length. The horizontal tubes are arranged vertically in the evaporator. The test tube is heated by an internal electric heater with uniform heat flux. Temperatures of the test tube surface and saturated vapor measured by thermocouples are used to calculate the heat transfer coefficients. The seawater with salinity of 1.5%, 3.0%, and 4.5% was used as experimental fluid. The spray density varied between 0.017 and 0.087 kg/(m s), and the evaporation temperature was controlled in the range of 50–70 °C. Results show that the average heat transfer coefficients of water under different salinities increase obviously with the spray density until a certain point. The average heat transfer coefficients of seawater decrease slightly with the evaporation temperature, decrease with the salinity, increase with the tube spacing, and are almost independent of the heat flux. In addition, the comparisons with 25.4 mm outer diameter tube and the circumferential distribution of local heat transfer coefficient are presented in this study.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleExperimental Studies on Heat Transfer Coefficients of Horizontal Tube Falling Film Evaporation With Seawater
    typeJournal Paper
    journal volume139
    journal issue1
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.4034682
    journal fristpage11504
    journal lastpage011504-6
    treeJournal of Heat Transfer:;2017:;volume( 139 ):;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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