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    Experimental Investigation of the Air Flow Behavior and Heat Transfer Characteristics in Microchannels With Different Channel Lengths

    Source: Journal of Heat Transfer:;2017:;volume( 139 ):;issue: 005::page 52403
    Author:
    Tao, Zhi
    ,
    Zhu, Zhibing
    ,
    Li, Haiwang
    DOI: 10.1115/1.4035589
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: This paper attempts to experimentally investigate the influence of channel length on the flow behavior and heat transfer characteristics in circular microchannels. The diameters of the channels were 0.4 mm and the length of them were 5 mm, 10 mm, 15 mm, and 20 mm, respectively. All experiments were performed with air and completed with Reynolds number in the range of 300–2700. Results of the experiments show that the length of microchannels has remarkable effects on the performance of flow behavior and heat transfer characteristics. Both the friction factor and Poiseuille number drop with the increase of channel length, and the experimental values are higher than the theoretical ones. Moreover, the channel length does not influence the value of critical Reynolds number. Nusselt number decrease as the increase of channel length. Larger Nusselt numbers are obtained in shorter channels. The results also indicate that in all cases, the friction factor decreases and the Poiseuille number increases with the increase of the Reynolds number. It is also observed that the value of critical Reynolds number is between 1500 and 1700 in this paper, which is lower than the value of theoretical critical Reynolds number of 2300.
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      Experimental Investigation of the Air Flow Behavior and Heat Transfer Characteristics in Microchannels With Different Channel Lengths

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    contributor authorTao, Zhi
    contributor authorZhu, Zhibing
    contributor authorLi, Haiwang
    date accessioned2017-11-25T07:16:50Z
    date available2017-11-25T07:16:50Z
    date copyright2017/14/2
    date issued2017
    identifier issn0022-1481
    identifier otherht_139_05_052403.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4234232
    description abstractThis paper attempts to experimentally investigate the influence of channel length on the flow behavior and heat transfer characteristics in circular microchannels. The diameters of the channels were 0.4 mm and the length of them were 5 mm, 10 mm, 15 mm, and 20 mm, respectively. All experiments were performed with air and completed with Reynolds number in the range of 300–2700. Results of the experiments show that the length of microchannels has remarkable effects on the performance of flow behavior and heat transfer characteristics. Both the friction factor and Poiseuille number drop with the increase of channel length, and the experimental values are higher than the theoretical ones. Moreover, the channel length does not influence the value of critical Reynolds number. Nusselt number decrease as the increase of channel length. Larger Nusselt numbers are obtained in shorter channels. The results also indicate that in all cases, the friction factor decreases and the Poiseuille number increases with the increase of the Reynolds number. It is also observed that the value of critical Reynolds number is between 1500 and 1700 in this paper, which is lower than the value of theoretical critical Reynolds number of 2300.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleExperimental Investigation of the Air Flow Behavior and Heat Transfer Characteristics in Microchannels With Different Channel Lengths
    typeJournal Paper
    journal volume139
    journal issue5
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.4035589
    journal fristpage52403
    journal lastpage052403-7
    treeJournal of Heat Transfer:;2017:;volume( 139 ):;issue: 005
    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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