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نویسندگان مقالات پربازدید :
مجله بین المللی علوم حرارتی
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • a numerical study on heat transfer and friction factor characteristics of laminar flow in a circular tube fitted with center-cleared twisted tape

    نویسندگان :
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    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 679
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     twisted tape is a widely used technique for heat transfer enhancement. in the present paper, we proposed a center-cleared twisted tape aiming at acxhieving good thermohydraulic performance. a comparative study between this type and the short-width twisted tape was performed numerically in laminar tubular flows. the computation results demonstrated that the flow resistance can be reduced by both methods; however, the thermal behaviors are very different from each other. for tubes with short-width twisted tapes, the heat transfer and thermohydraulic performance are weakened by cutting off the tape edge. contrarily, for tubes with center-cleared twisted tapes, the heat transfer can be even enhanced in the cases with a suitable central clearance ratio. the thermal performance factor of the tube with center-cleared twisted tape can be enhanced by 7–20% as compared with the tube with conventional twisted tape. all these demonstrated that the center-cleared twisted tape is a promising technique for laminar convective heat transfer enhancement.

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