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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/10555

    Authors: 黃景良
    Date: 2009
    Issue Date: 2010-06-10 12:09:58 (UTC+8)
    Abstract: This study is to investigate the characteristics of critical and neutral thicknesses of an insulated oval
    duct by using computer aided two-dimensional numerical analysis and one-dimensional PWTR model
    based on accurate oval duct surfaces. While the outer radius of non-insulated situation of an insulated
    circular duct is less than its critical insulated radius, the critical heat transfer will occur. The heat transfer
    rate increases along with the increasing insulated thickness until reaches it maximum value at critical
    insulated thickness; then it decreases until reached the point of neutral thickness whose heat transfer rate
    is the same as that of non-insulated duct. Thus, there is no insulated effect before neutral insulated
    thickness. These characteristics are very significant for small size insulated duct, especially in situations
    of low ambient air/gas convective coefficients. It shows in this study that the critical phenomena of an
    insulated oval duct is very similar to those of an insulated circular duct, except it’s critical and neutral
    thicknesses are smaller for bigger oval axes ratio.
    Appears in Collections:[機械工程系所] 會議論文

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