雷诺数
鳍
机械
管(容器)
材料科学
传热
摩擦系数
热力学
物理
湍流
复合材料
作者
Gregory J. Zdaniuk,Louay M. Chamra,Pedro J. Mago
标识
DOI:10.1016/j.expthermflusci.2007.09.006
摘要
Heat transfer coefficients and friction factors were determined experimentally for eight helically-finned tubes and one smooth tube using liquid water at Reynolds numbers ranging from 12,000 to 60,000. The helically-finned tubes tested in this investigation have helix angles between 25° and 48°, number of fin starts between 10 and 45, and fin height-to-diameter ratios between 0.0199 and 0.0327. An uncertainty analysis was completed and plain-tube results were compared to the Blasius and Dittus–Boelter equations with satisfactory agreement. Power-law correlations for Fanning friction and Colburn j-factors were developed using a least-squares regression. The performance of the correlations was evaluated with data of other researchers with average prediction errors between 30% and 40%.
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