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Augmentation of laminar flow and heat transfer in flat tubes by means of helical screw-tape inserts

机译：借助螺旋螺带嵌件增强扁管中的层流和传热

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The heat transfer a characteristics and friction factor in the horizontal double pipes of flat tubes with full length helical screw element of different twist ratio and helical screw inserts with different spacer length are investigated. Cold and hot water are used as working fluid in tube side and shell side respectively. The experiments covered a range of Reynolds numbers 5.7 × 10~2 ≤ Re ≤ 1.31 × 10~3. The effect of spacer length on the heat transfer augmentation and friction factor and the effect of twist ratio on heat transfer augmentation and friction factor have been presented separately. The study shows that, the Nusslet number (Nu) and friction factor (f) decrease with the increase of S or Y for flat tube. The comparison between the data of present plain circular with that of previous plain circular tube showed a good agreement between them but the data of present plain flat tube showed a higher in heat transfer and pressure drop than that of plain circular tube. The correlations of average Nus-selt number and friction factor with Re, S and Y are presented.
机译：研究了具有不同扭曲比的全长螺旋螺杆元件和具有不同垫片长度的螺旋螺杆嵌件的水平管的水平双管的传热特性和摩擦系数。冷水和热水分别用作管侧和壳侧的工作流体。实验覆盖了雷诺数5.7×10〜2≤Re≤1.31×10〜3的范围。分别介绍了垫片长度对传热和摩擦系数的影响以及扭曲比对传热和摩擦系数的影响。研究表明，扁管的Nusslet数（Nu）和摩擦系数（f）随S或Y的增加而减小。目前的普通圆管的数据与以前的普通圆管的数据之间的比较表明它们之间有很好的一致性，但是目前的普通圆管的数据显示出比普通圆管更高的传热和压降。给出了平均Nus-selt数和摩擦系数与Re，S和Y的关系。

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