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首页> 外文期刊>Journal of Heat Transfer >Drag and Heat Transfer Reduction Phenomena of Drag-Reducing Surfactant Solutions in Straight and Helical Pipes
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Drag and Heat Transfer Reduction Phenomena of Drag-Reducing Surfactant Solutions in Straight and Helical Pipes

机译：直管和螺旋管中减阻表面活性剂溶液的减阻传热减少现象

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Flow drag and heat transfer reduction phenomena of non-ionic aqueous surfactant solutions flowing in helical and straight pipes have been experimentally investigated at surfactant solution concentration range of 250-5000 ppm and temperature range of 5-20℃. The helically coiled pipes have curvature ratios range of 0.018-0.045. Experimental findings indicate that the friction factors and the heat transfer coefficients of the surfactant solution in helical pipes are significantly higher than in a straight pipe and lower than Newtonian fluid flow like water through the same coils in the turbulent drag reduction region. Drag reduction and heat transfer reduction increase with an increase in surfactant solution concentration and temperature in the measured concentration and temperature ranges. On the other hand, they decrease with increasing of the curvature ratio. A set of empirical expressions for predicting the friction factor and the average Nusselt number for the surfactant solution's flow through helical and straight pipes have been regressed based on the obtained data in the present experiments.
机译：实验研究了非离子型表面活性剂水溶液在螺旋管和直管中流动时的流动阻力和传热减少现象，表面活性剂溶液的浓度范围为250-5000 ppm，温度范围为5-20℃。螺旋盘管的曲率比范围为0.018-0.045。实验结果表明，螺旋管中表面活性剂溶液的摩擦因数和传热系数显着高于直管，而低于牛顿流体像水一样通过湍流减阻区中的相同盘管。在测量的浓度和温度范围内，随着表面活性剂溶液浓度和温度的增加，减阻和传热减少也随之增加。另一方面，它们随着曲率比的增加而减小。根据本实验中获得的数据，已经回归了一组经验公式，用于预测表面活性剂溶液流经螺旋管和直管的摩擦因数和平均努塞尔数。

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