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首页> 外文期刊>International Journal of Heat and Mass Transfer >Prediction of friction factors and heat transfer coefficients for turbulent flow in corrugated tubes combined with twisted tape inserts. Part 1: friction factors
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Prediction of friction factors and heat transfer coefficients for turbulent flow in corrugated tubes combined with twisted tape inserts. Part 1: friction factors

机译：波纹管中扭曲带插入物的湍流摩擦系数和传热系数的预测。第1部分：摩擦系数

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摘要

A simple mathematical model following the suggestion of Smithberg and Landis has been created to predict the friction factors for the case of a fully developed turbulent flow in a spirally corrugated tube combined with a twisted tape insert. The flow field is divided into two principal regions―a helicoidal core flow modified by secondary circulation effects and a twisting boundary layer flow. The "wall roughness" has an effect simultaneously on the axial velocity, secondary fluid motion and the resulting swirl mixing. The model reflects the influence of the "wall roughness" on the axial and tangential velocity components. The calculated friction factors have been compared with 570 experimental points obtained from 57 tubes tested. Five hundred points (87.7%) have a relative difference of less than +-15%; fifty one points (8.9%) have a difference of within +-(15-20)% and only nineteen points (3.4%) have a relative difference greater than +-20%.
机译：根据Smithberg和Landis的建议，已经创建了一个简单的数学模型，以预测在螺旋波纹管与扭曲的带状插入物组合的情况下，充分发展的湍流情况下的摩擦系数。流场分为两个主要区域：通过二次循环效应修改的螺旋芯流和扭曲边界层流。 “壁粗糙度”同时对轴向速度，二次流体运动以及由此产生的旋流混合产生影响。该模型反映了“壁面粗糙度”对轴向和切向速度分量的影响。已将计算出的摩擦系数与从57个测试管获得的570个实验点进行了比较。五百点（87.7％）的相对差异小于+ -15％； 51个点（8.9％）的差异在+-（15-20）％内，而只有19个点（3.4％）的相对差异大于+ -20％。

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