Experimental investigation of heat transfer and pressure drop of turbulent flow inside tube with inserted helical coils

被引：0
|
作者：
M. A. Sharafeldeen
N. S. Berbish
M. A. Moawed
R. K. Ali
机构：
[1] Benha University,Department of Mechanical Engineering, Faculty of Engineering Shoubra
来源：
Heat and Mass Transfer | 2017年 / 53卷
关键词：
Reynolds Number; Nusselt Number; Friction Factor; Average Nusselt Number; Wire Diameter;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The heat transfer and pressure drop were experimentally investigated in a coiled wire inserted tube in turbulent flow regime in the range of Reynolds number of 14,400 ≤ Re ≤ 42,900. The present work aims to extend the experimental data available on wire coil inserts to cover wire diameter ratio of 0.044 ≤ e/d ≤ 0.133 and coil pitch ratio of 1 ≤ p/d ≤ 5. Uniform heat flux was applied to the external surface of the tube and air was selected as fluid. The effects of Reynolds number and wire diameter and coil pitch ratios on the Nusselt number and friction factor were studied. The enhancement efficiency and performance criteria ranges are of (46.9–82.6 %) and (100.1–128 %) within the investigated range of the different parameters, respectively. Correlations are obtained for the average Nusselt number and friction factor utilizing the present measurements within the investigated range of geometrical parameters and Re. The maximum deviation between correlated and experimental values for Nusselt number and friction factor are ±5 and ±6 %, respectively.
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页码：1265 / 1276
页数：11
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