Heat transfer and friction characteristics for artificially roughened ducts with compound turbulators

被引：100
|
作者：
Layek, Apurba [1 ]
Saini, J. S.
Solanki, S. C.
机构：
[1] NIT Durgapur, Dept Mech Engn, Durgapur 713209, India
[2] Indian Inst Technol Roorkee, Dept Mech & Ind Engn, Roorkee 247667, Uttar Pradesh, India
来源：
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2007年 / 50卷 / 23-24期
关键词：
compound-roughness; heat transfer coefficient; friction factor; chamfer angle and groove position;
D O I：
10.1016/j.ijheatmasstransfer.2007.02.042
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
An experimental investigation on heat and fluid flow characteristics of fully developed turbulent flow in a rectangular duct having repeated integral transverse chamfered rib-groove roughness on one broad wall has been carried out. Experiments encompassed the Reynolds number range of 3000-21,000; relative roughness pitch of 4.5-10, chamfer angle of 5 degrees-30 degrees, relative groove position of 0.3-0.6 and relative roughness height of 0.022-0.04. The effect of roughness parameters on Nusselt number and friction factor have been discussed and the results are compared with the results of square rib-grooved and smooth duct under similar flow conditions. The conditions for the best performance have been determined. Correlations for the Nusselt number and friction factor have been developed as a function of roughness parameters and flow Reynolds number. (c) 2007 Elsevier Ltd. All rights reserved.
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页码：4845 / 4854
页数：10
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