Effects of a Kind of Surface Groove on Flow Loss in Both Rectangular and Circular Ducts at Different Reynolds Numbers

Pipes are widely used to transport gas,oil and water in industries.Drag reduction in pipes is an increasingly concerned problem to save energy.Some researches have indicated that the non-smooth surface with special structures can reduce flow loss.In this paper,an experimental investigation has been...

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Bibliographic Details
Published in:Journal of thermal science 2016-10, Vol.25 (5), p.389-393
Main Authors: Ma, Rong, Ma, Hongwei, Zhang, Zhenyang, Zhang, Jinghui
Format: Article
Language:English
Subjects:
Classical and Continuum Physics
Engineering Fluid Dynamics
Engineering Thermodynamics
Heat and Mass Transfer
Physics
Physics and Astronomy
Reynolds number
压力损失系数
流动损失
矩形管
管内
管道阻力
表面沟槽
表面测量
雷诺兹数
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Summary:Pipes are widely used to transport gas,oil and water in industries.Drag reduction in pipes is an increasingly concerned problem to save energy.Some researches have indicated that the non-smooth surface with special structures can reduce flow loss.In this paper,an experimental investigation has been performed on the effects of a kind of surface groove on the drag in both rectangular and circular duct at different Reynolds numbers.In the experiment of the rectangular duct,total pressure at both inlet and outlet were measured.Static pressure on the wall was measured on the surface with smooth and grooved film respectively.In the circular duct,a boundary layer pressure probe was used to measure the total pressure distribution at both inlet and outlet.Four taps at inlet and outlet were used to measure static pressure.The loss coefficient is used to evaluate the effects of the surface groove on drag reduction.The experiment was conducted with the Reynolds number range from 1.28×10~4 to 2.57×10~4.The result shows a maximum drag loss reduction of approximately 2.4% in rectangular duct at Reynolds number of 2.4×10~4.A 10%reduction of pipe pressure loss by grooved surface is measured in circular duct at a Reynolds number of 3.0×10~5.
ISSN:1003-2169
1993-033X
DOI:10.1007/s11630-016-0875-6