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Enhanced heat transfer in rectangular duct with punched winglets

Chinese Journal of Chemical Engineering 2020年第3期28卷 660-671页

作者： Pongjet Promvonge sompol skullong Department of Mechanical Engineering Faculty of EngineeringKing Mongkut's Institute of Technology LadkrabangBangkok 10520Thailand Energy Systems Research Group Department of Mechanical EngineeringFaculty of Engineering at SrirachaKasetsart University Sriracha Campus199 M.6.Sukhumvit Rd..SrirachaChonburi 20230Thailand

Thermal performance of a heat exchanger duct with punched winglets(PWs)mounted on the upper duct wall has been examined for Reynolds number(Re)ranging from 4100 to 25,500.In the present experiment,two types of PWs:punched delta-and elliptical-winglets(P-DW and P-EW)with four punched-hole sizes were tested at a fixed attack angle,optimal relative pitch and height.Also,data of solid delta-and elliptical-winglets(DW and EW)were included for comparison.The investigation has shown that the P-DW yields higher thermal-performance enhancement factor(η)than the P-EW.Although the solid DW and EW with no punch have the highest heat transfer and friction loss,the PWs yield betterηthan the solid ones.For PWs,the P-DW with smaller hole size has the peak heat transfer and friction loss around 5.7 and 40 times over the smooth duct,respectively but the optimumηof 2.17 is seen for the one with a certain hole size.The PWs provideηat about 5%–8%above the solid winglets.

关键词： Heat exchanger Winglet Flow resistance Thermal-performance enhancement factor Vortex generator

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太阳能空气加热器管道中填充三角形小翅片扰流器的湍流传热的实验研究(英文)

引用

Chinese Journal of Chemical Engineering 2014年第1期22卷 1-10页

作者： sompol skullong Pongjet Promvonge Department of Mechanical Engineering Faculty of Engineering at Si Racha Kasetsart University Si Racha Campus Department of Mechanical Engineering Faculty of Engineering King Mongkut’s Institute of Technology Ladkrabang

The paper presents an experimental study on the heat transfer and flow friction characteristics in a solar air heater channel fitted with delta-winglet type vortex generators(DWs).The experiments are conducted by varying the airflow rate for Reynolds number in the range of 5000 to 24000 in the test section with a uniform heat-flux applied on the upper channel wall.Firstly,the DW pairs are mounted only at the entrance of the lower wall of the test channel(called DW-E)to create multiple vortex flows at the entry.The effect of two transverse pitches(RP Pt/H 1 and 2)at three attack angles(α30°,45°and 60°)of the DW-E with its relative height,b/H 0.5(half height of channel)is examined.Secondly,the 30°DWs with three different relative heights(b/H 0.3,0.4 and0.5)are placed on the upper wall only(absorber plate,called DW-A)of the test channel.The experimental result reveals that in the first case,the 60°DW-E at RP1 provides the highest heat transfer and friction factor while the30°DW-E at RP1 performs overall better than the others.In the second case,the 30°DW-A at b/H 0.5 yields the highest heat transfer and friction factor but the best thermal performance is found at b/H 0.4.

关键词：涡流发生器空气加热器太阳能通道实验翼梢小翼湍流对流相对高度

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