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《Journal of Shanghai Jiaotong University》 2017-01
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A Numerical Study of Turbulent Flow and Heat Transfer of Dimples at Different Depths

YANG Yun;RAO Yu;School of Mechanical Engineering,Shanghai Jiao Tong University;  
Based on numerical simulations,the friction factors and heat transfer coefficients of four dimples with different depths were obtained by using the standard k ωturbulence model,and the relations for the heat transfer and friction factors were also presented when the Reynolds number(Re)varies from 8 500to60 000.The results showed that the average heat transfer coefficient and the friction factor gradually increase with the increasing of the depth.They also increase as the Reynolds number increases.In the case of Re=8 500andσ=0.1or 0.3(σ:the ratio of depth to face diameter),the average heat transfer coefficient and the friction factor are almost invariant,the average heat transfer coefficient increases 40%to flat plate channel.Compared with the depth ofσ=0.1,a dimple depth ofσ=0.3achieves a heat transfer enhancement of more than 11% at the Reynolds number of 50 500.Compared to the flat plate channel,the average heat transfer performances of the dimpled channels increase by about 42.1% and 51.6%,friction factors increase 30% and 120%,respectively;and also the overall heat transfer coefficients increase by10%to 35%;the heat transfer coefficient decreases as the increase of the depth.The distribution of localNusselt number in the flow direction of shallow dimpled channel at a dimple depth ofσ=0.1andσ=0.2is symmetric.However,it becomes asymmetric in deep dimpled channel at a dimple depth ofσ=0.26andσ=0.3.The reason may be the different vortex structures in shallow dimples and deep dimples.
【Fund】: 国家自然科学基金资助项目(51676119;51176111)
【CateGory Index】: TK124
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【Citations】
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1 FENG Yan;RAO Yu;LI Bo;Institute of Turbomachinery,School of Mechanical Engineering,Shanghai Jiaotong University;;Influence of Dimple Shapes on Turbulent Flow and Heat Transfer[J];上海交通大学学报;2015-05
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【Co-citations】
Chinese Journal Full-text Database 9 Hits
1 LI Wencan;RAO Yu;LI Bo;QIN Jiang;Institute of Turbomachinery,School of Mechanical Engineering,Shanghai Jiaotong University;School of Energy Science and Engineering,Harbin Institute of Technology;;Experimental of turbulent flow heat transfer of dimple vortex generators with rounded edge[J];航空学报;2017-09
2 YANG Yun;RAO Yu;School of Mechanical Engineering,Shanghai Jiao Tong University;;A Numerical Study of Turbulent Flow and Heat Transfer of Dimples at Different Depths[J];上海交通大学学报;2017-01
3 LI Bo;RAO Yu;CHEN Peng;Institute of Turbomachinery,School of Mechanical Engineering Shanghai Jiao Tong University;;An Experimental Study of Local Heat Transfer of Dimple Vortex Generator Using Transient Liquid Crystal Thermography[J];工程热物理学报;2015-11
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