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《Chemical Engineering & Machinery》 2011-01
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Study on Influence of Structure Parameters on Heat Transfer and Flow Resistance of Spiral-grooved Tube

LI Jun1,SANG Zhifu1,WANG Chen1,SHI Hongbing2(1Nanjing University of Technology,Nanjing 210009,Jiangsu,China;2Anhui Special Equipment Inspection Institute,Hefei 230051,Anhui,China)  
Based on the computational fluid dynamics,the impact of Reynolds number and the geometry size of the tubes on heat transfer and flow resistance of the spiral-grooved tube were investigated.The simulation results show that the secondary vortex flow can appear around the protrude structure,the rotational flow created by grooved channel can disturb boundary layer,this can improve heat transfer and increase the flow resistance.The same Reynolds numbers can give deeper grooves a better heat-exchange performance and increased flow resistance,but the greater fin pitch and trough radius can decrease heat exchange effect and flow resistance.Compared with the smooth tubes,the maximum Nu of spiral-grooved tube is 2.21 times that of the smooth tube,and the maxi.η of spiral-grooved tube can reach 1.27.
【CateGory Index】: TK124
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