管排数对球突翅片管式换热器传热特性的影响
The effect of tube row number on heat transfer characteristics of the dimpled fin tube heat exchanger
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摘要: 通过数值对比研究了不同管排数对球突翅片管式换热器的换热和流动特性的影响.结果表明:随着管排数的增加,热量/压降(Q/Δp)和COP值逐渐减少,2排管的QΔP和COP值最大.在Re=1 138~3415范围内,2排管平均Nu数分别比3,4,5排管增大11.1%,21.7%,23.2%.流场图显示,不同管排数均因球突增强了扰动,而强化了换热,但4,5排管的温度场几乎无变化,说明管排数的增加并不能增强换热.综上2排管换热综合性能较好.Abstract: The effect of different tube row number on heat transfer and pressure drop characteristics of dimpled fin tube heat exchanger was investigated.The results showed that:the ratio of heat transfer rate and pressuer drop(Q/ΔP) and COP decreased with the increase of tube row number, Q/ΔP and COP of two-row tube was the biggest.Compared with the three, four, five-row tube, average Nu number of two-row tube increased by 11.1%, 21.7%, 23.2% at Re=1 138~3 415, respectively.The flow filed indicated that the arrangement of the dimple could intensify flow turbulence,which enhanced the heat transfer,but when the number of tube rows are 4 and 5, the temperature field changed little,which indicated that the heat transfer didn't change significantly when the number of tube rows increased.So the comprehensive performance of two row tube rows was better.
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Key words:
- dimpled fin tube heat exchanger /
- tube row number /
- enhanced heat transfer
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[1]
Ligrani P,Mahmood G,Harrison J,et al.Flow structure and local nusselt number variations in a channel with dimples and protrusions on opposite walls[J].International Journal of Heat and Mass Transfer,2001,44(23):4413.
-
[2]
Won S Y,Zhang Q,Ligrani P M.Comparisons of flow structure above dimpled surfaces with different dimple depths in a channel[J].Physics of fluids,2005,17:45.
-
[3]
Chang S,Chiang K,Yang T,et al.Heat transfer and pressure drop in dimpled fin channels[J].Experimental Thermal and Fluid Science,2008,33(1):23.
-
[4]
Hwang S D,Kwon H G,Cho H H.Heat transfer with dimple/protrusion arrays in a rectangular duct with a low reynolds number range[J].International Journal of Heat and Fluid Flow,2008,29(4):916.
-
[5]
Hwang S D,Kwon H G,Cho H H.Local heat transfer and thermal performance on periodically dimple-protrusion patterned walls for compact heat exchangers[J].Energy,2010,35(12):5357.
-
[6]
Isaev S,Kornev N,Leontiev A,et al.Influence of the reynolds number and the spherical dimple depth on turbulent heat transfer and hydraulic loss in a narrow channel[J].International Journal of Heat and Mass Transfer,2010,53(1):178.
-
[7]
Chang S,Liou T M,Lee T H.Thermal performance comparison between radially rotating ribbed parallelogram channels with and without dimples[J].International Journal of Heat and Mass Transfer,2012,55(13):3541.
-
[8]
Mahmood G,Ligrani P.Heat transfer in a dimpled channel:combined influences of aspect ratio,temperature ratio,reynolds number,and flow structure[J].International Journal of Heat and Mass Transfer,2002,45(10):2011.
-
[9]
樊菊芳,何雅铃,陶文铨.球突翅片表面的数值模拟和特性分析[J].工程热物理学报,2008,29(11):1921.
-
[10]
Fan Q,Yin X.3-D numerical study on the effect of geometrical parameters on thermal behavior of dimple jacket in thin-film evaporator[J].Applied Thermal Engineering,2008,28(14):1875.
-
[11]
Elyyan M A,Tafti D K.A novel split-dimple interrupted fin configuration for heat transfer augmentation[J].International Journal of Heat and Mass Transfer,2009,52(5):1561.
-
[12]
宋伟明,孟继安,李志信.空冷器球突翅片换热与不可逆性分析[J].清华大学学报:自然科学版,2010(7):1104.
-
[13]
吴学红,崔帅,苟秋平,等.球突翅片的传热流动特性及等效热阻数值分析[J].工业加热,2012,41(1):43.
-
[14]
-
[15]
吴学红,苟秋平,吕彦力,等.半球突开缝翅片传热特性模拟及(火积)分析[J].工程热物理学报,2013,34(1):153.
-
[16]
苟秋平,吴学红,吕彦力,等.复合翅片传热与流动特性的数值模拟[J].热科学与技术,2011,10(4):317.
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