过渡流状态下5列叉排圆柱列流动传热特性研究
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摘要
为了研究小型化换热器叉排管束群在过渡流状态下的传热强化机理,对5列叉排圆柱列的流动传热特性进行了数值分析。使用Fortran自编程序,通过基于复合网格的计算方法,研究了5列叉排圆柱列在不同横向间距(Ps/D)下的流动与传热特性。结果表明:当Ps/D=3时,5列叉排圆柱列的传热强化效果最好;Ps/D=4~6时,其传热强化效果降低。在不同横向间距下,第2列圆柱列的传热强化效果最为明显,后排圆柱列的传热强化效果逐渐降低。
In order to offer a detailed explanation of the flow and heat transfer mechanisms of tubes and fins used in miniaturization heat exchanger,five offset cylinder arrays models based on the compound grid system are simulated in this paper by Fortran program.By changing the horizontal spacing ratio transition(Ps/D)of the five offset cylinder arrays model,the results show that:(1)When Ps/D=3,the effect of the heat transfer is best,when Ps/D=4-6,the effect is weaker.(2)Among the different Ps/D,the second cylinder array has the best effect of the heat transfer,and the effect of the heat transfer of the later cylinder arrays decrease gradually.
In order to offer a detailed explanation of the flow and heat transfer mechanisms of tubes and fins used in miniaturization heat exchanger,five offset cylinder arrays models based on the compound grid system are simulated in this paper by Fortran program.By changing the horizontal spacing ratio transition(Ps/D)of the five offset cylinder arrays model,the results show that:(1)When Ps/D=3,the effect of the heat transfer is best,when Ps/D=4-6,the effect is weaker.(2)Among the different Ps/D,the second cylinder array has the best effect of the heat transfer,and the effect of the heat transfer of the later cylinder arrays decrease gradually.
引文
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[10]金如聪,贺小华.异型排列管束蒸发器壳程流场数值模拟[J].机械设计与制造.2010(9):193-195.JIN Rucong,HE Xiaohua.The numerical simulation on shell-side flow field of irregular arrangement tube bundle evaporator[J].Machinery Design &Manufacture,2010(9):193-195.(in Chinese)
[11]KIEDA S,SUZUKI K,SATO T.Numerical study on flow behavior and heat transfer in the vicinity of starting point of transpiratio[C]//Numerical methods in laminar and turbulent flow,Swansea:Pinneridge Press,1981:905-916.
[12]XI G N,TORIKOSHI K.An approach to the numerical analysis for flow and heat transfer performances of heat exchangers used in air conditioning machines[J].Proceeding of Computational Heat Transfer,1997(2):7-14.
[2] 焦凤,邓先和,孙大力,等.管束排列及管间距对换热器传热性能的影响[J].石油学报(石油加工),2013(5):836-843.JIAO Feng,DENG Xianhe,SUN Dali,et al.Effects of tube arrangements of longitudinal tube spacing on heat transfer performence of heat exchanger[J].Acta Petrolei Sinica(Petroleum Processing Section),2013,(5):836-843.(in Chinese)
[3] 戴伟,刘应征.横掠紧凑叉排管束流动的数值模拟与分析[J].制造业自动化,2011(2):107-110.DAI Wei,LIU Yingzheng.Numerical simulation of fluid flow across compact staggered tube array[J].Manufacturing Automation,2011(2):107-110.(in Chinese)
[4] PAUL S S,TACHIE M F,ORMISTON S J.Experimental study of turbulent cross-flow in a staggered tube bundle using particle image velocimetry[J].Heat and Fluid Flow,2007,28:441-453.
[5] ROTTMANN M,POPP K.Influence of upstream turbulence on the fuidelastic instability of a parallel triangular tube bundle[J].Fluid Structure,2003,18:595-612.
[6] LAM K,LIN Y F,ZOU L,et al.Experimental Study and large eddy simulation of turbulent flow around tube bundles composed of wavy and circular cylinders[J].Heat and Fluid Flow,2010,31:32-44.
[7] 周少东,时超,尤伟,等.过渡流下顺排双列圆柱流动、传热特性的数值研究[J].工程热物理学报,2014(8):1619-1623.ZHOU Shaodong,SHI Chao,YOU Wei,et al.Numerical study on characteristics of flow and heat transferof lnline double column cylinders in transition flow[J].Journal of Engineering Thermophysics,2014(8):1619-1623.(in Chinese)
[8] YAN S F,CAI C S,ZHOU S D,et al.Numerical study on characteristics of flow and thermal fields of offset cylinder arrays in the middle Reynolds number range[C]//Proceedings of 8th International Symposium on Heat Transfer.Berlin:Springer,2012.
[9] 尤伟.过渡流状态下三列交叉圆柱列的传热强化机理研究[D].南通:南通大学,2015.YOU Wei.Study on flow and heat transfer characteristics of three offset cylinder arrays in transition flow[D].Nantong:Nantong University,2015.(in Chinese)
[10]金如聪,贺小华.异型排列管束蒸发器壳程流场数值模拟[J].机械设计与制造.2010(9):193-195.JIN Rucong,HE Xiaohua.The numerical simulation on shell-side flow field of irregular arrangement tube bundle evaporator[J].Machinery Design &Manufacture,2010(9):193-195.(in Chinese)
[11]KIEDA S,SUZUKI K,SATO T.Numerical study on flow behavior and heat transfer in the vicinity of starting point of transpiratio[C]//Numerical methods in laminar and turbulent flow,Swansea:Pinneridge Press,1981:905-916.
[12]XI G N,TORIKOSHI K.An approach to the numerical analysis for flow and heat transfer performances of heat exchangers used in air conditioning machines[J].Proceeding of Computational Heat Transfer,1997(2):7-14.