本文对超临界压力CO2在微细蛇形管内层流对流换热开展了数值模拟研究.研究的蛇形管内径0.5 mm,弯曲半径2 mm,入口雷诺数200～500,压力9 MPa.分析了变物性、浮升力和离心力的影响,对特征截面温度与速度分布进行了详细分析.结果表明:向上流动时,截面温度和速度呈对称分布,水平流动时,对称性消失;截面上两对涡的分布在向上和水平流动时呈现不同特性,换热强化和减弱区域不同.
参考文献
| [1] | 李满昌,王明利.超临界水冷堆开发现状与前景展望[J].核动力工程,2006(02):1-4,44. |
| [2] | Karsten Pruess .Enhanced geothermal systems (EGS) using CO_2 as working fluid—A novel approach for generating renewable energy with simultaneous sequestration of carbon[J].Geothermics,2006(4):351-367. |
| [3] | Vashisth S;Kumar V;Nigam KDP .A review on the potential applications of curved geometries in process industry[J].Industrial & Engineering Chemistry Research,2008(10):3291-3337. |
| [4] | Adam A. Donaldson;Deepak M. Kirpalani;Arturo Macchi .Single and two-phase pressure drop in serpentine mini-channels[J].Chemical Engineering and Processing,2011(8):877-884. |
| [5] | Y. Sui;C. J. Teo;P. S. Lee;Y. T. Chew;C. Shu .Fluid flow and heat transfer in wavy microchannels[J].International Journal of Heat and Mass Transfer,2010(13/14):2760-2772. |
| [6] | S. He;W. S. Kim;P. X. Jiang;J. D. Jackson .Simulation of mixed convection heat transfer to carbon dioxide at supercritical pressure[J].Proceedings of the Institution of Mechanical Engineers, Part C. Journal of mechanical engineering science,2004(c11):1281-1296. |
| [7] | X. L. Cao;Z. H. Rao;S. M. Liao .Laminar convective heat transfer of supercritical CO_2 in horizontal miniature circular and triangular tubes[J].Applied thermal engineering: Design, processes, equipment, economics,2011(14/15):2374-2384. |
| [8] | L.J.LI;C.X.LIN;M.A.EBADIAN .TURBULENT HEAT TRANSFER TO NEAR-CRITICAL WATER IN A HEATED CURVED PIPE UNDER THE CONDITIONS OF MIXED CONVECTION[J].International Journal of Heat and Mass Transfer,1999(16):3147-3158. |
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