本文对超临界压力CO2在垂直圆管(Din=2mm)内在高进口雷诺数和低进口雷诺数条件下的对流换热进行了实验研究,以研究变物性、浮升力和热加速对流动和换热的影响.实验结果发现,在低进口雷诺数情况下,向上流动中管子入口处出现了局部壁面温度下降,而在向下流动中未观察到此类现象;在高进口雷诺数情况下,向上流动中壁面温度发生了异常分布,这主要是因为向上流动中浮升力使得湍流发生了层流化现象,而在向下流动中未观察到此类现象.
参考文献
| [1] | Protopopov V S.One-Dimensional Flow of Single-Phase and Two-Phase Fluids in Tubes Under Heat Transfer Conditions[M].Moscow:Moscow Power Institute Press,1982 |
| [2] | Jackson J D;Cotton M A;Axcell B P .Studies of Mixed Convection in Vertical Tubes[J].International Journal of Heat and Fluid Flow,1989,10(01):2-15. |
| [3] | Jackson J D;Hall W B .Influences of Buoyancy on Heat Transfer to Fluids Flowing in Vertical Trbes under Turbulent Conditions[J].Advanced Study Institute Book:Turbulent Forced Convection in Channels and Rod BundlesTheory and Applications to Heat Exchangers and Reactors,1979,2:613-640. |
| [4] | McEligot D M;Coon C W;Perkins H C .Relaminarization in Tubes[J].International Journal of Heat and Mass Transfer,1970,13:431-433. |
| [5] | 张宇,姜培学,石润富,邓建强.竖直圆管中超临界压力CO2对流换热实验研究[J].工程热物理学报,2006(02):280-282. |
| [6] | Y Oka;K Yamada.Research and Development of High Temperature Light Water Cooled Reactor Operating at Supercritical-Pressure in Japan[A].Pittsburgh,PA USA,2004:470-479. |
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