Y型小通道多相流换热特性分析
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摘要
采用计算流体动力学模拟仿真软件CFX对Y型小通道内部流场流动换热特性进行研究分析。模型采用仿生Y型通道结构,分形角度的范围为30°～150°,通道直径为1mm。对分型角为60°的小通道进行了实验研究和数值分析对比,对比结果显示两者吻合良好。研究分析了不同分形角度对分型通道内的单相对流换热系数和两相沸腾换热系数的影响。不同分形角度对多相流场内部阻力系数的影响以及不同雷诺数下Y型小通道平均含气率的变化规律。研究结果表明:增大分形角度会使Y型通道内部流体对流换热系数和阻力系数增大,气体平均体积分数随着雷诺数的增大而减小。
The flow and heat transfer characteristics of the internal flow field in the Y-shaped small channel are studied and analyzed using computational fluid dynamic simulation software CFX. The effects of different types of micro-scale channels on their internal single-stream heat transfer coefficients and boiling heat transfer coefficients are discussed, and the effects of different types of angles on the internal drag coefficient of multi-phase flow fields and the different Reynolds number type Y are discussed. The change of average gas rate in the small channel. The results show that increasing the angle of subdivision will increase the convection heat transfer coefficient and drag coefficient of the Y-shaped channel. Under the condition of boiling heat transfer, the latent heat of phase change will affect the boiling heat transfer coefficient to a certain extent. The Reynolds number has a linear relationship with the average volume fraction of gas inside the flow field, which indicates that the convective boiling heat transfer has always played a leading role in boiling heat transfer in the flow field.
The flow and heat transfer characteristics of the internal flow field in the Y-shaped small channel are studied and analyzed using computational fluid dynamic simulation software CFX. The effects of different types of micro-scale channels on their internal single-stream heat transfer coefficients and boiling heat transfer coefficients are discussed, and the effects of different types of angles on the internal drag coefficient of multi-phase flow fields and the different Reynolds number type Y are discussed. The change of average gas rate in the small channel. The results show that increasing the angle of subdivision will increase the convection heat transfer coefficient and drag coefficient of the Y-shaped channel. Under the condition of boiling heat transfer, the latent heat of phase change will affect the boiling heat transfer coefficient to a certain extent. The Reynolds number has a linear relationship with the average volume fraction of gas inside the flow field, which indicates that the convective boiling heat transfer has always played a leading role in boiling heat transfer in the flow field.
引文
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[3]徐国强,王梦,吴宏,等. Y形构形小通道流动换热特性的数值分析[J].北京航空航天大学学报, 2009, 35(3):313-317.
[4]杨世铭,陶文铨.传热学(第三版)[M].北京:高等教育出版社,1998.
[5]费祥麟.高等流体力学[M].西安:西安交通大学, 1989.
[6] Cooper M G. Saturation Nucleate Pool Bolling-a Simple Correlation[C]//1984:785-793.
[7] Gorenflo D, Chandra U, Kotthoff S, et al. Influence of thermophysical properties on pool boiling heat transfer of refrigerants[J].International Journal of Refrigeration, 2004, 27(5):492-502.