超临界CO_(2)在水平螺旋槽管内冷却换热的数值研究  

Numerical Investigation on Cooling and Heat Transfer of Supercritical CO_(2) in Horizontal Spiral Groove Tubes

作　　者：李猛 陶乐仁[1] 虞中旸 俞庆 LI Meng;TAO Le-ren;YU Zhong-yang;YU Qing(School of Energy and Power Engineering,Shanghai University of Technology,Shanghai,China,Post Code:200093)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《热能动力工程》2021年第4期51-59,共9页Journal of Engineering for Thermal Energy and Power

基　　金：上海市动力工程多相流动与传热重点实验室基金项目(1N-15-301-101)。

摘　　要：建立了螺旋槽管的三维实体模型,使用ANSYS Fluent软件模拟了在不同的冷却压力、质量流量以及进口温度下超临界CO_(2)在水平螺旋槽管内的流动与传热特性。结果表明:流体的整体换热系数随冷却压力的增大而降低,随进口温度变化不显著;随着质量流量的增加,浮力效应所产生的影响降低,局部换热系数的峰值增大。在考虑了流体性质的基础上,建立了槽管冷却过程中超临界CO_(2)对流换热系数关联式,并与文献实验值进行了对比,验证了关联式的准确性。A three-dimensional solid model of the spiral groove tube was established, and the flow and heat transfer characteristics of supercritical CO_(2) in horizontal spiral groove tube under different cooling pressures, mass flow rates and inlet temperatures were simulated using Fluent 19.0.The results indicated that the overall heat transfer coefficient of the fluid decreased with the increase of the cooling pressure, but did not change much with the increase of the inlet temperature.With the increase of mass flow rate, the buoyancy effect decreased and the peak value of local heat transfer coefficient increased.Considering the properties of the fluid, a correlation equation of the supercritical CO_(2) convective heat transfer during the cooling process in spiral groove tube was derived, and was compared with the literature experimental data, verifying the accuracy of the correlation.

关 键 词：超临界流体 二氧化碳 螺旋槽管 冷却换热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]