垂直上升矩形流道内气液两相流流型图的数值模拟  

Numerical simulation of flow pattern map of upward two-phase flow in vertical rectangular channel

作　　者：赵艳明[1] 潘良明[1] 张文志[1] 

机构地区：[1]重庆大学动力工程学院核能工程系,重庆400044

出　　处：《核科学与工程》2012年第3期254-259,共6页Nuclear Science and Engineering

基　　金：中央高校基本科研业务费资助重点项目(CDJZR10145501)

摘　　要：两相流流型在分析换热、流动不稳定性以及临界热流密度方面具有基础性作用。本文基于VOF(Volume of Fluid)多相流模型,对垂直上升矩形流道内气液两相流动进行数值模拟,表观气速0.1～110m/s,表观液速0.1～3.2m/s。得到了流道内气液两相流的主要流型:泡状流、弹状流、搅混流和环状流,分析了流道内截面含气率分布与流型的对应关系,以及截面含气率与气液两相流容积含气率的关系;分析了各种流型下的压降分布特性,并绘制了基于气液表观动能通量的不同流量下气液两相流的流型图,直观的表示出各种流型的分布区域及各流型间的流型转换边界,与已发表文献的实验结果对比符合较好。The flow pattern plays a fundamental role in analysis of heat transfer, flow instability and critical heat flux in two-phase flow. Based on the VOF （Volume of Fluid） multiphase model,a numerical simulation of upward gas-liquid two-phase flow in vertical rectangular channel has been investigated. The superficial velocity ranges from 0.1 to 110 m/s for gas,and from 0.1 to 3.2 m/s for liquid. The results show that the main flow patterns of gas-liquid two-phase flow in the channel are bubbly flow, slug flow, churn flow and annular flow. The simulation reveals the connections between the void fraction distribution and flow patterns, and the relationship between the void fraction and the volume fraction of gas-phase flow. The pressure drop characteristic is analyzed under different flow patterns. The flow pattern map is drafted based on the apparent gas-liquid kinetic energy flux under different mass flow rate, and the map shows the distribution of various flow patterns and the transition boundary among flow patterns. The simulation agrees well with the experimental results in the published literature.

关 键 词：气液两相流 含气率 流型 VOF 

分 类 号：TQ021.4[化学工程] TK121[动力工程及工程热物理—工程热物理]