流体机械

2021, v.49;No.588(06) 22-29

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离心萃取器混合区内气-液两相流的CFD模拟
CFD simulation of gas-liquid two-phase flow in the mixing zone of a centrifugal contactor

段五华;王澄谦;郑强;
DUAN Wuhua;WANG Chengqian;ZHENG Qiang;Institute of Nuclear and New Energy Technology,Tsinghua University;

摘要(Abstract):

由于离心萃取器的结构和流体流动较复杂,采用传统的实验难以准确获得其混合区内流场分布特性,为此,采用雷诺应力模型和自由表面模型开展了■70 mm离心萃取器混合区内气-液两相流的CFD模拟研究。模拟结果表明:混合区轴向截面上气-液两相分布为气体在环隙上部,而液体在环隙下部,且两相之间存在自由液面;随转速增大,环隙内自由液面高度减小,混合区中的主要漩涡变小;随入口水相流量(速)增大,环隙内自由液面高度增大,主要旋涡变大,而固定叶片区中的旋涡数量增加,旋涡变小。所有这些结果有助于准确认识离心萃取器中的流体流动特性,从而实现其科学设计和运行调控。
It is difficult to obtain the characteristics of the flow field distribution in the mixing zone of the centrifugal contactor(CC) by traditional experiments due to its complex structure and flow,so CFD simulation of the gas-liquid two-phase flow in the mixing zone of a ■70 mm CC was investigated using the Reynolds stress model and the free-surface model.The simulation results indicate that the distribution of the gas-liquid two phases on the axial section of the mixing zone is as follows:the gas phase is in the upper part of the annular gap and the liquid phase is in the lower part.Moreover,there is a free liquid surface between the two phases.As the rotational speed increases,the height of the free liquid surface in the annular gap and the volume of the main vortexes in the mixing zone decrease.As the flow rate of the inlet aqueous phase increases,the height of the free liquid surface and the volume of the main vortexes in the annular gap increase,while the number of the vortexes in the fixed vane zone increases,but the volume of the main vortexes decreases.All these results are helpful to correctly understand the flow characteristics in the CC and realize its scientific design and operation regulation.

关键词(KeyWords): 离心萃取器;计算流体力学(CFD);混合区;气-液两相流
centrifugal contactor;computational fluid dynamics(CFD);mixing zone;gas-liquid two-phase flow

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基金项目(Foundation): 国家自然科学基金资助项目(21978149)

作者(Author): 段五华;王澄谦;郑强;
DUAN Wuhua;WANG Chengqian;ZHENG Qiang;Institute of Nuclear and New Energy Technology,Tsinghua University;

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