泰勒涡流流动及强化传热数值研究

Simulation study on flow and enhanced heat transfer performance of Taylor vortex flow

泰勒涡流为叠加于剪切流之上的二次流,其具有强化传热作用,在航空、水处理、制药工程和化工等领域都具有很大的应用价值。运用Fluent软件,建立长径比Γ=30的模型并对同轴套管间的流态演变和传热特性进行了数值模拟。模拟结果显示了环隙内流体流态随着内筒转速增加的演变过程,表明在存在径向温差的情况下,涡流的存在强化了传热效率。对不同转速下的强化传热效果进行了对比分析,并确定了最佳状态点。

Taylor vortex flow,as a secondary flow superimposed on shear flow,enables to enhance the heat transfer of the fluids with wide application in the fields of aviation,water treatment,pharmaceutical,chemical engineering and so on.A model with an aspect ratioΓ=30 was built using fluent software.And the numerical simulation of flow patterns and heat transfer performance between coaxial sleeves was conducted.The simulation results showed the evolution of flow patterns in the annulus space with the increased rotation speed of inner sleeve,which indicated that the presence of vortex flow could enhance the heat transfer efficiency under the radial temperature difference.The comparative analysis of enhanced heat transfer performance under different rotation speeds was performed.The optimum condition was determined.