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基于Smagorinsky涡黏模型以及颗粒动理学理论,建立了气固两相流双大涡模拟模型。考虑大涡模拟中过滤尺度的影响,给出颗粒相亚格子压力和热传导系数计算模型。考虑颗粒聚团对两相作用的影响,给出了考虑颗粒聚团作用的气固两相多尺度曳力系数模型。数值模拟了提升管内气固两相流动特性,合理地预测出了提升管内气固两相环-核流动结构。模拟结果与Knowlton等实测结果相吻合。
Based on the Smagorinsky eddy viscosity model and particle kinetics theory, a double-eddy simulation model of gas-solid two-phase flow was established. Considering the effect of filtration scale in large eddy simulation, the calculation model of the subgrain pressure and thermal conductivity of particles is given. Considering the effect of particle agglomeration on the interaction of two phases, a multi-scale drag coefficient model of gas-solid two-phase considering particle agglomeration is proposed. The numerical simulation of the gas-solid two-phase flow in the riser is reasonably predicted, and the gas-solid two-phase torus-core flow structure in the riser is reasonably predicted. The simulation results are consistent with the measured results of Knowlton et al.