目的 揭示常用数值模拟曳力模型对颗粒水平运动状态影响的机理。方法 基于CFD-DEM数值模拟方法,从颗粒固相浓度、管内压力损失变化、气固两相速度分布、气体-壁面切应力及颗粒-壁面切应力和气相湍流强度等角度,对比Gidaspow等4种商用软件中常用曳力模型模拟水平直管密相气力输送的过程特性。结果 随着轴向距离的增加,4种模型预测固相浓度均先增大后减小,且管内沉积区面积逐渐减小、悬浮区面积逐渐增大;4种曳力模型预测的气体-壁面切应力随轴向距离的增加而减小,颗粒-壁面切应力随轴向距离的增加而增加;气相湍流强度随轴向距离的增加呈现出先增大后减小的趋势,且管道中心处气相湍流强度最大,越靠近壁面处气体湍流强度越小。结论 Wen-Yu模型预测了最大的水平管固相浓度、最小的单位管长压降（最小单位压降为1 000.76 Pa/m）、最小的颗粒速度以及最大气相湍流强度,Syamlal-O'Brien模型则与之相反。
Abstract
The work aims to reveal the mechanism of how commonly used numerical simulation drag models affect the horizontal motion state of particles. Based on the CFD-DEM numerical simulation method, the process characteristics of horizontal straight pipe dense-phase pneumatic conveying simulated by the commonly used drag models in four commercial software such as Gidaspow were compared from the perspectives of particle solid phase concentration, variation of pressure loss in the pipe, velocity distribution of gas-solid two-phase, gas-wall shear stress, particle-wall shear stress and gas phase turbulence intensity. With the increase of axial distance, the solid phase concentrations predicted by the four models all increased first and then decreased, and the area of the deposition zone in the tube gradually decreased while the area of the suspension zone gradually increased. The gas-wall shear stress predicted by the four drag force models decreased with the increase of the axial distance, and the particle-wall shear stress increased with the increase of the axial distance. The intensity of gas-phase turbulence showed a trend of first increasing and then decreasing with the increase of the axial distance. Moreover, the intensity of gas-phase turbulence was the greatest at the center of the pipeline, and it decreased as it got closer to the wall. The Wen-Yu model predicts the maximum solid phase concentration in the horizontal pipe, the minimum pressure drop per unit tube length, with the minimum pressure drop being 1 000.76 Pa/m, the minimum particle velocity, and the maximum atmospheric turbulence intensity. The Syamlal-O'Brien model is the opposite.
关键词
CFD-DEM数值模拟 /
流动特性 /
曳力模型 /
气固两相流
Key words
CFD-DEM numerical simulation /
flow characteristics /
drag models /
gas-solid two-phase flow
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基金
国家自然科学基金（52275110）; 河南省高校科技创新人才（24HASTIT044）; 中原英才计划（育才系列）—中原青年科技创新人才
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