曳力模型对发送罐内两相流动及出料特性的影响

曳力是表征气固相间作用的关键参数,以欧拉双流体模型为基础,以Gidaspow、Syamlal-O'Brien和Huilin曳力模型为研究对象,分析不同曳力模型对罐内两相流动和出料特性的影响。将不同入口气速下的出口质量流量与实验数据进行对比,分析不同曳力模型适用的入口条件。计算结果表明:根据入口速度与模型的匹配度,可将曳力模型划分为三个区间;G区的Gidaspow模型,罐内速度和湍动程度最大并且与实验数据吻合度最高;Syamlal-O'Brien的计算结果略小于Gidaspow模型;只有在S区,Syamlal-O'Brien才与实验值较为吻合;用Huilin模型计算的整体速度和质量流量最小,当速度增大到0.15 m/s以上的h区才与实验结果接近,为发送罐内两相流动的研究提供理论依据。

Influence of Drag Force Model on Two-Phase Flow and Discharge Characteristics in Discharge Blow Tank

The drag force is a key parameter to represent the interaction between gas and solid phases. Based on the Euler two-fluid model, the Gidaspow, the Syamlal-O''Brien and the huilin drag model are taken as the object of study. The influence of different drag force model on the two-phase flow and the discharge Characteristics of tank were analyzed. Then, the outlet mass flow rate at different inlet gas velocity is compared with the experimental data, analysis of different drag models can adapt to the inlet conditions. The calculation results show that the drag force model can be divided into three intervals according to the inlet velocity and the model matching degree. The Gidaspow model of G region has the highest velocity and turbulence degree in the tank and the highest degree of agreement with the experimental data. Syamlal-O''Brien calculated the results slightly smaller than the Gidaspow model. Only in the S region, Syamlal-O''Brien is close to the experimental value. The overall velocity and mass flow rate calculated by the huilin model is the smallest, and when the velocity increases to more than 0.15 m/s, the h region is close to the experimental result. This provides the theoretical basis for the study of the two-phase flow in the discharge blow tank.