Interaction of Gas and Particles in Turbulent Flow

湍流中气体和颗粒的相互作用

• 批准号: 07650212
• 负责人: TOMITA Yuji
• 金额: $ 1.34万
• 依托单位: Kyushu Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650212/
• 关键词: Pipe Flow; Multi-Phase Flow; Numerical Analysis; Coarse Particles; LDV Measurement; Turbulent Interaction Model; LDV計測; 抗力係数; 静止浮遊; 気流速度; 粒子速度

Interaction between turbulent gas flow and coarse particles in horizontal pipes are examined numerically and experimentally. In the experiment, particle velocity, gas velocity and axial turbulent fluctuation of gas are measured by using LDV,where the particle mean diameter and the density are 1.6mm and 1024kg/m^3, respectively, and the pipe diameter and the length are 79.8mm and 7.5m, respectively. In the calculation, a turbulent interaction model between gas and coarse particles is proposed to calculate the gas-particle flow using the k-epsilon model. A two-way coupling calculation is carried out, based on the Lagrangian approach for the particles and the Eulerian approach for the gas. Furthermore, collision between particles and between particle and pipe wall, and rotation of particle are also considered. Governing equations are solved numerically to give particle velocity, concentration, pressure loss, gas velocity and turbulent intensity, which are compared with the results of LDV measurements as well as published data, and those measurements are well predicted by the present model.

对水平管内湍流与粗颗粒的相互作用进行了数值模拟和实验研究。在实验中，用激光测速仪测量了颗粒平均直径1.6 mm，密度1024 kg/m~3，管径79.8 mm，长度7.5m的气体颗粒速度、气速和轴向湍流脉动。在计算中，采用k-epsilon模型计算气固两相流动，建立了气固两相流动的湍流相互作用模型。基于颗粒的拉格朗日方法和气体的欧拉方法进行了双向耦合计算。此外，还考虑了颗粒间的碰撞、颗粒与管壁的碰撞以及颗粒的旋转。对控制方程进行了数值求解，得到了颗粒速度、浓度、压力损失、气体速度和湍流强度，并与LDV测量结果和已发表的数据进行了比较，结果表明该模型能很好地预测这些测量结果。