风管中颗粒物沉降速度的解析法预测模型

在分析颗粒在紊流边界层中运动机理的基础上,根据沉降速度的定义,推导出了浓度边界层微分方程及其解析解,进而得到了颗粒无量纲沉降速度的解析表达式.利用经典实验数据验证了该解析法模型的正确性.最后,对不同粒径颗粒在不同风速下的无量纲沉降速度进行了预测.预测结果表明:风速越大,颗粒的无量纲沉降速度也越大.

Analytical Prediction Model for Particle Deposition in Ventilation Ducts

Based on the major mechanisms governing particle movement in turbulent boundary layer and the definition of particle deposition velocity, the governing differentiate equation in particle concentration boundary layer and its analytical solution were deduced, and an analytical expression of dimensionless deposition velocity was achieved. Then, the rationality and the accuracy of the analytical model were verified by recent experimental data in a reference paper. Eventually, dimensionless deposition velocities of different particle diameters under two flow velocities were predicted by using the analytical model. It has been testified that the bigger the flow velocity , the more quickly the particles settle in duct walls.