通风管道弯头内粒子沉积的模拟

Simulation of Aerosol Deposition in the Bends of Ventilating Ducts

采用数值方法对矩形弯头中的气溶胶粒子沉积规律进行了模拟,并分析了不同的弯头截面宽高比和弯曲比时粒子的相对沉积率,给出了输送过程中弯头内粒子的浓度场图谱.结果指出,粒子沉积率随弯曲比和粒子Stokes数的增加而上升,湍流扩散对小粒子沉积影响明显,但大粒子在弯头内的沉积主要受惯性作用控制.

Aerosol deposition in rectangular bends of ventilating ducts are simulated by employ a numerical code, the relative deposition rate of aerosols in the bends with different width-to-height ratios of inlet and curvatures are analyzed, and the distribution features of aerosol concentration fields in the bend are also obtained and estimated. The results show that the deposition rate should be enhanced with the increase of the curvature and particle Stokes number, turbulent diffusion can affect the deposition rate of fine aerosols, and the sedimentation of coarse particles are primarily dominated by inertial effect.