颗粒物在风洞内树枝尺度的小叶黄杨上的沉积

Particles Deposition to Buxus Microphylla Branches in a Wind Tunnel

为了估计小叶黄杨对空气中颗粒物的吸附效果,通过搭建风洞试验台,测量了小叶黄杨的一部分枝叶对颗粒物的捕集效率.试验结果表明,随着风速的增大,捕集效率先减小后增大.此外,通过捕集效率与风速可计算出颗粒物沉积速度的试验值.当风速为0.86m/s、颗粒物粒径为1.0μm时,沉积速度vd达到最小值0.85cm/s.依据均质纤维捕集层捕集理论计算出颗粒物沉积速度的理论值,且对比结果发现试验值与理论值比较吻合.

In order to estimate the adsorption effect of buxus microphylla on airborne particulate matter, by building a wind tunnel experiment, the capture efficiency of aerosol particles by the branch scale vegetation is measured. The experimental results show that with the increase of wind speed, the capture efficiency decreases and then increases. In addition, the experimental values of the particle deposition velocity are calculated based on the capture efficiency and the wind speed. When the wind velocity is 0.86 m/s and the particle size is 1.0 μm, the deposition velocity vd has a minimum value of 0.85 cm/s. The theoretical value of the deposition velocity of the particles is calculated based on the theory of the trapping of the homogeneous fiber. It is found that the experimental values are in agreement with the theoretical values.