摘要：为掌握雾化液滴对湿法采集纳米气溶胶的影响作用, 考察不同喷雾流量和雾化室尺寸对采集效率的影响, 并通过Fluent软件仿真模拟不同尺寸雾化室内雾化液滴的运动状况, 了解液滴对湿法采集的影响机理。结果表明, 雾化室中的液滴作用以润湿包覆为主, 而储液腔中的液滴主要以碰撞凝并实现对气溶胶粒子的捕获, 润湿包覆对纳米气溶胶粒子的采集效果大于碰撞凝并的捕获效果。当雾化室和储液腔的喷雾流量均控制为40 mL/min时, 湿法采样器的采集效率可达到最高 (92%) 。仿真和实验结论均表明, 雾化室的最佳尺寸是高度为170 mm, 内径为60 mm。

关键词：湿法采样器；雾化液滴；采集效率；仿真模拟

Abstract：In order to know well the function and influence of atomized droplets on collection efficiency in wet sampler, the effects of different spray flow rates and spray tower sizes on collection efficiency were investigated by self-made wet sampler, and the movement of atomized droplets in spray tower with different dimensions were simulated via the Fluent software. The results indicate that the chief function of atomized droplets in spray tower is wetting coating, and the mainly function of atomized droplets in fluid reservoir is collection. However, the former contribution is greater than the latter. The collection efficiency of wet sampler can be as high as 92% with both flow rates of atomized droplets are 40 mL/min. Simulation and experimental results show that the best of dimension of the spray tower is height of 170 mm and inner diameter of 60 mm.

Keywords：wet sampler; atomized droplets; collection efficiency; analogy simulation