气溶胶粒子在裂隙中穿透特性实验研究

为研究气溶胶颗粒通过房屋裂隙进入室内的穿透特性,用铁质矩形裂隙在实验室进行模拟实验研究。结果表明:气溶胶粒径、气体流速和裂隙高度对气溶胶的穿透率影响比较显著;流速和裂隙高度增加会增大气溶胶的穿透率;不同粒径的气溶胶在相同实验条件下穿透率存在明显差异,最易穿透的是粒径在0.5μm左右的粒子,小粒子和大粒子分别在Brownian扩散作用和重力沉降作用下穿透率低。

Experimental Study of Aerosol Particles Penetration Through Cracks

In order to study the aerosol particle penetration through surrogates of cracks in building envelopes,the simulating experiments were done in laboratory.The particle size and velocity of flow and crack height were the three main factors that governed fractional particle penetration.The particle penetration increased for higher velocity of flow,and with height of crack grows the penetration increased too.The supermicron and ultrafine particles were significantly removed by means of gravitational settling and Brownian diffusion,respectively.The particles in size about 0.5 μm had the highest penetration.