空调通风管路中细颗粒物凝并的数值分析

Numerical Analysis of Fine Particle Coagulation in the HVAC Pipe

将细颗粒物凝并为可吸入颗粒物是利用空调系统净化细颗粒物的重要技术手段。应用亚微颗粒凝并概率模型,采用数值方法对空调风管中细颗粒的凝并现象进行了研究。结果表明,细颗粒物在空调通风管路中具有凝并现象,风管入口处细颗粒物的体积分数越大、风速越大凝并强度越大,风管出口处颗粒物的平均粒径越大。此外还发现,布朗扩散作用下大于1μm的细颗粒物未见明显凝并现象,风管弯头部位未见凝并效果明显增强。

Coagulating fine particles into particulate matter is an important mean to clean fine particles in air conditioning. Submicron particle coagulation probability model is applied to calculate fine particle coagulation in the air dust. The results show that Coagulation phenomenon exists in the air-conditioning and ventilation pipe between the fine particulate matter; the greater the inlet overall integral number of particles and the greater the inlet wind speed, the more obvious the submicron particles coagulation, the greater the average particle size of particles at the exit. In addition, no obvious condensation phenomenon showed on fine particles which is greater than 1 micron, no obvious effects of coagulation enhanced in dust bend.