气溶胶粒子在矩形风管中沉降速度的试验研究  

Experimental Study on Deposition Velocities of Aerosol Particles in Rectangular Duct

作　　者：朱青松[1] 李念平[1] 付峥嵘[1] 肖书博[1] 周慧[1] 

机构地区：[1]湖南大学,湖南长沙410082

出　　处：《流体机械》2007年第11期5-9,共5页Fluid Machinery

基　　金：教育部高等学校博士学科点专项基金项目(20050532022)

摘　　要：用滑石粉来模拟气溶胶粒子,对矩形风管系统(材料为镀锌钢板)的直管段和弯管段在不同的风速和粒径下,测定了不同风管表面的沉降速度,分析了它们之间的关系。试验结果表明,风管断面的沉降速度随风速和粒径的增大而增大;对于水平直管段,同一断面下底面的沉降速度最大,侧壁面次之,顶面最小;对于弯管段,外侧壁面和顶面的沉降速度比直管段有明显增加,内侧壁面减小。French chalk is use to simulate aerosol particles. The deposition velocity of the different sections duct was determined under the different air speeds and the different particle sizes to the straight horizontal sections and the bend sections of the rectan2 gular ductwork （ material is zinc-plated steel ） , and the relationship between them was analyzed. Experimental result shows that the deposition velocity of the duct increases with the increase of the air speed and the particle size. For the straight horizontal sections, the deposition velocity of one and the same cross section to be highest at duct floors, intermediate at duct walls, and lowest at duct ceilings. For the bend sections, the outside side wall and the ceiling contain obvious increment comparing ＇with the straight horizontal sections, and the inside wall contains obvious decrement.

关 键 词：气溶胶粒子 沉降速度 直管段 弯管段 

分 类 号：TU834[建筑科学—供热、供燃气、通风及空调工程]