摘要
本文采用拉格朗日模型对不同送风速度下,直径为1μm～100μm的粒子在水平光滑通风管道内的沉积情况进行了数值模拟,分析了送风速度和粒径对沉降速度的影响。结果表面,在水平管道中,粒子在管道底部的沉降速度高于垂直壁面和顶部,沉降速度受送风速度和颗粒物直径影响很大。以南京地区大气中颗粒物的浓度为依据,按照风管清洗规范,针对不同过滤效率的风管,对其使用时间进行了评价。
To numerically simulate particles deposition velocity in smooth horizontal ventilating ducts, the Lagrangian model was applied. Based on the simulation, the relationship among supplying velocity, diameter and deposition velocity was analyzed. The results show that deposition velocity to floors is higher than those to vertical wall and ceiling surface and they are all highly dependent on the magnitude of the air supplying velocity and particle diameter. According to the particles concentration in the atmosphere of Nanjing and the standard of ventilating duct, the accumulating time of ventilating duct under different filter efficiency was appraised.
出处
《建筑热能通风空调》
2009年第3期44-46,60,共4页
Building Energy & Environment
关键词
通风管道
粒子沉积速度
粒径
拉格朗日模型
ventilating duct, deposition velocity, particle diameter, Lagranian model
