风速对室内纳米粉尘扩散影响的数值模拟研究

Numerical Simulation of the Influence of Wind Speed on Indoor Nanometer Dust Dispersal

纳米材料目前广泛应用于很多行业,而纳米材料在生产过程中造成的粉尘经扩散对人体有一定的伤害。本文以纳米二氧化钛粉尘为例,以对人体伤害浓度下限为起点,研究在不同风速下室内粉尘扩散情况。研究通过对室内环境参数的实际测量,建立合适的物理模型与数学求解方法,用GAMBIT进行网格划分和边界设置,使用FLUENT等软件进行迭代求解和结果处理,结果发现通风对于粉尘扩散的影响较大,而且风速越大粉尘浓度降低得越快。此模型在风速2m/s时粉尘浓度下降稳定,且在粉尘出现区域绝大部分浓度均低于人体伤害最低浓度下限。

At present, nano-materials are widely used in many industries, the dust diffusion in the production process of nano-materials is harmful to human body. Taking nanometer titanium dioxide particles as an example, this paper studied the indoor dust diffusion in different wind speed based on the damage concentration limit to human body. Firstly, it established appropriate physical model and mathematical method by measuring indoor environmental parameters, then it optimized mesh and boundary condition using GAMBIT, completed iterative solution and result processing using FLUENT and other software. Finally, the effect of different wind speeds on dust diffusion was found. Results show that ventilation has great influence on dust diffusion, and the faster the wind speed, the faster the dust concentration decreases. When wind speed is 2 m/s, the dust concentration is stable, and the dust concentration in most regions is lower than the lowest damage limit to human.