摘要
该文考虑液滴的碰撞和破碎以及水平和下旋气流的影响,采用离散相模型对空中释放的气溶胶云团在开放空间中的气液两相流流场进行仿真,获得气溶胶颗粒群的运动规律,并进行了实验验证。由仿真模拟和实验可知,在水平和下旋气流速度均较小(小于1 m/s)、喷射角度大于30°、初始粒径为100μm、喷射速度约为80 m/s时,释放形成的气溶胶颗粒在短时间内可沉降至地面附近;当水平气流速度增大至3 m/s时,同样条件下释放的气溶胶颗粒更容易在空气中悬浮,不易沉降至地面。在上述两种情况下,喷射角度和下旋气流速度越大,气溶胶颗粒越容易沉降至地面附近。
Considering the droplets collision-breakup model and the effects of horizontal and downward airflow,the flow of aerosol released from the air to the open environment is investigated numerically by applying the discrete phase model of the gas-liquid two-phase flow. The motion characteristics of aerosol droplets in open environment are obtained and verified by experiments. The numerical and experimental results show that when the velocities of the horizontal and downward airflow are both small（ less than 1 m / s）,the ejecting angle is larger than 30°,the initial size of the particles is100 μm,and the ejecting speed is about 80 m / s,the generated aerosol particles sedimentate to theground in a short time. When the velocity of the horizontal airflow reaches 3 m / s,aerosol particles released under the same conditions show more difficulty to fall to the ground. In the two above cases,increasing the ejecting angle or the downward airflow velocity can make the aerosol particles sedimentate to the ground more easily.
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2015年第5期556-565,共10页
Journal of Nanjing University of Science and Technology
关键词
气液两相流
离散相模型
气溶胶液滴
水平和下旋气流
gas-liquid two-phase flow
discrete phase model
aerosol droplets
horizontal and downward airflow
