Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 11, 2020 - November 13, 2020
Air pollution has been advancing all over the world, and PM2.5 is a threat to human body. As one of the solutions, air filtration technology aiming at removing fine particles is drawing attention. However, the filtration mechanism is complicated and there are many uncleared aspects. Therefore, numerical analysis is an effective tool for analyzing filtration phenomenon because it is possible to pay attention to individual movements of the fine particles and it is easy to change some important parameters. In this study, in order to investigate the effects of hydrodynamic, contact, and adhesion forces on filtration performance, we performed numerical analysis using a single fiber model that can analyze the phenomenon between particle and fiber in detail. The governing equation of the fluid was the Lattice Boltzmann method with an incompressible formulation. The virtual flux method was used to represent an object of arbitrary shape in a fluid. By changing the particle diameter to 2.0, 3.0, 4.0μm, the single fiber efficiency was then obtained and compared with the results of others. As a result, the single fiber efficiency tended to decrease as the Stokes number decreased. However, the difference of single fiber efficiency was larger compared to the results of others.
