Abstract： To find out the influence of cross-section shape and orientation angle of fibers on capture efficiency, pressure drop and comprehensive performance of filters, the particle capture process from three noncircular fibers of triangular, cross and trilobal in fibrous filters was studied. The lattice Boltzmann-cellular automation (LB-CA) gas-solid two-phase model was applied to quantitatively describe the motion of particles. The capture efficiency due to three capture mechanisms of diffusion, interception and inertial impaction were calculated and compared with the circular fibers with the same volume fraction. The results show that for the cross and trilobal fibers, the larger the aspect ratio is, the higher the capture efficiency can be achieved. For the particles with medium size when mainly dominated by interception mechanism, the triangle and trilobal fibers with orientation angle of 60° have higher capture efficiency.

Keywords: lattice Boltzmann method; noncircular fiber; capture efficiency; fibrous filte