Convergence of Fine Particles under Standing-Wave Condition

Both numerical and experimental investigations on motion of fine particles (PM_2.5) in a standing-wave sound field are carried out. Through numerical simulations, it is found that a standing-wave sound field can cause remarkable convergence of PM_2.5, producing two particle number density peeks in range of a wavelength. The convergence behavior of fine particles undergoing acoustically induced movements was also experimentally observed. The results indicate that air oscillating due to acoustic excitation is the main reason for movement and convergence of the PM_2.5 in a horizontal standing-wave sound field.