Fluid flow characteristics and particle motion behaviors of an asymmetric impinging stream are investigated via the computational fluid dynamics-discrete element method at different values of inlet velocity ratio (v), under equal mean inlet velocity. The results indicate that compared with the symmetric impinging stream, the impingement region deviates toward the fluid with lower velocity. A parameter tr is proposed to measure of the particle oscillation time under different conditions of impinging streams. The asymmetric impinging stream provides higher cost performance and tr than the symmetric impinging stream in terms of the single-particle residence time. The asymmetric impinging stream provides enhancement of multi-particle mean residence time over symmetric impinging stream for greater number of oscillatory motion. A critical value of v (v = 0.9 in this work) in multi-particle motions has higher cost performance than symmetric impinging streams in terms of particle residence time and engineering cost.