After getting separated from the su

After getting separated from the suction hole, the cleared onion seeds cease to bear the suction force in the drum. Instead, they are subject only to centrifugal force, supporting force, the friction force applied by the drum on the seeds and the gravity of the onion seeds. Thus, the equilibrium equation of the momentary stress is established as follows.friction angle φ between the onion seeds and the stainless steel drum (Qi et al., 2015).