Hydrodynamic Study of Pneumatic Grain Separation (II)

Settlement of Winnower Breadth within Air Turbulent Flow Path

Abstract

On the occasion of two viscous turbulent flow in the theory of turbulence boundary layer cause the incompressive symmetric mixing flow at the contact point, the thickness of mixing range of turbulence was decided. The winnower breadth was calculated by induction method, and the author checked up whether this breadth was suitable or not.
The calculation of winnower breadth was made to apply the mean velocity of turbulent flow that was in measuring points of air velocity by previous report. The maximum permissible length was decided by drawing curve parallel to curve that measured the real height at points of grain separation.
The calculation was applied at the inlet point, the grain flowing plate, and the way out of main winnower and sub-winnower of the experimental rice huller.
As the result, this condition was fully satisfied, because the practical breadth at each way out was smaller than the calculated size.