Hopper Design Powder Flow
The hopper angle required to allow mass flow depends on the effective angle of friction δ, the wall friction angle, and the geometry of the hopper. Figures 2 and 3 provide recommended mass flow hopper angles for conical hoppers and hoppers with flat walls and slotted outlets based on analyses developed by Jenike [1,2]. Values of the allowable hopper angle θ' are on the horizontal axis, and
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