The assumption that a smooth wall finish, such as stainless-steel mill finish as opposed to carbon steel, will give mass flow in a less steep cone is not always valid. This paper presents case studies of how the kinematic angle of friction (φ′) between dry bulk solids and bin walls affects the design of mass flow hoppers and how it varies for different materials.
Flow of Dry Bulk Solids on Bin Walls
P. L. Bernache
Monsanto Company, St. Louis, Mo.
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Bernache, P. L. (May 1, 1969). "Flow of Dry Bulk Solids on Bin Walls." ASME. J. Eng. Ind. May 1969; 91(2): 489–492. https://doi.org/10.1115/1.3591606
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