Compute a limiting value of the hopper outlet dimension (Dmin) and the consolidating stress, ?1 (kN/m2 ) to ensure the flow of bulk materials from the following data: A flow factor (ff) =1.5. Bulk density of the material underflow condition (?b) = 1595 kg/m3 . Unconfined yield stress, ?c = 1.8 kN/m2 , Assume the empirical dimensionless factor, J, is 2.46.