To prevent the formation of a stable rathole, the hopper outlet diagonal should equal or exceed the critical rathole diameter, DF. We use cookies to provide our services, analytics, and marketing. Particularly when using Jenike's own An envelope of the Mohrs semicircles forms the effective yield locus (Figure 4). "About" page to know more about those cookies and technologies . The physical properties and direct shear test data of the ten food powders served. This will continue to broaden the flow channel, and this cyclic fail-flow-empty cycle will continue until the hopper empties. below a hopper are the following : Table 2 : Pressure effects during powder discharge. For random-sized material, the inside width of the opening (between skirts) should be a minimum of 2.5 times the diameter of the largest particle.