The paper by Chen and Fryrear (2001) addresses a much-neglected topic in the general field of grain dynamic behavior, but it is unfortunately marred by a number of omissions and inaccuracies. First, some minor errors have to be pointed out, which may mislead some readers if not corrected:

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Moving from nit picking to the nitty gritty: The main problem with the Chen and Fryrear (2001) paper is the reported terminal velocities. In the first place, for grain sizes of 0.0015, 0.0026, 0.0039, and 0.0049 cm settling within the Stokes range (Re < 1), the reported velocities of 6, 12, 17...

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