Abstract
The authors determine the conditions of similarity for restricted motion of grains in a stream at constant velocity which are common with the conditions for free motion governed by the similarity rule of Reynolds. In the Reynolds number for restricted conditions, the characteristic parameter should be a linear quantity characterizing the thickness of the layer of liquid diverted by the body. In this case the relation between the coefficient of resistance ψre and the Reynolds number Re l for restricted conditions takes the form of straight-line graphs passing through points on the Rayleigh curve corresponding to ψ0 and Re0 for free motion of the grains. These relations permit us to take detailed account of the variation in the degree of mutual influence between the grains in relation to their hydraulic dimensions. The expression for restricted motion of grains, based on the relation ψre =f(Re l ), embraces the whole possible range of degrees of dilution of the grains and can be used in practical calculations.
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