Based on the analytical treatment of boundary layer, the author revealed that the frictional resistances of a rotating disk in a non-Newtonian fluid of infinite extension are approximately found by using the momentum equations in both cases of a laminar and a turbulent boundary layer flow. As a result of these analytical treatments, it has also been revealed that the relation between the Reynolds number R
6* and the resisting moment coefficient C
M of a rotating disk in non-Newtonian fluids having different values of the rheological constant n is identical with the relation between R
s and C
M of the rotating disk in a Newtonian fluid.
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