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The equation is: mu_c = mu[1 - 2.104 d/D + 2.09 (d/D)^3 - 0.95 (d/D)^5]

where mu_c is the corrected viscosity, d is the diameter of the sphere and D the diameter of the pipe.

Does anyone know the origin of this equation, or whether it is accepted? I've been googling it for the past half an hour, but I'm yet to find anything! Thanks.