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The diffusion equations of momentum, heat, and mass are solved for spiral flows of incompressible viscous fluids. General exact solutions for the steady‐state distributions of velocity, temperature, and concentration are obtained through the use of the similarity transformation technique. Also described are two typical boundary conditions which may be applied to determine the integration constants in the general exact solutions

General Exact Solutions for the Diffusion Equations of Momentum, Heat, and Mass in Spiral Viscous Flows