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— Agitator Power Draw

Impeller Reynolds number and shaft power for a stirred tank, P = N_p·ρ·N³·D⁵, with the power number taken from the flow regime (laminar N_p = K_L/Re, turbulent N_p constant).

Solution

History

Sources:
[1] W. L. McCabe, J. C. Smith, and P. Harriott, Unit Operations of Chemical Engineering, 7th ed. New York, NY, USA: McGraw-Hill, 2005.
[2] J. H. Rushton, E. W. Costich, and H. J. Everett, "Power characteristics of mixing impellers, Parts I and II," Chem. Eng. Prog., vol. 46, no. 8, pp. 395–404, and no. 9, pp. 467–476, 1950.
[3] D. W. Green and M. Z. Southard, Eds., Perry's Chemical Engineers' Handbook, 9th ed. New York, NY, USA: McGraw-Hill Education, 2019.

Reference content only — not a substitute for professional engineering judgment. Verify all values, tolerances, and specifications against current official standards before use in production or safety-critical work. Provided without warranty of accuracy or fitness for any purpose.