What might be the form of a correlation for the critical stirrer speed for particle suspension if the impeller speed is assumed to be a multiple of, or an exponential function of, the terminal velocity of the particles? Consider both very small and moderately large particles and compare your proposed correlation with Zwietering's empirical equation [Eq. (9.35)].

Eq. 9.35

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(40) P n_D%5 = $viD2| 0.45 B313 (9.35)