Empirical Equations for the Power Requirement of Mixing Impellers, Having a Wide Range of Applicability

Abstract

1) An empirical equation by which to calculate the power consumption of paddle-agitators were obtained as follows:(27)where(19)(22)(23)This equation has a wide range of applicability with slight errors.The powers consumed by the impellers having various number of blades can be calculated by the method of approximation mentioned in the previous report1).2) The maximum power consumption of paddle-agitators can also be calculated by Eq. (27), in which for Re are substituted the values of Rc, and Rθ obtained from the following equation.For the paddle having a blade angle of 90°, (28)For the paddle having an arbitrary angle of θ, (30)3) Fairly good agreements were obtained between those values calculated by the equations and those obtained by the experiments.