Dave Dickey Forum Moderator 245 Posts
Re: How do you calculate the power required for helical impeller mixer?22 March 2010 at 1:29pm
You left out one essential piece of information needed to calculate the power, and that is the rotational speed. So here are a the power requirements for a few appropriate speeds:
60 rpm 1,400 W
50 rpm 936 W
40 rpm 599 W
30 rpm 337 W
The viscous power number for the impeller is 312. Viscous power number is Power divided by all the following (Viscosity times Rotational Speed squared times Impeller Diameter cubed). Of course the units of the variables must be consistent to obtain a dimensionless relationship.
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