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Calculating Power number of stirred vessel

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Old   June 6, 2023, 08:43
Default Calculating Power number of stirred vessel
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Joe walker
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I am simulating a 2D planar baffled mixing tank with a rushton turbine as the agitator, and I'm having difficulties getting Power number values from from torque. Using the equation
Np= 2*pi*N*m*torque/(Diameter^5)*density*N^3
m=number-of-blades, N=rotational-speed ,
I am using the calculating torque from a moment plot on the impeller blades, which I assume means that is the total torque thus m=1 instead of 6.
This still results in my solution converging around Np=16.6. Eventhough standard Np for the test case is ~5.
My question is, is this difference explainable from simplifying 3D to 2D, or have I made an error somewhere.

Any help is greatly appreciated
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fluent, power coefficient, power consumption, power number, stirred vessel

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