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Old   March 10, 2015, 11:01
Default Experimental CFD validation
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I'm working on a CFD model of a stirred reactor filled with water and want to validate the output (flow profile, flow speed) by comparision with experimental results.
The experimental reactor has proportions that are 1/7th of the modeled one and is filled with water as well. Model reactor has 94rpm, impeller diameter of 1210mm. I downscaled the experimental impeller by keeping original proportions of impeller dimensions and proportion of impeller diameter and reactor diameter. Exp. reactor has thereore impeller diameter of 165mm.

However, for the rotation speed n I don't know how to proceed. My aim is to get a similar flow profile within the experimental reactor as in the original one that is being modeled.

n(exp)=n(model) probably doesn't make sence.

peripheral speed (exp)=peripheral speed(model) results in 690rpm for exp. conditions, compared to 94rpm for model conditions.

The approach I would normally choose is to keep Stirrer Reynolds number constant, Re(exp)=Re(model)
and therefore using
n(exp)*impeller diameter (exp)^2 = n*impeller diameter (model)^2

However this leads to rotational speed of the exp. impeller of 5055rpm,
more than practically can be handeled.

Any ideas how to proceed from here?
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