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Model a Perforated Cone: Please help

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Old   July 15, 2012, 07:13
Unhappy Model a Perforated Cone: Please help
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S.Bogoda
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Dear All,

I am going to model a perforated cone. The flow (gas) transports through a perforated cone.

01. As the cone diameter varies with streamwise direction, do I want to specify 'loss model' along streamwise direction?

02. How can I get empirical formulas for Resistance Coefficient?

I would be much grateful if you can help me to clarify those.

Thanks.
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Old   July 15, 2012, 08:17
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Glenn Horrocks
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You can get information on resistance coefficients from manufacturers of this equipment or your own test data. You can also estimate it from basic fluid mechanics - for instance assuming perforations behave like lots of little oriface flows in parallel. Expect a large margin of error when you do this, of course.
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Old   July 15, 2012, 09:58
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Dear ghorrocks,
Thanks a lot for the reply. Actually, the applying a perforated cone is to increase the pressure drop and so I donít have more data.
Ok, Iíll try with your suggestion.
Thanks again.
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Old   July 15, 2012, 18:41
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Oh yes, and of course there is another option - do a simulation of the actual perforated design just to get the resistance of it, then use that resistance in a larger system model.
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Old   July 16, 2012, 22:29
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Dear ghorrex,

Thanks again for your sugssion. I desided to do experiments and try to get the resistance.

I will try CFX model after then.

Thank you very much.
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