Model a Perforated Cone: Please help

sakurabogoda · July 15, 2012, 07:13

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.

ghorrocks · July 15, 2012, 08:17

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.

sakurabogoda · July 15, 2012, 09:58

Dear ghorrocks,
Thanks a lot for the reply. Actually, the applying a perforated cone is to increase the pressure drop and so I don’t have more data.
Ok, I’ll try with your suggestion.
Thanks again.

ghorrocks · July 15, 2012, 18:41

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.

sakurabogoda · July 16, 2012, 22:29

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.

July 15, 2012, 07:13	Model a Perforated Cone: Please help	#1
sakurabogoda Senior Member S.Bogoda Join Date: Jul 2012 Posts: 133 Rep Power: 13	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.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
multiphaseInterFoam for RAS turbulence model	chiven	OpenFOAM Bugs	8	December 6, 2017 02:08
2 stage axial turbine model convergence issues	sherifkadry	CFX	2	September 7, 2009 20:51
flow in perforated pipe distributor	pertupd	ANSYS	0	August 12, 2009 08:36
multi fluid mixture model issue	rystokes	CFX	3	August 9, 2009 19:13
Advanced Turbulence Modeling in Fluent, Realizable k-epsilon Model	Jonas Larsson	FLUENT	5	March 13, 2000 03:27

July 15, 2012, 08:17		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,692 Rep Power: 143	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.

July 15, 2012, 09:58		#3
sakurabogoda Senior Member S.Bogoda Join Date: Jul 2012 Posts: 133 Rep Power: 13	Dear ghorrocks, Thanks a lot for the reply. Actually, the applying a perforated cone is to increase the pressure drop and so I don’t have more data. Ok, I’ll try with your suggestion. Thanks again.

July 15, 2012, 18:41		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,692 Rep Power: 143	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.

July 16, 2012, 22:29		#5
sakurabogoda Senior Member S.Bogoda Join Date: Jul 2012 Posts: 133 Rep Power: 13	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.