Resistance Loss Coefficient

drb764 · March 13, 2011, 09:53

Hello,
can someone tell me how to calculate the "Resistance Loss Coefficient" and/or the "Linear Resistance Coefficient" for use in the CFX Porosity Settings Tab?
Found nothing on the web unfortunately, so thanks a lot in advance!

ghorrocks · March 13, 2011, 18:01

You use the coefficients to match a porous medium to experimental results. Do youy have experimental results?

jiguozhao · March 13, 2011, 22:44

make use of you experiment data of pressures and velocities. you can refer the equation 1.146 in ANSYS CFX-Solver Theory Guide, at page 33. then you can obtain Kperm and Kloss via your experimental data. you can contact me if you like, because i just studied that days ago.
g.ji@uq.edu.au

drb764 · March 14, 2011, 06:14

what i have are the laminar and turbulent permeabilities k1 and k2 which correspond to this equation:

dP/L = mu/k1 * U + rho/k2 * U^2

Looks similar to the equation in Solver Theory Guide, but are these the values I need?

Thank you so far!

will321321 · April 21, 2014, 02:28

Hi Gentlemen,

I am on the process of calculating the Linear & Quadratic loss coeff. Via experimental Data (V vs P) but the equation im getting from the graph is giving a negative (-) Value for permeability.

Please Help me remedy this problem.

Thank you very Much.
-will

March 13, 2011, 09:53	Resistance Loss Coefficient	#1
drb764 New Member K. D. Join Date: Feb 2011 Posts: 6 Rep Power: 15	Hello, can someone tell me how to calculate the "Resistance Loss Coefficient" and/or the "Linear Resistance Coefficient" for use in the CFX Porosity Settings Tab? Found nothing on the web unfortunately, so thanks a lot in advance! Last edited by drb764; March 13, 2011 at 10:20.

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March 13, 2011, 18:01		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	You use the coefficients to match a porous medium to experimental results. Do youy have experimental results?

March 13, 2011, 22:44		#3
jiguozhao Member Ji Guozhao Join Date: Jan 2011 Posts: 43 Rep Power: 15	make use of you experiment data of pressures and velocities. you can refer the equation 1.146 in ANSYS CFX-Solver Theory Guide, at page 33. then you can obtain Kperm and Kloss via your experimental data. you can contact me if you like, because i just studied that days ago. g.ji@uq.edu.au

March 14, 2011, 06:14		#4
drb764 New Member K. D. Join Date: Feb 2011 Posts: 6 Rep Power: 15	what i have are the laminar and turbulent permeabilities k1 and k2 which correspond to this equation: dP/L = mu/k1 * U + rho/k2 * U^2 Looks similar to the equation in Solver Theory Guide, but are these the values I need? Thank you so far!

April 21, 2014, 02:28		#5
will321321 New Member Join Date: Apr 2014 Posts: 29 Rep Power: 12	Hi Gentlemen, I am on the process of calculating the Linear & Quadratic loss coeff. Via experimental Data (V vs P) but the equation im getting from the graph is giving a negative (-) Value for permeability. Please Help me remedy this problem. Thank you very Much. -will