# Grade efficiency curves in CFX

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 January 8, 2013, 09:44 Grade efficiency curves in CFX #1 Senior Member   S.Bogoda Join Date: Jul 2012 Posts: 133 Rep Power: 5 Dear All, I want to obtain grade efficiency curves at inlet and outlet of my domain. Can anybody help me? I am using LES for Lagrangian particle tracking. I would be much grateful for your helps as I stuck on finding collection efficiency of my simulation.

 January 8, 2013, 18:18 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,831 Rep Power: 85 What is a grade efficiency curve?

 January 8, 2013, 22:13 #3 Senior Member   S.Bogoda Join Date: Jul 2012 Posts: 133 Rep Power: 5 Dear Glenn, “When we obtain particle collection efficiency of a poly dispersed sample, there is a range of particle sizes, separate with varying degrees of efficiency. This variation in the efficiency is referred to as the Grade Efficiency Curve”. In my simulation I have to obtain this grade efficiency curve. Actually, still I could not find how to obtain the collection efficiency in particle tracking. I found User FORTRAN can use for this one, but stuck on this stage. Do you have any idea on obtaining collection efficiency and grade efficiency curves? I am really tired of this. Many thanks for your helps.

 January 9, 2013, 05:45 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,831 Rep Power: 85 The solver should report particle fates by size group - it will tell you how many go out the outlet and how many got trapped. This sounds like what you need for a grade efficiency curve calculation.

 January 9, 2013, 09:27 #5 Senior Member   S.Bogoda Join Date: Jul 2012 Posts: 133 Rep Power: 5 Dear Glenn, Thanks a lot for the reply. I have done a simulations in CFX-tutorial to understand particle flow and to find particle mass fractions @ inlet and outlet. (All were steady state simulations) I found in output file, it gives only the mass fraction @ inlet and outlet. For example, in the tutorial "11. Flow through a Butterfly Valve" Particle diagnostics as follows, ================================================== ==================== Particle Diagnostics ================================================== ==================== +--------------------------------------------------------------------+ | Particle Mass Flow Summary | +--------------------------------------------------------------------+ Sand One Way Coupled Inlet 1.0000E-02 Outlet -1.0000E-02 Sand Fully Coupled Inlet 1.0000E-02 Outlet -1.0000E-02 +--------------------------------------------------------------------+ | Particle Momentum Flow Summary | +--------------------------------------------------------------------+ Sand One Way Coupled X-Comp. Y-Comp. Z-Comp. Inlet 0.0000E+00 0.0000E+00 4.1087E-02 Outlet 4.4985E-04 -1.9144E-03 -4.1069E-02 Sand Fully Coupled X-Comp. Y-Comp. Z-Comp. Inlet 0.0000E+00 0.0000E+00 4.0947E-02 Outlet 1.0488E-03 -4.4581E-03 -4.0543E-02 +--------------------------------------------------------------------+ | Particle Forces on Walls | +--------------------------------------------------------------------+ Sand One Way Coupled X-Comp. Y-Comp. Z-Comp. Default Domain Default -1.1786E-04 -3.2385E-03 3.0524E-03 pipe wall -1.4197E-02 -3.0213E-03 3.1836E-04 Sand Fully Coupled X-Comp. Y-Comp. Z-Comp. Default Domain Default -5.2943E-05 -4.0915E-03 3.7797E-03 pipe wall -1.2482E-02 -2.6480E-03 2.6313E-04 ----------------------------------------------------------------------- But in this tutorial it used poly dispersed sample, and only "mass flow" is given in output, no mass/diameter fractions. I know in this tutorial, all particles should be escape from outlet. My simulation is a cyclone separator (by LES) and still I haven't done simulation on that. Because I am thinking about how to view inlet and outlet grade efficiency considering these tutorial examples. Really appreciate your advises.

 January 12, 2013, 16:23 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,831 Rep Power: 85 Have a look at the documentation, for particle diagnostics. I think you have to enable this in the output tab in CFX-Pre.

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