# mixing index in cfx

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 April 17, 2013, 06:42 mixing index in cfx #1 Member   rasool Join Date: Apr 2013 Posts: 41 Rep Power: 5 hello i want calculate the mixing index of an active micro mixer with oscillating stirrer. i simulate this but for validat of my problem I need to calculat these D={(1/N)Σ[(Ci-Cmean)/Cmean]^2}^0.5 In this equation, N is the number of discretized points on the cross line for the channel, Cmean is the mean concentration at the inlet, and Ci is the local concentration at each cross section. please help me in details

 April 17, 2013, 08:06 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,726 Rep Power: 99 Sounds like a reasonably simple post processing operation. Set up your cross sections as planes or whatever they are, then write a CEL expression like (1/N)*[(massFlowAve(c)@Section 1-Cmean)/Cmean + (massFlowAve(c)@Section 2 -Cmean)/Cmean + .... + (massFlowAve(c)@Section N-Cmean)/Cmean].. etc....

 April 19, 2013, 03:28 #3 Member   rasool Join Date: Apr 2013 Posts: 41 Rep Power: 5 Hello my dear ghorrocks (ave{[(A1 Volume fraction - Cmean)/Cmean]^2}@outlet)0.5

 April 19, 2013, 06:12 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,726 Rep Power: 99 The AreaAve function is better than Ave as it is the area weighted average.

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