mixing index in cfx

rasool motamedi · April 17, 2013, 07:42

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

ghorrocks · April 17, 2013, 09:06

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....

rasool motamedi · April 19, 2013, 04:28

Hello my dear
ghorrocks
(ave{[(A1 Volume fraction - Cmean)/Cmean]^2}@outlet)0.5

ghorrocks · April 19, 2013, 07:12

The AreaAve function is better than Ave as it is the area weighted average.

April 17, 2013, 07:42	mixing index in cfx	#1
rasool motamedi Member rasool Join Date: Apr 2013 Posts: 41 Rep Power: 13	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

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April 17, 2013, 09:06		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	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, 04:28		#3
rasool motamedi Member rasool Join Date: Apr 2013 Posts: 41 Rep Power: 13	Hello my dear ghorrocks (ave{[(A1 Volume fraction - Cmean)/Cmean]^2}@outlet)0.5

April 19, 2013, 07:12		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	The AreaAve function is better than Ave as it is the area weighted average.