# Nusselt number

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 March 23, 2012, 06:31 Nusselt number #1 Member   Join Date: Aug 2011 Posts: 53 Rep Power: 7 can anyone suggest me how to calculate the nusselt number from results? I have a duct with L/D = 62 , ReD = 8100, all walls at constant heat flux. I want to cross check my results with Dittus- Boelter equation. pl. do reply

 March 25, 2012, 06:28 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,832 Rep Power: 100 Define a variable in CFD-Post with the equation for Nussult number. Then you can use this variable as a normal results file variable -you can plot it, get min/max, integrate it, graph it against something etc etc

 March 27, 2012, 09:45 how to create variable Nussult no in cfd post #3 New Member   pritam gole Join Date: Oct 2011 Posts: 3 Rep Power: 7 i tried but not succeded in creating this varible with formula....... please help

 March 27, 2012, 10:55 #4 Member   Join Date: Aug 2011 Posts: 53 Rep Power: 7 how did u try pritam? what is your formula?

 March 27, 2012, 15:06 #5 Member   Luis Filipe Fabiani Join Date: Apr 2009 Posts: 43 Rep Power: 9 On CFD-POST first create an expression Example: sqrt(Velocity w^2) and name it ("nusselt", "my expression", or whatever) Then on variables, create a new variable (also name it as you wish) and point the "expression" field to the expression you just created.

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