# how to model dimensionless channel?

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 March 25, 2013, 06:59 how to model dimensionless channel? #1 Member   shahrbanoo Join Date: Mar 2013 Posts: 63 Rep Power: 6 Hello… I have an article and this article evaluated a channel with ribs on it’s walls. I want to model this channel In Gambit and work on it, but all of the data in the article is dimensionless. What should I do? Can I guess?

 March 25, 2013, 08:27 #2 Senior Member   Andrew Join Date: Mar 2009 Location: Washington, DC Posts: 195 Rep Power: 10 I would think that if they mentioned a Reynolds number you could back out a dimension and go from there.

 March 25, 2013, 09:10 #3 Member   shahrbanoo Join Date: Mar 2013 Posts: 63 Rep Power: 6 it's natuaral convection and Rayleigh number is used, but I don't have temperature difference to calculate channel width!

 March 25, 2013, 09:14 #4 Senior Member   Andrew Join Date: Mar 2009 Location: Washington, DC Posts: 195 Rep Power: 10 Just pick a length and go. You should have something like l/L =.9.. pick a l and get a L

 March 25, 2013, 09:59 #5 Senior Member   Join Date: Dec 2011 Location: Madrid, Spain Posts: 134 Rep Power: 8 Hi, I think the characteristic length (L) usually taken to non-dimensionalize the equations for channel flow is the half-width of the channel. Then you have to non-dimensionalize all the geometrical features with this characteristic length (ribs, etc.). You will have to solve the equations in dimensionless form. Given the characteristic length, the Rayleigh number and the fluid properties you can impose the temperature difference by setting the upper wall temperature to 0 and the temperature of the lower wall to . Wait for other replies. Cheers, Michujo.

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