# help in using permeability coefficeint

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 February 29, 2004, 07:02 help in using permeability coefficeint #1 michele Guest   Posts: n/a In order to finalize my last test at university of florence as mechanical engineer, i'd like help for the following scope: simulation of a vacuum steam condenser consisting of A-roof finned boundle by using Star-CD. My question is how to simulate a finned tube bank airside pressure drop as calculated by Robinson and Briggs formula. In particular my interest is in finding, in the right way, alpha and beta coefficient for Star-CD. yours friendly, Michele

 March 5, 2004, 10:27 Re: help in using permeability coefficeint #2 isidro Guest   Posts: n/a hi, this is what I used to calculate the pressure drop through a porous medium: dP/L=alpha*v^2+beta*v, L being the thickness of the porous region. my advise is for you to get some experimental data and try to curvefit this pressure drop using this formula. good luck, isidro

 March 27, 2004, 13:34 Re: help in using permeability coefficeint #3 michele Guest   Posts: n/a hi,thanking for your indication.i have found the following: dP/L=alpha*v^2+beta*v= 5,6. is in your opinion this result acceptable according to your experience? yours friendly michele

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