help in using permeability coefficeint
 

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

Re: help in using permeability coefficeint
 

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

Re: help in using permeability coefficeint
 

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