[sarah l]

hello every body!
I am working on a project about heat transfer in packed bed of spheres, and my problem is why can I modeling it to fluent because we have heat generation in each of spheres!

[zdeth]

Sarah, have you figured this out yet? I'm trying to model ~heat exchangers in the porous media, I'd like to get a fixed temp. of the 'media'

[sarah l]

no yet, I'm doing on a kind of reactor !
fixed temp! so It is good to modeling, it is steady state and the bounary condition is determinded.

[manohar]

even my problem is very similar with your ones..my aim is to calculate the pressue drop when a fluid flows through porous zone..i have given the values of inertial resistance and viscous resistance also ..i got the answer of 2.5e+4 pressure drop with porosity 1..but i want the pressure drop at porosity 0.5 ..if i give the porosity as 0.5..i m getting the same pressure drop..i have written the udf also ..still i m not getting the correct answer for different values of porosity except at 1..can any 1 pls answer my problem..thanks in advance

[coalgas]

Hello Everyone,
anyone did tried Euler Granular approach?? as it offers treatment to two different phases rather than Porous formulation.

[mehulkumar]

Hi.. Manohar,

Please check the equation to calculate pressure drop !!
Also refer the momentum eqn with porosity for the question of porosity.

Mail me if still not got any hint.

Regards,

Mehulkumar
patel.mehulkumar.l@gmail.com

[neilduffy1024]

Manohar,

The inertial and viscous resistances are not actually linked to the porosity, well in Fluents eyes anyhow. I'm not fully sure I understand what you are doing but if the porosity is constant throughout the simulation, you just have to enter resistances specific to each porosity. I am not very familiar with flow through a porous medium but I think that a linear relationship is a common assumption, i.e. resistance directly proportional to porosity.

If your porosity is being changed during the simulation, which requires a DEFINE_PROFILE UDF, then simply store the porosity in user-defined memory (UDM) and write a second DEFINE_PROFILE UDF for your resistances which calls the porosity you just stored. This way you can link resistance and porosity.

Neil