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-   -   Solid combustion problem.... (http://www.cfd-online.com/Forums/fluent/72417-solid-combustion-problem.html)

godspeedsam February 4, 2010 20:22

Solid combustion problem....
 
Hi,
I have a problem about solid combusiton. I am wondering if Fluent can deal with it or not. Here is the problem:

A diffusion flame exists over a solid fuel. The heat transfer between the diffusion flame and solid fuel should be considered. The solid fuel vapor is pyrolyzed (vaporized) from solid surface and the pyrolysis rate is a function of solid surface temperature. It can assmue that the degression of solid fuel surface can be ignored.

According to my trials on FRUENT, I can not set the fuel mass flux from "solid surface". Does anyone have comment on this or know what model I should use?

Thanks in advance.

Sam

coalgas February 15, 2010 18:39

hello,

Which multiphase model are you using to define your problem.
i guess, Euler-granular model will be helpful for your purpose.

To define pyrolysed species you need to define pseudo species from material panel, and then use Macro, DEFINE_MASS_TRANSFER to release pyrolysed products from pseudo species to gas (primary)phase.

i hope this will help you.

regards
Chetan

godspeedsam February 21, 2010 18:46

Thank you...
 
Thank you for your reply.
I will try the model and the Macro you suggested.

Currently, I use a pyrolysis layer over the solid surfcace, which is very thin, and set it as porous medium, so I can apply source Macros on the porous region. FYI.

Sam

Quote:

Originally Posted by coalgas (Post 246126)
hello,

Which multiphase model are you using to define your problem.
i guess, Euler-granular model will be helpful for your purpose.

To define pyrolysed species you need to define pseudo species from material panel, and then use Macro, DEFINE_MASS_TRANSFER to release pyrolysed products from pseudo species to gas (primary)phase.

i hope this will help you.

regards
Chetan



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