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 Özer AYDIN June 20, 2007 02:41

combustion of wood

hi,

A certain mass of that is a cylndirical combustion chamber. The whole volume of combustion chamber is filled with wood shaving.The combustion air is sent in the direction of the combustion chamber axis.Which models are chosen? (Especially, the values relation with wood shavings in order to amount of wood volatiles are decreased by combustion. Thanks

 Allan Walsh June 20, 2007 09:17

Re: combustion of wood

Why are you modeling this? If you answer that, you will be part of the way to your solution. Do you want temperatures, gas composition, wood burning rate? The first two can be done reasonably well in Fluent. For the last one, you would likely have to make your own model.

 Özer AYDIN June 20, 2007 10:06

combustion of wood

Hi,Thanks for the asking.I study on smoldering combustion. I have some experimental results. I want to compare these results with numerical solution. I want to temperatures, gas composition, wood burning rate. What is your advise for modelling smoldering combustion. Wood shaving is burnt in a fixed bed. Fixed bed is cylindircal and full of wood shaving. How should I introduce this fuel to Fluent

Thank you Allan

 Allan Walsh June 21, 2007 11:55

Re: combustion of wood

As a starting point, I would introduce the fuel from a surface representing the top of the fuel pile. Set a mass flux of water, volatiles (based on the fuel composition), and CO or CO2 from char combustion.

Then you need to add heat sink terms for water evaporated and heat source terms for char burned. And O2 sink terms for char combustion.

What are you trying to do? Model the combustion as a function of temperature, O2 concentration, and velocities (mass fluxes)? Of course, there is nothing built into Fluent to account for these things. You would have make your own stand-alone model or implement it into Fluent via a UDF. You would probably be looking at a year or two of work.

 Özer AYDIN June 25, 2007 03:11

Re: combustion of wood