# Combustion of wood

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 November 10, 2004, 06:36 Combustion of wood #1 Simon Steinmeyer Guest   Posts: n/a Hello, I would like to simulate a combustion process of wood: I have definied the simplified mixture in prePDF and would like to inject the fuel as a non-premixed combustion. But I can't choose "prepdf-mixture" in the injection panel. How can I inject the fuel? In the "Boundary Conditions"-Panel, I can't find a suitable option, too. Thanks, Simon Steinmeyer

 November 10, 2004, 18:53 Re: Combustion of wood #2 Ryan Guest   Posts: n/a To do a particle injection using the prepdf model, set the particle type to combisting-particle. The devolatilization kinteics and fixed carbon can then be changed in the combusting particle materials panel. To inject the fuel through a boundary condition (such as a velocity inlet), set the mixture fraction variable to 1. Use of a velocity inlet in this manner is generally used for gaseous fuels. Ryan

 November 11, 2004, 05:26 Re: Combustion of wood #3 Simon Steinmeyer Guest   Posts: n/a Thanks, that helped a lot.

 August 4, 2011, 08:26 #4 New Member   Join Date: Aug 2009 Posts: 5 Rep Power: 9 Hello Simon. I am working with Fluent to simulate the combustion of wood particles (edge ​​length: 8mm). I use the following models: Energy on, Viscous SST k-omega, DO Radiation and species non-premixed combustion. The wood particle is defined as a porous media and the porosity is changing with increasing temperature. This is done by an udf. The problem is that the particle does not heat up when I am working with the non-premixed model. My oxidizer comes with 1293 K as nitrogen and oxygen in the combustion chamber and the fuel (volatiles and co) is released as a function of temperature in the particle via udf. But the temperature in the particle doesn't increase. Does the non-premixed-combustion model not include conduction? Thanks in advance for your efforts. Maria

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