soot consuming rate in diesel particulate filter

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  • Last Post 02 January 2019
Weiqiang Liu posted this 01 January 2019

hi all,

I am doing a simulation of diesel particulate filter regeneration, namely soot combustion trapped in the filter. 

The soot exists in the filter in two formats. The first one is soot cake which itself is porous media. The soot cake is not in contact with catalyst whose combustion is called slow oxidation. while the soot in the porous filter wall is in contact with catalyst whose combustion is called fast oxidation.

The computation domain in the paper I am trying to reproduce is as follows:

what confuses me is a description in the paper 'in the porous wall of the filter, both contributions of slow and fast oxidation were implemented . in the cake, only the slow oxidation was implemented'

Does this mean the soot consuming rate in the porous wall of the filter is the summation of slow oxidation and fast oxidation? I am wondering is this right? I believe the soot oxidation rate in the porous wall is merely fast oxidation rate.

please help.

thanks

weiqiang

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rwoolhou posted this 02 January 2019

I'm not sure without seeing the paper: if there's a copyright online copy please share a link, but please don't attach it to here. 

My assumption is that the cake isn't close enough to the catalyst to get the benefit so oxidises slowly. In the catalyst region (which will also be a porous region) soot can oxidise with both catalysed and uncatalysed mechanisms. 

Weiqiang Liu posted this 02 January 2019

hello, 

Below is the link of this paper.

https://www.sciencedirect.com/science/article/pii/S0009250915004194

I can not really understand the statement 'both the slow and fast oxidation of soot were implement in porous wall'. Does it mean the oxidation rate of soot in catalytic porous media is the summation of slow and fast oxidation?

thanks very much!

I really appreciate your help

weiqiang

 

 

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