CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

Combusting Particles

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   July 20, 2007, 00:28
Default Combusting Particles
  #1
Ivy
Guest
 
Posts: n/a
Dear FLUENT users,

I am modeling solid particles combustion with FLUENT. Under materials panel, for the combusting particles, there are places for these 2 inputs: (1) Burnout Stochiometric ratio (2) Heat of reaction for burnout

In the user's guide, 'Burnout Stoichiometric ratio' is explained as mass of oxidant needed per mass of char; which will mean I will get the same 2.67 value for all types of coal or solids that undergone this reaction: char + O2 --> CO2, where char = C<s> material in FLUENT.

Similarly, for 'Heat of reaction for burnout', it is the heat released by surface char combustion reaction, i.e. the heat released per unit mass of char consumed in the reaction; so if I have this equation C<s> + O2 --> CO2 for different types of coal or solids, I will get the same value of 3.935e+08, i.e. the heat of reaction of C<s> + O2 -->CO2.

In short, no matter what solid I use, as long as the char reaction is C<s> + O2 --> CO2 , I will always get (1) as 2.67 and (2) as 3.935e+08. Does this really make sense? I suspect I'm wrong somewhere...can someone please help me?

Many thanks.
  Reply With Quote

Old   September 7, 2015, 08:11
Default
  #2
New Member
 
Saurav Chakraborty
Join Date: Sep 2013
Posts: 5
Rep Power: 4
srv1406 is on a distinguished road
That is true..

And what about the % heat fraction absorbed by solid
srv1406 is offline   Reply With Quote

Old   September 7, 2015, 10:00
Question Viscosity
  #3
New Member
 
Join Date: Aug 2015
Posts: 7
Rep Power: 2
Simona is on a distinguished road
Hello guys!!! i also have some problems with the non newtonian power law.
First of all i have to specify that I m a beginner in fluent.
I have a Pipe with non Newtonian fluid inside i do not have the lenght of my geometry but my fluid is fully developed (that means that the pipe should be pretty long to have this condition right?)
Well i draw my geometry and than i start to use fluent whe i define material and i put "water-liquid" than i select "viscosity-> Non newtonian power law" and then i should have minimun and maximum viscosity, but i don't, and i really don't know which kind of values i have to put and in which way i can ceck if they will be correct or not?Can you help me please? Thanks.
Simona is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Particles are not hitting the wall CedricVH OpenFOAM Bugs 21 June 2, 2015 04:33
trying to simulate two-phase jet flow with particles in surface injection ajkratos FLUENT 5 March 3, 2015 22:33
Combusting particles model with more than one product Ekiguy FLUENT 0 July 6, 2010 15:27
particles model ati_ros61 FLOW-3D 3 December 6, 2009 17:03
how to determine the number of particles injected. welch FLUENT 1 November 1, 2005 06:11


All times are GMT -4. The time now is 07:30.