CFD Online Logo CFD Online URL
Home > Forums > FLUENT

How to calculate the mass fraction of species in Fluent?

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

LinkBack Thread Tools Display Modes
Old   May 21, 2010, 04:41
Default How to calculate the mass fraction of species in Fluent?
Join Date: Mar 2009
Posts: 54
Rep Power: 10
llrr is on a distinguished road
Hi everyone,

I am running a simulation in a room to see the NH3 concentration distribution. I know the emission surface concentration is A mg/m3. How should I calculate the NH3 mass fraction to define the boundary condition on the emission surface? I tried in this way, let's say ventilation rate is Q m3/s, density of air is R kg/m3, then the NH3 mass fraction on the emission surface is: A*1.0E-06*Q/(Q*R)? Is this correct?

After the simulation was finished, the result is far away from the measurement, so I checked the value of NH3 on the emission surface and it gave me totally different value of molar concentration of NH3. Anyone has this problem? Thanks a lot!

llrr is offline   Reply With Quote


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
species mass fraction in reacting flow ma Main CFD Forum 8 February 20, 2013 18:06
mass flow in is not equal to mass flow out saii CFX 2 September 18, 2009 08:07
Calculation of Mass Fraction Bikramjit FLUENT 1 January 21, 2008 04:41
mass balance of single species antonietta FLUENT 0 November 11, 2005 12:11
gradient of species mass fraction zhou FLUENT 0 March 3, 2004 23:55

All times are GMT -4. The time now is 05:21.