CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

mass transfer coefficient for boundary condition

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

LinkBack Thread Tools Display Modes
Old   March 29, 2011, 05:33
Default mass transfer coefficient for boundary condition
New Member
Join Date: Mar 2011
Posts: 1
Rep Power: 0
niek is on a distinguished road
I'm struggling with the boundary condition for the oxygen mass transfer in a model for char particle combustion.

There is a boundary condition at the edge of the particle of the form:
D*(dYO2/dr) = km*[YO2,surroundings-YO2,edge]

In which D is the diffusion coefficient, km the mass transfer coefficient and YO2 the oxygen mass fraction.

I wonder how you calculate the mass transfer coefficient and what the value of this mass transfer coefficient is approximately.

I ask this because in my model, the reaction is limited due to a lack of oxygen. The amount of oxygen is that low, since the mass transfer of oxygen through the boundary is very limited. I use a mass transfer coefficient of 0.04 [m/sec] for a spherical particle with a diameter of 1 mm.

I hope you can answer my question or knows where I can find more information.

niek 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
About phase change heat and mass transfer Michael FLUENT 2 February 13, 2011 02:49
Multiphase Multicomponent mass transfer -Initial condition pannsave CFX 10 February 9, 2011 02:12
mass transfer coefficient fluent user FLUENT 0 September 13, 2008 06:19
free convective and diffusive mass transfer rajani FLUENT 0 July 27, 2005 08:28
Vof, udf and mass transfer panel Jay FLUENT 1 March 15, 2005 01:29

All times are GMT -4. The time now is 09:31.