How to define diffusivities in Fuel cell Model

February 17, 2007, 16:30

Hi, I am modeling PEMFC, and I am trying to define diffusivities for species. Species have different diffusivities in different zones. How do I use macro "DEFINE_DIFFUSIVITY" to define them in different zones? And how much are diffusivities of water and nitrogen? Who can give me an example? Thank you! braket

February 17, 2007, 18:08

In addition, I only find the diffusivities of oxygen, hydrogen in literatures, but water and nitrogen diffusivities can not be found. how do you define and input them in fuel cell model? Thank you very much!

February 17, 2007, 16:30	How to define diffusivities in Fuel cell Model	#1
braket Guest Posts: n/a	Hi, I am modeling PEMFC, and I am trying to define diffusivities for species. Species have different diffusivities in different zones. How do I use macro "DEFINE_DIFFUSIVITY" to define them in different zones? And how much are diffusivities of water and nitrogen? Who can give me an example? Thank you! braket

February 17, 2007, 18:08	Re: How to define diffusivities in Fuel cell Model	#2
braket Guest Posts: n/a	In addition, I only find the diffusivities of oxygen, hydrogen in literatures, but water and nitrogen diffusivities can not be found. how do you define and input them in fuel cell model? Thank you very much!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Superlinear speedup in OpenFOAM 13	msrinath80	OpenFOAM Running, Solving & CFD	18	March 3, 2015 05:36
neighboring cell in VOF model	stulle	Fluent UDF and Scheme Programming	1	January 5, 2011 09:27
Missing math.h header	Travis	FLUENT	4	January 15, 2009 11:48
UDF FOR UNSTEADY TIME STEP	mayur	FLUENT	3	August 9, 2006 10:19
[Commercial meshers] Trimmed cell and embedded refinement mesh conversion issues	michele	OpenFOAM Meshing & Mesh Conversion	2	July 15, 2005 04:15