How to put infinity reaction rate in the program?
Hi: Now I am trying to solve following problem: One species(A) is on the calculated domain, and another species (B) comes in( velocity field has been solved). There is reaction between A and B and this reaction is a fast reaction(which means A and B can not coexist at same location at given time: either concentraion of A or concentration of B has to be zero at one location). I tried to put a source term in the governing equations(mass transfer equation), but I failed. Does anybody have an idea how to solve this kind problem?
Thank you Lu 
Re: How to put infinity reaction rate in the program?
Equilibrium.

Re: How to put infinity reaction rate in the program?
Yes, I agree with Andy. Infinite reaction rates mean the flow is in equilibrium. Zero reaction rates mean the flow is nonreacting or frozen. Finite reaction rates mean the flow is reacting. For more information, please read Dr. John Anderson's compressible fluid dynamics book. I think Dr. Anderson is now available at University of Maryland, College Park in the Department of Mechanical or Aerospace Engineering.

Re: How to put infinity reaction rate in the program?
Hi: Thanks a lot for your help. Could you tell more about the book: compressible fluid dynamics. The only book I can find from Dr. John Anderson is: Computational Fluid Dynamics: The Basics with Applications.
Thank you. Lu 
Re: How to put infinity reaction rate in the program?
Anderson, J. D., Jr., Modern Compressible Flow, 2nd ed., McGrawHill Publishing Company,1990, New York,pp. 510643.
Dr. Anderson has great contribution in the development of the Time Marching Technique algorithm for analyzing chemically nonequilibrium nozzle flows through rocket nozzles. For my master's thesis, I was working to develop a better approach and named it the 'Space Marching Technique' which is simpler and converges faster than the traditional Time Marching Technique for onedimensional chemically nonequilibrium nozzle flows. Please note that this book may have latest publications say may be 3rd. or 4th. edition. Dr. Anderson is probably the President or the Vicepresident of AIAA Journal Publications. The Chief editor of AIAA Journal is from University of Michigan, Ann Arbor. 
Re: How to put infinity reaction rate in the program?
Dr. Anderson is retiring from his professor position at Maryland. You may also want to check out his "Hypersonic and High Temperature Gas Dynamics" book. It goes into even more detail than his compressible flow book and, as usual, is very well written.

Re: How to put infinity reaction rate in the program?
Thank you for the information of the book. I will try to get hold of the book you have mentioned through library.

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