Chemistry reactions in CFX

visitor · January 28, 2020, 06:36

I have run a chemistry reaction by entering a balanced chemistry reaction. As usual entering reactants and products. Run ok, but I have a question.

How are reaction rates considered in CFX? If SO2 + H2O = H2SO3 for an example. Does CFX automatically cater for reaction times?

Similarly for Carboxylic forming, CO2 + H2O=H2CO3, which is unstable and will break down. How can CFX address this breakdown? Breaking down into CO3 + H.

How to consider reaction time issues in CFX?

THANKS

Opaque · January 28, 2020, 08:47

Not sure what you are asking.

CFX only evaluates the reactions given in the input file, say

CO2 + H2O = H2CO3

The input should include
- the materials on the reactants side: CO2, H2O
- the materials on the products side: H2CO3
- Reaction rate information for this reaction: coefficients and forward/backward descriptions

it is the user/our responsibility to describe the reaction mechanism, and intermediate steps if any.

Hope the above helps,

January 28, 2020, 06:36	Chemistry reactions in CFX	#1
visitor Senior Member AH Join Date: Apr 2014 Posts: 282 Rep Power: 13	I have run a chemistry reaction by entering a balanced chemistry reaction. As usual entering reactants and products. Run ok, but I have a question. How are reaction rates considered in CFX? If SO2 + H2O = H2SO3 for an example. Does CFX automatically cater for reaction times? Similarly for Carboxylic forming, CO2 + H2O=H2CO3, which is unstable and will break down. How can CFX address this breakdown? Breaking down into CO3 + H. How to consider reaction time issues in CFX? THANKS

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January 28, 2020, 08:47		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,804 Rep Power: 32	Not sure what you are asking. CFX only evaluates the reactions given in the input file, say CO2 + H2O = H2CO3 The input should include - the materials on the reactants side: CO2, H2O - the materials on the products side: H2CO3 - Reaction rate information for this reaction: coefficients and forward/backward descriptions it is the user/our responsibility to describe the reaction mechanism, and intermediate steps if any. Hope the above helps,