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getting a warning about mass imbalance in reaction

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Old   February 24, 2006, 17:26
Default getting a warning about mass imbalance in reaction
  #1
lily
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I just finished looking for reaction mechanisms and was happy to really start using fluent to model. but i kept on getting the warning saying like this:"Warning: mass imbalance in reaction-1 stoichiometry." Is this normal? I cannot figure out why the reaction stoichiometry is imbalanced. Can anyone help me out here? Thanks a lot in advance.
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Old   February 24, 2006, 18:04
Default Re: getting a warning about mass imbalance in reac
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Allan Walsh
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I guess your reaction is not balanced. Check the molecular weights and stoichiometric coefficients for the reactants and products. I'm not sure how good the balance has to be, but 99%+ seems to work.
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Old   February 25, 2006, 01:15
Default Re: getting a warning about mass imbalance in reac
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lily
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thanks Allan. the reaction is as simple as c2cl4->c2cl3+cl so the stoichiometric coefficients are fine(i suppose), the molecular weight for the species are 165.83,130.38 and 35.45 respectively. but i am still getting the warning. (
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Old   February 26, 2006, 01:30
Default Re: getting a warning about mass imbalance in reac
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Ashish Jain
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Hi Lily,

Fluent gives this warning, when the mass of two sides doesnt match. I assume u have defined volumetric kind of reaction, check u have specified correct S.F for both reactant and products and u have selected the right species from the dropdown menu.

Also check when u have defined ur species, u have assigned them correct molecular weights. I hope this will solve ur problem.

Ashish
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Old   February 26, 2006, 09:37
Default Ashish, could you specify what is the s.f?
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lily
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Thanks, Ashish. yes, i defined volumetric reaction, i checked carefully the molecular weights of the species of the reactants and products, the reaction is as simple as c2cl4->c2cl3+cl so the stoichiometric coefficients are fine(i suppose), the molecular weight for the species are 165.83,130.38 and 35.45 respectively. but i am still getting the warning. (

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