Learning Forum

[chemQ]

I am using Chmkin software.nI'm using PSR, and I'm curious about the exact meaning of the Initial gas fraction.nI think the exact meaning of the initial gas fraction will be divided into two.nnThe first is that the gas fraction value when not mixed with other gases is entered in the 'Initial gas fraction' column. If only N2 and O2 enter the chamber, the initial gas fraction of N2 and O2 is 1 respectively. But through nomalize, it becomes 0.5 and 0.5 respectively.nnThe second is that the equilibrium gas fraction value after the reaction occurs by mixing with other gas is entered in the 'Initial gas fraction' column. If only N2 and O2 go into the chamber, the value after N2 and O2 react and equilibrate like N2-0.4, O2-0.4, and NO-0.1 (example) should be entered in the 'Initial gas fraction' column. n*The amount of reactant is determined in the 'reactant fraction' column. The initial gas fraction cannot be the quantity of reactants.nWhich one is right?n

[wcao]

Hi, your first assumption is correct. Chemkin is solving differential equations so that it needs a initial condition. For PSR (perfectly stirred reactor), it will be an ODE so that the initial conditions, including the initial gas species fractions will be necessary. Thanks.n

[chemQ]

Hi, your first assumption is correct. Chemkin is solving differential equations so that it needs a initial condition. For PSR (perfectly stirred reactor), it will be an ODE so that the initial conditions, including the initial gas species fractions will be necessary. Thanks./forum/discussion/comment/98950#Comment_98950

I used 'quote' because I don't know how to reply back to your comment. Thanks for your answer.n

[chemQ]

Hi, your first assumption is correct. Chemkin is solving differential equations so that it needs a initial condition. For PSR (perfectly stirred reactor), it will be an ODE so that the initial conditions, including the initial gas species fractions will be necessary. Thanks./forum/discussion/comment/98950#Comment_98950

Excuse me. I read the Theory manual for more information after seeing your answer. However, it seems that this manual states that ODE is used in the combustion reaction. But I use plasma reaction. Is it the same for plasma reactions?nI used 'quote' because I don't know how to get the answer. Thank you.n