Source (multi-step chemical reaction)

Laexzzz · February 15, 2014, 07:24

Hello!
I have a question about UDF for chemical reaction modelling

Scheme of my reaction:

dA/dt = -k1*A[t]
dB/dt = -k2*R(0)[t]*B[t]-k2*Mm0[t]*B[t]
dR(0)/dt = k1*A[t]-k2*R(0)[t]*B[t]
dMM0/dt = k2*R(0)[t]*B[t]

dA/dt, dB/dt, dR(0)/dt, dMM0/dt is the change of components concentrations in time.
A[t], B[t], R(0)[t], Mm0[t] - concentration of the component at time t
k1 k2 is reaction rate constant

Components A and B are continuously received in the tube.

Next I will need to know the concentration of each component at the tube

How can I solve this system of differential equations?
What UDF should I use?
Define_source and DEFINE_UDS_UNSTEADY?

Thank you in advance

Sara28 · July 1, 2015, 02:16

Hello,

did you solve the Problem? Could you please explain how? It could be helpful for my task. Please contact me.

February 15, 2014, 07:24	Source (multi-step chemical reaction)	#1
Laexzzz New Member Alexey Join Date: Jan 2014 Posts: 18 Rep Power: 12	Hello! I have a question about UDF for chemical reaction modelling Scheme of my reaction: dA/dt = -k1A[t] dB/dt = -k2R(0)[t]B[t]-k2Mm0[t]B[t] dR(0)/dt = k1A[t]-k2R(0)[t]B[t] dMM0/dt = k2R(0)[t]B[t] dA/dt, dB/dt, dR(0)/dt, dMM0/dt is the change of components concentrations in time. A[t], B[t], R(0)[t], Mm0[t] - concentration of the component at time t k1 k2 is reaction rate constant Components A and B are continuously received in the tube. Next I will need to know the concentration of each component at the tube How can I solve this system of differential equations? What UDF should I use? Define_source and DEFINE_UDS_UNSTEADY? Thank you in advance

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July 1, 2015, 02:16		#2
Sara28 New Member Join Date: May 2015 Location: Germany Posts: 15 Rep Power: 10	Hello, did you solve the Problem? Could you please explain how? It could be helpful for my task. Please contact me.