Free Radical Polymerization

andon6141 · July 31, 2015, 11:12

Hello,

i have a problem with the modeling of a free radical polymerisation reactor.

Here the underlying kinetics:

Initiator ----> 2 * Radical (1)

Radical + Monomer ----> Radical (2)

Radical + Radical ----> Polymer (3)

The Problem is the equation number 2. Radical reacts with a monomer to form a new radical. Solving such an equation is Fluent is because of mass imbalance impossible.

Is there a trick .... perhaps with a UDF or something ?

TallesC · August 20, 2015, 08:16

Hello, I am having the same problem but only with a more complex kinetic reactions with 31 and 24 radicals and molecular components, I'm trying to implement in ansys CFX, but always appears overflow error ... you could implement the model?

July 31, 2015, 11:12	Free Radical Polymerization	#1
andon6141 New Member Anton Hilfer Join Date: Dec 2014 Posts: 7 Rep Power: 11	Hello, i have a problem with the modeling of a free radical polymerisation reactor. Here the underlying kinetics: Initiator ----> 2 * Radical (1) Radical + Monomer ----> Radical (2) Radical + Radical ----> Polymer (3) The Problem is the equation number 2. Radical reacts with a monomer to form a new radical. Solving such an equation is Fluent is because of mass imbalance impossible. Is there a trick .... perhaps with a UDF or something ?

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August 20, 2015, 08:16		#2
TallesC Senior Member Talles Caio Join Date: Oct 2012 Location: Brazil Posts: 101 Rep Power: 13	Hello, I am having the same problem but only with a more complex kinetic reactions with 31 and 24 radicals and molecular components, I'm trying to implement in ansys CFX, but always appears overflow error ... you could implement the model?