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M
mnori1-Visitor
1-Visitor
July 6, 2015
Question

Solve Non-linear System - EOS Critical Conditions

  • July 6, 2015
  • 2 replies
  • 1262 views


Dear All,

I would like to receive clarifications about the solution of a nonlinear system through the use of a solve block Given/Find. In the attachment it is reported the  system that make use of the symbolic derivative operators ( EOS isothermal inflection point- critical conditions ) . The solution converges only up to a certain value of the input parameter ( epsaa, Vaa ).  Any suggestion how to solve this issue?

Your sincerely,

Massimiliano

2 replies

L
LucMeekes23-Emerald IV
23-Emerald IV
July 6, 2015

You're trying to solve the system for T=Tc. See what that does to the value of the Covolume Soft-core parameter:

You may get a division by zero.

Further:

I tried to solve the set symbolically (with part of the parameters defined)

and after 30 minutes it found no answer.

Hope this helps.

Success!
Luc

M
mnori1-VisitorAuthor
1-Visitor
November 9, 2015

Hello Luc,

The system has three unknowns ( εc,η  and bc ) in three equations. As shown in attachment, the Solve Block is solved only up to a certain value of εaa and Vaa ( EOS parameters ).
  The equation you considered added a further variable : b. 
 
 
 
 
 
 
 
 
 
 
 





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