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6-Contributor
December 15, 2022
Solved

ODESOLVE

  • December 15, 2022
  • 2 replies
  • 3539 views

Hi everyone,

 

As a chemical engineering student, I am trying to solve a pipeloop problem. 

 

I stated all the necessary balances (see below):

TW_9638511_0-1671100207133.png

And the other necessary formulas:

TW_9638511_1-1671100249597.png

which I want to solve for Fh(v),Fo(v) and Fc(v) from v=0 until v=VL.

 

now I've set up this solve block:

 

TW_9638511_3-1671100487991.png

 

which in theory seems solvable, as there are 5 unknowns and 5 equations.

 

Is this the correct way to solve this problem?

 

With kind regards,

 

Tim

                    

Best answer by Werner_E

You have a couple of errors.

The functions you are looking for are functions in just one variable (v) but you sometimes used them as if they were functions in three variables.

Sometimes you simply wrote F.C (as if it were a simple variable) instead of F.C(...)

In the IC you had a typo and wrote C.CL twice and were missing C.OL

You have to solve for ALL unknown functions even if you are not interested in C.CL and C.OL

This should help (worksheet attached):

Werner_E_0-1671116666860.png

 

2 replies

6-Contributor
December 15, 2022

When I try to solve it within the solveblock:

 

TW_9638511_2-1671105284785.png

 

I get the following error:

 

TW_9638511_0-1671105192332.png

 

Werner_E25-Diamond IAnswer
25-Diamond I
December 15, 2022

You have a couple of errors.

The functions you are looking for are functions in just one variable (v) but you sometimes used them as if they were functions in three variables.

Sometimes you simply wrote F.C (as if it were a simple variable) instead of F.C(...)

In the IC you had a typo and wrote C.CL twice and were missing C.OL

You have to solve for ALL unknown functions even if you are not interested in C.CL and C.OL

This should help (worksheet attached):

Werner_E_0-1671116666860.png

 

6-Contributor
December 15, 2022

Thanks a lot! This really Really appreciate the help!