×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Modeling CSTR in series for a membrane reactor: MATLAB

Modeling CSTR in series for a membrane reactor: MATLAB

Modeling CSTR in series for a membrane reactor: MATLAB

(OP)
Dear all,

I'm new to modelling in Matlab, and am trying to model a hollow fibre membrane separating water and BSA using the tank in series model.
For this, I have determined that the number of CSTRs (found to be 44 through tracer experiments) that represent the membrane.
Now I am having difficulties inputing the ODE for the water balance.

The following assumptions are made:
- BSA and water enter the feed
- ONLY water permeates through the membrane
- the retentate stream has BSA and water.

For the water balance, I simply have:
dn/dt = Fw,in - Fw,out - J*A

where Fw,in and Fw,out are the molar flow of water [mol/s] in and out of the CSTR, J is the flux [mol/s*m2] and A the surface area of the membrane.
However, when I input this as an ode45 into matlab, matlab processes the equation as dFw/dt rather than dn/dt.

Therefore, how do format my water balance so that the inlet and outlet variable that are changing are in mol rather than mol/s?

RE: Modeling CSTR in series for a membrane reactor: MATLAB

There is a "Engineering Computer Programs" forum on this website that might be a better place for this question. If you plan to post there as well, please report this post for deletion so it's not a duplicate.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close