×
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

saft gamma mie parameters

saft gamma mie parameters

saft gamma mie parameters

(OP)
Hi,

I'm new to the forum and I have a few questions.

I am trying to understand SAFT-gamma-Mie methodology based on the following papers:
1. T. Lafitte et al. "Accurate statistical associating fluid theory for chain molecules formed from Mie segments"
2. V. Papaioannou et al. "Group contribution methodology based on the statistical associating fluid theory for theteronuclear molecules formed from Mie segments"

I am confused in the usage of terms 'segment', 'group' and 'components'.

Taking ethanol as an example,
In ideal term for Helmholtz energy, is it considered as free energy due to non-interacting, ideal segments of the molecule (ie, is it the free energy of ideal CH3, CH2 and OH spherical segments?) or non-interacting, ideal molecules (non-interacting CH3CH2OH)?

So, in the ideal term, is the mole fraction that for of ethanol in a mixture of molecules of ethanol (That is 1 right😵?) or is it sum of mole fractions of CH3 , CH2 and OH groups in ethanol?
Similarly, is the volume considered the volume of CH3CH2OH molecule or that for the whole system of ethanol (is it taken as 1 mole)?

There are NC and NG terms in AHS in the monomer free energy contribution.


Any help is greatly appreciated.

Thank you

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