×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Condensing Heat Transfer Coefficient

Condensing Heat Transfer Coefficient

Condensing Heat Transfer Coefficient

(OP)
Hi,

I am designing a small condenser to remove aviation fuel vapours (internal to the tube) from a small gas flow. Could someone please tell me if the attached calculation approach is correct for a vertical tube condenser under laminar flow conditions where the condensation process is inside the tube?

Very Best Regards,

Aerospace35  

RE: Condensing Heat Transfer Coefficient

I didn't check the math, but the method is sound.  This is about 100 Btu/lb/ft2/oF.  Kind of low, but this is Nusselt theory and NRe is low.  You might want to check using the Dukler Plot, if nothing else it'll be a good cross check.

Good luck,
Latexman

RE: Condensing Heat Transfer Coefficient

Sorry.  Change lb to hr.

Good luck,
Latexman

RE: Condensing Heat Transfer Coefficient

(OP)
Many Thanks Latexman - do you know where I might find the Dukler plots to make this comparison.

Regards,

Aerospace35

RE: Condensing Heat Transfer Coefficient

It's documented in Perry's Chemical Engineers' Handbook.  It may be in other heat transfer textbooks, but thats where I look it up.

Good luck,
Latexman

RE: Condensing Heat Transfer Coefficient

Do you need to include ID or OD fouling fctors ?

RE: Condensing Heat Transfer Coefficient

Good point.  The OP has calculated hi, but U is needed to design a complete unit.

Good luck,
Latexman

RE: Condensing Heat Transfer Coefficient

(OP)
Hi,

Checked my value via the Dukler plot and it gave an answer in the 115 to 120 Btu/hr/ft2/oF - so it's in the ballpark. Conversion to SI units as per my calc is * 5.687. What a helpful diagram - so much must have gone into working that little lot out!
I wasn't so sure on the Dukler plot what deltaT represented on the right handside L*deltaT column.I reasoned it was the temperature between the wall of the condenser and the vapour going through it - Any views anyone?

Thanks to all for your views and answers on this - been v.helpful.

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!


Resources