×
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

Heat Exchangers Mathematical Model

Heat Exchangers Mathematical Model

Heat Exchangers Mathematical Model

(OP)
I derived the nusselt number for a square-shaped duct which is isolated on one side. Considerations I´ve taken into account are: Hydrodynamic - thermal fully developed regimen, Hahagen-poiseuille velocity profile, all properties are constants. Unfortunately I haven´t other result which I can compare with. So I would like to know if anyone out there has worked out the nusselt´s number for this special case?.  

RE: Heat Exchangers Mathematical Model

My best guess is:
The Nusselt number must include a shape factor,
for a standard rectangular parallelepiped shape
the equation is =
(1/Lx squared)+((1/Ly squared)+(1/Lz squared)
divided by
(1/Lx)+((1/Ly)+(1/Lz)
where:
  Lx = side one (height)
  Ly = side two (width)
  Lz = length (length)
For your case:
the factor must be reduced by one fourth
representative of the one side that is
isolated on one side.

see:http://kramerslab.tn.tudelft.nl/MSP-publications/WS_key...
 
  When you indicate " isolated on one side" is that
the height or an end cap position ?
                         wilg

RE: Heat Exchangers Mathematical Model

(OP)
Dear Wilg,
About the isolated side, I meant to refer to the height, sorry for not having specified it clearer.
On the other hand, thank´s for your the paper you provided me.

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