×
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

Oil Cooling

Oil Cooling

Oil Cooling

(OP)
Hello

Hope somebody could give me an good piece of advice.
Following is the topic.
I have to design an heat exchanger to cool oil temperature.
My problem is choosing which correlation utilizing for calculating pressure drop and convective heat transfer coefficient.
Because of large viscosity variation with temperature I suppose I can't utilize traditional correlations utilized for water.
Please, which is your experience ? Would you be so kind and recommending me some reference literature where I can find an example of calculation ?

Many thanks
 

RE: Oil Cooling

reference literature . . .

try:  http://web.mit.edu/lienhard/www/ahtt.html

i highly recommend contacting a heat exchanger mfg for further guidance.

if the inlet/outlet conditions and fluids for both streams are known, then the heat exchanger mfg can conduct the analysis and design for you.  something to ponder . . . why re-invent the wheel yourself?

hope this helps.
-pmover

RE: Oil Cooling

How accurate do you want to be and what is the nature of the oil?

If you are cooling the oil, then the oil is, presuambly, warm or hot.  Therefore, the viscosity will be "low" (sort of).  If it is not a multi-component blend or a crude oil, but rather, is something like an SAE oil, it can probably be thought of as a Newtonian fluid.  For those fluids, I have had pretty good success with the DeGuzman-Andrade correlation for viscosity:

m = A x e^(B/T)

Pick two temperature-viscosity points, take logs on both sides, solve the simultaneous equations for A and B, and you might be close enough to what you need.

Regards,

SNORGY.

RE: Oil Cooling

(OP)
Hello, many thanks to everybody.
Mr Snorgy, indeed I was looking for a correlation for calculating heat transfer coefficient your rule is extremely helpful.
Please, which is the unit of temperature ? C ? K ?

Many thanks
 

RE: Oil Cooling

The units are Kelvin.

You are very welcome.

Regards,

SNORGY.

RE: Oil Cooling

(OP)
Many thanks to everybody
Wish you a wonderful 2011

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