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
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
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
RE: Oil Cooling
You can find various correlations at:
http://www.cheresources.com/convection.shtml
Also you will possibly find some useful information at:
www.cheresources.com
The correlation references came from this site
RE: Oil Cooling
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
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
You are very welcome.
Regards,
SNORGY.
RE: Oil Cooling
You could try the attached spreadsheet (downloaded from http://www.xlrotor.com/index.shtml). It shows several oil type's properties vs temperature
RE: Oil Cooling
Wish you a wonderful 2011