Would anyone happen to know where I can find a graph showing Specific Heat as a function of temperature and viscosity for lubricating oil?
thanks
b
Original Post
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Why do you need the information, what do you want to achieve with it for which application?
Bryan,
There is/was a book by Exxon called Tables of Useful Information that had some details regarding this type of information. However that was more geared towards oil as a fuel and used the density and viscosity as a determiner. The problem with this is when you start looking at lubricants that get their specific gravity and their viscosity in part from their additave packages this then would have a significent impact in trying to determine the anticipated output from a product. The other issue is that the calculations are also based on total product usage at optimal conditions. So there is going to be some losses even when there is some viscosity blending going on. You would probably be better of taking this question to a conbustion engineering group. Here's one to look at.
http://www.eng-tips.com/gthreadminder.cfm/lev2/26/lev3/74/pid/610
regards.......
There is/was a book by Exxon called Tables of Useful Information that had some details regarding this type of information. However that was more geared towards oil as a fuel and used the density and viscosity as a determiner. The problem with this is when you start looking at lubricants that get their specific gravity and their viscosity in part from their additave packages this then would have a significent impact in trying to determine the anticipated output from a product. The other issue is that the calculations are also based on total product usage at optimal conditions. So there is going to be some losses even when there is some viscosity blending going on. You would probably be better of taking this question to a conbustion engineering group. Here's one to look at.
http://www.eng-tips.com/gthreadminder.cfm/lev2/26/lev3/74/pid/610
regards.......
You've asked a very general question that does not have an easy straight forward answer as Alan has stated.
If you could be a little bit more specific with your problem, I might be able to give some answers.
What you have asked would be specific to the type of lubricant adn specific to the viscosity grade.
In general, with hydrocarbon based oils, specific heat will increase with an increase in temperature and slightly decrease with a more viscous version of the same oil type.
If you could be a little bit more specific with your problem, I might be able to give some answers.
What you have asked would be specific to the type of lubricant adn specific to the viscosity grade.
In general, with hydrocarbon based oils, specific heat will increase with an increase in temperature and slightly decrease with a more viscous version of the same oil type.
hello,
I need the specific heat of ISO VG32 oil at 160F
for calculating the max. temperature drop through a cooler knowing its heat rejection rate.
I will be thankful if you can also provide the relation between specific heat and viscosity of a fluid.
Regards
Ganesh
I need the specific heat of ISO VG32 oil at 160F
for calculating the max. temperature drop through a cooler knowing its heat rejection rate.
I will be thankful if you can also provide the relation between specific heat and viscosity of a fluid.
Regards
Ganesh
Gani,
you can use this formula:
CP at T = 4.19*((0.402+0.00081*T)/D^0.5)
CP at T: Specific Heat @ constant P (kJ/kg.K)
T : Temperature ( C )
D : Density at 15 C (g/cm3)
Find the density @ T, and then calculate with ASTM D 1298 to find Density @ 15 C
Refference:
Schmierstoffe„“Wissensspeicher Tribotechnik“ – VEB Fachbuchverlag Leipzig
You can also contact your Oil Vendor who concern on Heat Transfer Oil to get the exact property
regards,
Nurudin
you can use this formula:
CP at T = 4.19*((0.402+0.00081*T)/D^0.5)
CP at T: Specific Heat @ constant P (kJ/kg.K)
T : Temperature ( C )
D : Density at 15 C (g/cm3)
Find the density @ T, and then calculate with ASTM D 1298 to find Density @ 15 C
Refference:
Schmierstoffe„“Wissensspeicher Tribotechnik“ – VEB Fachbuchverlag Leipzig
You can also contact your Oil Vendor who concern on Heat Transfer Oil to get the exact property
regards,
Nurudin
Nurudin,
Thanks a lot for answering my question.I was able to find the density at 15C from supplier catalog.
Thanks a lot for answering my question.I was able to find the density at 15C from supplier catalog.
