Find Pressure Increase for Mineral Oil due to change in Temp
Find Pressure Increase for Mineral Oil due to change in Temp
(OP)
Hi,
I'm working with a closed system full of mineral oil and the temp is increased from 25 C to 138 C. How do i calculate the increase in pressure due to the rise in temp? A physical experiment gave us a reading of 6,100 psi (42.06 Mpa) at 280 F (138 C) in a closed chamber with a pressure transducer but i cannot get the same number when trying to calculate this.
The parameters are,
- Coefficient of thermal expansion of mineral oil = 0.00064 1/C
- Initial Temp = 25 C
- Final Temp = 138 C
- Oil Volume = 4.430 Liters
- Bulk Modulus of Mineral Oil = 1.8 Gpa
- No change in volume
I'm working with a closed system full of mineral oil and the temp is increased from 25 C to 138 C. How do i calculate the increase in pressure due to the rise in temp? A physical experiment gave us a reading of 6,100 psi (42.06 Mpa) at 280 F (138 C) in a closed chamber with a pressure transducer but i cannot get the same number when trying to calculate this.
The parameters are,
- Coefficient of thermal expansion of mineral oil = 0.00064 1/C
- Initial Temp = 25 C
- Final Temp = 138 C
- Oil Volume = 4.430 Liters
- Bulk Modulus of Mineral Oil = 1.8 Gpa
- No change in volume
RE: Find Pressure Increase for Mineral Oil due to change in Temp
It's all about liquid expansion. What was the pressure at 25o C?
Good Luck,
Latexman
RE: Find Pressure Increase for Mineral Oil due to change in Temp
RE: Find Pressure Increase for Mineral Oil due to change in Temp
Why do any calculation, when all that is needed to prevent any significant pressure increase is a few dozen milliliters of nitrogen (or vacuum) somewhere in the chamber or instrumentation tubing?
Did you know the pressure rating of the chamber before your experiment and take the precautions needed for if, or when, it exploded?
RE: Find Pressure Increase for Mineral Oil due to change in Temp
To say the volume does not change is correct in a macro sense, but incorrect when you're operating at such small changes in volume.
So theoretical pressure based on absolutely no expansion of the vessel gets you about 130 Mpa. You have 42 (answer to life the universe and everything). Not too far adrift.
https://www.theguardian.com/books/2011/feb/03/doug...
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RE: Find Pressure Increase for Mineral Oil due to change in Temp
https://www.eng-tips.com/faqs.cfm?fid=1339
Daniel
Rio de Janeiro - Brazil
RE: Find Pressure Increase for Mineral Oil due to change in Temp
That's a non-answer.
Good Luck,
Latexman
RE: Find Pressure Increase for Mineral Oil due to change in Temp
TTFN (ta ta for now)
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RE: Find Pressure Increase for Mineral Oil due to change in Temp