Isothermal compressibility & volume expansitivity
Isothermal compressibility & volume expansitivity
(OP)
I am on a research project concerning refrigerants and I need to find relations in terms of pressure and temperature for Isothermal compressibility & volume expansitivity. Do u know where I can get those or do u have any?





RE: Isothermal compressibility & volume expansitivity
For tetrachloromethane and others I think the CRC Handbook of Chemistry and Physics can be of help.
RE: Isothermal compressibility & volume expansitivity
Also would the information there be in form of values or a correlation or an equation. The last two would be most helpful for me.
Thanks again
RE: Isothermal compressibility & volume expansitivity
The source I mentioned can be raised by asking
Press name => write name => condensed phase => search => fluid properties => choose units => select range => delete v in small square, and press for data.
If you need an example of how to estimate those properties just ask. Good luck.
RE: Isothermal compressibility & volume expansitivity
RE: Isothermal compressibility & volume expansitivity
temp., oC Vol., m3/kg
29 0.0016751
30 0.0016795
31 0.0016839
Cubic thermal expansion, (1/V)(dV/dT)p:
(16795-16751)/16751=0.0026267
(16839-16795)/16795=0.0026198
Isothermal compressibility at 30oC, (1/V)(dV/dp)T
Press. bar Volume, m3/kg
13.5 0.0016797
14.5 0.0016794
The change:
The exercise could have been made also estimating the bulk volume modulus of elasticity via the sound speed and the density, but with larger deviations. The isothermal compressibility being its reciprocal.
RE: Isothermal compressibility & volume expansitivity
Art Montemayor
Spring, TX
RE: Isothermal compressibility & volume expansitivity
Thanks!!!!!!
Ade
RE: Isothermal compressibility & volume expansitivity
Thanks
RE: Isothermal compressibility & volume expansitivity
(1/V)(dV/dp)T at the starting conditions.
Here is an example for ethanol at 70oC with data taken from the CRC Handbook of Chemistry and Physics:
(1/V)(dV/dT)p = 0.00167/oC
(1/V)(dV/dp)T = 0.001593/Mpa
This is an approximate result since the compressibility is assumed at relatively low pressures, but it may serve as an indication of what is to be expected.