Equation for conductivity value of organic liquids
Equation for conductivity value of organic liquids
(OP)
Dear friends,
To calculate thermal conductivity value of organic liquids I found the following formulae in April 12,1975 issue of Chemical Engineering. Is it can be used to calculate thermal conductivity value of SAE 10W oil.
K =0.000877 x Density^(0.83) x (293/T)^(0.38) Cal/(s-cm- °C)
Cp in (CAL/Gm/°C)
Density in (gm/cc)
T in °K in absolute
Please advise. Thanks in advance.
To calculate thermal conductivity value of organic liquids I found the following formulae in April 12,1975 issue of Chemical Engineering. Is it can be used to calculate thermal conductivity value of SAE 10W oil.
K =0.000877 x Density^(0.83) x (293/T)^(0.38) Cal/(s-cm- °C)
Cp in (CAL/Gm/°C)
Density in (gm/cc)
T in °K in absolute
Please advise. Thanks in advance.





RE: Equation for conductivity value of organic liquids
k= 0.07727 -(4.558E-5)*T
where T is Fahrenheit and k is BTU/ft-hr-F. Average error is said to be 10%, with maximum error 40%. This was a best fit of data from five sources. In 1997, Chapter 12 was revised to improve the accuracy of the above equation form slightly, to 6% average, 24% maximum. They also added a procedure to use when the mean average boiling point of the fraction is known.
RE: Equation for conductivity value of organic liquids
K = (0.12/s)(1-0.0001667 T)
K = conductivity, W/mK
s = specific gravity @ 60 deg F
T = temperature, deg C.
It is apparent that an exact value cannot be found. It is also difficult to know what is the effect the additives have on a 10W oil.
If one selects a formula and sticks to it, one's systematic errors will then not change much. It wouldn't be practical to express results with more than two significant figures.
RE: Equation for conductivity value of organic liquids
Thanks to both of you.I have an STHE data sheet with SAE 10W oil on S/S. K Value is not given in the data sheet. I try the design with K from these two formulas.
Thanks once again.