Determination of the Relative Permittivity of Heptane at Temperatures between (303 and 363) K and Pressures below 60 MPa with a Concentric Cylinder Capacitor at a Frequency of 1 kHz
Shen, Y.[Yijie], Goodwin, A. R. H.[Anthony R. H.], Pirolli, L.[Laurent], Marsh, K. N.[Kenneth N.], May, E. F.[Eric F.]
The relative electric permittivity, ?r(T, p), of liquid heptane has been determined with an estimated relative expanded uncertainty of +- 0.018 % from measurements of the complex capacitance of a concentric cylinder capacitor at temperatures between (293 and 363) K and pressures below 60.6 MPa. The measurements were corrected for the capacitor s isothermal compressibility that was determined by comparison of measurements of ?r(He, 303 K and 393 K, p) with ab initio results from quantum mechanics. The measured ?r(C7H16, T, p) were combined with the amount-of-substance density, ?, which was obtained from the equation of state reported by Span and Wagner (Int. J. Thermophys. 2003, 24, 41 109), to calculate the total molar polarizability, P, that was fit with an expanded (k = 2) relative uncertainty of +- 0.06 % to a correlation with three parameters. The ?r(T, p) obtained from the literature were converted to P*?, compared with our correlation, and found to have a relative difference of less than +- 0.5 % at temperatures that overlap ours.
Compounds
#
Formula
Name
1
C7H16
heptane
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.
Type
Compound-#
Property
Variable
Constraint
Phase
Method
#Points
POMD
1
Relative permittivity at various frequencies ; Liquid