Contents - Index


n-PENTANE

 

N-PENTANE provides high accuracy thermodynamic properties for normal pentane (Molar mass=72.147 g/mole) using the Fundamental Equation of State, as described by: 

 

R.T. Jacobsen, S.G. Penoncello and E.W. Lemmon

Thermodynamic Properties of Cryogenic Fluids

Plenum Press, ISBN 0-306-45522-6, 1997

 

The equation of state is based upon the formulation developed by:

Span, R.,

"Multiparameter Equations of State - An Accurate Source of Thermodynamic of Property Data," Springer, Berlin, Heidelberg, New York, (2000).  The parameters needed for this formulation were provided by Eric Lemmon at NIST, Boulder Co.

 

The specific heat of n-pentane in the ideal gas state is determined from

Jaeschke, M. and Schley, P.

"Ideal-Gas Thermodynamic Properties for Natural-Gas Applications"

Intl. Journal of Thermophysics, Vol. 16, No. 6, pp. 1381-1385, (1995)

 

Reference State 

    h = 0 kJ/kg, s = 0 kJ/kg-K at 298.15 K, 101.325 kPa.  The reference state can be changed using the $Reference directive.

 

Range of applicability for equation of state:

   177 K < T <  589 K

 0 < P < 55 MPa

 

Thermal Conductivity and liquid viscosity correlations were fit to tabular data provided in:

"Properties of Inorganic and Organic Fluids"

Edited by C.Y. Ho

Authored by: P.E. Liley, T. Makita, and Y. Tanaka.

CINDAS Data Series of Material Properties, Vol V-1

Hemisphere Publishing Corporation

Chapter 26 - n-Pentane

 

Gas-phase viscosity is from:

"Recommended Values for the Viscosity in the Limit of Zero Density and its Initial Density Dependence for Twelve Gases and Vapors: Revisited from Experiment

between 297 K and 691 K"

Eckhard Vogel

J. Phys. Chem. Ref. Data 49, 043102 (2020); https://doi.org/10.1063/5.0023688 

 

Range of applicability for transport function correlations:

Gas-phase viscosity:  290 K to 589 K

Liquid-phase viscosity: 177K to 470 K

Gas-phase thermal conductivity: 290 K to 589K

Liquid-phase thermal conductivity: 177K to 470 K

 

Surface tension data are provided through a correlation developed by:

G.R. Somayajulu

"A Generalized Equation for Surface Tension from the Triple Point to the Critical Point"

International Journal of Thermophysics, Vol. 9, No. 4, 1988

 

The melting pressure curve (valid for temperatures between 143.47 K and 251 K) is determined from:

Lide, D.R. and Kehiaian, H.V.,

CRC Handbook of Thermophysical and Thermochemical Data

CRC Press, 1994, ISBN 0-8493-0197-1, 5th printing

 

 

 

Fluid Property Information