^{1,a)}, S. K. Mylona

^{1}, Ch. A. Tsiglifisi

^{1}, M. L. Huber

^{2}and R. A. Perkins

^{2}

### Abstract

This paper contains new, representative reference equations for the thermal conductivity of n-hexane. The equations are based in part upon a body of experimental data that has been critically assessed for internal consistency and for agreement with theory whenever possible. In the case of the dilute-gas thermal conductivity, a theoretically based correlation was adopted in order to extend the temperature range of the experimental data. Moreover, in the critical region, the experimentally observed enhancement of the thermal conductivity is well represented by theoretically based equations containing just one adjustable parameter. The correlations are applicable for the temperature range from the triple point to 600 K and pressures up to 500 MPa. The overall uncertainty (considered to be estimates of a combined expanded uncertainty with a coverage factor of 2) of the proposed correlation is estimated, for pressures less than 500 MPa and temperatures less than 600 K, to be less than 6%.

The work described in this paper was carried out under the auspices of the International Association for Transport Properties (IATP).

1. Introduction

2. Methodology

3. The Correlation

3.1. The dilute-gas limit

3.2. The residual thermal conductivity

3.3. The critical enhancement

3.3.1. Simplified crossover model

3.3.2. Empirical critical enhancement

3.4. The 0.101325 MPa liquid line

4. Computer-Program Verification

5. Conclusions

### Key Topics

- Thermal conductivity
- 38.0
- Boltzmann equations
- 8.0
- Critical point phenomena
- 8.0
- Viscosity
- 8.0
- Equations of state
- 7.0

## Figures

Temperature and pressure ranges of the primary experimental thermal conductivity data for n-hexane.

Temperature and pressure ranges of the primary experimental thermal conductivity data for n-hexane.

Dilute-gas limit thermal conductivity as a function of temperature. Golubev and Naziev ^{14} (◊); Naziev et al. ^{17} (□); Shashkov et al. ^{19} (◯); Gray et al. ^{24} (▲);Vines and Bennett ^{32} (●); Lambert et al. ^{33} (Δ); Mann and Dickins ^{34} (■); Eq. (6) (—–).

Percentage deviations of primary experimental data for dilute-gas n-hexane from the values calculated by Eq. (6) . Golubev and Naziev ^{14} (◊); Naziev et al. ^{17} (□); Shashkov et al. ^{19} (◯); Gray et al. ^{24} (▲); Vines and Bennett ^{32} (●); Lambert et al. ^{33} (Δ); Mann and Dickins ^{34} (■).

Percentage deviations of primary experimental data for dilute-gas n-hexane from the values calculated by Eq. (6) . Golubev and Naziev ^{14} (◊); Naziev et al. ^{17} (□); Shashkov et al. ^{19} (◯); Gray et al. ^{24} (▲); Vines and Bennett ^{32} (●); Lambert et al. ^{33} (Δ); Mann and Dickins ^{34} (■).

Percentage deviations of primary experimental data of n-hexane from the values calculated by the present model as a function of density. Watanabe and Seong ^{7} (●); Tanaka et al. ^{8} (✱); Assael et al. ^{9} (+); Li et al. ^{10} (□); Kashiwagi et al. ^{11} (◊); Naziev et al. ^{12} (Δ); Mukhamedzyanov and Usmanov ^{13} (▲); Golubev and Naziev ^{14} (◯).

Percentage deviations of primary experimental data of n-hexane from the values calculated by the present model as a function of density. Watanabe and Seong ^{7} (●); Tanaka et al. ^{8} (✱); Assael et al. ^{9} (+); Li et al. ^{10} (□); Kashiwagi et al. ^{11} (◊); Naziev et al. ^{12} (Δ); Mukhamedzyanov and Usmanov ^{13} (▲); Golubev and Naziev ^{14} (◯).

Percentage deviations of primary experimental data of n-hexane from the values calculated by the present model as a function of temperature. Watanabe and Seong ^{7} (●); Tanaka et al. ^{8} (✱); Assael et al. ^{9} (+); Li et al. ^{10} (□); Kashiwagi et al. ^{11} (◊); Naziev et al. ^{12} (Δ); Mukhamedzyanov and Usmanov ^{13} (▲); Golubev and Naziev ^{14} (◯).

Percentage deviations of primary experimental data of n-hexane from the values calculated by the present model as a function of temperature. Watanabe and Seong ^{7} (●); Tanaka et al. ^{8} (✱); Assael et al. ^{9} (+); Li et al. ^{10} (□); Kashiwagi et al. ^{11} (◊); Naziev et al. ^{12} (Δ); Mukhamedzyanov and Usmanov ^{13} (▲); Golubev and Naziev ^{14} (◯).

Percentage deviations of primary experimental data of n-hexane from the values calculated by the present model as a function of pressure. Watanabe and Seong ^{7} (●); Tanaka et al. ^{8} (✱); Assael et al. ^{9} (+); Li et al. ^{10} (□); Kashiwagi et al. ^{11} (◊); Naziev et al. ^{12} (Δ); Mukhamedzyanov and Usmanov ^{13} (▲); Golubev and Naziev ^{14} (◯).

Percentage deviations of primary experimental data of n-hexane from the values calculated by the present model as a function of pressure. Watanabe and Seong ^{7} (●); Tanaka et al. ^{8} (✱); Assael et al. ^{9} (+); Li et al. ^{10} (□); Kashiwagi et al. ^{11} (◊); Naziev et al. ^{12} (Δ); Mukhamedzyanov and Usmanov ^{13} (▲); Golubev and Naziev ^{14} (◯).

Percentage deviations of secondary experimental data of n-hexane from the values calculated by the present model as a function of temperature. Jicheng et al. ^{15} (); Rowley et al. ^{16} (◨); Naziev et al. ^{17} (□); El-Sharkawy et al. ^{18} (⌖); Shashkov et al. ^{19} (◓); Filippov et al. ^{20} (◐); Bulanov et al. ^{21} (◯); Mallan et al. ^{22} (▲); Brykov et al. ^{23} (Δ); Gray et al. ^{24} (⏀); Bogatov ^{25} (); Jobst ^{26} (♦); Mukhamedzyanov et al. ^{27} (⬓); Vilim ^{28} (✱); Lambert et al. ^{29} (⬙); Sakiadis and Coates ^{30} (◑); Filippov ^{31} (●); Vines and Bennett ^{32} (■); Lambert et al. ^{33} (◊); Mann and Dickins ^{34} (); Smith ^{35} (⬖); Hernqvist ^{36} (◒).

Percentage deviations of secondary experimental data of n-hexane from the values calculated by the present model as a function of temperature. Jicheng et al. ^{15} (); Rowley et al. ^{16} (◨); Naziev et al. ^{17} (□); El-Sharkawy et al. ^{18} (⌖); Shashkov et al. ^{19} (◓); Filippov et al. ^{20} (◐); Bulanov et al. ^{21} (◯); Mallan et al. ^{22} (▲); Brykov et al. ^{23} (Δ); Gray et al. ^{24} (⏀); Bogatov ^{25} (); Jobst ^{26} (♦); Mukhamedzyanov et al. ^{27} (⬓); Vilim ^{28} (✱); Lambert et al. ^{29} (⬙); Sakiadis and Coates ^{30} (◑); Filippov ^{31} (●); Vines and Bennett ^{32} (■); Lambert et al. ^{33} (◊); Mann and Dickins ^{34} (); Smith ^{35} (⬖); Hernqvist ^{36} (◒).

Thermal conductivity of n-hexane as a function of temperature for different pressures.

Thermal conductivity of n-hexane as a function of temperature for different pressures.

Percentage deviations of primary experimental data of n-hexane from the values calculated by Eqs. (1), (6), and (7) and the empirical enhancement of Eq. (12) as a function of temperature. Watanabe and Seong ^{7} (●); Tanaka et al. ^{8} (✱); Assael et al. ^{9} (+); Li et al. ^{10} (□); Kashiwagi et al. ^{11} (◊); Naziev et al. ^{12} (Δ); Mukhamedzyanov and Usmanov ^{13} (▲); Golubev and Naziev ^{14} (◯).

Percentage deviations of primary experimental data of n-hexane from the values calculated by Eqs. (1), (6), and (7) and the empirical enhancement of Eq. (12) as a function of temperature. Watanabe and Seong ^{7} (●); Tanaka et al. ^{8} (✱); Assael et al. ^{9} (+); Li et al. ^{10} (□); Kashiwagi et al. ^{11} (◊); Naziev et al. ^{12} (Δ); Mukhamedzyanov and Usmanov ^{13} (▲); Golubev and Naziev ^{14} (◯).

Percentage deviations of selected primary experimental data of n-hexane at 0.101325 MPa from the values calculated by Eqs. (1) and (6)–(11) . Assael et al. ^{9} (◯); Li et al. ^{10} (□); Kashiwagi et al. ^{11} (◊); Naziev et al. ^{12} (Δ); values calculated by Eq. (13) (—–).

## Tables

Thermal conductivity measurements of n-hexane

Thermal conductivity measurements of n-hexane

Coefficients of Eq. (7) for the residual thermal conductivity of n-hexane

Coefficients of Eq. (7) for the residual thermal conductivity of n-hexane

Evaluation of the n-hexane thermal-conductivity correlation for the primary data

Evaluation of the n-hexane thermal-conductivity correlation for the primary data

Sample points for computer verification of the correlating equations

Sample points for computer verification of the correlating equations

Article metrics loading...

Full text loading...

Commenting has been disabled for this content