### Abstract

Original language | English |
---|---|

Article number | 030102 |

Number of pages | 5 |

Journal | Physical Review E - Statistical, Nonlinear, and Soft Matter Physics |

Volume | 99 |

Issue number | 3 |

DOIs | |

Publication status | Published - 29 Mar 2019 |

### Fingerprint

### Keywords

- heat transfer
- kinetic theory
- binary fluids
- molecular dynamics
- MIXTURES
- DIAMETER RATIO 0.4
- COEFFICIENTS
- IRREVERSIBLE-PROCESSES
- THERMAL-CONDUCTIVITY
- NANOFLUIDS

### ASJC Scopus subject areas

- Condensed Matter Physics
- Statistical and Nonlinear Physics
- Statistics and Probability

### Cite this

*Physical Review E - Statistical, Nonlinear, and Soft Matter Physics*,

*99*(3), [030102]. https://doi.org/10.1103/PhysRevE.99.030102

**Anomalous heat transport in binary hard-sphere gases.** / Moir, Craig; Lue, Leo; Gale, Julian D.; Raiteri, Paolo; Bannerman, Marcus N. (Corresponding Author).

Research output: Contribution to journal › Letter

*Physical Review E - Statistical, Nonlinear, and Soft Matter Physics*, vol. 99, no. 3, 030102. https://doi.org/10.1103/PhysRevE.99.030102

}

TY - JOUR

T1 - Anomalous heat transport in binary hard-sphere gases

AU - Moir, Craig

AU - Lue, Leo

AU - Gale, Julian D.

AU - Raiteri, Paolo

AU - Bannerman, Marcus N.

N1 - The authors acknowledge the support of the Maxwell computing service at University of Aberdeen, and the Aberdeen-Curtin Alliance [30] between the University of Aberdeen (Scotland, UK) and Curtin University (Perth, Australia) which is funding the PhD of Craig Moir. Paolo Raiteri and Julian Gale thank the Australian Research Council for funding.

PY - 2019/3/29

Y1 - 2019/3/29

N2 - Equilibrium and non-equilibrium molecular dynamics (MD) are used to investigate the thermal conductivity of binary hard-sphere fluids. It is found that the thermal conductivity of a mixture can not only lie outside the series and parallel bounds set by their pure component values, but can lie beyond even the pure component fluid values. The MD simulations verify that revised Enskog theory can accurately predict non-equilibrium thermal conductivities at low densities and this theory is applied to explore the model parameter space. Only certain mass and size ratios are found to exhibit conductivity enhancements above the parallel bounds and dehancement below the series bounds. The anomalous dehancement is experimentally accessible in helium-hydrogen gas mixtures and a review of the literature confirms the existance of mixture thermal conductivity below the series bound and even below the pure fluid values, in accordance with the predictions of revised Enskog theory. The results reported here may reignite the debate in the nanofluid literature on the possible existence of anomalous thermal conductivities outside the series/parallel bounds as this work demonstrates they are a fundamental feature of even simple fluids.

AB - Equilibrium and non-equilibrium molecular dynamics (MD) are used to investigate the thermal conductivity of binary hard-sphere fluids. It is found that the thermal conductivity of a mixture can not only lie outside the series and parallel bounds set by their pure component values, but can lie beyond even the pure component fluid values. The MD simulations verify that revised Enskog theory can accurately predict non-equilibrium thermal conductivities at low densities and this theory is applied to explore the model parameter space. Only certain mass and size ratios are found to exhibit conductivity enhancements above the parallel bounds and dehancement below the series bounds. The anomalous dehancement is experimentally accessible in helium-hydrogen gas mixtures and a review of the literature confirms the existance of mixture thermal conductivity below the series bound and even below the pure fluid values, in accordance with the predictions of revised Enskog theory. The results reported here may reignite the debate in the nanofluid literature on the possible existence of anomalous thermal conductivities outside the series/parallel bounds as this work demonstrates they are a fundamental feature of even simple fluids.

KW - heat transfer

KW - kinetic theory

KW - binary fluids

KW - molecular dynamics

KW - MIXTURES

KW - DIAMETER RATIO 0.4

KW - COEFFICIENTS

KW - IRREVERSIBLE-PROCESSES

KW - THERMAL-CONDUCTIVITY

KW - NANOFLUIDS

UR - http://www.scopus.com/inward/record.url?scp=85064092845&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/anomalous-heat-transport-binary-hardsphere-gases

U2 - 10.1103/PhysRevE.99.030102

DO - 10.1103/PhysRevE.99.030102

M3 - Letter

VL - 99

JO - Physical Review. E, Statistical, Nonlinear and Soft Matter Physics

JF - Physical Review. E, Statistical, Nonlinear and Soft Matter Physics

SN - 1539-3755

IS - 3

M1 - 030102

ER -