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    Anomalous heat transport in binary hard-sphere gases

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    Access Status
    Open access
    Authors
    Moir, C.
    Lue, L.
    Gale, Julian
    Raiteri, Paolo
    Bannerman, M.N.
    Date
    2019
    Type
    Journal Article
    
    Metadata
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    Citation
    Moir, C. and Lue, L. and Gale, J.D. and Raiteri, P. and Bannerman, M.N. 2019. Anomalous heat transport in binary hard-sphere gases. Physical Review E. 99 (3): ARTN 030102.
    Source Title
    Physical Review E
    DOI
    10.1103/PhysRevE.99.030102
    ISSN
    2470-0045
    Faculty
    Faculty of Science and Engineering
    School
    School of Molecular and Life Sciences (MLS)
    Remarks

    Copyright © 2019 American Physical Society

    URI
    http://hdl.handle.net/20.500.11937/77071
    Collection
    • Curtin Research Publications
    Abstract

    © 2019 American Physical Society. Equilibrium and nonequilibrium 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 nonequilibrium 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 existence 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 and parallel bounds as this Rapid Communication demonstrates they are a fundamental feature of even simple fluids.

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