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Research from K. Hovhannisyan and co-researchers provides new data

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  • Research from K. Hovhannisyan and co-researchers provides new data

    Journal of Technology & Science
    November 28, 2010

    STATISTICAL MECHANICS;
    Research from K. Hovhannisyan and co-researchers provides new data on
    statistical mechanics


    According to recent research published in the Journal of Statistical
    Mechanics - Theory and Experiment, "Situations where a spontaneous
    process of energy or matter transfer is enhanced by an external device
    are widespread in nature (the human sweating system, enzyme catalysis,
    facilitated diffusion across biomembranes, industrial heat-exchangers
    and so on). The thermodynamics of such processes remains, however,
    open."

    "Here we study enhanced heat transfer by using a model junction
    immersed between two thermal baths at different temperatures T-h and
    T-c (T-h > T-c). The transferred heat power is enhanced via
    controlling the junction by means of external time-dependent fields.
    Provided that the spontaneous heat flow process is optimized over the
    junction Hamiltonian, any enhancement of this spontaneous process
    demands consumption and subsequent dissipation of work. The efficiency
    of the enhancement is defined via the increment in the heat power
    divided by the amount of work done. We show that this efficiency is
    bounded from above by T-c/(T-h-T-c). Formally this is identical to the
    Carnot bound for the efficiency of ordinary refrigerators which
    transfer heat from cold to hot bodies," wrote K. Hovhannisyan and
    colleagues.

    The researchers concluded: "It also shares some (but not all) physical
    features of the Carnot bound."

    Hovhannisyan and colleagues published their study in the Journal of
    Statistical Mechanics - Theory and Experiment (The thermodynamics of
    enhanced heat transfer: a model study. Journal of Statistical
    Mechanics - Theory and Experiment, 2010;():6010).

    For additional information, contact K. Hovhannisyan, Yerevan Physics
    Institute, Alikhanian Bros St. 2, Yerevan 375036, Armenia.

    The publisher's contact information for the Journal of Statistical
    Mechanics - Theory and Experiment is: IOP Publishing Ltd., Dirac
    House, Temple Back, Bristol BS1 6BE, England.




    From: A. Papazian
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