Heat Flow and Efficiency in a Microscopic Engine

Abstract

We study the energestics of a thermal motor driven by temperature differences, which consists of Brownian particles moving in a sawtooth potential with an external load where the viscous medium is alternately in contact with hot and cold heat reservoir. The motor can work as a heat engine or a refrigerator under different conditions. The heat flow via both potential and kinetic energy are considered. The former is reversible when the engine works quasistatically and the latter is always irreversible. The efficiency of the heat engine (Coefficient Of Performance (COP) of a refrigerator) can never approach Carnot efficiency (COP).

16 pages, 14 figures

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Cited by in corpus (7)

• Fundamental aspects of steady-state conversion of heat to work at the nanoscale
• Efficiency at maximum power of Feynman's ratchet as a heat engine
• Inertial effects in B{ü}ttiker-Landauer Motor and Refrigerator at the Overdamped Limit
• Modeling an efficient Brownian heat engine
• Transport coefficients for a confined Brownian ratchet operating between two heat reservoirs
• Energy Landscape Design Principle for Optimal Energy Harnessing by Catalytic Molecular Machines
• Stochastic energetics of a Brownian motor and refrigerator driven by non-uniform temperature