Thermodynamic Performance Characteristics of a Brownian Microscopic Heat Engine Driven by Discrete and Periodic Temperature Field

• 来源期刊: 理论物理通讯(英文版)
• 学科: 物理学
• 关键词: 不可逆热机 微观粒子 温度场 离散性 周期特征 热力性能 驱动 布朗
• 年，卷（期）: 2010,（11）
• 所属期刊栏目: Geophysics, Astronomy, and Astrophysics
• 页码范围: 857-862
• 页数: 6页
• 分类号: O413.1 TK123
• 语种: 英文

摘要

A Brownian microscopic heat engine with a particle hopping on a one-dimensional lattice driven by adiscrete and periodic temperature field in a periodic sawtooth potential is investigated.In order to clarify the underlyingphysical pictures of the heat engine, the heat flow via the potential energy and the kinetic energy of the particles areconsidered simultaneously.Based on describing the jumps among the three states, the expressions of the efficiency andpower output of the heat engine are derived analytically.The general performance characteristic curves are plotted bynumerical calculation.It is found that the power output-efficiency curve is a loop-shaped one, which is similar to onefor a real irreversible heat engine.The influence of the ratio of the temperature of the hot and cold reservoirs and thesawtooth potential on the maximum efficiency and power output is analyzed for some given parameters.When the heatflows via the kinetic energy is neglected, the power output-efficiency curve is an open-shaped one, which is similar to onefor an endroeversible heat engine.