论文标题
热驱动的微型机器的不可逆性和熵产生
Irreversibility and entropy production of a thermally driven micromachine
论文作者
论文摘要
我们讨论了由三个球体组成的热驱动的微型机械的非平衡性能，这些球体处于平衡状态，具有不同温度的独立热浴。在线性随机Langevin描述的框架内，我们计算了时间依赖的平均不可逆性，该不可逆性在有限的时间内最大值。这个时间尺度大致由春季放松时间设定。根据球体的温度和摩擦系数，获得稳态平均熵产生速率。平均熵产生速率取决于三球微机械的热和/或机械不对称。我们还获得了热驱动的三球微马机械的质量扩散系数的中心，这是不同温度和摩擦系数的函数。随着总熵产生速率和扩散系数的结果，我们最终讨论了热驱动的微型机械的效率。
We discuss the non-equilibrium properties of a thermally driven micromachine consisting of three spheres which are in equilibrium with independent heat baths characterized by different temperatures. Within the framework of a linear stochastic Langevin description, we calculate the time-dependent average irreversibility that takes a maximum value for a finite time. This time scale is roughly set by the spring relaxation time. The steady-state average entropy production rate is obtained in terms of the temperatures and the friction coefficients of the spheres. The average entropy production rate depends on thermal and/or mechanical asymmetry of a three-sphere micromachine. We also obtain the center of mass diffusion coefficient of a thermally driven three-sphere micromachine as a function of different temperatures and friction coefficients. With the results of the total entropy production rate and the diffusion coefficient, we finally discuss the efficiency of a thermally driven micromachine.
