Sarracino A, Gnoli A, Puglisi A
CNR-ISC and Dipartimento di Fisica, Università Sapienza, Piazzale A. Moro 2, 00185 Roma, Italy.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Apr;87(4):040101. doi: 10.1103/PhysRevE.87.040101. Epub 2013 Apr 22.
The effect of Coulomb friction is studied in the framework of collisional ratchets. It turns out that the average drift of these devices can be expressed as the combination of a term related to the lack of equipartition between the probe and the surrounding bath, and a term featuring the average frictional force. We illustrate this general result in the asymmetric Rayleigh piston, showing how Coulomb friction can induce a ratchet effect in a Brownian particle in contact with an equilibrium bath. An explicit analytical expression for the average velocity of the piston is obtained in the rare collision limit. Numerical simulations support the analytical findings.
在碰撞棘轮的框架下研究了库仑摩擦的影响。结果表明，这些装置的平均漂移可以表示为与探针和周围浴之间缺乏能量均分相关的一项，以及以平均摩擦力为特征的一项的组合。我们在非对称瑞利活塞中说明了这一普遍结果，展示了库仑摩擦如何在与平衡浴接触的布朗粒子中诱导棘轮效应。在罕见碰撞极限下得到了活塞平均速度的显式解析表达式。数值模拟支持了这些解析结果。
