Equilibrium calculation of the friction coefficient for a massive particle moving in finite liquid volume.
It is well established that the Green-Kubo type of expression of the friction coefficient for a massive colloidal particle, i.e., the force autocorrelation integral, vanishes at long times if the liquid volume is finite. Here I show that the nonzero friction coefficient, defined as the ratio of force on the particle and the average liquid velocity, can be found in the framework of the linear response theory as the ratio of the force autocorrelation integral and the correlation integral of liquid velocity and force on the particle. The finite inverse friction coefficient can be alternatively expressed as the autocorrelation integral of the liquid velocity.
Petravic
Janka
J
Complex Systems in Biology Group, Centre for Vascular Research, University of New South Wales, Sydney, New South Wales 2052, Australia. j.petravic@unsw.edu.au
D017276:Friction; D009038:Motion; D010316:Particle Size