Monte Carlo simulation of self-avoiding lattice chains under slit flow

This paper proposes a pseudo-potential describing slit flow in the formalis m of lattice Monte Carlo simulation with the bond fluctuation algorithm as the unique basic micro-relaxation mode. The main characteristics of slit fl ow, such as the parabolic velocity profile and the pressure-flux relationsh ip, are successfully reproduced in a three-dimensional self-avoiding multic hain system. Both Newtonian and non-Newtonian regimes are revealed. The cha in conformation and nonlinear rheological behavior are investigated. The si mulation results agree with experimental measurements. This method call be used to investigate the viscoelastic properties at different layers as well as the global properties. Some peculiar phenomena in inhomogeneous flow ar e found to be consistent with previous theoretical predictions by others.