MODE-COUPLING IN NONEQUILIBRIUM GRANULAR FLOW SYSTEMS

In this paper we examine the role of mode coupling in nonequilibrium g ranular flow systems and derive mode coupling equations lor equal-time multi-linear correlation functions in general nonequilibrium systems. By applying N-ordering analysis and projection operator techniques, t he hierarchy of equations obtained is simplified which permits the equ al-time multilinear averages to be calculated systematically. The line ar and equal-time bilinear nonequilibrium correlation functions are ca lculated explicitly for a steady-state system characterized by a small linear shear flow and uniform number and internal energy densities.