On the orientational dynamics and viscoelasticity of Brownian rigid disklike particles suspended in a shear flow

In this study, numerical simulations are employed to study the orientational bahevior of a dilute suspension of Brownian rigid disklike particles in a simple shear flow. Also, the viscoelasticity of such suspension is analyzed by looking at the stress budget of the two-phase material. A direct Monte-Carlo simulator as well as the moment approximation approaches with two different closure models are used to produce the data. The results are compared by available experimental and analytical data and a very good agreement is established. After the validation of the simulators, the different results are discussed. Different P''eclet numbers and shape factors of particles are considered and various results are presented, e.g. particle orientations in space, viscous and elastic contributions to the non-Newtonian stress tensor, etc.