Non-Newtonian hydrodynamics for a dilute granular suspension under uniform shear flow

Abstract

We study in this work a steady shearing laminar flow with null heat flux (usually called "uniform shear flow") in a gas-solid suspension at low density. The solid particles are modeled as a gas of smooth hard spheres with inelastic collisions while the influence of the surrounding interstitial fluid on the dynamics of grains is modeled by means of a volume drag force, in the context of a rheological model for suspensions. The model is solved by means of three different but complementary routes, two of them being theoretical (Grad's moment method applied to the corresponding Boltzmann equation and an exact solution of a kinetic model adapted to granular suspensions) and the other being computational (Monte Carlo simulations of the Boltzmann equation). Unlike in previous studies on granular sheared suspensions, we include in our Grad's solution nonlinear terms in the stress tensor in the collisional moment associated with the momentum transfer. This theoretical enhancement allows us for the detection and evaluation of the normal stress differences in the plane normal to the laminar flow. In addition, the exact solution of the kinetic model gives the explicit form of the velocity moments of the velocity distribution function. Comparison between our theoretical and numerical results shows in general a good agreement for the non-Newtonian rheological properties, the kurtosis (fourth velocity moment of the distribution function) and the velocity distribution of the kinetic model for quite strong inelasticity and not too large values of the (scaled) friction coefficient characterizing the viscous drag force. This shows the accuracy of our analytical results that allows us to describe in detail the flow dynamics of the granular suspension with zero heat flux throughout the paper.

18 pages, 11 figures (v1); 16 pages and 9 figures (v2, important revisions); to appear in Phys. Rev. E

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• Simple shear flow in granular suspensions: Inelastic Maxwell models and BGK-type kinetic model
• Assessment of kinetic theories for moderately dense granular binary mixtures: Shear viscosity coefficient
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• Generalization of the Grad method in plasma physics
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• Rheology of dilute granular gas mixtures where the grains interact via a square shoulder and well potential
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• Kinetic theory of discontinuous shear thickening of a moderately dense inertial suspension of frictionless soft particles
• Instabilities in granular gas-solid flows
• Diffusion of intruders in a granular gas thermostatted by a bath of elastic hard spheres
• Exact results for non-Newtonian transport properties in sheared granular suspensions: inelastic Maxwell models and BGK-type kinetic model
• Kinetic theory of discontinuous shear thickening for a dilute gas-solid suspension
• Exact Rheology of Uniform Shear Flow in a Gas of Inelastic and Rough Maxwell Particles