关键词: 拟流体, 颗粒流, 本构方程, 当量粘性

Abstract: For the slow intensive granular flow, the method of describing the granular flow as a pseudo-fluid flow is employed in this work. By analogy with non-Newton fluid with yield stress, a constitutive equation is put forward for slow intensive granular flow, and a mathematical model of testing granular equivalent viscosity is presented. Based on the experiment of wheat granules flowing down a rough inclined chute, the yield stress and the key coefficients of constitutive equation of the wheat granule flow are calculated. From theoretical analysis of wheat granule chute flow using the coefficients of the constitutive relation from experiment, the relative error of the prediction of the volume flow rate compared with corresponding experimental data is less than 15%.

Key words: pseudo-fluid, granular flow, constitutive equation, equivalent viscosity