摘要
针对慢速密集颗粒流的特点,采用拟流体的方法,类比具有屈服应力的非牛顿流体,给出了适用于慢速密集颗粒流的本构方程表达形式,建立了用粗糙底面斜槽测量颗粒流当量粘性的数学模型,并以小麦颗粒为例,通过粗糙底面斜槽实验得出了小麦颗粒流的屈服应力及其本构方程的关键系数.将实验得出的小麦颗粒流本构关系系数作为其当量粘性的特征值对斜面流进行解析计算,体积流量的模型预测值与实验值的相对误差在15%以内.
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%.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2007年第3期467-471,共5页
The Chinese Journal of Process Engineering
基金
科技部农业科技成果转化重大基金资助项目(编号:04EFN217100386)
关键词
拟流体
颗粒流
本构方程
当量粘性
pseudo-fluid
granular flow
constitutive equation
equivalent viscosity
