期刊名称：Eastern-European Journal of Enterprise Technologies
印刷版ISSN：1729-3774
电子版ISSN：1729-4061
出版年度：2017
卷号：5
期号：1
页码：59-69
DOI：10.15587/1729-4061.2017.110444
语种：English
出版社：PC Technology Center
摘要：The efficiency of working processes of machines of the drum type is determined by the mode of flow of the fill in a rotating chamber. But the numerical and experimental results obtained over a recent period approach the actual behavior of the examined medium only in terms of qualitative characteristics.A mathematical model is built for a three-phase flow mode of granular fill in the cross section of a cylindrical chamber that rotates around the horizontal axis. The analytical-experimental research method is applied. A calculation algorithm is derived that approximately establishes position of the flow regions and the distribution of velocities in the cross sections normal to the flow direction, depending on the kinematic, geometrical, inertial, and rheological parameters of the system.Based on the performed modeling, the effect of rotation velocity of the chamber on the characteristics of a three-phase flow mode of the fill was determined. We established conditions when mass fractions of the active sliding layer and the region of a non-free fall reach maximal values, while mass fraction of the passive quasi-solid-body region acquires a minimum value. The conditions are determined when thickness and mean velocity of the sliding layer reach a maximum.We revealed a predominant reduction in thickness, in the average velocity and the shear rate gradient in the normal cross section along the length of the layer. A decrease in the thickness and an increase in the average velocity and the gradient of shear rate of the sliding layer were registered with a decrease in the relative size of the chamber granular fill’s element.Visualization of flow patterns confirmed a convergence of the calculation results and experimental data within a range of 11–13%.
