Influence of random statistical factors on dispersed particles motion in a two-phase flow: physical and mathematical modeling
M.A. Abramov1,2, K.Yu. Arefyev1,2, A.V. Voronetskii2, I.M. Grishin1, S.V. Kruchkov1,2
1Moscow Institute for Physics and Technology, Dolgoprudnij, Russia
2Bauman State Technical University, Moscow, Russia
Keywords: two-phase flows, particles, Lagrange-Euler method, probability density, standard deviation, flow stress, locally continuous field
Abstract
The work is devoted to the study of random statistical processes in two-phase flows. The objective is to obtain new computational and experimental data on the influence of previously undetermined factors on the trajectories of particle motion, their segregation, and the formation of a locally continuous flow field of the dispersed phase in supersonic turbulent two-phase flows. The results of computational and experimental study of the flow features of a two-phase supersonic flow are presented. A new experimental method was applied for analysis of influence of random statistical factors on the particle distribution in a high-speed carrier flow. The physical basis of the proposed method is to indicate the flow rate of the dispersed phase by means of particle adhesion to an obstacle installed in the flow. In order to analyze the segregation of the dispersed phase in the flow, the approach of quasi-continuumization of individual particle trajectories is applied. The method obtains a locally continuous flow stress field for dispersed phase flow. Empirical coefficients resulting from the influence of random statistical factors on the motion of dispersed particles in a two-phase flow are determined. The obtained computational and experimental data clarify the prediction of the distribution and segregation of dispersed phase particles with a size of 15÷40 microns in a supersonic free flow.
|
