Two-Phase Flows with Solid Particles, Droplets, and Bubbles: Problems and Research Results (Review)
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AND MASS TRANSFER AND PHYSICAL GASDYNAMICS
Two-Phase Flows with Solid Particles, Droplets, and Bubbles: Problems and Research Results (Review) A. Yu. Varaksina, b, * a
Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, Russia bBauman Moscow State Technical University, Moscow, Russia *e-mail: [email protected] Received March 5, 2020; revised March 10, 2020; accepted March 10, 2020
Abstract—The computational-theoretical and experimental works on different types of two-phase flows are reviewed. The problems of two-phase flows and features of their study are considered. The basic characteristics of two-phase flows and the methods of their simulation are provided. The results of the study of twophase flows with solid particles, droplets, and bubbles are outlined and analyzed. DOI: 10.1134/S0018151X20040161
CONTENTS Introduction 1. Problems and features of the study of two-phase flows 1.1. Multiscale character 1.2. Multiplicity of force factors 1.3. Multiplicity of modeling parameters 1.4. Presence of different collision processes 1.5. Presence of phase and chemical transformations 1.6. Multiplicity of dimensionless parameters 2. Modern methods for the modeling of two-phase flows 2.1. Description of the motion of disperse phase: Lagrangian and eulerian approaches 2.2. Methods of direct numerical simulation (DNS and LES) 2.3. Methods for the simulation of flows with moving boundaries 2.4. Methods of physical simulation 3. Two-phase flows with particles 4. Two-phase flows with droplets 5. Two-phase flows with bubbles Conclusions References INTRODUCTION The flows of a medium carrying a disperse admixture in the form of solid particles, droplets, or bubbles take place in a series of natural phenomena: tornados [1], dust storms, volcanic eruptions, wildfires, precipitation in the form of hail, show, rain, different types of fog, gas liberation in seas and oceans, etc. Typical examples of technical facilities with two-phase flows
include the combustion chambers of thermal engines, the paths of solid- and liquid-propellant reaction engines, facilities for the thermal pretreatment of coal in schemes for the power-engineering use of fuel, steam generators, firefighting systems, heat exchangers with two-phase working bodies, sand- and beadblasting facilities with different surfaces, pneumatic conveyors of granular materials, dust collectors of different types, and many others. The main types of two-phase (heterogeneous) systems are gas–solid particles, gas–droplets, liquid– solid particles, and liquid–bubbles. The interest of many research groups around the world regarding research on two-phase (multiphase, heterogeneous) flows has steadily increased in recent decades. In the 60 years of the existence of the Joint Institute for High Temperatures of the Russian Academy of Sciences, its researchers have published hundreds of original and pioneering works on particular aspects of fluid and gas dynamics and the thermal physics of multiphase flows. Many of them were printed in the journal High Temperature
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