Solid-Liquid Two-Phase Flow in Centrifugal Pump

This book conducts a systematic study on internal flow characteristics and performance of centrifugal pump for solid–liquid mixed transportation. First, the applicability of the computational model for two-phase flow is analyzed. Then the relationship between the two-phase flow characteristics and wall wear in the pipeline is revealed. And the flow characteristics in centrifugal pumps are analyzed in relation to conveying performance and wall wear. Finally, the engineering application calculation of the mixed transportation pump with different impeller structures is carried out. The target audience of this book is researchers who perform calculations and engineering applications of solid–liquid two-phase pumps. This book considers the influence of the particle size on the force magnitude of the particles and analyzes the applicability of different solid–liquid two-phase calculation models. Considering the different motion trajectories of particles colliding with dry wall, wet wall, stationary wall, and moving wall, visual experiments are used to study the collision rebound model of different walls. The collision rebound model is applied to the numerical simulation of solid–liquid mixed transport. Contents 1 Introduction 1.1 Two-Phase Flow Model and Calculation Method 1.2 Two-Phase Transport Performance and Prediction 1.3 Two-Phase Wear Properties References 2 Solid–Liquid Two-Phase Calculation Model and Method 2.1 Solid–Liquid Two-Phase Model 2.1.1 Analysis of the Force of Moving Particles in Fluids 2.1.2 Calculation Model of Solid–Liquid Two-Phase Flow 2.1.3 Model Suitability Study 2.2 Collision Rebound Model 2.2.1 Wet and Dry Wall Collision Rebound 2.2.2 Rotating Wall Collision Rebound References 3 Wear Characteristics of Static Walls 3.1 Calculation Method and Experiment 3.1.1 Computational Method and Geometric Model 3.1.2 Experimental System and Measurement Method 3.1.3 Results Comparison and Calculation Method Verification 3.2 Particle Motion and Wear Characteristics in the Bend Pipe 3.2.1 Analysis of Particle Motion in the Bend Pipe 3.2.2 Analysis of Wall Wear Characteristics 3.3 Effect of Wall Shape Change on Wear 3.3.1 Wear Analysis of Wall Surface with Bump in Bend Pipe 3.3.2 Wear Analysis of Wall Surface with Groove in Bend Pipe References 4 Two-Phase Flow Characteristics and Transportation Performance in Centrifugal Pump 4.1 Calculation of Two-Phase Flow in Pump Based on Mixture Model 4.1.1 Calculation Scheme and Grid 4.1.2 Different Solid Particle Sizes Conditions 4.1.3 Different Solid Concentration Conditions 4.1.4 Different Flow Conditions 4.1.5 Different Solid Density Conditions 4.2 Two Phase Flow Calculation in Pump Based on DPM Model 4.2.1 Calculation Scheme 4.2.2 Different Solid Particle Sizes Conditions 4.2.3 Different Solid Concentration Conditions 4.2.4 Different Flow Conditions 4.3 Two Phase Flow Calculation in Pump Based on DEM Model 4.3.1 Calculation Method and Scheme 4.3.2 Analysis of Particle Motion Characteristics 4.3.3 Influence of Particle Mass Concentration on Flow Field in Centrifugal Pump Reference 5 Wear Characteristics of the Wall Surface in Centrifugal Pump 5.1 Solid–Liquid Two-Phase Transport Experiment and Calculation Method Verification 5.1.1 Experimental Apparatus 5.1.2 Grid and Calculation Settings 5.1.3 Calculation Method Verification 5.2 Wear of the Centrifugal Pump Runner 5.2.1 Impeller Wear Analysis 5.2.2 Volute Wear Analysis 5.2.3 Wear Analysis of Front and Rear Wear Plates 5.3 Wear of the Pipeline Matched with Centrifugal Pump 5.3.1 Vertical Pipe Wear Analysis 5.3.2 Bend Pipe Wear Analysis 5.3.3 Horizontal Pipe Wear Analysis 5.3.4 Particle Motion Analysis Inside Pipes 5.4 Wear of the Flow Channel for Conveying Mixed Size Particle 5.4.1 Calculation Method and Scheme 5.4.2 Calculation Method Verification 5.4.3 Runner Wear Analysis 5.4.4 Relationship Analysis Between the Flow Characteristics and Wear Characteristics Reference 6 Engineering Calculation of Solid–Liquid Two-Phase Pump 6.1 Single-Stage Centrifugal Pump 6.1.1 Geometric Model and Calculation Settings 6.1.2 Analysis of Solid–Liquid Two-Phase Flow Calculation Results 6.2 High Speed Centrifugal Pump with Compound Impeller 6.2.1 Geometric Model and Calculation Settings 6.2.2 Analysis of Solid–Liquid Two-Phase Flow Calculation Results 6.3 Two-Stage Centrifugal Pump 6.3.1 Geometric Model and Calculation Settings 6.3.2 Analysis of Solid–Liquid Two-Phase Flow Calculation Results