Mesoscale Analysis of Hydraulics.

• Author: Xu, Weilin.
• Place / Publishing House: Singapore : : Springer Singapore Pte. Limited,, 2020.; ©2021.
• Year of Publication: 2020
• Edition: 1st ed.
• Language: English
• Physical Description: 1 online resource (253 pages)

Table of Contents

Intro -- Foreword I -- Foreword II -- Acknowledgments -- Contents -- About the Author -- List of Main Symbols -- List of Main Acronyms -- 1 Introduction -- 1.1 Definition of Mesoscale -- 1.2 Necessity of Mesoscale Research -- 1.3 Main Contents of Mesoscale Research -- References -- 2 Mesoscale Analysis of Cavitation and Cavitation Erosion -- 2.1 Background -- 2.2 Interactions Between Cavitation Bubbles and Rigid Boundaries -- 2.2.1 Shock Waves and Microjets Generated from the Collapse of CBs -- 2.2.2 Effects of the Geometric Shape of a Boundary on the Collapse Behavior of a CB -- 2.3 Interactions Between Cavitation Bubbles and Elastic Boundaries -- 2.3.1 Morphology of CBs Near Elastic Boundaries During the Collapsing Process -- 2.3.2 Shock Waves Generated by CBs Near Elastic Boundaries When Collapsing -- 2.3.3 Cavitation Erosion Resistance of Elastic Materials -- 2.4 Interactions Between Cavitation Bubbles -- 2.4.1 Interactions Between Two CBs -- 2.4.2 Interactions Between Multiple CBs -- 2.5 Interactions Between Cavitation Bubbles and Particles -- 2.5.1 Effects of Particles on the Collapse Directions of CBs -- 2.5.2 Effects of a Particle on the Shock Wave Generated by a CB When Collapsing -- 2.5.3 Effects of Particles on Cavitation Erosion -- 2.6 Collapse Locations of Cavitation Bubbles and Cavitation Erosion Control in Engineering Practice -- 2.6.1 Collapse Location Distribution Pattern of CBs in a Flow Past a Convex Body -- 2.6.2 Relationship of the Collapse Locations of CBs in a Flow Past a Convex Body with the Flow Field -- 2.6.3 Critical Conditions Required for Near-Boundary Collapse of CBs in a Flow Past a Convex Body -- 2.7 Conclusions -- References -- 3 Mesoscale Analysis of Aeration for Cavitation Erosion Protection -- 3.1 Background -- 3.2 Attenuation Effect of Air Bubbles on the Collapse Intensity of Cavitation Bubbles.

3.2.1 Intensity of the Collapse Noise of a Cavitation Bubble Interacting But Not Connected with Air Bubbles -- 3.2.2 Intensity of the Collapse Noise of a Cavitation Bubble Interacting and Connected with an Air Bubble -- 3.3 Direction-Changing Effect of an Air Bubble on the Collapse of a Cavitation Bubble -- 3.3.1 Direction-Changing Effect of an Air Bubble on the Collapse of a Cavitation Bubble -- 3.3.2 Direction-Changing Effect of an Air Bubble on a Cavitation Bubble Evolving Near a Wall -- 3.3.3 Combined Direction-Changing Effects of a Wall and an Air Bubble on the Collapse of a Cavitation Bubble -- 3.4 Retarding Effect of an Air Bubble on the Collapse Shock Wave of a Cavitation Bubble -- 3.4.1 Retarding Effect of an Air Bubble on the Collapse Shock Wave of a Cavitation Bubble -- 3.4.2 Impact Intensity of the Collapse Shock Wave of a Cavitation Bubble Interacting with an Air Bubble Near a Wall -- 3.5 Forced Aeration for Cavitation Erosion Protection of High-Head Dams -- 3.5.1 Mesoscale Mechanism of Forced Aeration -- 3.5.2 Design Principles of Forced-Aeration for Cavitation Erosion Protection Structures of High-Head Dams -- 3.6 Conclusions -- References -- 4 Mesoscale Analysis of Air-Water Two-Phase Flow -- 4.1 Background -- 4.2 Mesoscale Mechanism for Surface Aeration of High-Velocity Flows -- 4.2.1 Mesoscale Characteristics of the Free-Surface Shape of Flows -- 4.2.2 Mesoscale Free-Surface Aeration Process of Flows -- 4.2.3 Quantitative Analysis of the Free-Surface Aeration of Flows -- 4.3 Critical Condition for Surface Aeration of High-Velocity Flows -- 4.3.1 Critical Condition for Air Entrainment of Free-Surface Depressions in Flows -- 4.3.2 Air-Bubble Entrainment Characteristics of Free-Surface Depressions in Flows -- 4.3.3 Comparison of Calculated and Experimental Results.

4.4 Calculation of Concentration Distribution for Surface Aeration of High-Velocity Flows -- 4.4.1 Regional Characteristics of Surface Aeration in High-Velocity Flows -- 4.4.2 Comparison of the Calculated and Measured Values of the Ca Distribution in High-Velocity Aerated Flows -- 4.4.3 Diffusion Pattern of Ca Along the Course -- 4.5 Analysis of Depth and Concentration of Aerated Flows in Engineering Practice -- 4.5.1 Analysis of Self-Aerated Open-Channel Flows in Terms of Hm -- 4.5.2 Analysis of the Aerated Flow in the Spillway of the Jinping-I Hydropower Station -- 4.6 Conclusions -- References -- 5 Mesoscale Analysis of Flood Discharge and Energy Dissipation -- 5.1 Background -- 5.2 Vortex Structure of a Single Jet -- 5.2.1 Velocity Field Characteristics of a Single Jet -- 5.2.2 Vorticity Field Characteristics of a Single Jet -- 5.3 Vortex Structure with Multijets -- 5.3.1 Transverse Vortices -- 5.3.2 Vertical Vortices -- 5.4 Vortex Structure of a Pressure Flow with a Sudden Contraction -- 5.4.1 Flow Field Characteristics of a Pressure Flow with a Sudden Contraction -- 5.4.2 Vortex Blob Characteristics of a Pressure Flow with a Sudden Contraction -- 5.5 Application of Multihorizontal Submerged Jets in Engineering Project -- 5.5.1 Overview of the Project -- 5.5.2 Characteristics of the Flood Discharge and Energy Dissipation -- 5.6 Conclusions -- References -- 6 Mesoscale Analysis of Flood Discharge Atomization -- 6.1 Background -- 6.2 Jet Spallation in Air -- 6.2.1 Velocity Distribution of Jet-Spalled Water Droplets -- 6.2.2 Distribution of the Moving Directions of the Water Droplets Formed by Jet Spallation -- 6.3 Jet Collision in Air -- 6.3.1 Characteristics of the Water Droplets Formed by a Jet Collision in Air -- 6.3.2 Effects of the Flow-Rate Ratio on the Characteristics of the Water Droplets Formed by a Jet Collision.

6.3.3 Spallation Area of Jets After Collision in Air -- 6.4 Water Splash by Plunging Jets -- 6.4.1 Characteristics of the Water Droplets Splashed by a Jet -- 6.4.2 Motion Pattern of the Water Droplets Formed by the Splashing of Water with a High-Velocity Plunging Jet -- 6.5 Discussion of the Scale Effect in Flood Discharge Atomization Model Tests for High-Head Dams -- 6.5.1 Similarity Criterion for FDA Model Tests -- 6.5.2 Scale Effect in FDA Model Tests -- 6.6 Conclusions -- References -- 7 Mesoscale Analysis of Flash Flood and Sediment Disasters -- 7.1 Background -- 7.2 Sudden Stop and Accumulation of Sediment Particles After a Hydraulic Jump -- 7.3 Threshold Conditions for Combined Flash Flood and Sediment Disasters -- 7.4 Identification of Disaster-Prone Regions Based on the Threshold Conditions for Combined Flash Flood and Sediment Disasters -- 7.5 Analysis of Control Techniques Based on the Threshold Conditions for Combined Flash Flood and Sediment Disasters -- 7.6 Conclusions -- References.