A Modified Cfd-Based Sand Erosion Prediction Procedure for Pipe Elbows and Similarity Analyses on Erosion Tests

声明

ABSTRACT

TABLE OF CONTENTS

NOMENCLATURE

CHAPTER Ⅰ INTRODUCTION

1．1 Background

1．1．1 General Deseription of Multiphase Pipe Flows

1．1．2 General Description of Sand Particle Erosion

1．2 Literature Review

1．2．1 Mechanical Studies on Film Thickness of Annular Flow

1．2．2 Mechanical Studies on Sand Particle Erosion

1．3 Research Goals and Innovations

1．4 Outline of the Dissertation

CHAPTER Ⅱ MECHANICAL MODEL OF LIQUID FILM MOVEMENTS IN PIPE ELBOWS FOR ANNULAR FLOW

2．1 Introduction

2．2 validations and Treatments

2．2．1 Validation of Boundary Conditions at the Inlet

2．2．2 Assumptions and Treatments on the Film Behaviors in Elbows

2．3 Mechanical Model of Film Movements in Elbows

2．3．1 FiIm Movement in the Axial Direction

2．3．2 Film Movement in the Radial Direetion

2．3．3 Circumferential Distribution of Film Thickness

2．4 Verification

2．5 Parametric Studies

2．6 Concluding Remarks

CHAPTER Ⅲ MODIFIED CFD-BASED EROSION PREDICTION PROCEDURE OF ELBOWS FOR GAS，GAS-MIST AND ANNULAR FLOWS

3．1 Introduction

3．2 CFD-Based Erosion Prediction Procedure

3．2．1 Assumptions and Treatments

3．2．2 Flow Field Simulation

3．2．3 Particle Tracking in the Core Region

3．2．4 Particle-Wall Impact Behavior and Erosion Calculation

3．2．5 Meshing

3．3 Validation of the Turbulence Models

3．3．1 Investigation on the Velocity Profile

3．3．2 Investigation on the Static Pressure

3．4 Discussion on Numerical Settings

3．4．1 Investigation on the Particle Number

3．4．2 Investigation on the Grid Density

3．5 Concluding Remarks

CHAPTER Ⅳ VERIFICATION OF THE MODIFIED EROSION PREDICTION PROCEDURE

4．1 Introduction

4．2 Verification of the Erosion Prediction Procedure

4．2．1 Investigation on the Penetration Rate and Maximum Erosion Position

4．2．2 Investigation on the Penetration Rate Profile

4．3 Comparison between the Procedure and Empirical or Semi-Empirical Models

4．3．1 Investigation for Gas Flow Condition

4．3．2 Investigation for Gas-Mist Flow Condition

4．3．3 Investigation for Annular Flow Condition

4．3．4 Discussion on the CFD Procedure and the Empirical or Semi-Empirical Models

4．4 Concluding Remarks

CHAPTER Ⅴ SIMILARITY CRITERIA OF THE SOLID PARTICLE EROSION IN ELBOWS BETWEEN MODEL EXPERIMENTS AND ENGINEERING FOR DRY GAS AND GAS-MIST FLOWS

5．1 Introduction

5．2 Similarity Criteria

5．2．1 Assumptions and Treatments

5．2．2 Similarity Criteria

5．3 Verification of the Similarity Criteria

5．4 Concluding Remarks

CHAPTER Ⅵ SUMMARY AND CONCLUSIONS

6．1 Summary of the Present Work

6．2 Main Conclusions

6．3 Remarks on the Future Study

APPENDIX

REFERENCES

LIST OF PUBLICATIONS

ACKNOWLEDGEMENTS