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Mesoscale Modeling and CFD Simulation of Gas-fluidized Bed with Binary Particle Mixture

摘要第5-7页
ABSTRACT第7-8页
CHAPTER 1 INTRODUCTION第13-29页
    1.1 LITERATURE REVIEW第13-16页
    1.2 TYPICAL CHALLENGES IN LOW-VELOCITY FLUIDIZATION第16-21页
        1.2.1 Heterogeneous structures第16-17页
        1.2.2 Characteristics of bubbles第17-18页
        1.2.3 Bubble size第18-19页
        1.2.4 Bubble velocity第19-20页
        1.2.5 Fluidization of binary particles第20-21页
    1.3 MODELING APPROACHES第21-26页
        1.3.1 Direct Numerical Simulation第21-22页
        1.3.2 Discrete Particle Method第22页
        1.3.3 Multi-fluid model第22-23页
        1.3.4 Governing equations第23-24页
        1.3.5 Drag force第24-26页
    1.4 OBJECTIVES AND OUTLINE第26-29页
CHAPTER 2 NUMERICAL EXPERIMENT ON GAS-SOLID FLUIDIZATION第29-43页
    2.1 INTRODUCTION第29-30页
    2.2 SIMULATIONS OF A PERIODIC DOMAIN第30-38页
        2.2.1 Simulation settings第31-32页
        2.2.2 Results and discussions第32-34页
        2.2.3 Solid velocity distribution in different local position第34-36页
        2.2.4 Effects of pressure drop on solid velocity distribution第36-38页
    2.3 EXPERIMENTAL DATA FOR THE SIMULATION OF A BUBBLING FLUIDIZED BED第38-42页
        2.3.1 Simulation settings第39-40页
        2.3.2 Results and discussions第40-42页
    2.4 SUMMARY第42-43页
CHAPTER 3 PARAMETER ANALYSIS OF EMMS/BUBBLING MODEL FOR MONODISPERSE SYSTEM第43-59页
    3.1 INTRODUCTION第43页
    3.2 EMMS/BUBBLING MODEL FOR MONODISPERSE SYSTEM第43-45页
        3.2.1 Multi-scale description第43-45页
        3.2.2 Hydrodynamic equations第45页
    3.3 EFFECTS OF BUBBLE SIZE第45-54页
        3.3.1 Different bubble size correlations第46-48页
        3.3.2 Effects of bubble size correlation on structural parameters第48-52页
        3.3.3 Effects of bubble size correlation on H_d第52-54页
    3.4 DISCUSSION ON STRUCTURAL PARAMETERS第54-57页
        3.4.1 The volume fraction of dense phase and the dense phase voidage第54-55页
        3.4.2 Gas velocities in dense and dilute phases第55-56页
        3.4.3 Acceleration term第56-57页
        3.4.4 Variation of Nst with voidage第57页
    3.5 SUMMARY第57-59页
CHAPTER 4 EXTENDING THE EMMS/BUBBLING MODEL TO THE BINARY MIXTURE:FORMULATION AND STEADY-STATE VALIDATION第59-71页
    4.1 INTRODUCTION第59-60页
    4.2 EMMS/BINARY BUBBLING MODEL第60-66页
        4.2.1 Multiscale resolution第60-64页
        4.2.2 Hydrodynamic equations for steady state第64-65页
        4.2.3 Numerical Method第65-66页
    4.3 MODEL VALIDATION FOR STEADY STATE第66-70页
        4.3.1 Validation for monodisperse system第66-68页
        4.3.2 Validation for binary particle system第68-70页
    4.4 SUMMARY第70-71页
CHAPTER 5 EMMS/ BINARY DRAG MODEL AND PARAMETER ANALYSIS第71-85页
    5.1 INTRODUCTION第71-72页
    5.2 MODEL DESCRIPTION第72-77页
        5.2.1 Hydrodynamic equations for unsteady state:第72-74页
        5.2.2 Structure-dependent drag coefficient第74页
        5.2.3 Solution scheme第74-77页
    5.3 PARAMETER ANALYSIS第77-84页
        5.3.1 The model input parameters第77-78页
        5.3.2 Sensitivity analysis第78页
        5.3.3 Effects of the assumption of particles inside bubbles第78-81页
        5.3.4 Effects of the assumption for equal accelerations第81-84页
    5.4 SUMMARY第84-85页
CHAPTER 6 VALIDATION OF THE EMMS/BINARY DRAG MODEL第85-109页
    6.1 INTRODUCTION第85页
    6.2 EXPERIMENTAL DESCRIPTION第85-88页
        6.2.1 The case of size segregation第85-87页
        6.2.2 The case of combined size and density segregation第87-88页
    6.3 MATHEMATICAL MODEL第88-94页
        6.3.1 Conservation equations第89页
        6.3.2 Constitutive relations第89页
        6.3.3 The KTGF-based solid stress第89-91页
        6.3.4 The gas-solid drag force第91-94页
        6.3.5 The solid-solid drag force第94页
        6.3.6 The determination of maximum packing Limit第94页
    6.4 SIMULATION SETTINGS第94-96页
    6.5 RESULTS AND DISCUSSION第96-107页
        6.5.1 Simulation of Case 1第96-97页
        6.5.2 Voidage distribution第97-99页
        6.5.3 Solid concentration for flotsam and jetsam第99-100页
        6.5.4 Solid velocity第100-101页
        6.5.5 Axial profile of jetsam第101-102页
        6.5.6 Simulation of Case 2第102页
        6.5.7 Voidage distribution第102-104页
        6.5.8 Solid concentration for flotsam and jetsam第104-105页
        6.5.9 Solid velocity第105-106页
        6.5.10 Axial profile of jetsam第106-107页
    6.6 SUMMARY第107-109页
CHAPTER 7 CONCLUSIONS AND PROSPECTS第109-111页
LIST OF ABBREVIATIONS第111-115页
REFERENCES第115-131页
CURRICULUM VITAE第131-132页
ACKNOWLEDGEMENT第132页

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