Dynamically structured flow in pulsed fluidised beds / / Kaiqiao Wu

• Record Nr.: UNINA9910483999503321
• Autore: Wu Kaiqiao
• Pubbl/distr/stampa: Cham, Switzerland : , : Springer, , [2021]; ©2021
• ISBN: 3-030-68752-X
• Descrizione fisica: 1 online resource (172 pages)
• Collana: Springer Theses
• Disciplina: 660.284292
• Soggetti: Fluid dynamics; Gas-solid interfaces; Fluidization
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Nota di contenuto: Intro -- Supervisor's Foreword -- Abstract -- Acknowledgements -- Impact Statement -- Contents -- 1 Introduction -- 1.1 Granular Flow and Fluidisation -- 1.2 Challenges to Engineering of Fluidised Beds -- 1.3 Multi-scale Modelling of Gas-Solid Flows -- 1.3.1 Discrete Element Model -- 1.3.2 Two-Fluid Model -- 1.4 Methods for Structuring Bed Hydrodynamics -- 1.5 Dynamic Patterns in Shallow Granular Layers -- 1.5.1 Vibro-Driven Patterns -- 1.5.2 Modelling of Pattern Formation in Vibrated Layers -- 1.5.3 Gas-Driven Patterns -- 1.5.4 Modelling of Pattern Formation in Pulsed Layers -- 1.6 Origin of Bubble Patterns in Pulsed Fluidised Beds -- 1.7 Thesis Objectives and Outline -- References -- 2 Bubbling Properties in Pulsed Fluidised Beds -- 2.1 Introduction -- 2.2 Experimental Implementation and Analysis Methodology -- 2.2.1 Design of Quasi-2D Fluidised Bed Setup -- 2.2.2 Generation of Oscillatory Gas Flow -- 2.2.3 Gas Distribution -- 2.2.4 Particle Properties -- 2.2.5 Image Analysis -- 2.3 Results and Discussion -- 2.3.1 Validation of Gas Distribution -- 2.3.2 Impacts of Pulsed Flow on Bubbling Properties -- 2.3.3 Influence of Structuring on Flow Properties -- 2.3.4 Discussion -- 2.4 Conclusions -- References -- 3 A Structuring Regime to Control Bubbling Beds -- 3.1 Introduction -- 3.2 Experimental Implementation and Analysis Methodology -- 3.2.1 Pattern Intensity -- 3.2.2 ; Measurement of Bubble Properties -- 3.3 Results and Discussion -- 3.3.1 Impact of Flow Conditions on Pattern Intensity -- 3.3.2 Impact of Bed Height on Pattern Intensity -- 3.3.3 Correlation Between Pattern Intensity and Flow Properties -- 3.3.4 Discussion -- 3.4 Conclusions -- References -- 4 Modelling Dynamically Structured Fluidisation -- 4.1 Introduction -- 4.2 Model Implementation -- 4.2.1 Governing Equations and Closures of Two-Fluid Model.; 4.2.2 Governing Equations of Discrete Element Model -- 4.2.3 Interphase Momentum Exchange -- 4.2.4 Experimental Implementation -- 4.2.5 Computational Setup and Numerical Implementation -- 4.2.6 Analysis Methodology -- 4.3 Results and Discussion -- 4.3.1 Experimental and Computational Bed Dynamics -- 4.3.2 Description of the Bed Dynamics During a Patterned State -- 4.3.3 Modelling Larger Pulsed Beds Using Two-Fluid Models -- 4.3.4 Discussion -- 4.4 Conclusions -- References -- 5 The Role of Solid Mechanics in Stabilising Structured Flows -- 5.1 Introduction -- 5.2 Experimental Implementation -- 5.3 Numerical Implementation -- 5.4 Bubble Recognition and Analysis -- 5.5 Results and Discussion -- 5.5.1 Appearance of Structured Bubble Patterns -- 5.5.2 Evolution of Single-Array Bubble Patterns -- 5.5.3 Evolution of Double-Array Bubble Patterns -- 5.5.4 Flow Behaviour of Frictionless Particles in Pulsed Beds -- 5.5.5 Flow Behaviour of Frictional Particles in Pulsed Beds -- 5.5.6 Discussion -- 5.6 Conclusions -- References -- 6 Conclusions -- Appendix A -- A.1 Experimental Quasi-2D Fluidised Bed -- A.2 Gas Flow Calibration Setup -- A.3 Gas Supply Setup -- Appendix B -- B.1 Regularity of Triangle Tessellation -- B.2 Regularity of Bubble Pattern -- Appendix C -- Notation -- References.