| 摘要 | 第5-8页 |
| ABSTRACT | 第8-10页 |
| ACKNOWLEDGEMENT | 第11-12页 |
| DEDICATION | 第12-25页 |
| SYMBOLS AND ABBREVIATIONS | 第25-27页 |
| CHAPTER 1 INTRODUCTION AND OBJECTIVES | 第27-34页 |
| 1.1 The dual-feed rotor spinning concept | 第27页 |
| 1.2. Main features of the dual-feed rotor spinning unit | 第27-28页 |
| 1.3 Rotor spinning airflow characteristics | 第28-29页 |
| 1.4 Computational fluid dynamics | 第29-30页 |
| 1.5 Research objectives | 第30-31页 |
| 1.6 Procedures | 第31页 |
| 1.7 Thesis outline | 第31-34页 |
| CHAPTER 2 LITERATURE REVIEW | 第34-59页 |
| 2.1 Introduction | 第34页 |
| 2.2 Background and previous work | 第34-42页 |
| 2.2.1 Theoretical and experimental studies of 3-D air flows | 第40-41页 |
| 2.2.2 Numerical modelling of fibre suspension flows | 第41-42页 |
| 2.3 Characterization of 3-D airflow dynamics | 第42-43页 |
| 2.4 Characterization of flow domain of the rotor spinning unit | 第43-50页 |
| 2.4.1 Dimensional characteristics | 第44-47页 |
| 2.4.1.1 The rotor diameter | 第44-45页 |
| 2.4.1.2 The rotor slide wall angle | 第45-46页 |
| 2.4.1.3 The transfer channel dimensional characteristics | 第46页 |
| 2.4.1.4 Other geometrical dimensional characteristics | 第46-47页 |
| 2.4.2 Flow and spinning condition characteristics of the rotor spinning unit | 第47-50页 |
| 2.4.2.1 Velocity analysis | 第48页 |
| 2.4.2.2 Negative pressure | 第48页 |
| 2.4.2.3 Vortical structures and Streamlines | 第48-49页 |
| 2.4.2.4 Rotor speed | 第49-50页 |
| 2.5 Characterization of turbulence and Reynolds number | 第50-52页 |
| 2.6. Overview of turbulence models | 第52-54页 |
| 2.6.1 Classification of turbulent models | 第52-54页 |
| 2.6.1.1 Reynolds-Averaged Navier-Stokes (RANS) Models | 第52-53页 |
| 2.6.1.2 Computation of fluctuating quantities | 第53-54页 |
| 2.7 Turbulence models | 第54-57页 |
| 2.7.1 Three main types of turbulence models | 第55-56页 |
| 2.7.2 Options for k-? model | 第56-57页 |
| 2.8 Summary | 第57-59页 |
| CHAPTER 3 MODEL SET-UP | 第59-72页 |
| 3.1 Introduction | 第59页 |
| 3.2 Numerical methods and solution approach | 第59-63页 |
| 3.2.1 Model selection | 第59-63页 |
| 3.3 Geometrical model construction | 第63-65页 |
| 3.4 Meshing and refinement | 第65-66页 |
| 3.5 Boundary conditions | 第66-68页 |
| 3.6 Numerical process and solution strategy | 第68-69页 |
| 3.7 Numerical code validation and grid independence test | 第69页 |
| 3.8 Experimental Procedures for model verification | 第69-71页 |
| 3.9 Summary | 第71-72页 |
| CHAPTER 4 RESULTS ON THE AIRFLOW DYNAMICS IN THE DUAL-FEED ROTOR SPINNING SYSTEM | 第72-87页 |
| 4.1 Overview of key parameters | 第72页 |
| 4.2 The distribution of pressure and velocity vector in the rotor of the dual-feed model | 第72-74页 |
| 4.3 Effect of velocity variation at inlet 1 and inlet 2 | 第74-76页 |
| 4.4 The pressure-velocity relationship along the rotor wall | 第76-78页 |
| 4.5 Turbulence-air velocity relationship in the rotor interior | 第78-79页 |
| 4.6 Dual-feed and conventional rotor spinning system comparison | 第79-83页 |
| 4.7 Results of simulation verification | 第83-84页 |
| 4.8 Verification of pressure along the vertical position of rotor axis | 第84-86页 |
| 4.9 Summary | 第86-87页 |
| CHAPTER 5 FINITE VOLUME ANALYSIS OF THE AIR FLOW FIELD IN THE DUAL-FEED AND CONVENTIONAL ROTOR SPINNING UNIT | 第87-103页 |
| 5.1 Introduction | 第87页 |
| 5.2 Differences between the dual-feed and conventional rotor spinning systems | 第87-88页 |
| 5.3 Theoretical and mathematical model | 第88页 |
| 5.4 Structure and computational airflow domain | 第88-90页 |
| 5.5 Evaluation of velocity contours in the single and the dual-feed rotor spinning units | 第90-92页 |
| 5.6 An account for vortices inside the rotor of the two spinning systems | 第92-93页 |
| 5.7 Evaluation and comparison of negative pressures | 第93-96页 |
| 5.8 A comparison of drag force in the novel dual-feed and single feed components | 第96-98页 |
| 5.9 Comparison of yarns properties made on a dual-feed and a conventional rotor spinning units | 第98-101页 |
| 5.10 Summary | 第101-103页 |
| CHAPTER 6 EXPERIMENTS ON THE DUAL-FEED ROTOR SPINNING UNIT | 第103-126页 |
| 6.1 Introduction | 第103页 |
| 6.2 Comparison of cotton viscose blended yarns spun on two systems | 第103-105页 |
| 6.3 Methods | 第105-106页 |
| 6.4 Tenacity, elongation and hairiness of cotton/viscose yarn samples | 第106-107页 |
| 6.5 Evenness results of cotton/viscose yarn samples | 第107-108页 |
| 6.6 Investigation of the dual-sliver opening mechanism | 第108-124页 |
| 6.6.1 Materials and methods | 第109-113页 |
| 6.6.2 Analysis of hairiness, tenacity and elongation of a polyester/cotton dual-feed blend yarn for different samples. | 第113-117页 |
| 6.6.3 Unevenness of cotton/polyester yarns | 第117-121页 |
| 6.6.4 Analysis of the effect of opening direction | 第121页 |
| 6.6.5 SEM images of cotton/polyester yarn samples | 第121-124页 |
| 6.7 Summary | 第124-126页 |
| CHAPTER 7 CONCLUSIONS AND FUTURE WORKS | 第126-129页 |
| 7.1 Conclusions | 第126-127页 |
| 7.2 Future Works | 第127-129页 |
| REFERENCES | 第129-138页 |
| LIST OF PUBLICATIONS | 第138-141页 |
| APPENDICES | 第141-154页 |
| Appendix 1 | 第141-151页 |
| Appendix 2 | 第151-154页 |
