本专著对循环流化床（CFB）提升管及不同气力输送系统中的气固流动进行了数值研究。使用了三种不同的数值方法对于密相气力输送进行了一系列仿真研究，主要内容如下：1、工业规模循环流化床提升管的粗颗粒CFD-DEM仿真模拟研究。2、长距离密相气力输送系统（LHD）的双流体模型（TFM）以及CFD-DEM仿真模拟研究。3、挡板型变径管道气力输送系统的设计以仿真模拟研究。4、双套管气力输送系统中气相和固相流动机理的仿真模拟研究：首次对新型双套管气力输送系统中的气固两相流进行了CFD-DEM研究。

Chapter 1 Background
Chapter 2 Literature Survey
2.1 Introduction
2.2 Complex pipe systems
2.2.1 Industrial scale circulating fluidized bed (CFB)
2.2.2 Long-distance high-pressure dense-phase (LHD) pneumatic conveying system
2.2.3 Bypass pneumatic conveying system
2.3 Numerical methods
2.3.1 Two fluid model (TFM)
2.3.2 Discrete element method (DEM)
2.3.3 Coupling of DEM and CFD
2.3.4 Coarse-grained (CG) /parcel CFD-DEM approach
2.4 Summary and proposed research
Chapter 3 Simulation of Industrial Scale CFB Using Coarse Grained CFD-DEM Model
3.1 Introduction
3.2 Experiments and simulation conditions
3.2.1 Backgrounds
3.2.2 Experimental set up and measurements
3.2.3 Mathematical model
3.2.4 Simulation conditions
3.3 Results and discussion
3.3.1 Axia] pressure gradient
3.3.2 Solid velocity and concentration
3.3.3 Particle cluster and solids back mixing
3.3.4 Analysis of the interaction forces
3.3.5 Effects of different model particle sizes
3.3.6 Effects of different solid mass flow rate
3.4 Conclusions
Chapter 4 Computational Study of Gas-solid Flow in LHD Pneumatic Conveying Systems
4.1 Introduction
4.2 Mathematical model
4.2.1 TFM
4.2.2 CFD-DEM
4.3 Simulation conditions
4.4 Model validation
4.5 Results and discussion
4.5.1 Pressure drop
4.5.2 Gas velocity
4.5.3 Solid velocity
4.5.4 Forces governing the motion of solids
4.6 Conclusions
Chapter 5 Numerical Study of Gas-solid Flow in Stepped Pipe with Inserts
5.1 Introduction
5.2 Mathematical model
5.2.1 TFM
5.2.2 CFD-DEM
5.3 Simulation conditions
5.4 Results and discussion
5.4.1 Single pipe with inserts
5.4.2 Stepped pipe with inserts
5.4.3 Different shape of inserts
5.5 Conclusions
Chapter 6 Particle-scale Modelling of Gas-solid Flow in Bypass System
6.1 Introduction
6.2 Mathematical model
6.3 Simulation conditions
6.4 Results and discussion
6.4.1 Grid study
6.4.2 Pressure drop
6.4.3 Gas velocity
6.4.4 Solid velocity and general flow pattern
6.4.5 Forces governing particle motion
6.5 Conclusions
Chapter 7 Effects Geometrical Parameters on the Gas-solid Flow in Bypass System
7.1 Introduction
7.2 Simulation method
7.3 Simulation conditions
7.4 Results and discussion
7.4.1 Effect of flute spacing
7.4.2 Effect of small internal pipe diameters
7.4.3 Effect of orifice path diameter
7.5 Conclusions
Chapter 8 Summary and Future Work
8.1 Summary
8.2 Future work
References