水平振动激励下颗粒物质的分布形态与对流模式研究
发布时间：2021-08-18 16:33
颗粒系统在水平振动作用下表现出复杂的现象,包括分离、对流与分布图案,对农业、采矿、制药、地质、土木工程等发展具有重要意义。以前的理论和实验工作大多研究了竖向振动的影响,较少探索水平振动对颗粒系统对流运动与分布模式的影响。在水平振动的颗粒系统中,影响颗粒运动与分布的重要因素主要包括颗粒粒径比、颗粒物性、能量输入、振动方向和边界条件等。在本文中,我们将分别研究水平振动作用下单组分颗粒体系单层床层、双组分颗粒体系单层床层与双组分颗粒体系多层床层中颗粒的对流运动与分布图案。首先,我们将总质量500g、粒径d=8.0 ± 0.2 mm的活性氧化铝球形颗粒放入正方形容器形成单组分颗粒体系的单层床层。容器边长LX=LY=25 cm,高LZ= 18 cm。在容器上施加水平振动,振动频率分别固定为5 Hz、10 Hz和15 Hz,无量纲振动加速度Γ=0.8～1.4。在实验中,我们发现单组分颗粒体系的单层床层在水平振动作用下形成了四种不同的密度分布区域,即固态区、团簇区、气态区和空区,以及颗粒从容器的一个角落跳起形成多层结构的3D状态。研究发现转动惯量I对颗粒系统的能量耗散和对流运动有重要的影响,且有I∝...
【文章来源】：北京科技大学北京市 211工程院校 教育部直属院校
【文章页数】：115 页
【学位级别】：博士
【文章目录】：
Acknowledgements
摘要
Abstract
1 Literature Review
1.1 Introduction
1.2 Convection in Horizontally Vibrated Granular Materials
1.3 Segregation in Horizontal Vibrated Systems
1.4 Pattern Formation in Horizontally Vibrated Granular Materials
1.5 Industrial Application of Granular matters
1.6 Thesis Outline
2 Experimental Apparatus and Techniques
2.1 Vibration Control System
2.1.1 Front-End Amber
2.1.2 Front board
2.1.3 Rear board
2.1.4 Camera
2.2 Particle Image Velocimetry(PIV)
3 Moment of Inertia and Energy Dissipation in Mono-Size Monolayer Particles System
3.1 States Observed in Monolayer System
3.1.1 State at 5 Hz
3.1.2 State at 10 Hz
3.1.3 State at 15 Hz
3.2 Region Formation in Monolayer Particles System
3.2.1 Regions at 5 Hz
3.2.2 Regions at 10 Hz
3.2.3 Regions at 15 Hz
3.3 Results Analysis
3.3.1 Energy Dissipation in the System
3.3.2 Effect of Moment of Inertia on Convection
3.4 Summary
4 Regions Development and Convection Modes in Mono-Size Monolayer Particles System
4.1 Regions Development and Convection Motion
4.1.1 Regions Development in Non-Convection Mode
4.1.2 Regions Development in Two Convection Rolls Mode
4.1.3 Regions Development in One Roll Clockwise Convection Mode
4.1.4 Regions Development in One Roll Counter-Clockwise Convection Mode
4.1.5 Regions Development in 3D State Mode
4.2 Regions Kinetic Energy Effects on Convection Mode
4.3 Summary
5 Stripe Formation and Convection Motion of Binary Monolayer Particles System
5.1 Phase Detected in the System
5.1.1 Evolution of Clusters
5.1.2 Formation of Stripe Patterns
5.1.3 One Convection Roll
5.1.4 Two Convection Rolls
5.1.5 Numerous Convection Rolls
5.2 Phase Development in System
5.2.1 Mechanisms Involved in the Evolution of Clusters
5.2.2 Mechanism of Stripe Pattern Formation
5.2.3 Mechanism of One Convection Roll
5.2.4 Mechanism of Two or More Convection Rolls
5.3 Summary
6 Convection Rolls and Individual Particles Movement of Binary Particles Deep Layer System
6.1 Convection Patterns
6.1.1 Convection Pattern at 5 Hz
6.1.2 Convection Pattern at 10 Hz
6.1.3 Convection Pattern at 15 Hz
6.1.4 Individual Particles Movements
6.2 Heap Position and Convection Rolls
6.3 Summary
7 Conclusions
References
Resume
学位论文数据集
本文编号：3350235
【文章来源】：北京科技大学北京市 211工程院校 教育部直属院校
【文章页数】：115 页
【学位级别】：博士
【文章目录】：
Acknowledgements
摘要
Abstract
1 Literature Review
1.1 Introduction
1.2 Convection in Horizontally Vibrated Granular Materials
1.3 Segregation in Horizontal Vibrated Systems
1.4 Pattern Formation in Horizontally Vibrated Granular Materials
1.5 Industrial Application of Granular matters
1.6 Thesis Outline
2 Experimental Apparatus and Techniques
2.1 Vibration Control System
2.1.1 Front-End Amber
2.1.2 Front board
2.1.3 Rear board
2.1.4 Camera
2.2 Particle Image Velocimetry(PIV)
3 Moment of Inertia and Energy Dissipation in Mono-Size Monolayer Particles System
3.1 States Observed in Monolayer System
3.1.1 State at 5 Hz
3.1.2 State at 10 Hz
3.1.3 State at 15 Hz
3.2 Region Formation in Monolayer Particles System
3.2.1 Regions at 5 Hz
3.2.2 Regions at 10 Hz
3.2.3 Regions at 15 Hz
3.3 Results Analysis
3.3.1 Energy Dissipation in the System
3.3.2 Effect of Moment of Inertia on Convection
3.4 Summary
4 Regions Development and Convection Modes in Mono-Size Monolayer Particles System
4.1 Regions Development and Convection Motion
4.1.1 Regions Development in Non-Convection Mode
4.1.2 Regions Development in Two Convection Rolls Mode
4.1.3 Regions Development in One Roll Clockwise Convection Mode
4.1.4 Regions Development in One Roll Counter-Clockwise Convection Mode
4.1.5 Regions Development in 3D State Mode
4.2 Regions Kinetic Energy Effects on Convection Mode
4.3 Summary
5 Stripe Formation and Convection Motion of Binary Monolayer Particles System
5.1 Phase Detected in the System
5.1.1 Evolution of Clusters
5.1.2 Formation of Stripe Patterns
5.1.3 One Convection Roll
5.1.4 Two Convection Rolls
5.1.5 Numerous Convection Rolls
5.2 Phase Development in System
5.2.1 Mechanisms Involved in the Evolution of Clusters
5.2.2 Mechanism of Stripe Pattern Formation
5.2.3 Mechanism of One Convection Roll
5.2.4 Mechanism of Two or More Convection Rolls
5.3 Summary
6 Convection Rolls and Individual Particles Movement of Binary Particles Deep Layer System
6.1 Convection Patterns
6.1.1 Convection Pattern at 5 Hz
6.1.2 Convection Pattern at 10 Hz
6.1.3 Convection Pattern at 15 Hz
6.1.4 Individual Particles Movements
6.2 Heap Position and Convection Rolls
6.3 Summary
7 Conclusions
References
Resume
学位论文数据集
本文编号：3350235
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