人体呼吸健康研究：N95过滤式面罩呼吸器的佩戴性能电子书

内容简介

Preface

01 Chapter 1 Introduction

1.1 Background

1.2 Motivation

1.3 Outline

02 Chapter 2 Study of the filtration performance of multi-fiber filters

2.1 Introduction

2.2 Model of multi-fiber filters

2.2.1 Geometric model and simulation method of multi-fiber filters

2.2.2 Model validation

2.3 Filtration efficiency and its optimization

2.3.1 Comparison of filtration performance between parallel and staggered designs

2.3.2 Filtration efficiency at different face velocities and particle diameters

2.3.3 Filtration performance of layered filters with the same total SVF

2.3.4 Optimization of pressure drop and filtration efficiency

2.4 Conclusion

References

03 Chapter 3 Studyofparticlerebound03anddepositiononfibersurface

3.1 Introduction

3.2 Models of flow field and particle movement

3.2.1 Flow field and particle movement

3.2.2 Particle rebound model

3.3 Particle transport and deposition

3.3.1 Effect of particle rebounds on particle deposition

3.3.2 Effects of face velocity on particle deposition

3.3.3 Effects of particle diameter on particle deposition

3.3.4 Filtration efficiency of a single fiber

3.4 Conclusion

References

04 Chapter 4 Investigation of the flow-field in the upper respiratory system when wearing N95 FFR

4.1 Introduction

4.2 Modeling of full breathing cycles

4.2.1 Flow field reverse modeling

4.2.2 CFD simulation of a full breathing cycle

4.3 Flow field of a full breathing cycle

4.3.1 Flow characteristics of a full breathing cycle

4.3.2 CO2 volume fraction

4.3.3 Temperature distribution inside FFR cavity

4.3.4 Pressure and wall shear stress inside upper respiratory airway

4.4 Discussion

4.5 Conclusion

References

05 Chapter 5 Investigation of water05vapor condensation on the innersurface of N95 FFR

5.1 Introduction

5.2 CFD modeling of water vapor condensation

5.2.1 Model of water vapor condensation

5.2.2 CFD-setup and boundary conditions of water vapor condensation

5.3 Water vapor condensation on the inner surface of N95 FFR

5.3.1 Effects of different environmental temperatures

5.3.2 Effects of different breathing velocities

5.3.3 Effects of different breathing frequencies

5.4 Discussion

5.5 Conclusion

References

06 Chapter 6 Effect of vapor06condensation on micro-climatein the deadspace of N95 FFR

6.1 Introduction

6.2 CFD modeling of vapor condensation

6.2.1 Model of vapor condensation

6.2.2 CFD-setup and boundary conditions of vapor condensation

6.2.3 FFR performance and vapor condensation distribution

6.3 Experiment of micro-climate inside N95 FFR

6.3.1 Experiment of temperature and relative humidity measuring inside FFR

6.3.2 Experiment of bacteria accounting on the inner surface of FFR

6.4 Conclusion

References

07 Chapter 7 Investigationofmovement characteristicsandrespiratorydepositionofindoorcigaretteparticles

7.1 Introduction

7.2 Model of particle movement and respiratory deposition

7.2.1 Description of room,human and particles system

7.2.2 CFD model of cigarette particles deposition

7.2.3 PM2.5 measurement

7.3 Flow field and cigarette particles deposition

7.4 Conclusion

References

08 Chapter 8 An improved FFR08design with a ventilation fan:CFD simulation and validation

8.1 Introduction

8.2 Improved FFR design and CFD simulation

8.2.1 Improved FFR design

8.2.2 Simulation method of flow field in FFR

8.3 Performance of the ventilation fan and its effects

8.3.1 Flow characteristics of the ventilation fan

8.3.2 Effects of fan orientation

8.3.3 Experiment on temperature of headform and FFR

8.4 Conclusion

References

09 Chapter 9 Design of the FFRwith an intelligent control fan

9.1 Introduction

9.2 Improved FFR design

9.3 Design of intelligent control system

9.4 Test results of FFR performance

9.5 Discussion

9.6 Conclusion

References

10 Chapter 10 Study of contact10characteristics between a respirator and a headform

10.1 Introduction

10.2 Modelsandmethodsofcontactcharacteristics between a respirator and a headform

10.2.1 Geometric models of headform and respirator

10.2.2 Simulation methods of contact characteristics

10.3 Contact characteristics between a respirator and a headform

10.4 Conclusion

References

11 Chapter 11 The effects of facialexpressions on respirators fit

11.1 Introduction

11.2 Models and methods of facial expressions

11.2.1 FE models of the headfrom and respirator

11.2.2 Simulation methods of facial expressions

11.3 Effects of facial expressions on respirators fit

11.4 Conclusion

References

12 Chapter 12 Customized design12and 3D printing of face seal foran N95 FFR

12.1 Introduction

12.2 Design,manufacture and test of customized face seals

12.2.1 3D laser scanning of human headform

12.2.2 Customized design of FFR face seal

12.2.3 3D printing of the FFR face seal

12.2.4 Experiment setup and procedures

12.3 Contact characteristics between the FFR and headform

12.4 Discussion

12.5 Conclusion

References