除湿剂超声波再生技术 英文版【2025|PDF|Epub|mobi|kindle电子书版本百度云盘下载】

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1 Introduction1

1.1 Background1

1.2 Literature Reviews2

1.2.1 Desiccant Materials2

1.2.2 Types of Desiccant Dryer4

1.2.3 Regeneration Methods10

1.3 The Proposed Method19

1.3.1 Basic Knowledge about Ultrasound19

1.3.2 Sound Generation22

1.3.3 Fundamental Theory for Ultrasound-Assisted Regeneration24

1.4 Summary26

References26

2 Ultrasound-Assisted Regeneration of Silica Gel33

2.1 Theoretical Analysis33

2.2 Experimental Study38

2.2.1 Experimental Setup38

2.2.2 Procedure for Experiments39

2.2.3 Methods40

2.2.4 Results and Discussions42

2.3 Empirical Models for Ultrasound-Assisted Regeneration51

2.3.1 Model Overviews51

2.3.2 Model Analysis52

2.4 Theoretic Model for Ultrasound-Assisted Regeneration59

2.4.1 Physical Model62

2.4.2 Mathematical Model for Ultrasonic Wave Propagation62

2.4.3 Mathematical Model for Heat and Mass Transfer in Silica Gel Bed67

2.4.4 Model Validation75

2.4.5 Error Analysis for Experimental Data85

2.5 Parametric Study on Silica Gel Regeneration Assisted by Ultrasound89

2.5.1 Acoustic Pressure and Oscillation Velocity in the Packed Bed89

2.5.2 Thermal Characteristics of the Bed during Ultrasound-Assisted Regeneration91

2.5.3 Enhancement of Regeneration Assisted by Ultrasound106

2.5.4 Comparisons between the Transverse-and Radial-Flow Beds110

2.6 Quantitative Contribution of Ultrasonic Effects to Silica Gel Regeneration110

2.6.1 Theoretical Analysis110

2.6.2 Method113

2.6.3 Results and Discussions114

2.7 Energy-Saving Features of Silica Gel Regeneration Assisted by Ultrasound119

2.7.1 Specific Energy Consumption119

2.7.2 Results and Discussions120

2.7.3 Brief Summary125

2.8 Effects of Ultrasound-Assisted Regeneration on Desiccant System Performance126

2.8.1 Study Objective and Method126

2.8.2 Results and Discussions127

2.8.3 Brief Summary139

References139

3 Ultrasound-Assisted Regeneration for a New Honeycomb Desiccant Material141

3.1 Brief Introduction141

3.2 Experimental Study142

3.2.1 Experimental System142

3.2.2 Raw Material and Experimental Conditions142

3.2.3 Analysis Parameters144

3.2.4 Experimental Results145

3.2.5 Energy Attenuation and Absorptivity of Ultrasound in the Material154

3.3 Theoretical Model for Honeycomb-Type Desiccant Regeneration159

3.3.1 Basic Assumptions159

3.3.2 Governing Equations159

3.3.3 Determination of Key Parameters160

3.3.4 Model Validation161

3.4 Model Simulations and Analysis163

3.4.1 Parametric Study163

3.4.2 Quantitative Contributions of Ultrasonic Effects to the Regeneration of Honeycomb-Type Desiccant172

3.5 Summary176

References176

4 Ultrasound-Atomizing Regeneration for Liquid Desiccants177

4.1 Overview177

4.1.1 Principles and Features of the Liquid-Desiccant Dehumidification177

4.1.2 Thermo-Physical Properties of Liquid Desiccant Materials178

4.1.3 Research Status of Solution Regenerators182

4.2 Theoretical Analysis183

4.2.1 Mass Transfer Coefficients for the Droplets183

4.2.2 Atomized Size of Droplet by Ultrasonic Atomizing192

4.2.3 Droplet Distribution Characteristics and Measurement Techniques194

4.2.4 Vapor Pressure of Liquid Desiccant Mixture196

4.3 Theoretical Modeling for the Ultrasound-Atomizing Regenerator201

4.3.1 Assumptions201

4.3.2 Basic Equations201

4.3.3 Determination of Key Parameters202

4.3.4 Model Validation203

4.3.5 Parametric Study208

4.4 Performance Analysis of Liquid-Desiccant Dehumidification System with Ultrasound-Atomizing Regeneration221

4.4.1 The Ultrasound-Atomizing Regenerator versus the Packed One221

4.4.2 Performance of Liquid Desiccant System with Different Regenerators226

References233

5 Ultrasonic Transducers235

5.1 Longitudinal Vibration of Sandwich Piezoelectric Ultrasonic Transducer235

5.1.1 Overview235

5.1.2 Theoretical Analysis240

5.1.3 State Equations of Sandwich Piezoelectric Electromechanical Transducer248

5.1.4 Design Case256

5.2 Radial Vibration Ultrasonic Transducer258

5.2.1 Overview258

5.2.2 Theoretical Analysis and Design of a Binary Radial Transducer259

5.2.3 Radial Vibration Sandwich Piezoelectric Transducer267

5.2.4 Summary275

5.3 Ultrasonic Atomization Transducer275

5.3.1 Basic Principle of Ultrasonic Atomization275

5.3.2 Basic Structure of Ultrasonic Atomizers275

5.3.3 Research Status and Applications277

References281

6 Desiceant System with Ultrasonic-Assisted Regeneration283

6.1 For Solid-Desiccant System283

6.1.1 Based on the Longitudinal Vibration Ultrasonic Transducer283

6.1.2 Based on the Radial Vibration Ultrasonic Transducer284

6.2 For Liquid-Desiccant System287

6.3 Future Work289

6.3.1 Development of Ultrasonic Transducer289

6.3.2 Development of Desiccant Materials Adaptive to Ultrasound-Assisted Regeneration290

6.3.3 Development of Demister290

6.3.4 Environmental Impact290

References292

Appendix A Basic Equations for Properties of Common Liquid Desiccants293

A.1 Lithium Chloride(LiCl)293

A.2 Calcium Chloride(CaCl2)297

A.3 Lithium Bromide(LiBr)299

A.4 Vapor Pressure(Pa)302

A.5 Specific Thermal Capacity(J/(kg·°C))303

A.6 Density(kg/m3)303

A.7 Dynamic Viscosity(Pas)303

References306

Index307