臺灣博碩士論文加值系統

Dielectric barrier discharges have drawn interest in numerous fields ascribing to the potential of producing diverse reactive species. Among them, OH species is reported to play important roles in assisting combustion, inducing apoptosis of cancer cells, and modifying the skin generation process, to mention a few. Therefore, this work is devoted to investigating the discharge physics and chemical kinetics of OH species in an atmospheric pressure helium dielectric barrier discharge containing H2O by a plasma fluid model. The simulated OH densities under various mixtures ranging from 0.4% to 2.0% H2O are compared with the densities measured by an ultraviolet absorption spectroscopy system and a saturation of OH densities is discovered in the cases of higher H2O concentrations both experimentally and numerically. The chemical model contains 32 species involving the large mass clustering group of water and 102 reaction channels are taken into account. The major OH species generating mechanism is observed to be the dissociative electron impact reaction (e + H2O → e + OH + H), producing roughly 52% of the OH species at 0.8% H2O. Furthermore, the dissociative electron attachment (e + H2O → H- + OH) is discovered to contribute to roughly 11% of the total yield of OH species. That is, the electron impact reactions generate up to 63% of the species. Subsequently, the simulated results show that the self-recombination of OH species and combination of OH and H are the dominant consumption mechanisms, depleting up to 38% and 20% of the OH species respectively. Since the electron is found to be essential in OH species production, the mechanisms of the electron are studied in the research. The critical role of H in the OH consumption and the abundant charged species in He/H2O discharge are also investigated. Additionally, the ionic water clusters H+(H2O)5 and OH-(H2O)2 are discovered to be the most abundant positively charged species and negatively charged species in the discharge and their reaction pathways are presented. The saturation of OH density at high H2O concentrations is observed and discussed.

Abstract i
Table of Contents iii
List of Figures v
List of Tables vii
1. Introduction 1
1.1 Research background 1
1.2 Research motivation 7
1.3 Literature review 8
1.4 Research objectives 16
2. Methodology 17
2.1 Plasma fluid model 17
2.2 Governing equations 19
2.3 Boundary conditions 22
2.4 Chemical model 25
2.5 Procedures for solving the plasma fluid model 31
3. Results and Discussion 33
3.1 Model validation 33
3.1.1 Uniformity 33
3.1.2 Discharge characteristics (IV curves) 34
3.1.3 OH density at various H2O concentrations 35
3.2 OH mechanism analysis 38
3.3 Electron mechanism analysis 40
3.4 H mechanism analysis 42
3.5 The abundant negative ion and the reaction pathway 44
3.6 The abundant positive ion and the reaction pathway 45
3.7 The transition of the current densities and OH species saturation 47
4. Conclusions 49
5. Future works 53
References 54

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