Plasma Research Express最新文献_第10页

Study on the influences of the anode structures on the jet characteristics of a laminar plasma torch 阳极结构对层流等离子体炬射流特性影响的研究

Plasma Research Express Pub Date : 2020-02-19 DOI: 10.1088/2516-1067/ab6c85

Xiuquan Cao, Chao Li, Rundong He, Haoming Xu, Lin Chen, Bo Huang

{"title":"Study on the influences of the anode structures on the jet characteristics of a laminar plasma torch","authors":"Xiuquan Cao, Chao Li, Rundong He, Haoming Xu, Lin Chen, Bo Huang","doi":"10.1088/2516-1067/ab6c85","DOIUrl":"https://doi.org/10.1088/2516-1067/ab6c85","url":null,"abstract":"There are two types of direct current thermal plasma jet based on flow status: turbulent plasma jet and laminar plasma jet. Laminar plasma jet has more advantages for high-precision applications than turbulent jet. Previous researches have been done to study factors that influence the jet characteristics for particular applications. However, more researches should be done to understand the influences of the anode structures on the jet characteristics. Therefore, this paper aims to study the jet characteristics of the laminar plasma torch with different anode structures experimentally. The experimental setup and methods are explained in detail in section 2. Then, results with different anode structures are examined and discussed. The experimental results show that different anode structure results in different jet characteristics, which is beneficial for the design of the laminar plasma torch. To conclude, a bigger diameter of the anode is beneficial for obtaining a higher arc voltage and thermal efficiency, nevertheless, a medium jet length and an anode with a smaller diameter is not recommended because of the low jet length. Furthermore, an anode with semicircular grooves on the inner surface can generate a more stable and long laminar plasma jet with a lower arc voltage but more intense erosion.","PeriodicalId":36295,"journal":{"name":"Plasma Research Express","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/2516-1067/ab6c85","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45312232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Role of ponderomotive force in sustaining plasma discharge in a microwave induced plasma system 微波等离子体系统中质动势在维持等离子体放电中的作用

Plasma Research Express Pub Date : 2020-02-14 DOI: 10.1088/2516-1067/ab743a

P. Basu, H. Ramachandran

引用次数: 0

Kinetic Alfvén soliton structure with exchange-correlation potential in quantum plasma 量子等离子体中具有交换相关势的动力学alfvsamn孤子结构

Plasma Research Express Pub Date : 2020-02-10 DOI: 10.1088/2516-1067/ab7286

Nauman Sadiq, Mushtaq Ahmad

引用次数: 2

Electrical breakdown from macro to micro/nano scales: a tutorial and a review of the state of the art 电击穿从宏观到微/纳米尺度:教程和审查的艺术状态

Plasma Research Express Pub Date : 2020-02-07 DOI: 10.1088/2516-1067/ab6c84

Yangyang Fu, Peng Zhang, J. Verboncoeur, Xinxin Wang

{"title":"Electrical breakdown from macro to micro/nano scales: a tutorial and a review of the state of the art","authors":"Yangyang Fu, Peng Zhang, J. Verboncoeur, Xinxin Wang","doi":"10.1088/2516-1067/ab6c84","DOIUrl":"https://doi.org/10.1088/2516-1067/ab6c84","url":null,"abstract":"Fundamental processes for electric breakdown, i.e., electrode emission and bulk ionization, as well as the resultant Paschen’s law, are reviewed under various conditions. The effect of the ramping rate of applied voltage on breakdown is first introduced for macroscopic gaps, followed by showing the significant impact of the electric field nonuniformity due to gap geometry. The classical Paschen’s law assumes uniform electric field; a more general breakdown scaling law is illustrated for both DC and RF fields in geometrically similar gaps, based on the Townsend similarity theory. For a submillimeter gap, effects of electrode surface morphology with local field enhancement and electric shielding on the breakdown curve are discussed, including the most recent efforts. Breakdown characteristics and scaling laws in microgaps with both metallic and non-metallic (e.g., semiconductor) materials are detailed. For gap distance down to micro/nano scales, the breakdown characteristics and the breakdown mode transition from the secondary electron emission to the electric field emission or thermionic emission dominant regime. Additionally, the combined thermo-field emission regime is also reviewed. Previous efforts, including key simulations and experiments, have been devoted to diagnosing breakdown path evolution, measuring breakdown fields, and quantifying breakdown dependence on frequencies for gaps down to micro/nano scales. By summarizing and analyzing fundamental theories, recent progress, and on-going challenges, this tutorial review seeks to provide basic understanding and the state of the art of electric breakdown, which aids in advancing discoveries and promoting application prospects for discharge devices engineered in a wide range of regimes.","PeriodicalId":36295,"journal":{"name":"Plasma Research Express","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/2516-1067/ab6c84","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45369851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 53

Injection of intense low-energy reactor-based positron beams into a supported magnetic dipole trap 注入强低能反应堆为基础的正电子束到一个支持磁偶极子阱

Plasma Research Express Pub Date : 2020-01-30 DOI: 10.1088/2516-1067/ab6f44

J. Horn-Stanja, E. Stenson, M. Stoneking, M. Singer, U. Hergenhahn, S. Nißl, H. Saitoh, T. Pedersen, M. Dickmann, C. Hugenschmidt, J. Danielson

引用次数: 5

Discharge properties of helicon oxygen plasma in the source and expansion chambers 螺旋氧等离子体在源室和膨胀室中的放电特性

Plasma Research Express Pub Date : 2020-01-30 DOI: 10.1088/2516-1067/ab6f45

N. Sharma, M. Chakraborty, N. K. Neog, M. Bandyopadhyay

引用次数: 3

Electron cyclotron modes of Bernstein waves in different plasma environments 不同等离子体环境下伯恩斯坦波的电子回旋模式

Plasma Research Express Pub Date : 2020-01-20 DOI: 10.1088/2516-1067/ab69d8

W. Khan, M. Ali, Y. Habib

引用次数: 3

High-voltage pulsed plasma generation with frequency control for streamer initiation in liquid phase 采用频率控制的高压脉冲等离子体产生用于液相流光启动

Plasma Research Express Pub Date : 2020-01-20 DOI: 10.1088/2516-1067/ab69d7

V. Plotnikov, G. Diaz

引用次数: 1

Development of a substrate-invariant 2-D array of nanosecond-pulsed streamer discharges 衬底不变的纳秒脉冲流放电二维阵列的研制

Plasma Research Express Pub Date : 2020-01-13 DOI: 10.1088/2516-1067/ab640f

Matthew Burnette, D. Staack

引用次数: 0

Degradation of organic dye using plasma discharge: optimization, pH and energy 等离子体放电降解有机染料：优化、pH和能量

Plasma Research Express Pub Date : 2020-01-02 DOI: 10.1088/2516-1067/ab6703

A. Fahmy, A. El-Zomrawy, A. Saeed, Ahmed Z Sayed, Mohamed A Ezz El-Arab, H. Shehata, J. Friedrich

{"title":"Degradation of organic dye using plasma discharge: optimization, pH and energy","authors":"A. Fahmy, A. El-Zomrawy, A. Saeed, Ahmed Z Sayed, Mohamed A Ezz El-Arab, H. Shehata, J. Friedrich","doi":"10.1088/2516-1067/ab6703","DOIUrl":"https://doi.org/10.1088/2516-1067/ab6703","url":null,"abstract":"Decolorization of Acid Orange 142 (AO142) as important water pollutant was observed on the exposure of the dye solutions to an atmospheric non-thermal gas plasma. A response surface methodology (RSM) combined with a central composite design (CCD) was utilized to optimize the main factors (variables) affecting the degradation efficiency (response) of AO142, such as the applied voltage, the gap distance between the high voltage electrode and the surface of the solution. The regression analysis showed that a first-order polynomial model well fits the experimental data with a coefficient of determination R2 = 0.96. FT-IR, UV-vis, TOC and GC-MS measurements were used to investigate the decolorization of the dye on exposure to the plasma discharges. A possible degradation pathway was postulated. Additionally, the conductivity and pH changes during the treatment were also evaluated. The plasma treatment combined with Fe2+ (plasma Fenton reaction) exhibited a higher degradation efficiency, higher energy yield connected with lower energy consumption in comparison to the plasma treatment without Fe2+ addition.","PeriodicalId":36295,"journal":{"name":"Plasma Research Express","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/2516-1067/ab6703","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45172489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18