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Two Dimensional Numerical Study Of An Atmospheric Pressure Helium Plasma Jet With Dual Power Electrodeproject Supported By The National Natural Science Foundation Of China Grant Nos 10775026 11275042 11305026 And 11405042
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Book Synopsis Two-dimensional Numerical Study of an Atmospheric Pressure Helium Plasma Jet with Dual-power Electrode*Project Supported by the National Natural Science Foundation of China (Grant Nos. 10775026, 11275042, 11305026, and 11405042). by :
Download or read book Two-dimensional Numerical Study of an Atmospheric Pressure Helium Plasma Jet with Dual-power Electrode*Project Supported by the National Natural Science Foundation of China (Grant Nos. 10775026, 11275042, 11305026, and 11405042). written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: In this paper, the characteristics of an atmospheric pressure helium plasma jet generated by a dual-power electrode (DPE) configuration are investigated by using a two-dimensional fluid model. The effect of a needle electrode on the discharge is studied by comparing the results of the DPE configuration with those of the single ring electrode configuration. It is found that the existence of the needle leads to the generation of a helium plasma jet with a higher propagation velocity, higher species density, and larger discharge width. Furthermore, the influences of the needle radius and needle-to-ring discharge gap on the generation of a plasma jet are also studied. The simulation results indicate that the needle electrode has an evident influence on the plasma jet characteristics.
Book Synopsis A Two-dimensional Model of He/O2 Atmospheric Pressure Plasma Needle Discharge*Project Supported by the National Natural Science Foundation of China (Grant No. 11465013), the International Science and Technology Cooperation Program of China (Grant No. 2015DFA61800), and the Natural Science Foundation of Jiangxi Province, China (Grant No. 20151BAB212012). by :
Download or read book A Two-dimensional Model of He/O2 Atmospheric Pressure Plasma Needle Discharge*Project Supported by the National Natural Science Foundation of China (Grant No. 11465013), the International Science and Technology Cooperation Program of China (Grant No. 2015DFA61800), and the Natural Science Foundation of Jiangxi Province, China (Grant No. 20151BAB212012). written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: In this paper, a computational modeling study of stream propagation in the atmospheric-pressure helium plasma in ambient atmosphere (oxygen) is presented. A coupled fluid model between time-dependent plasma dynamics and steady state neutral gas flow is employed to provide a fundamental insight into the evolution of the streamers. The obtained simulation results showing that the sheath forms near the dielectric surface and shields the axial stream propagation. The stream front propagates with axial velocity in a range of 10 4 m/s–10 5 m/s. And, the increasing accumulated surface charge should be responsible for reducing the propagation velocity of the streamer front in the axial direction. Besides, when the gas flow rate is 1.1 standard liter per minute (SLM), we find that the concentration of oxygen drastically increases at a larger radial position near a treated surface. Therefore, Penning ionization by helium metastables and oxygen peaks at an off-axis position, corresponding to the ring-shaped emission profile in cylindrical coordinates. In this case, the simulated results show the ring-shaped ground atomic oxygen density profile near the treated surface ( z = 0.5 mm) at a large gas flow rate of 1.1 SLM, which is consistent with the observation in a similar experiment.
