PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Simulation of nanoparticle coagulation in radio-frequency C2H2/Ar microdischarges |
Xiang-Mei Liu(刘相梅), Qi-Nan Li(李奇楠), Rui Li(李瑞) |
School of Science, Qiqihar University, Qiqihar 161006, China |
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Abstract The nanoparticle coagulation is investigated by using a couple of fluid models and aerosol dynamics model in argon with a 5% molecular acetylene admixture rf microdischarges, with the total input gas flow rate of 400 sccm. It co-exists with a homogeneous, secondary electron-dominated low temperature γ-mode glow discharges. The heat transfer equation and flow equation for neutral gas are taken into account. We mainly focused on investigations of the nanoparticle properties in atmospheric pressure microdischarges, and discussed the influences of pressure, electrode spacing, and applied voltage on the plasma density and nanoparticle density profiles. The results show that the characteristics of microdischarges are quite different from those of low pressure radio-frequency discharges. First, the nanoparticle density in the bulk plasma in microdischarges is much larger than that of low pressure discharges. Second, the nanoparticle density of 10 nm experiences an exponential increase as soon as the applied voltage increases, especially in the presheath. Finally, as the electrode spacing increases, the nanoparticle density decreased instead of increasing.
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Received: 11 November 2015
Revised: 14 February 2016
Accepted manuscript online:
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PACS:
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52.27.Lw
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(Dusty or complex plasmas; plasma crystals)
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52.65.-y
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(Plasma simulation)
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52.80.Pi
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(High-frequency and RF discharges)
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Fund: Project supported by the Natural Science Foundation of Heilongjiang Province, China (Grant Nos. A2015011 and A2015010), the Postdoctoral Scientific Research Development Fund of Heilongjiang Province, China (Grant No. LBH-Q14159), the Program for Young Teachers Scientific Research in Qiqihar University (Grant No. 2014k-Z11), the National Natural Science Foundation of China (Grant No. 11404180), and the University Nursing Program for Yong Scholars with Creative Talents in Heilongjiang Province, China (Grant No. UNPYSCT-2015095). |
Corresponding Authors:
Xiang-Mei Liu
E-mail: lxmjsc98@163.com
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Cite this article:
Xiang-Mei Liu(刘相梅), Qi-Nan Li(李奇楠), Rui Li(李瑞) Simulation of nanoparticle coagulation in radio-frequency C2H2/Ar microdischarges 2016 Chin. Phys. B 25 065203
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