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学者姓名：史宗谦
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Abstract ：
Numerical investigation was carried out on the evolution of inhomogeneous energy deposition of polarity effects in negative polarity electrical explosion of aluminum wire in vacuum. First, radial electric field distribution of the aluminum wire was simulated. The results showed that the initial electric field near electrodes was much smaller than that in the middle of the wire. A model of electrical wire explosion based on ZEUS-EW with artificial limitation on breakdown time of the aluminum wire was used to simulate the behavior of inhomogeneous energy deposition of the polarity effect. The complete evolution process of electrical explosion of the aluminum wire with inhomogeneous energy deposition was further explored and qualitatively divided into three stages according to the simulation results. Finally, the influence of some factors on the inhomogeneous energy deposition simulation was investigated. This study provides some help for a better understanding of the polarity effect in the process of wire explosion. Published under an exclusive license by AIP Publishing.
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| GB/T 7714 | Shi, Zongqian , Fu, Guiling , Wang, Kun et al. Numerical investigation of negative polarity electrical explosion of aluminum wire in vacuum [J]. | PHYSICS OF PLASMAS , 2022 , 29 (11) . |
| MLA | Shi, Zongqian et al. "Numerical investigation of negative polarity electrical explosion of aluminum wire in vacuum" . | PHYSICS OF PLASMAS 29 . 11 (2022) . |
| APA | Shi, Zongqian , Fu, Guiling , Wang, Kun , Cao, Ziyang . Numerical investigation of negative polarity electrical explosion of aluminum wire in vacuum . | PHYSICS OF PLASMAS , 2022 , 29 (11) . |
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Abstract ：
The phenomenon of cathode spot (CS) retrograde motion has been attracting extensive research in the field of vacuum arc. Although a number of theoretical models have been proposed to explain this phenomenon, up to now, the first-principle understanding is still missing. In this work, based on the generalized Ohm's law, it is proposed that there is a transport current in the explosive emission center when a transverse magnetic field (TMF) is applied. The investigation of the influence of the transport current on the strength of the electric field in the cathode sheath suggests that the transport current affects the ignition of new CS in the retrograde direction. In the framework of the ecton model, combined with the dynamics of explosive emission plasma, the relationship between the strength of applied TMF and the ignition probability of new CS in different directions is established, and the retrograde motion characteristics of CS are simulated using a statistical model. The simulation results show that the directionality of retrograde motion of CS is enhanced with an increase in TMF, and the retrograde motion speed of CS increases with the increase of the applied TMF. When the strength of TMF is small, the motion speed of a single CS has a linear relationship with the strength of TMF, but with the increase of the strength of TMF, the motion speed of a single CS is gradually saturated, which is consistent with experimental facts. The feasibility of the model is verified by comparing the simulation results with relevant experimental results.
Keyword ：
Cathodes Cathode spot (CS) Ions Perpendicular magnetic anisotropy Plasmas retrograde motion Saturation magnetization Simulation transverse magnetic field (TMF) Vacuum arcs
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| GB/T 7714 | Xu, Pengfei , Shi, Zongqian , Guo, Jing et al. Theoretical Model of the Retrograde Motion of Cathode Spots of Vacuum Arc [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2022 , 50 (10) : 3742-3750 . |
| MLA | Xu, Pengfei et al. "Theoretical Model of the Retrograde Motion of Cathode Spots of Vacuum Arc" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 50 . 10 (2022) : 3742-3750 . |
| APA | Xu, Pengfei , Shi, Zongqian , Guo, Jing , Zhu, Qijie , Mo, Yongpeng , Sun, Jiajia et al. Theoretical Model of the Retrograde Motion of Cathode Spots of Vacuum Arc . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2022 , 50 (10) , 3742-3750 . |
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Abstract ：
The flexible high-voltage direct current (HVDC) power system develops quickly with the large-scale utilization of new energy and the increase of direct current (dc) loads in recent years. HVDC circuit breakers are very important components in the flexible HVDC power system. The mechanical HVDC circuit breaker including vacuum interrupters is a potential solution for HVDC interruption. After the current interruption, a transient interrupting voltage (TIV) generated from the interaction with the external circuit will be applied to the mechanical HVDC circuit breakers and might cause a failure interruption. However, there are still few studies about the influences of TIV on the postarc dielectric recovery process of mechanical HVDC circuit breakers. In this article, a circuit model based on the simplification of a 10-kV mechanical HVDC circuit breaker is developed for the purpose of studying the characteristics of TIV. Then the effects of the parallel snubber circuit on the TIV are discussed. Moreover, the influence of TIV on the postarc residual plasma dissipation process is simulated by a particle-in-cell (PIC) model. The results show that the TIV with a parallel snubber circuit has little effect on the whole dissipation time compared with that without a parallel snubber circuit. It should be noted that the microdissipation processes of the above two situations are different.
Keyword ：
Circuit breakers DC circuit breaker Dielectrics HVDC transmission Integrated circuit modeling Oscillators particle-in-cell (PIC) simulation postarc dielectric recovery process Resistance snubber circuit Snubbers transient interrupting voltage (TIV)
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| GB/T 7714 | Mo, Yongpeng , Li, Yixuan , Shi, Zongqian et al. Research on the Transient Interrupting Voltage of Mechanical HVDC Circuit Breaker and Its Influences on the Postarc Dielectric Recovery Process [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2022 , 50 (12) : 4944-4950 . |
| MLA | Mo, Yongpeng et al. "Research on the Transient Interrupting Voltage of Mechanical HVDC Circuit Breaker and Its Influences on the Postarc Dielectric Recovery Process" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 50 . 12 (2022) : 4944-4950 . |
| APA | Mo, Yongpeng , Li, Yixuan , Shi, Zongqian , Bao, Leilei , Jia, Shenli . Research on the Transient Interrupting Voltage of Mechanical HVDC Circuit Breaker and Its Influences on the Postarc Dielectric Recovery Process . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2022 , 50 (12) , 4944-4950 . |
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Abstract ：
With the development in biomedical and biotechnological areas, novel and efficient microfluidic devices integrated with sufficient and rapid mixing function have been attracting enormous scientific attention as versatile and robust platform for low cost and non-contact biological analysis and diagnose. Here, we design and fabricate a magnetic micromixer integrated with special designed microwires, a Y-shaped microchannel and uniform magnetic field for realizing rapid mixing between ferrofluid and deionized water. A comprehensive analysis on the dynamic behavior of ferrofluid is performed by using 3D Eulerian-Eulerian model. Good consistency between experiment and numerical results demonstrates that the enhanced mixing in the presence of longitudinally arranged microwires is due to the introduction of eddies, whose impacts are strengthened with the increase of the number of microwires (n(w)). However, increasing n(w) requires a long microchannel and long time to complete mixing. In order to further improve the mixing performance of our micromixer, a horizontally arranged microwire combined with a particular uniform magnetic field is proposed to provide enough magnetic force for enhancing the mixing of ferrofluid and deionized water, receiving optimal mixing efficiency 99.06%. The flexible tunability of external uniform magnetic field enables desired performance of our designed system.
Keyword ：
Active micromixer Ferrofluid Magnetic field Microfluid Microwire
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| GB/T 7714 | Sun, Jiajia , Shi, Zongqian , Li, Mingjia et al. Numerical and experimental investigation of a magnetic micromixer under microwires and uniform magnetic field [J]. | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2022 , 551 . |
| MLA | Sun, Jiajia et al. "Numerical and experimental investigation of a magnetic micromixer under microwires and uniform magnetic field" . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 551 (2022) . |
| APA | Sun, Jiajia , Shi, Zongqian , Li, Mingjia , Sha, Jingjie , Zhong, Mingjie , Chen, Shuang et al. Numerical and experimental investigation of a magnetic micromixer under microwires and uniform magnetic field . | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS , 2022 , 551 . |
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Abstract ：
In order to get an insight into residual plasma radial motion during the post-arc stage, a two-dimensional (2D) cylindrical particle-in-cell (PIC) model is developed. Firstly, influences of a virtual boundary condition on the residual plasma motion are studied. For purpose of validating this 2D cylindrical particle-in-cell model, a comparison between one-dimensional particle-in-cell model is also presented in this paper. Then a study about the influences of the rising rate of transient recovery voltage on the residual plasma radial motion is presented on the basis of the 2D PIC model.
Keyword ：
particle-in-cell simulation residual plasma dissipation vacuum circuit breakers
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| GB/T 7714 | Mo, Yongpeng , Shi, Zongqian , Jia, Shenli . Study of post-arc residual plasma dissipation process of vacuum circuit breakers based on a 2D particle-in-cell model [J]. | PLASMA SCIENCE & TECHNOLOGY , 2022 , 24 (4) . |
| MLA | Mo, Yongpeng et al. "Study of post-arc residual plasma dissipation process of vacuum circuit breakers based on a 2D particle-in-cell model" . | PLASMA SCIENCE & TECHNOLOGY 24 . 4 (2022) . |
| APA | Mo, Yongpeng , Shi, Zongqian , Jia, Shenli . Study of post-arc residual plasma dissipation process of vacuum circuit breakers based on a 2D particle-in-cell model . | PLASMA SCIENCE & TECHNOLOGY , 2022 , 24 (4) . |
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Abstract ：
An efficient fluid mixing performance is achieved by a Tesla/hexagon-shaped passive micromixer in a wide range of Reynolds numbers with short mixing length (4.2 mm/1.15 mm from the origin). The passive micromixers are composed of Tesla/hexagonal chambers and Omega-shaped obstacles or combined with straight-shaped obstacles that induce the generation of vortex, contraction and expansion process, the changes of the flow direction, and even the split and recombination of streams. The mixing process of two fluids (water and ferrofluid) is numerically investigated using computational fluid dynamics. For the Tesla-shaped micromixer embedded with Omega-shaped obstacles, a sufficient mixing is obtained as the obstacles are in contact with the internal walls of Tesla chambers. In the hexagon-shaped micromixer, the combination of straight-and omega-shaped obstacles greatly enhance the performance of micromixer in particular at moderate flow rate (110). Moreover, reasonable increasing the curvature radius of the omega-shaped obstacles can further improve its mixing performance. The designed passive micromixers were also fabricated, tested and compared with the numerical results through the soft -lithography processes, and the good agreement between the experimental and numerical results identifies our predictions. The good performance of the designed micromixers provides a new direction in designing micro -mixer with high-throughput and short mixing length.
Keyword ：
Ferrofluid Micromixer Omega -shaped obstacles Passive mixing Straight -shaped obstacles
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| GB/T 7714 | Sun, Jiajia , Shi, Zongqian , Zhong, Mingjie et al. Numerical and experimental investigation on a planar passive micromixer embedded with omega-shaped obstacles for rapid fluid mixing [J]. | CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION , 2022 , 182 . |
| MLA | Sun, Jiajia et al. "Numerical and experimental investigation on a planar passive micromixer embedded with omega-shaped obstacles for rapid fluid mixing" . | CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION 182 (2022) . |
| APA | Sun, Jiajia , Shi, Zongqian , Zhong, Mingjie , Ma, Yuxin , Chen, Shuang , Liu, Xiaofeng et al. Numerical and experimental investigation on a planar passive micromixer embedded with omega-shaped obstacles for rapid fluid mixing . | CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION , 2022 , 182 . |
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Abstract ：
In this paper, the evolution of vacuum arc under different conditions in the quench protection switch (QPS) based on forced current zero was investigated experimentally and analyzed quantitatively. Experiments were conducted with cup-shaped axial magnetic field (AMF) contacts in a demountable vacuum chamber. Images of the arc column were photographed through the observation window with a high-speed digital camera with exposure time of 2 mu s. Arc appearance was analyzed quantitatively through digital image processing. Quantified arc appearance and arc voltage characteristics indicated that the high-current vacuum arc evolution in the QPS could be divided into four stages: arc formation stage, arc column merging stage, diffusing stage, and fast extinguishing stage. The influence of AMF on the evolution of high-current vacuum arc in the diffusing stage was also studied. Experiment results indicated that the vacuum arc at relatively low current had a simpler evolution process and the arc column merging had less correlation with voltage stability. It was found that the vacuum arc with a long gap distance developed faster and the time required to enter the stable burning state was shorter. In addition, the vacuum arc with long arcing time tended to constrict again, which is not beneficial to current interruption. Published under an exclusive license by AIP Publishing.
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| GB/T 7714 | Shi, Zongqian , Lv, Xinkun , Guo, Jing et al. Experimental investigation on the evolution of vacuum arc in the quench protection switch based on forced current zero [J]. | PHYSICS OF PLASMAS , 2022 , 29 (9) . |
| MLA | Shi, Zongqian et al. "Experimental investigation on the evolution of vacuum arc in the quench protection switch based on forced current zero" . | PHYSICS OF PLASMAS 29 . 9 (2022) . |
| APA | Shi, Zongqian , Lv, Xinkun , Guo, Jing , Li, Sheng , Mo, Yongpeng , Sun, Jiajia . Experimental investigation on the evolution of vacuum arc in the quench protection switch based on forced current zero . | PHYSICS OF PLASMAS , 2022 , 29 (9) . |
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Abstract ：
Patterning a wide range of colloidal plasmonic nanoparticles into prescribed spatial arrangements, analogous to the formation of natural materials, enables the fabrication of functionalized structures with novel optical properties, such as Fano resonance, magneto-optical Kerr effect, negative refraction, etc. Currently, capillarity-assisted particle assembly is always utilized to place colloidal particles at predetermined positions by exploiting the capillary forces resulting from the motion of an evaporating droplet. However, this technique requires specialized equipment and the assembly process is always carried out in an open system, thereby introducing the risk of contamination and limiting its applications. Here, we present a microfluidic and magnetic field-assisted self-assembly of colloidal magnetic-plasmonic nanoparticles by utilizing magnetic dipole-dipole interactions resulting from the localized magnetic gradient field produced by an array of soft-magnetic elements and external magnetic bias field. The magnetized magnetic-plasmonic nanoparticles are controlled to deposit at the predesigned traps microfabricated onto the soft-magnetic elements. After deposition, the inlet velocity of the microchannel is improved to clear away the particles out of the traps, forming arrays of patterns with consistent structures. Furthermore, a Lagrangian-Eulerian model is introduced for the first time to predict the processing of the microfluidic and magnetic field-assisted self-assembly of colloidal magnetic-plasmonic nanoparticles by taking the magnetic and hydrodynamic forces and particle-fluid interaction into account. Our analysis demonstrates that the particle-fluid interaction not only plays a significant role in determining the final self-assembled nanostructures, but provides an opportunity to improve the consistency of the assembled nanostructures. The microfluidic and magnetic field-assisted self-assembly protocol proposed here enables the patterning of colloidal magnetic-plasmonic nanoparticles to be carried out in a controlled environment and also opens up a new direction for assembling complex structures.
Keyword ：
magnetic field magnetic-plasmonic nanoparticle microfluidic self-assembly
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| GB/T 7714 | Sun, Jiajia , Shi, Zongqian , Li, Mingjia et al. Theoretical investigation of the microfluidic and magnetic field-assisted self-assembly of colloidal magnetic-plasmonic nanoparticles [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2021 , 54 (32) . |
| MLA | Sun, Jiajia et al. "Theoretical investigation of the microfluidic and magnetic field-assisted self-assembly of colloidal magnetic-plasmonic nanoparticles" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 54 . 32 (2021) . |
| APA | Sun, Jiajia , Shi, Zongqian , Li, Mingjia , Chen, Shuang , Zhong, Mingjie , Liu, Xiaofeng et al. Theoretical investigation of the microfluidic and magnetic field-assisted self-assembly of colloidal magnetic-plasmonic nanoparticles . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2021 , 54 (32) . |
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Abstract ：
The splitting and threshold currents of vacuum arc cathode spots in axial magnetic fields (AMFs) up to 220 mT are investigated experimentally. Measurements are made on electrodes of Cu and CuCr25 with electrode separations of 2 and 6 mm. The electrode diameter is 30 mm. All the experiments are conducted in a demountable vacuum chamber evacuated continuously by a turbo-molecular pump to a pressure of the order of 10(-3) Pa. The spots are photographed using a high-speed digital camera with an exposure time of 2 mu s. The AMF is applied by means of two permanent magnets placed symmetrically inside the chamber. The experimental results indicate that the splitting and threshold current decrease in the presence of AMF and tend to certain constant values when the field gets stronger. The splitting and threshold currents are considerably larger than Cu electrodes than those with CuCr25 electrodes. With increasing electrode separation, the splitting current decreases while the threshold current increases. Possible explanations are proposed to account for the experimental observations.
Keyword ：
Axial magnetic field (AMF) cathode spot splitting current threshold current vacuum arc
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| GB/T 7714 | Shi, Zongqian , Xu, Pengfei , Zhu, Qijie et al. Experimental Investigation on the Current Carried by a Cathode Spot of Vacuum Arc in Axial Magnetic Fields [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2021 , 49 (5) : 1648-1653 . |
| MLA | Shi, Zongqian et al. "Experimental Investigation on the Current Carried by a Cathode Spot of Vacuum Arc in Axial Magnetic Fields" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 49 . 5 (2021) : 1648-1653 . |
| APA | Shi, Zongqian , Xu, Pengfei , Zhu, Qijie , Wu, Bingzhou , Wang, Cong , Jia, Shenli . Experimental Investigation on the Current Carried by a Cathode Spot of Vacuum Arc in Axial Magnetic Fields . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2021 , 49 (5) , 1648-1653 . |
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Abstract ：
The dielectric recovery process has decisive effects on the current interruption process in vacuum circuit breakers, which has attracted the special attention of researchers. In commercial vacuum interrupters, ions and electrons of the residual plasma between the contact gap are separated and then fly to the electrodes under the effect of the transient recovery voltage after current zero. During this period, the post-arc current forms. During the formation of the post-arc current, ions also enter the post-arc anode due to their thermal motion. Therefore, the number of net electrons, which form the post-arc current, is only part of the total electrons between the contact gap at current zero. During the post-arc sheath expansion process, almost all electrons in the contact gap will enter the post-arc anode under the effects of the transient recovery voltage. If the proportion of ions and electrons, which enter the post-arc anode, can be obtained, the total number of electrons and consequently the residual plasma density between the contact gap could be estimated from the integration of the post-arc current. In this paper, the influences on the absorption of charged particles by the post-arc anode of some factors, e.g., rising rate of transient recovery voltage and metal vapor, have been simulated and discussed with a one-dimensional particle in cell-Monte Carlo collision model. © 2021 Author(s).
Keyword ：
Anodes Electric circuit breakers Electrons Expansion Ions Metal recovery Molecular biology Plasma density Power quality Timing circuits Transients Vacuum technology
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| GB/T 7714 | Mo, Yongpeng , Shi, Zongqian , Jia, Shenli . Study of the influences of different factors on the charged particles absorbed by the post-arc anode during the post-arc sheath expansion process in vacuum circuit breakers [J]. | AIP Advances , 2021 , 11 (1) . |
| MLA | Mo, Yongpeng et al. "Study of the influences of different factors on the charged particles absorbed by the post-arc anode during the post-arc sheath expansion process in vacuum circuit breakers" . | AIP Advances 11 . 1 (2021) . |
| APA | Mo, Yongpeng , Shi, Zongqian , Jia, Shenli . Study of the influences of different factors on the charged particles absorbed by the post-arc anode during the post-arc sheath expansion process in vacuum circuit breakers . | AIP Advances , 2021 , 11 (1) . |
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