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This works aims at the study of a Faraday electric accelerator with the plasma of argon used as the working gas, which is pre-ionized by nuclear energy. The electron density of plasma is above 1020/m3. Different configurations of magnetic field are numerical studied to obtain the influences on the plasma ionization and flowing characteristics. A relatively higher velocity and electron number density are obtained in monotonically decreasing magnetic field generated by magnet with a shorter length. When the plasma flows through the magnetic field generated by 75-mm magnets, the outflow velocity is 2040 m/s, which is higher than 2016 m/s when the plasma flows through the magnetic field generated by 100-mm magnets.
Lai Li; Xi Lu; Guiping Zhu; Hulin Huang; Xidong Zhang. Effect of magnetic field configuration on Faraday MHD accelerator. IOP Conference Series: Earth and Environmental Science 2020, 431, 1 .
AMA StyleLai Li, Xi Lu, Guiping Zhu, Hulin Huang, Xidong Zhang. Effect of magnetic field configuration on Faraday MHD accelerator. IOP Conference Series: Earth and Environmental Science. 2020; 431 (1):1.
Chicago/Turabian StyleLai Li; Xi Lu; Guiping Zhu; Hulin Huang; Xidong Zhang. 2020. "Effect of magnetic field configuration on Faraday MHD accelerator." IOP Conference Series: Earth and Environmental Science 431, no. 1: 1.
This paper discusses a detailed computational analysis that illustrated the influences of the magnetic field and external potential on the performance of a high-temperature Hall-effect electric thruster. Uniform and non-uniform magnetic field configurations were examined. The Lorentz force in the $x$ direction, acting on the plasma, was shown to substantially enhance the flow velocity in the non-uniform magnetic field, which indicated that the non-uniform magnetic field was more suitable for Hall-effect electromagnetic acceleration. The static temperature increased with the external potential, especially near the region of cathode. This increment in gas temperature, together with the effect of the Lorentz force, results in the enhancement of the velocity at the front and back of the cathode. However, the Mach number and gas density decreased due to static temperature increases caused by the conversion of more electric power into internal energy. The thrust increased eventually with the increase of the average exit velocity.
Lai Li; Xi Lu; Wei Wang; Guiping Zhu; Hulin Huang; Xidong Zhang. Performance investigation of a high-temperature and power Hall-effect electric propulsion. Journal of Plasma Physics 2019, 85, 1 .
AMA StyleLai Li, Xi Lu, Wei Wang, Guiping Zhu, Hulin Huang, Xidong Zhang. Performance investigation of a high-temperature and power Hall-effect electric propulsion. Journal of Plasma Physics. 2019; 85 (6):1.
Chicago/Turabian StyleLai Li; Xi Lu; Wei Wang; Guiping Zhu; Hulin Huang; Xidong Zhang. 2019. "Performance investigation of a high-temperature and power Hall-effect electric propulsion." Journal of Plasma Physics 85, no. 6: 1.
Micro‐structure patterned substrates attract our attention due to the special and programmable wettabilities. The interaction between the liquid and micro/nano structures gives rise to controllable spreading and thus evaporation. For exploration of the application versatility, the introduction of nanoparticles in liquid droplet results in interaction among particles, liquid and microstructures. In addition, temperature of the substrates strongly affects the spreading of the contact line and the evaporative property. The evaporation of sessile droplets of nanofluids on a micro‐grooved solid surface are investigated in terms of liquid and surface properties. The patterned nickel surface used in the experiments is designed and fabricated with circular and rectangular shaped pillars whose size ratios between interval and pillars is fixed at 5. The behavior is firstly compared between nanofluid and pure liquid on substrates at room temperature. For pure water droplet, the drying time is relatively longer due to the receding of contact line which slows down the liquid evaporation. Higher concentrations of nanoparticles tend to increase the total evaporation time. With varying concentrations of graphite at nano scale from 0.02% to 0.18% with an interval at 0.04% in water droplets and the heating temperature from 22 to 85°C, the wetting and evaporation of the sessile droplets are systematically studied with discussion on the impact parameters and the resulted liquid dynamics as well as the stain. The interaction among the phases together with the heating strongly affects the internal circulation inside the droplet, the evaporative rate and the pattern of particles deposition. This article is protected by copyright. All rights reserved
Gui-Ping Zhu; Kian-Soo Ong; Karen Siew-Ling Chong; Jia-Feng Yao; Hu-Lin Huang; Fei Duan. Evaporative characteristics of sessile nanofluid droplet on micro-structured heated surface. ELECTROPHORESIS 2018, 40, 845 -850.
AMA StyleGui-Ping Zhu, Kian-Soo Ong, Karen Siew-Ling Chong, Jia-Feng Yao, Hu-Lin Huang, Fei Duan. Evaporative characteristics of sessile nanofluid droplet on micro-structured heated surface. ELECTROPHORESIS. 2018; 40 (6):845-850.
Chicago/Turabian StyleGui-Ping Zhu; Kian-Soo Ong; Karen Siew-Ling Chong; Jia-Feng Yao; Hu-Lin Huang; Fei Duan. 2018. "Evaporative characteristics of sessile nanofluid droplet on micro-structured heated surface." ELECTROPHORESIS 40, no. 6: 845-850.
This work studied and presented a high-power Hall-effect electric propulsion thruster. The working Xenon gas is heated and ionized by nuclear energy to generate plasma which is injected into the channel. The plasma in the channel is described by two-temperature model consists of ions, electrons and atoms with the electron density of plasma above 1020 m−3. The Lorentz force acting on the plasma makes the flow velocity increase obviously. The operating power of the thruster is about 20 kW. The mass flow rate of xenon is set at 1.56 g/s.
Lai Li; Xi Lu; Hulin Huang; Xidong Zhang; Guiping Zhu. The Numerical Simulation of a High Power Hall Effect Thruster. IOP Conference Series: Earth and Environmental Science 2018, 192, 012008 .
AMA StyleLai Li, Xi Lu, Hulin Huang, Xidong Zhang, Guiping Zhu. The Numerical Simulation of a High Power Hall Effect Thruster. IOP Conference Series: Earth and Environmental Science. 2018; 192 (1):012008.
Chicago/Turabian StyleLai Li; Xi Lu; Hulin Huang; Xidong Zhang; Guiping Zhu. 2018. "The Numerical Simulation of a High Power Hall Effect Thruster." IOP Conference Series: Earth and Environmental Science 192, no. 1: 012008.
Microfluidic device embedding electrodes realizes cell manipulation with the help of dielectrophoresis. Cell manipulation is an important technology for cell sorting and cell population purification. Till now, the theory of dielectrophoresis has been greatly developed. Microfluidic devices with various arrangements of electrodes have been reported, from the beginning of the single non‐uniform electric field to the later multiple physical fields. This paper reviews the research status of microfluidic device embedding electrodes for cell manipulation based on dielectrophoresis. Firstly, the working principle of dielectrophoresis is explained. Next, cell manipulation approaches based on dielectrophoresis are introduced. Then, different types of electrode arrangements in the microfluidic device for cell manipulation are discussed, including planar, multilayered and microarray dot electrodes. Finally, the future development trend of the dielectrophoresis with the help of microfluidic devices is prospected. With the rapid development of microfluidic technology, in the near future, high precision, high throughput, high efficiency, multifunctional, portable, economical and practical microfluidic dielectrophoresis will be widely used in the fields of biology, medicine, agriculture and so on. This article is protected by copyright. All rights reserved
Jiafeng Yao; Guiping Zhu; Tong Zhao; Masahiro Takei. Microfluidic device embedding electrodes for dielectrophoretic manipulation of cells‐A review. ELECTROPHORESIS 2018, 40, 1166 -1177.
AMA StyleJiafeng Yao, Guiping Zhu, Tong Zhao, Masahiro Takei. Microfluidic device embedding electrodes for dielectrophoretic manipulation of cells‐A review. ELECTROPHORESIS. 2018; 40 (8):1166-1177.
Chicago/Turabian StyleJiafeng Yao; Guiping Zhu; Tong Zhao; Masahiro Takei. 2018. "Microfluidic device embedding electrodes for dielectrophoretic manipulation of cells‐A review." ELECTROPHORESIS 40, no. 8: 1166-1177.
A significant growth of research on adaptive liquid lens is achieved over the past decades, and the field is still attracting increasing attentions focusing on the transition from the current stage to the commercialized stage. The challenges facing are but not limited to fabrication, material, small tuning range in focal lengths, additional control systems, limitations in special actuation methods and so on. In addition, the use of external driving parts or systems induce extra problem on bulky appearance, high cost, low reliability etc.. Therefore, adaptive liquid lens will be an interesting research focus in both microfluidics and optofluidics science. This review attempts to summarize and focus on the droplet profile deformation under different driving mechanisms in tunable liquid microlens as well as the application in cameras, cell phone and so on. The driving techniques are generally categorized in terms of mechanisms and driving sources. This article is protected by copyright. All rights reserved
Gui‐Ping Zhu; Jia‐Feng Yao; Shi‐Hua Wu; Xi‐Dong Zhang. Actuation of adaptive liquid microlens droplet in microfluidic devices: A review. ELECTROPHORESIS 2018, 40, 1148 -1159.
AMA StyleGui‐Ping Zhu, Jia‐Feng Yao, Shi‐Hua Wu, Xi‐Dong Zhang. Actuation of adaptive liquid microlens droplet in microfluidic devices: A review. ELECTROPHORESIS. 2018; 40 (8):1148-1159.
Chicago/Turabian StyleGui‐Ping Zhu; Jia‐Feng Yao; Shi‐Hua Wu; Xi‐Dong Zhang. 2018. "Actuation of adaptive liquid microlens droplet in microfluidic devices: A review." ELECTROPHORESIS 40, no. 8: 1148-1159.
In this paper, numerical simulations are carried out to predict the performance of a new designed configuration of the disk magnetohydrodynamic (MHD) generator, which segments the generator into dozens of parts. The behaviors and characteristics of segments are mainly investigated with number of parts at 24, 36, 60, 72, 90 adopted Large Eddy Simulation (LES). The numerical results declared that these division generators approach more stable plasma ionization and better performance than that of the conventional disk MHD generator at the same working conditions. The optimal value can be reached when the angle is 5–10 degrees (36–72 parts). Due to the division of the generator, the internal resistance is larger than that of the conventional disk channel that causes the reduction of Faraday current, hence the Lorentz force, jθB, decreased. Therefore, the radial velocity increased and static pressure decreased. Consequently, the reduction of static pressure contributes to improvement to the plasma uniformity and ionization stability. Those features reveal that the designed configuration has the obvious advantage on raising energy conversion efficiency and power output.
Lai Li; Hu-Lin Huang; Gui-Ping Zhu. Numerical Simulations for a Partial Disk MHD Generator Performance. Energies 2018, 11, 127 .
AMA StyleLai Li, Hu-Lin Huang, Gui-Ping Zhu. Numerical Simulations for a Partial Disk MHD Generator Performance. Energies. 2018; 11 (1):127.
Chicago/Turabian StyleLai Li; Hu-Lin Huang; Gui-Ping Zhu. 2018. "Numerical Simulations for a Partial Disk MHD Generator Performance." Energies 11, no. 1: 127.
An incompressible electrically conducting viscous fluid flow influenced by a local external magnetic field may develop vortical structures and eventually instabilities similar to those observed in flows around bluff bodies (such as circular cylinder), denominated magnetic obstacle. The present investigation analyzes numerically the three-dimensional flow and heat transfer around row of magnetic obstacles. The vortex structures of magnetic obstacles, heat transfer behaviors in the wake of magnetic obstacles, and flow resistance are analyzed at different Reynolds numbers. It shows that the flow behind magnetic obstacles contains four different regimes: (1) one pair of magnetic vortices, (2) three pairs namely, magnetic, connecting, and attached vortices, (3) smaller vortex shedding from the in-between magnetic obstacles, i.e., quasi-static, and (4) regular vortex shedding from the row of magnetic obstacles. Furthermore, downstream cross-stream mixing induced by the unstable wakes can enhance wall-heat transfer, and the maximum value of percentage heat transfer increment (HI) is equal to about 35%. In this case, the thermal performance factor is more than one.
Xidong Zhang; Guiping Zhu; Yin Zhang; Hongyan Wang; Hulin Huang. Influence of Reynolds Numbers on the Flow and Heat Transfer Around Row of Magnetic Obstacles. Journal of Heat Transfer 2017, 139, 051701 .
AMA StyleXidong Zhang, Guiping Zhu, Yin Zhang, Hongyan Wang, Hulin Huang. Influence of Reynolds Numbers on the Flow and Heat Transfer Around Row of Magnetic Obstacles. Journal of Heat Transfer. 2017; 139 (5):051701.
Chicago/Turabian StyleXidong Zhang; Guiping Zhu; Yin Zhang; Hongyan Wang; Hulin Huang. 2017. "Influence of Reynolds Numbers on the Flow and Heat Transfer Around Row of Magnetic Obstacles." Journal of Heat Transfer 139, no. 5: 051701.
Floating zone technique is a crucible-free process for growth of high quality single crystals. Unstable thermocapillary convection is a typical phenomenon during the process under microgravity. Therefore, it is very important to investigate the instability of thermocapillary convection in liquid bridges with deformable free-surface under microgravity. In this works, the Volume of Fluid (VOF) method is employed to track the free-surface movement. The results are presented as the behavior of flow structure and temperature distribution of the molten zone. The impact of Marangoni number (Ma) is also investigated on free-surface deformation as well as the instability of thermocapillary convection. The free-surface exhibits a noticeable axisymmetric (but it is non-centrosymmetric) and elliptical shape along the circumferential direction. This specific surface shape presents a typical narrow ‘neck-shaped’ structure with convex at two ends of the zone and concave at the mid-plane along the axial direction. At both θ = 0° and θ = 90°, the deformation ratio ξ increases rapidly with Ma at first, and then increases slowly. Moreover, the hydrothermal wave number m and the instability of thermocapillary convection increase with Ma.
Yin Zhang; Hu-Lin Huang; Xiao-Ming Zhou; Gui-Ping Zhu; Yong Zou. Effect of Marangoni number on thermocapillary convection and free-surface deformation in liquid bridges. Journal of Thermal Science 2016, 25, 178 -187.
AMA StyleYin Zhang, Hu-Lin Huang, Xiao-Ming Zhou, Gui-Ping Zhu, Yong Zou. Effect of Marangoni number on thermocapillary convection and free-surface deformation in liquid bridges. Journal of Thermal Science. 2016; 25 (2):178-187.
Chicago/Turabian StyleYin Zhang; Hu-Lin Huang; Xiao-Ming Zhou; Gui-Ping Zhu; Yong Zou. 2016. "Effect of Marangoni number on thermocapillary convection and free-surface deformation in liquid bridges." Journal of Thermal Science 25, no. 2: 178-187.
The wetting, spreading and drying of pure liquid and nanofluid sessile droplets on a patterned solid surface were investigated systematically in terms of liquid and surface property. The patterned nickel surface was characterized with diamond, circular, hexagon and rectangular pillars. The size ratio between interval and pillars varies from 1.0 to 5.0. The study was firstly carried out for the effect of pure water droplet size on liquid spreading and droplet evaporation process on diamond-shape micro structured substrate with LInterval/LPillar=1.0. Larger amount of liquid leads to a larger wetting area. With fixed substrate (diamond, LInterval/LPillar=1.0) and droplet size (1 μm), mixture of DI water and Ethanol (volume ratio varies from 0.5 to 2.0) was used for generating droplets with different surface tension and evaporation coefficient. Fingering shape would generate on the contact line. With higher concentration of ethanol, the fingering effect is stronger and appeared in a shorter time. The contact area shrinks when increase the size ratio of interval and pillar. This would reduce the length of the contact line, and thus slow down the liquid evaporation. The role of pillar shape was examined based on time for complete evaporation. The effect of surface material on evaporation process was conducted on nickel and PMMA substrate fabricated with the same design. Additionally, investigations were conducted with solutions consisted with nanoparticles and DI water. The mixture were made at different weight ration to achieve concentration of nanoparticles varies from 0.02% to 0.18% with an interval at 0.04%.
Gui-Ping Zhu; Kian-Soo Ong; Karen Siew-Ling Chong; Hu-Lin Huang; Fei Duan. Investigation of Sessile Droplet Wetting, Dynamics and Evaporation on Micro-Structured Substrates. Volume 2: Micro/Nano-Thermal Manufacturing and Materials Processing; Boiling, Quenching and Condensation Heat Transfer on Engineered Surfaces; Computational Methods in Micro/Nanoscale Transport; Heat and Mass Transfer in Small Scale; Micro/Miniature Multi-Phase Devices; Biomedical Applications of Micro/Nanoscale Transport; Measurement Techniques and Thermophysical Properties in Micro/Nanoscale; Posters 2016, 1 .
AMA StyleGui-Ping Zhu, Kian-Soo Ong, Karen Siew-Ling Chong, Hu-Lin Huang, Fei Duan. Investigation of Sessile Droplet Wetting, Dynamics and Evaporation on Micro-Structured Substrates. Volume 2: Micro/Nano-Thermal Manufacturing and Materials Processing; Boiling, Quenching and Condensation Heat Transfer on Engineered Surfaces; Computational Methods in Micro/Nanoscale Transport; Heat and Mass Transfer in Small Scale; Micro/Miniature Multi-Phase Devices; Biomedical Applications of Micro/Nanoscale Transport; Measurement Techniques and Thermophysical Properties in Micro/Nanoscale; Posters. 2016; ():1.
Chicago/Turabian StyleGui-Ping Zhu; Kian-Soo Ong; Karen Siew-Ling Chong; Hu-Lin Huang; Fei Duan. 2016. "Investigation of Sessile Droplet Wetting, Dynamics and Evaporation on Micro-Structured Substrates." Volume 2: Micro/Nano-Thermal Manufacturing and Materials Processing; Boiling, Quenching and Condensation Heat Transfer on Engineered Surfaces; Computational Methods in Micro/Nanoscale Transport; Heat and Mass Transfer in Small Scale; Micro/Miniature Multi-Phase Devices; Biomedical Applications of Micro/Nanoscale Transport; Measurement Techniques and Thermophysical Properties in Micro/Nanoscale; Posters , no. : 1.