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学者姓名：王军
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摘要 ：
Thermo-osmosis describes the fluid flow due to thermal gradients. Usually, thermo-osmosis for a liquid is from high to low temperature. However, in certain cases, the direction of the thermo-osmosis can be reversed (from low to high temperature), i.e., negative thermo-osmosis, and the underlying mechanism for the direction reverse of the thermo-osmosis is still unclear. In the present paper, we study the direction reverse of thermo-osmosis for a liquid in nanochannels by using molecular dynamics simulations. The research findings indicate that the direction and strength of thermo-osmosis depend significantly on the interaction strength between the solid and liquid. The analysis of the potential mean force distribution along the flow direction reveals that the change from positive to negative thermo-osmosis is linked to a reversal in the slope of the potential mean force distribution. Therefore, the sign of the slope of potential mean force distribution can be used as a criterion to predict the direction of thermo-osmosis. The findings in the present paper pave the way for the application of the thermo-osmosis phenomenon.
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| GB/T 7714 | Qi, Kai , Li, Zirui , Wang, Jun et al. Direction reverse of the thermo-osmosis for a liquid in a nanochannel [J]. | PHYSICS OF FLUIDS , 2024 , 36 (11) . |
| MLA | Qi, Kai et al. "Direction reverse of the thermo-osmosis for a liquid in a nanochannel" . | PHYSICS OF FLUIDS 36 . 11 (2024) . |
| APA | Qi, Kai , Li, Zirui , Wang, Jun , Xia, Guodong . Direction reverse of the thermo-osmosis for a liquid in a nanochannel . | PHYSICS OF FLUIDS , 2024 , 36 (11) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In the present paper, we studied the forces on a spherical particle of radius R moving in the vicinity of the plane wall in a shear flow of free molecular regime. We consider that the distance ratio between the plane wall and the particle (L) and the particle radius (R) is large (e.g., L/R > 5), and the gas molecular mean free path (lambda) is much higher than the particle size (lambda/R >> 1). An analytical formula for the forces is obtained based on gas kinetic theory and certain simplifying assumptions, and is verified by using Direct Simulation Monte Carlo Method. It is found that the forces acting on the particle can be affected by the momentum accommodation coefficients (sigma) of the wall and particle surfaces, the wall/gas temperature ratios (T-w/T), and the velocity gradient (G) of the gas flow. In the cases of specular reflections (sigma = 0), the near-wall effect can be neglected. With the increase of the momentum accommodation coefficients, the near-wall effect can be enhanced. When near-wall particles move in the direction parallel to the plane wall, there is a lift force which is perpendicular to the wall due to the near-wall effect and the shear flow. For T-w/T < 1, the lift force for the near-wall particles is in the direction against the wall. While for T-w/T > 1, the force is in the direction away from the plane wall. The findings presented in this paper can provide theoretical guidance for the application of near-wall particles in shear flows.
关键词 ：
Gas kinetic theory Gas kinetic theory Shear lift forces Shear lift forces Near -wall particles Near -wall particles Free molecular regime Free molecular regime
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| GB/T 7714 | Zhang, Kexue , Liu, Wangwang , Chang, Xinquan et al. Forces acting on near-wall spherical particles in shear flows of diluted gases [J]. | JOURNAL OF AEROSOL SCIENCE , 2024 , 181 . |
| MLA | Zhang, Kexue et al. "Forces acting on near-wall spherical particles in shear flows of diluted gases" . | JOURNAL OF AEROSOL SCIENCE 181 (2024) . |
| APA | Zhang, Kexue , Liu, Wangwang , Chang, Xinquan , Wang, Jun , Xia, Guodong . Forces acting on near-wall spherical particles in shear flows of diluted gases . | JOURNAL OF AEROSOL SCIENCE , 2024 , 181 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In this work, the negative differential thermal resistance effect has been proposed in a solid-liquid-solid sand-wiched system with a nanostructured cold surface. Non-equilibrium molecular dynamics simulations demon-strate that the heat flux in the present sandwiched system increases with the temperature bias for low temperature bias, while for high temperature bias, the heat flux decreases counter-intuitively with increasing temperature bias. Based on the analysis of the interfacial thermal resistance and the density depletion length at the solid-liquid interface, the negative differential thermal resistance effect at high temperature bias is attributed to the suppressed solid-liquid interfacial thermal conductance with decreasing temperature. In addition, it is found that the negative differential thermal resistance effect can be tuned by the size of the nanostructure.
关键词 ：
Nanostructure Nanostructure Molecular dynamics simulation Molecular dynamics simulation Negative differential thermal resistance Negative differential thermal resistance Solid -liquid interface Solid -liquid interface
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| GB/T 7714 | Li, Haiyang , Wang, Jun , Xia, Guodong . Negative differential thermal resistance effect in a nanoscale sandwiched system with nanostructured surfaces [J]. | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2023 , 142 . |
| MLA | Li, Haiyang et al. "Negative differential thermal resistance effect in a nanoscale sandwiched system with nanostructured surfaces" . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER 142 (2023) . |
| APA | Li, Haiyang , Wang, Jun , Xia, Guodong . Negative differential thermal resistance effect in a nanoscale sandwiched system with nanostructured surfaces . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2023 , 142 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The thermal rectification effect refers to a phenomenon by which heat can be asymmetrically transferred through a system. For bulk materials, the thermal rectification effect can be achieved in a bi-segment thermal rectifier using materials which have thermal conductivities with different tem perature dependency. However, the thermal rectification ratio is usually limited by using existing bulk materials. In the present paper, we propose to introduce zigzag-structure interfaces into the bi-segment thermal rectifier. The finite element method is employed to conduct the numerical calculations and the heat flux through the system is calculated based on the Fourier's law. It is found that the zigzag interface can improve the thermal rectification ratio by more than 36% compared a bi-segment thermal rectifier with a flat interface. The enhancement in the thermal rectification ratio is explained based on the theory of the transformation thermotics. The present paper provides a novel approach and analytical tool to design thermal rectifier with meta-materials and enhance the thermal rectification effect in bulk materials. (c) 2022 Elsevier Ltd. All rights reserved.
关键词 ：
Bulk materials Bulk materials Thermal conductivity Thermal conductivity Zigzag interface Zigzag interface Thermal rectification Thermal rectification
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| GB/T 7714 | Wang, Jun , Shao, Chunrui , Li, Haiyang et al. Enhancement of thermal rectification effect based on zigzag interfaces in bi-segment thermal rectifier using bulk materials [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2022 , 188 . |
| MLA | Wang, Jun et al. "Enhancement of thermal rectification effect based on zigzag interfaces in bi-segment thermal rectifier using bulk materials" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 188 (2022) . |
| APA | Wang, Jun , Shao, Chunrui , Li, Haiyang , Xia, Guodong . Enhancement of thermal rectification effect based on zigzag interfaces in bi-segment thermal rectifier using bulk materials . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2022 , 188 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Purpose This study aims to satisfy the thermal management of gallium nitride (GaN) high-electron mobility transistor (HEMT) devices, microchannel-cooling is designed and optimized in this work. Design/methodology/approach A numerical simulation is performed to analyze the thermal and flow characteristics of microchannels in combination with computational fluid dynamics (CFD) and multi-objective evolutionary algorithm (MOEA) is used to optimize the microchannels parameters. The design variables include width and number of microchannels, and the optimization objectives are to minimize total thermal resistance and pressure drop under constant volumetric flow rate. Findings In optimization process, a decrease in pressure drop contributes to increase of thermal resistance leading to high junction temperature and vice versa. And the Pareto-optimal front, which is a trade-off curve between optimization objectives, is obtained by MOEA method. Finally, K-means clustering algorithm is carried out on Pareto-optimal front, and three representative points are proposed to verify the accuracy of the model. Originality/value Each design variable on the effect of two objectives and distribution of temperature is researched. The relationship between minimum thermal resistance and pressure drop is provided which can give some fundamental direction for microchannels design in GaN HEMT devices cooling.
关键词 ：
Optimization Optimization Microchannel Microchannel Multi-objective evolutionary algorithm Multi-objective evolutionary algorithm CFD CFD
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| GB/T 7714 | Wang, Jiahao , Xia, Guodong , Li, Ran et al. Numerical simulation and microchannels parameters optimization for thermal management of GaN HEMT devices [J]. | INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW , 2021 , 31 (9) : 2841-2861 . |
| MLA | Wang, Jiahao et al. "Numerical simulation and microchannels parameters optimization for thermal management of GaN HEMT devices" . | INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW 31 . 9 (2021) : 2841-2861 . |
| APA | Wang, Jiahao , Xia, Guodong , Li, Ran , Ma, Dandan , Zhou, Wenbin , Wang, Jun . Numerical simulation and microchannels parameters optimization for thermal management of GaN HEMT devices . | INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW , 2021 , 31 (9) , 2841-2861 . |
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摘要 ：
In this work, we investigate the microscopic mechanism of ion rejection phenomena during the freezing of aqueous NaCl solutions through molecular dynamics simulations. It is found that the hydration energy for the ion-water interaction is stronger than that between ions and ice, which is the fundamental reason giving rise to the phenomenon of ion rejection. The probability of ions being rejected by ice is determined by the competition between the energy barrier at the ice-water interface and the thermal effect. The ion rejection rate increases with increasing temperature. Furthermore, it is found that the rejection rate of Na+ is higher than that of Cl- because of the relatively large hydration energy difference between Na+-water and Na+-ice interactions. The role of temperature in the applications of ion rejection in freeze desalination is also discussed.
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| GB/T 7714 | Luo, Shuang , Jin, Yakang , Tao, Ran et al. Molecular understanding of ion rejection in the freezing of aqueous solutions [J]. | PHYSICAL CHEMISTRY CHEMICAL PHYSICS , 2021 , 23 (23) : 13292-13299 . |
| MLA | Luo, Shuang et al. "Molecular understanding of ion rejection in the freezing of aqueous solutions" . | PHYSICAL CHEMISTRY CHEMICAL PHYSICS 23 . 23 (2021) : 13292-13299 . |
| APA | Luo, Shuang , Jin, Yakang , Tao, Ran , Li, Haiyang , Li, Chu , Wang, Jun et al. Molecular understanding of ion rejection in the freezing of aqueous solutions . | PHYSICAL CHEMISTRY CHEMICAL PHYSICS , 2021 , 23 (23) , 13292-13299 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The nanoparticles suspended in a shear flow are subjected to a shear lift force, which is of great importance for the nanoparticle transport. In previous theoretical analysis on the shear lift, it is usually assumed that the particle temperature is equal to the temperature of the surrounding gas media. However, in some particular applications, the particle temperature can significantly differ from the gas temperature. In the present study, the effect of particle temperature on the shear lift of nanoparticles is investigated and the corresponding formulas of shear lift force are derived based on the gas kinetic theory. For extremely small nanoparticles (with radius R < 2 nm) or large nanoparticles (R > 20 nm), the influence of the particle temperature can be neglected. For the intermediate particle size, the relative error induced by the equal gas-particle temperature can be significant. Our findings can bring an insight into accurate evaluation of the nanoparticle transport properties.
关键词 ：
nanoparticle nanoparticle shear lift force shear lift force gas kinetic theory gas kinetic theory temperature effect temperature effect
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| GB/T 7714 | Su, Jun-Jie , Wang, Jun , Xia, Guo-Dong . Effect of the particle temperature on lift force of nanoparticle in a shear rarefied flow* [J]. | CHINESE PHYSICS B , 2021 , 30 (7) . |
| MLA | Su, Jun-Jie et al. "Effect of the particle temperature on lift force of nanoparticle in a shear rarefied flow*" . | CHINESE PHYSICS B 30 . 7 (2021) . |
| APA | Su, Jun-Jie , Wang, Jun , Xia, Guo-Dong . Effect of the particle temperature on lift force of nanoparticle in a shear rarefied flow* . | CHINESE PHYSICS B , 2021 , 30 (7) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
本发明公开了一种选择性再利用日常用水的水池分流储存重利用装置, 包括六个主要部件，四个次要零件：分流盖顶部内圈橡胶圈、分流盖内侧卡槽橡胶圈、分流盖、分流盖顶部外圈橡胶圈、卡榫轨道管、旋转卡榫圈、弹簧、弹簧座套、池口帽、分流管，共十个部分组成。使用时下压分流盖，旋转卡榫圈压缩弹簧，并沿弹簧座套管离开抬起位，在弹簧的回复力下进入闭合位，节水装置关闭；与水池底齐平，废水从卡榫轨道管流入下水管道。本发明降低了水资源无意义的浪费，提高了日常水资源的利用率，值得在实际中应用推广，本发明相关结构部件(分水装置)的制造均可行；本发明容易操作，易于推广，制造价格生活化，具有广大的经济市场和应用前景。
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| GB/T 7714 | 葛冰瑶 , 杜春旭 , 刘予琦 et al. 一种选择性再利用日常用水的水池分流储存重利用装置 : CN202110569062.4[P]. | 2021-05-25 . |
| MLA | 葛冰瑶 et al. "一种选择性再利用日常用水的水池分流储存重利用装置" : CN202110569062.4. | 2021-05-25 . |
| APA | 葛冰瑶 , 杜春旭 , 刘予琦 , 杨荞慧 , 王军 , 吴玉庭 . 一种选择性再利用日常用水的水池分流储存重利用装置 : CN202110569062.4. | 2021-05-25 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The addition of nanoparticles to a base fluid (i.e., nanofluids) is an effective strategy to achieve a higher thermal conductivity of a fluid. In a common nanofluid, the suspended nanoparticles are mostly symmetrical spheres. In the present paper, we propose to add Janus nanoparticles into a fluid (termed as Janus nanofluids), to further enhance the thermal conductivity of nanofluids. By using molecular dynamics simulations, it is found that the thermal conductivity can be distinctly improved by introducing Janus particles into the nanofluids in contrast with common nanofluids. Based on the calculation results of the molecular radial distribution function around the nanoparticle, and the diffusion coefficient of the base fluid and the Janus nanoparticle, the enhancement in the thermal conductivity of Janus nanofluids is attributed to the enhanced Brownian motion of Janus nanoparticles, which increases the probability of inter-molecular collisions and leads to enhanced energy transfer in nanofluids. The Janus nanofluids proposed in this work provide insights for the design of nanofluids with high thermal conductivity.
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| GB/T 7714 | Cui, Xin , Wang, Jun , Xia, Guodong . Enhanced thermal conductivity of nanofluids by introducing Janus particles [J]. | NANOSCALE , 2021 , 14 (1) : 99-107 . |
| MLA | Cui, Xin et al. "Enhanced thermal conductivity of nanofluids by introducing Janus particles" . | NANOSCALE 14 . 1 (2021) : 99-107 . |
| APA | Cui, Xin , Wang, Jun , Xia, Guodong . Enhanced thermal conductivity of nanofluids by introducing Janus particles . | NANOSCALE , 2021 , 14 (1) , 99-107 . |
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摘要 ：
对于气体中悬浮颗粒物的输运特性研究,一个常用的假设是悬浮颗粒的温度等于周围气体温度。但是,在有些情况下颗粒温度可能与周围气体的温度存在明显差异。例如,光泳技术中,颗粒的温度可能高于周围气体温度200K以上。本文基于气体动理论的方法,并考虑颗粒的温度效应,得到了自由分子区内纳米颗粒的曳力计算式。计算结果表明,相较于颗粒与气体的等温度假设,颗粒温度升高会增大颗粒所受的曳力;等温度假设所引起的误差随着颗粒的粒径增大而增加,当颗粒半径R<2 nm时,误差一般低于<10%,当R>3 nm时,误差可高于50%。
关键词 ：
曳力 曳力 漫反射 漫反射 温度效应 温度效应 镜面反射 镜面反射
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| GB/T 7714 | 苏俊杰 , 王军 , 夏国栋 . 自由分子区内纳米颗粒受力计算的温度效应 [C] //第十一届全国流体力学学术会议论文摘要集 . 2020 . |
| MLA | 苏俊杰 et al. "自由分子区内纳米颗粒受力计算的温度效应" 第十一届全国流体力学学术会议论文摘要集 . (2020) . |
| APA | 苏俊杰 , 王军 , 夏国栋 . 自由分子区内纳米颗粒受力计算的温度效应 第十一届全国流体力学学术会议论文摘要集 . (2020) . |
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