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学者姓名：王军
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Abstract ：
Stokes' law with stick boundary conditions has been widely accepted for the transport of microscale particles in a liquid. For nanoparticles, however, the hydrodynamic boundary conditions become unclear. In this work, the drag force acting on nanoparticles suspended in a liquid and the hydrodynamic boundary coefficient were calculated by using molecular dynamics simulations. For weak interfacial couplings, slip boundary conditions can be used to describe the particle transport, whereas at strong interfacial couplings, the hydrodynamic boundary coefficient converges to a value greater than the prediction by Stokes' law. In the present paper, we propose a density accumulation length to determine the effective particle size, which makes Stokes' law valid for nanoparticles. For a copper nanoparticle suspended in an argon liquid, the density accumulation length increases to 0.32 nm with increasing solid-liquid coupling strength. Furthermore, it is found that there exists a transition from slip to stick boundary conditions as the solid-liquid intermolecular coupling strength increases. The results presented in this work provide guidance for the prediction and manipulation of the transport properties of nanoparticles in a liquid. We propose a density accumulation length to determine the effective particle size, which makes Stokes' law valid for nanoparticles.
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| GB/T 7714 | Liu, Wangwang , Wang, Jun , Xia, Guodong et al. Drag on nanoparticles in a liquid: from slip to stick boundary conditions [J]. | NANOSCALE , 2024 , 16 (30) : 14459-14468 . |
| MLA | Liu, Wangwang et al. "Drag on nanoparticles in a liquid: from slip to stick boundary conditions" . | NANOSCALE 16 . 30 (2024) : 14459-14468 . |
| APA | Liu, Wangwang , Wang, Jun , Xia, Guodong , Li, Zhigang . Drag on nanoparticles in a liquid: from slip to stick boundary conditions . | NANOSCALE , 2024 , 16 (30) , 14459-14468 . |
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Abstract ：
With the size of high-performance electronic device decreasing (down to nanoscale), and the accompanying heat dissipation becomes a big problem due to its extremely high heat generation density. To tackle the ever-demanding heat dissipation requirement, intensive work has been done to develop techniques for chip-level cooling. Among the techniques reported in the literature, liquid cooling appears to be a good candidate for cooling high-performance electronic devices. However, when the device size is reduced to the sub-micro or nanometer level, the thermal resistance on the solid-liquid interface cannot be ignored in the heat transfer process. Usually, the interfacial thermal transport can be enhanced by using nanostructures on the solid surface because of the confinement effect of the fluid molecules filling up the nano-grooves and the increase of the solid-liquid interfacial contact area. However, in the case of weak interfacial couplings, the fluid molecules cannot enter into the nano-grooves and the interfacial thermal transport is suppressed. In the present work, the heat transfer system between two parallel metal plates filled with deionized water is investigated by molecular dynamics simulation. Electronic charges are applied to the upper plate and lower plate to create a uniform electric field that is perpendicular to the surface, and three types of nanostructures with varying size are arranged on the lower plate. It is found that the wetting state at the solid-liquid interface can change from Cassie state into Wenzel state with strength of the electric field increasing. Owing to the transition from the dewetting state to wetting state (from Wenzel to Cassie wetting state), the Kapitza length can be degraded and the solid-liquid interfacial heat transfer can be enhanced. The mechanism of the enhancing hart transfer is discussed based on the calculation of the number density distribution of the water molecules between the two plates. When the charge is further increased, electrofreezing appears, and a solid hydrogen bonding network is formed in the system, resulting in the thermal conductivity increasing to 1.2 W/(m center dot K) while the thermal conductivity remains almost constant when the electric charge continues to increase.
Keyword ：
molecular dynamics molecular dynamics nanostructure nanostructure electrowetting electrowetting solid-liquid interfacial thermal resistance solid-liquid interfacial thermal resistance external electric field external electric field
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| GB/T 7714 | Qi Kai , Zhu Xing-Guang , Wang Jun et al. Heat transfer characteristics of solid-liquid interface on nanostructure surface under external electric field [J]. | ACTA PHYSICA SINICA , 2024 , 73 (15) . |
| MLA | Qi Kai et al. "Heat transfer characteristics of solid-liquid interface on nanostructure surface under external electric field" . | ACTA PHYSICA SINICA 73 . 15 (2024) . |
| APA | Qi Kai , Zhu Xing-Guang , Wang Jun , Xia Guo-Dong . Heat transfer characteristics of solid-liquid interface on nanostructure surface under external electric field . | ACTA PHYSICA SINICA , 2024 , 73 (15) . |
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Abstract ：
The negative differential thermal resistance (NDTR) effect has received a lot of attention for its potential applications in thermal switching and thermal management. Therefore, it is crucial to explore and develop new ways to improve the NDTR performance. In this work, the influence of the surfactant on NDTR effect in the solidliquid system has been investigated by using molecular dynamics simulation. It is found that the NDTR window and the maximum heat flux through the system can be extended significantly by using surfactant. With increasing temperature differences, the surfactant molecules are deported from the high-temperature interface and adsorbed on the low-temperature interface. The wettability transition of the high-temperature interface from hydrophilic to superhydrophobic is responsible for the enhanced NDTR effect. In addition, the effect of surfactant concentration and solid-surfactant coupling strength on the NDTR effect is also examined. The results show that there is an optimal surfactant concentration and solid-surfactant coupling strength for an optimized NDTR effect. The results in this paper provide a new idea for the design of thermal thermistor.
Keyword ：
Thermal resistance Thermal resistance Negative differential thermal resistance Negative differential thermal resistance Molecular dynamics simulation Molecular dynamics simulation Solid-liquid interface Solid-liquid interface Surfactant Surfactant
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| GB/T 7714 | Li, Haiyang , Wang, Jun , Xia, Guodong et al. Enhancing negative differential thermal resistance effect at the solid-fluid interface by using surfactant: A molecular dynamics study [J]. | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2024 , 159 . |
| MLA | Li, Haiyang et al. "Enhancing negative differential thermal resistance effect at the solid-fluid interface by using surfactant: A molecular dynamics study" . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER 159 (2024) . |
| APA | Li, Haiyang , Wang, Jun , Xia, Guodong , Wen, Xiaoping , Chen, Xiangjun . Enhancing negative differential thermal resistance effect at the solid-fluid interface by using surfactant: A molecular dynamics study . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2024 , 159 . |
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Abstract ：
A thermal cloak is well known for hiding objects from thermal signature. A bilayer thermal cloak made from inner insulation layer and outer isotropic homogeneous layer could realize such thermal protection. However, its thermal protection performance can be suppressed for low-thermal-conductivity surrounding media. We propose a tri-layer thermal cloak model by adding a transition layer between the insulation layer and the outer layer. Numerical simulations and theoretical analysis show that, under the same geometry size and surrounding thermal conductivity, the performance of the thermal cloak can be significantly enhanced by introducing a transition layer with higher thermal conductivity and an outer-layer with lower thermal conductivity. The tri-layer cloak proposed provides a design guidance to realize better thermal protection using isotropic bulk materials.
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| GB/T 7714 | Shan, Qingru , Shao, Chunrui , Wang, Jun et al. Enhanced Thermal Invisibility Effect in an Isotropic Thermal Cloak with Bulk Materials [J]. | CHINESE PHYSICS LETTERS , 2023 , 40 (10) . |
| MLA | Shan, Qingru et al. "Enhanced Thermal Invisibility Effect in an Isotropic Thermal Cloak with Bulk Materials" . | CHINESE PHYSICS LETTERS 40 . 10 (2023) . |
| APA | Shan, Qingru , Shao, Chunrui , Wang, Jun , Xia, Guodong . Enhanced Thermal Invisibility Effect in an Isotropic Thermal Cloak with Bulk Materials . | CHINESE PHYSICS LETTERS , 2023 , 40 (10) . |
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Abstract ：
Thermal rectification refers to the phenomenon by which the magnitude of the heat flux in one direction is much larger than that in the opposite direction. In this study, we propose to implement the thermal rectification phenomenon in an asymmetric solid-liquid-solid sandwiched system with a nano-structured interface. By using the non-equilibrium molecular dynamics simulations, the thermal transport through the solid-liquid-solid system is examined, and the thermal rectification phenomenon can be observed. It is revealed that the thermal rectification effect can be attributed to the significant difference in the interfacial thermal resistance between Cassie and Wenzel states when reversing the temperature bias. In addition, effects of the liquid density, solid-liquid bonding strength and nanostructure size on the thermal rectification are examined. The findings may provide a new way for designs of certain thermal devices.
Keyword ：
thermal rectification thermal rectification solid-liquid interfaces solid-liquid interfaces wetting transition wetting transition interfacial thermal resistance interfacial thermal resistance
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| GB/T 7714 | Li, Haiyang , Wang, Jun , Xia, Guodong . Thermal rectification induced by Wenzel-Cassie wetting state transition on nano-structured solid-liquid interfaces [J]. | CHINESE PHYSICS B , 2023 , 32 (5) . |
| MLA | Li, Haiyang et al. "Thermal rectification induced by Wenzel-Cassie wetting state transition on nano-structured solid-liquid interfaces" . | CHINESE PHYSICS B 32 . 5 (2023) . |
| APA | Li, Haiyang , Wang, Jun , Xia, Guodong . Thermal rectification induced by Wenzel-Cassie wetting state transition on nano-structured solid-liquid interfaces . | CHINESE PHYSICS B , 2023 , 32 (5) . |
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Abstract ：
The thermophoresis of nanoparticles suspended in gas is investigated in the transition regime by molecular dynamics simulations. It is found that there exists significant discrepancy between the simulation results and the theoretical predictions for the thermophoretic force, which is attributed to the adsorption of gas molecules on nanoparticles and the gas-particle non-rigid body collisions. By using the effective particle radius, the simulation results and Talbot et al.'s equation could agree with each other in the transition regime. In addition, the effect of the finite system size of the molecular dynamics simulations is non-negligible, and the simulation results modified by effective particle radius can coincide with Phillips' equation quite well. Therefore, for particles of a few nanometers, the non-rigid body collision effect and the adsorption of gas molecules and the effective radius of the nanoparticle under strong gas-particle coupling should be taken into account in the theoretical model. The investigation presented in this paper provides guidance for the application of nanoparticles in aerosol science.
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| GB/T 7714 | Liu, Wangwang , Wang, Jun , Xia, Guodong et al. Thermophoresis of nanoparticles in the transition regime [J]. | PHYSICS OF FLUIDS , 2023 , 35 (8) . |
| MLA | Liu, Wangwang et al. "Thermophoresis of nanoparticles in the transition regime" . | PHYSICS OF FLUIDS 35 . 8 (2023) . |
| APA | Liu, Wangwang , Wang, Jun , Xia, Guodong , Li, Zhigang . Thermophoresis of nanoparticles in the transition regime . | PHYSICS OF FLUIDS , 2023 , 35 (8) . |
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Abstract ：
The thermophoresis of suspended particles in a fluid is usually from high to low temperature. In the present paper, the negative thermophoresis (from low to high temperature) of nanoparticles in liquids is investigated by molecular dynamics simulations. It is found that the solid-liquid intermolecular coupling strength has a significant effect on the direction and magnitude of the thermophoretic force. Positive thermophoresis can be observed for strong couplings, while negative thermophoresis emerges for weak couplings. The negative thermophoresis is induced by the density gradient which pushes the particle from high to low density. Based on the analysis of the potential mean force of the solid-liquid interfacial layer, it is revealed that the switch between positive and negative thermophoresis is associated with the sign change of the averaged potential mean force for the interfacial layer. Therefore, the sign of the averaged potential mean force can be used as a criterion to predict the occurrence of negative thermophoresis. The results of this work provide insights for the microscopic manipulation of nanoparticles.
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| GB/T 7714 | Liu, Wangwang , Cui, Jie , Wang, Jun et al. Negative thermophoresis of nanoparticles in liquids [J]. | PHYSICS OF FLUIDS , 2023 , 35 (3) . |
| MLA | Liu, Wangwang et al. "Negative thermophoresis of nanoparticles in liquids" . | PHYSICS OF FLUIDS 35 . 3 (2023) . |
| APA | Liu, Wangwang , Cui, Jie , Wang, Jun , Xia, Guodong , Li, Zhigang . Negative thermophoresis of nanoparticles in liquids . | PHYSICS OF FLUIDS , 2023 , 35 (3) . |
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Abstract ：
纳米流体是将纳米颗粒分散在基液形成的一种介质,具有较强的导热性能,在诸多领域具有重要的应用。纳米流体的悬浮颗粒多为球形颗粒,而在实际应用中很多颗粒为非球形。基于平衡态分子动力学模拟方法,研究了含有圆柱形纳米颗粒的纳米流体导热性能。计算结果表明,随着纳米颗粒球形度降低,纳米流体的热导率明显增大。基于纳米流体径向分布函数以及基液和纳米颗粒扩散系数的分析表明,对于相同体积的纳米颗粒,圆柱形纳米颗粒的比表面积较大,颗粒表面的类固液体层效应是非球形纳米颗粒提高纳米流体热导率的主导机制,并且颗粒的布朗运动有可能削弱此效应。该研究结果为强化纳米流体热导率提供了新的思路。
Keyword ：
纳米流体 纳米流体 圆柱形颗粒 圆柱形颗粒 热导率 热导率 径向分布函数 径向分布函数 扩散系数 扩散系数 分子动力学模拟 分子动力学模拟
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| GB/T 7714 | 王军 , 崔鑫 , 夏国栋 . 基于圆柱形纳米颗粒的纳米流体导热特性模拟 [J]. | 北京工业大学学报 , 2023 , (10) : 1116-1125 . |
| MLA | 王军 et al. "基于圆柱形纳米颗粒的纳米流体导热特性模拟" . | 北京工业大学学报 10 (2023) : 1116-1125 . |
| APA | 王军 , 崔鑫 , 夏国栋 . 基于圆柱形纳米颗粒的纳米流体导热特性模拟 . | 北京工业大学学报 , 2023 , (10) , 1116-1125 . |
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Abstract ：
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.
Keyword ：
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 . |
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Abstract ：
The solid-liquid interfacial thermal transport depends on the physical properties of the interfaces, which have been studied extensively in open literature. However, the fundamental understanding on the mechanism of the solid-liquid interfacial thermal transport is far from clear. In the present paper, heat transfer through solid-liquid interfaces is studied based on the non-equilibrium molecular dynamics simulations. It is shown that the interfacial heat transfer can be enhanced by increasing interfacial coupling strength or introducing the nanostructured surfaces. The underlying mechanism of the interfacial thermal transport is analyzed based on the calculation results of the heat flux distribution, potential mean force, and the vibrational density of states at the interfacial region. It is found that the interfacial thermal transport is dominated by the kinetic and virial contributions in the interface region. The enhancement of the interfacial heat transfer can be attributed to the fluid adsorption on the solid surface under a strong interfacial interaction or by the nanostructured solid surfaces, which reduce the mismatch of the vibrational density of states at the solid-liquid interface region.
Keyword ：
solid-liquid interface solid-liquid interface nanostructure nanostructure molecular dynamics simulation molecular dynamics simulation thermal resistance thermal resistance
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| GB/T 7714 | Li, Haiyang , Wang, Jun , Xia, Guodong . Thermal Transport through Solid-Liquid Interface: Effect of the Interfacial Coupling and Nanostructured Surfaces [J]. | JOURNAL OF THERMAL SCIENCE , 2022 , 31 (4) : 1167-1179 . |
| MLA | Li, Haiyang et al. "Thermal Transport through Solid-Liquid Interface: Effect of the Interfacial Coupling and Nanostructured Surfaces" . | JOURNAL OF THERMAL SCIENCE 31 . 4 (2022) : 1167-1179 . |
| APA | Li, Haiyang , Wang, Jun , Xia, Guodong . Thermal Transport through Solid-Liquid Interface: Effect of the Interfacial Coupling and Nanostructured Surfaces . | JOURNAL OF THERMAL SCIENCE , 2022 , 31 (4) , 1167-1179 . |
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