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学者姓名：王军
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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 ：
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 ：
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 ：
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 ：
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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Abstract ：
The self-propulsion of a Janus particle suspended in a dilute gas at equilibrium is investigated in the free molecular regime. The Janus particle consists of two hemispheres with different momentum accommodation factors; the particle and the surrounding gas are held at different constant temperatures. Based on the gas kinetic theory, we calculate the particle's self-propulsion and drag force. We conclude that self-propulsion occurs only under the condition that the particle is hotter/colder than the suspension gas, and the self-propulsion force is proportional to the difference of the momentum accommodation factors and directed along the symmetry axis. The drag force, instead, is corrected by a term proportional to the average of the momentum accommodation factors. Our analytical results are confirmed by numerical Monte Carlo simulations.
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| GB/T 7714 | Zhang, Kexue , Xu, Liyuan , Li, Yunyun et al. Self-propulsion of Janus particles in the free molecular regime [J]. | PHYSICS OF FLUIDS , 2022 , 34 (3) . |
| MLA | Zhang, Kexue et al. "Self-propulsion of Janus particles in the free molecular regime" . | PHYSICS OF FLUIDS 34 . 3 (2022) . |
| APA | Zhang, Kexue , Xu, Liyuan , Li, Yunyun , Marchesoni, Fabio , Wang, Jun , Xia, Guodong . Self-propulsion of Janus particles in the free molecular regime . | PHYSICS OF FLUIDS , 2022 , 34 (3) . |
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Abstract ：
Aerosol particles suspended in a diluted gas with non-uniform temperature distribution are expected to experience a thermophoretic force. In theoretical treatment of thermophoresis, it is usually assumed that the particle temperature is equal to the surrounding gas temperature. However, this might not always be the case. In some particular applications, the particle temperature can significantly differ from the gas temperature. In the present paper, we theoretically investigate the effect of the particle temperature on the thermophoresis of nanoparticles in the free molecule regime. Theoretical formulas for the thermophoretic force and thermophoretic velocity are obtained based on the gas kinetic theory. As examples, a spherical Ag nanoparticle suspended in a dilute He gas is considered, and the Rudyak-Krasnolutski potential is employed to model the gas-particle interaction. It is found that the influence of the particle temperature on the thermophoresis of nanoparticles can be significant. With increasing particle size, the error due to the equal gas-particle temperature assumption can be neglected. (c) 2021 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
Keyword ：
Nanoparticles Nanoparticles Thermophoresis Thermophoresis Free molecule regime Free molecule regime Particle temperature Particle temperature
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| GB/T 7714 | Su, Junjie , Cui, Jie , Wang, Jun et al. Thermophoresis of nanoparticles hotter/colder than the surrounding dilute gases [J]. | PARTICUOLOGY , 2022 , 63 : 95-102 . |
| MLA | Su, Junjie et al. "Thermophoresis of nanoparticles hotter/colder than the surrounding dilute gases" . | PARTICUOLOGY 63 (2022) : 95-102 . |
| APA | Su, Junjie , Cui, Jie , Wang, Jun , Xia, Guodong . Thermophoresis of nanoparticles hotter/colder than the surrounding dilute gases . | PARTICUOLOGY , 2022 , 63 , 95-102 . |
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Abstract ：
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.
Keyword ：
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 . |
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Abstract ：
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.
Keyword ：
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) . |
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