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学者姓名：夏国栋
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摘要 ：
The dramatic development in electronics results in an increasing cooling challenge. Nucleate pool boiling, as an efficient phase-change heat transfer technology without external energy consumption, is highly promising for sustainable high-heat-flux dissipation. To facilitate the design of boiling surfaces, an explicit understanding of effects of further reinforcements in the solid-liquid interaction on nucleate boiling over superhydrophilic surfaces is urgently desired. Whereas, it is considerably difficult to implement the relevant study and elucidate the underlying mechanism by current experimental approaches. Here, utilizing molecular dynamics simulations, effects of solid-liquid interactions on nucleate boiling over superhydrophilic surfaces are quantitatively illustrated. Our results manifest that, even for superhydrophilic surfaces, the bubble nucleation, growth and critical-heat-flux in nanoscale sense can be still strikingly enhanced with the improvement of solid-liquid interaction. Attractively, an optimal interaction energy coefficient (alpha = 1.5) for achieving maximal boiling enhancement is obtained in this study. The enhanced mechanism is elaborated by the heat transfer efficiency at the solid-liquid interface and energy barrier for phase-change. Additionally, it is found that conducting separate energy analyses for different liquid layers near the substrate is vital to reveal microscopic mechanisms thoroughly. This study provides significant guidance towards surface design in state-of-the-art thermal management systems.
关键词 ：
Boiling enhancement Boiling enhancement Potential energy barrier Potential energy barrier Molecular dynamics Molecular dynamics Heat transfer efficiency Heat transfer efficiency Superhydrophilic Superhydrophilic Solid-liquid interactions Solid-liquid interactions
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| GB/T 7714 | Zhou, Wenbin , Han, Dongmei , Xia, Guodong . Maximal enhancement of nanoscale boiling heat transfer on superhydrophilic surfaces by improving solid-liquid interactions: Insights from molecular dynamics [J]. | APPLIED SURFACE SCIENCE , 2022 , 591 . |
| MLA | Zhou, Wenbin 等. "Maximal enhancement of nanoscale boiling heat transfer on superhydrophilic surfaces by improving solid-liquid interactions: Insights from molecular dynamics" . | APPLIED SURFACE SCIENCE 591 (2022) . |
| APA | Zhou, Wenbin , Han, Dongmei , Xia, Guodong . Maximal enhancement of nanoscale boiling heat transfer on superhydrophilic surfaces by improving solid-liquid interactions: Insights from molecular dynamics . | APPLIED SURFACE SCIENCE , 2022 , 591 . |
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摘要 ：
Nanostructured surfaces have been proved to bring remarkable enhancements in nucleate boiling heat transfer, which are particularly attractive in thermal energy fields. To fully understand the effects of nano cavities on nucleate boiling and elucidate the underlying enhanced mechanisms, a comparative molecular dynamics study on nucleate pool boiling heat transfer of liquid argon over the plain copper substrate and nanostructured substrates with different rectangular cavities is performed. The nano-cavities have the same depth of 5 nm and different widths of 3 nm, 5 nm and 8 nm. The bubble dynamics behavior on various surfaces is observed based on simulation snapshots. The results manifest that the rectangular nano-cavity can significantly reduce time and wall superheat required for the onset of nucleate boiling, as well as delay the transition from nucleation boiling regime to film boiling regime. The incipient nucleation time tin can be reduced to 990 ps from 5600 ps. Additionally, compared with the plain substrate, the rectangular nano-cavity can result in a striking decrease in boiling initiation temperature, which is up to 59 K. The underlying enhanced mechanisms are well elucidated based on the structural feature of the rectangular nano-cavity and simulation results. The liquid inside the rectangular cavity can obtain additional thermal energy from sidewalls, leading to a significant local heat accumulation effect and the heat transfer efficiency reinforcement. It is found there is a coupling enhancement effect of heat accumulation when the width of rectangular cavity is smaller. Consequently, the 3 nm wide nano-cavity can achieve maximum enhancement. These findings provide crucial evidence at the nanoscale to verify that nano-cavity can significantly enhance nucleate boiling not only by reducing nucleation time but also by decreasing the boiling initiation temperature. This study is of importance to promote further insights into the enhanced mechanism of nucleate boiling at the nanoscale and provide guidance for the performance improvement in boiling surfaces for advanced thermal energy systems. (c) 2022 Elsevier Ltd. All rights reserved.
关键词 ：
Molecular dynamics Molecular dynamics Boiling initiation temperature Boiling initiation temperature Nucleate boiling Nucleate boiling Heat accumulation effect Heat accumulation effect Nano-cavity Nano-cavity
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| GB/T 7714 | Zhou, Wenbin , Han, Dongmei , Ma, Hualin et al. Molecular dynamics study on enhanced nucleate boiling heat transfer on nanostructured surfaces with rectangular cavities [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2022 , 191 . |
| MLA | Zhou, Wenbin et al. "Molecular dynamics study on enhanced nucleate boiling heat transfer on nanostructured surfaces with rectangular cavities" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 191 (2022) . |
| APA | Zhou, Wenbin , Han, Dongmei , Ma, Hualin , Hu, Yanke , Xia, Guodong . Molecular dynamics study on enhanced nucleate boiling heat transfer on nanostructured surfaces with rectangular cavities . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2022 , 191 . |
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摘要 ：
In this study, by using the nonequilibrium molecular dynamics and the kinetic theory, we examine the tailored nanoscale thermal transport via a gas-filled nanogap structure with mechanically-controllable nanopillars in one surface only, i.e., changing nanopillar height. It is found that both the thermal rectification and negative differential thermal resistance (NDTR) effects can be substantially enhanced by controlling the nanopillar height. The maximum thermal rectification ratio can reach 340% and the increment T range with NDTR can be significantly enlarged, which can be attributed to the tailored asymmetric thermal resistance via controlled adsorption in height-changing nanopillars, especially at a large temperature difference. These tunable thermal rectification and NDTR mechanisms provide insights for the design of thermal management systems.
关键词 ：
thermal rectification thermal rectification negative differential thermal resistance negative differential thermal resistance kinetic theory kinetic theory nanopillars nanopillars
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| GB/T 7714 | Li Fan , Li Haiyang , Wang Jun et al. Tunable Thermal Rectification and Negative Differential Thermal Resistance in Gas-Filled Nanostructure with Mechanically-Controllable Nanopillars [J]. | JOURNAL OF THERMAL SCIENCE , 2022 , 31 (4) : 1084-1093 . |
| MLA | Li Fan et al. "Tunable Thermal Rectification and Negative Differential Thermal Resistance in Gas-Filled Nanostructure with Mechanically-Controllable Nanopillars" . | JOURNAL OF THERMAL SCIENCE 31 . 4 (2022) : 1084-1093 . |
| APA | Li Fan , Li Haiyang , Wang Jun , Xia Guodong , Hwang, Gisuk . Tunable Thermal Rectification and Negative Differential Thermal Resistance in Gas-Filled Nanostructure with Mechanically-Controllable Nanopillars . | JOURNAL OF THERMAL SCIENCE , 2022 , 31 (4) , 1084-1093 . |
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摘要 ：
基于非平衡态分子动力学模拟方法,研究了自由分子区内纳米颗粒的热泳特性.理论研究表明,纳米颗粒与周围气体分子之间的非刚体碰撞效应会明显地改变其热泳特性,经典的Waldmann热泳理论并不适用,但尚未有定量的直接验证.模拟计算结果表明:对于纳米颗粒而言,当气-固相互作用势能较弱或气体温度较高时,气体分子与纳米颗粒之间的非刚体碰撞效应可以忽略, Waldmann热泳理论与分子动力学模拟结果吻合较好;当气-固相互作用势能较强或气体温度较低时,非刚体碰撞效应较为明显, Waldmann热泳理论与模拟结果存在较大误差.基于分子动力学模拟结果,对纳米颗粒的等效粒径进行了修正,并考虑了气体分子与纳米颗粒之间的...
关键词 ：
自由分子区 自由分子区 分子动力学模拟 分子动力学模拟 纳米颗粒 纳米颗粒 热泳力 热泳力
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| GB/T 7714 | 崔杰 , 苏俊杰 , 王军 et al. 自由分子区内纳米颗粒的热泳力计算 [J]. | 物理学报 , 2021 , 70 (05) : 242-250 . |
| MLA | 崔杰 et al. "自由分子区内纳米颗粒的热泳力计算" . | 物理学报 70 . 05 (2021) : 242-250 . |
| APA | 崔杰 , 苏俊杰 , 王军 , 夏国栋 , 李志刚 . 自由分子区内纳米颗粒的热泳力计算 . | 物理学报 , 2021 , 70 (05) , 242-250 . |
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摘要 ：
文中提出了一种局部加密的新型正弦波纹微通道,采用数值模拟的方法研究局部加密位置(上游、中部、下游)对波纹微通道流动换热性能的影响.结果表明,较矩形直通道,波纹微通道的传热性能显著提高,底面最大温差大幅降低.这主要归结于波纹形状的弯曲壁面使流体产生扰动,促进了流体混合;波纹微通道增加了对流换热面积,增强了对流换热效果.局部加密波纹微通道结构可以进一步促进对流换热,同时也带来流动阻力的增大.在相同泵功下,局部加密型微通道的换热性能由差到好排序依次为上游加密型、中部加密型、下游加密型,较矩形微通道,下游加密的微通道结构的热阻降低了1.54倍～2.15倍.下游加密型微通道促进了流体混合使换热增强,有效改善了通道尾部由于热边界层变厚带来的换热恶化问题.
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| GB/T 7714 | 张晓蒙 , 马丹丹 , 夏国栋 . 局部加密的正弦波纹微通道强化传热的数值研究 [J]. | 东北电力大学学报 , 2021 , 41 (4) : 43-51 . |
| MLA | 张晓蒙 et al. "局部加密的正弦波纹微通道强化传热的数值研究" . | 东北电力大学学报 41 . 4 (2021) : 43-51 . |
| APA | 张晓蒙 , 马丹丹 , 夏国栋 . 局部加密的正弦波纹微通道强化传热的数值研究 . | 东北电力大学学报 , 2021 , 41 (4) , 43-51 . |
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摘要 ：
自由分子区内纳米颗粒的热泳力计算
关键词 ：
分子动力学模拟 分子动力学模拟 热泳力 热泳力 纳米颗粒 纳米颗粒 自由分子区 自由分子区
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| GB/T 7714 | 崔杰 , 苏俊杰 , 王军 et al. 自由分子区内纳米颗粒的热泳力计算 [J]. | 崔杰 , 2021 , 70 (5) : 236-244 . |
| MLA | 崔杰 et al. "自由分子区内纳米颗粒的热泳力计算" . | 崔杰 70 . 5 (2021) : 236-244 . |
| APA | 崔杰 , 苏俊杰 , 王军 , 夏国栋 , 李志刚 , 物理学报 . 自由分子区内纳米颗粒的热泳力计算 . | 崔杰 , 2021 , 70 (5) , 236-244 . |
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摘要 ：
以乙二醇为基液和还原剂,四氯化锡、氯铂酸为氧化剂,采用微流控法合成了铂锡合金纳米流体,并添加了不同比例的聚乙烯吡咯酮(PVP)作为表面活性剂,分别利用紫外可见分光光度计和Hot Disk热物性分析仪测得纳米流体的吸光度值和导热系数,分析了反应温度及PVP的添加比对纳米流体的稳定性、热导率的影响.结果表明,纳米流体导热系数的增长率随反应温度的升高近乎呈现线性增长,虽然稳定性略有下降,但影响不大.添加不同比例的表面活性剂可以有效改善纳米流体的稳定性和导热性能,但存在最佳的添加比例.反应温度为200℃,添加PVP的量为Pt、Sn物质的量浓度和的4倍时制得的铂锡合金纳米流体在温度为60℃下的导热性能提...
关键词 ：
乙二醇 乙二醇 导热系数 导热系数 微流控 微流控 稳定性 稳定性 表面活性剂 表面活性剂 铂锡合金纳米流体 铂锡合金纳米流体
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| GB/T 7714 | 夏国栋 , 李奥 , 马丹丹 . 铂锡合金纳米流体导热系数与稳定性影响因素分析 [J]. | 北京工业大学学报 , 2021 , 47 (09) : 1056-1063 . |
| MLA | 夏国栋 et al. "铂锡合金纳米流体导热系数与稳定性影响因素分析" . | 北京工业大学学报 47 . 09 (2021) : 1056-1063 . |
| APA | 夏国栋 , 李奥 , 马丹丹 . 铂锡合金纳米流体导热系数与稳定性影响因素分析 . | 北京工业大学学报 , 2021 , 47 (09) , 1056-1063 . |
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摘要 ：
The need to understand the flow behavior and film thickness in the single screw expander is very crucial since it is known to be a complex system due to the existence of various flow patterns. The present work reports a computational fluid dynamic analysis of two-phase flow behavior and film thickness through a vertical helical rectangular channel using the volume of fluid (VOF) model. The numerical model is validated against available experimental data of annular flow in the helical rectangular channel. The numerical predictions of velocity field, pressure field and liquid phase distribution are presented as each fluid flows into the helical channel. It is found that the inlet flow inclined angle has a significant influence on the liquid film distribution at the outer side of the helical channel. The effects of curvature ratio and dimensionless pitch on the liquid film distribution, film thickness and liquid holdup are illustrated in detail. In addition, the new relationship between the average liquid film thickness and the liquid holdup is also given, and these results are necessary for the optimization design of the single screw expander prototype. © 2020 Elsevier Ltd
关键词 ：
Screws Screws Liquid films Liquid films Velocity Velocity Two phase flow Two phase flow Film thickness Film thickness Computational fluid dynamics Computational fluid dynamics
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| GB/T 7714 | Liu, Xianfei , Zhang, Hui , Wang, Fang et al. Numerical investigation of flow behavior and film thickness in the single screw expander [J]. | International Journal of Mechanical Sciences , 2021 , 190 . |
| MLA | Liu, Xianfei et al. "Numerical investigation of flow behavior and film thickness in the single screw expander" . | International Journal of Mechanical Sciences 190 (2021) . |
| APA | Liu, Xianfei , Zhang, Hui , Wang, Fang , Xia, Guodong , Li, Zhiqiang , Zhu, Caixia et al. Numerical investigation of flow behavior and film thickness in the single screw expander . | International Journal of Mechanical Sciences , 2021 , 190 . |
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摘要 ：
Liquid evaporation and the associated vapor transport in micro/nanopores are ubiquitous in nature and play an important role in industrial applications. Accurate modeling of the liquid evaporation process in nanopores is critical to achieving a better design of devices for enhanced evaporation. Although having high impact on evaporation rate, vapor transport resistance in micro/nanopores remains incompletely understood. In this study, we proposed a new model which, for the first time, considered vapor transport in finite-length pores under various Knudsen regimes and then coupled the transport resistance to liquid evaporation. Direct Simulation Monte Carlo and laboratory experiments were conducted to provide validation for our model. The model successfully predicts the variation of pore transmissivity with Knudsen number and nanopore size, which cannot be revealed by prior theories. The relative error of model-predicted evaporation rate was within 1% in L/r = 0 cases and within 3.5% in L/r > 0 cases. Our model is featured by its applicability under the entire range of Knudsen numbers. The evaporation of various types of liquids in arbitrarily sized pores can be modeled using a universal relation.
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| GB/T 7714 | Li Ran , Wang Jiahao , Xia Guodong . New Model for Liquid Evaporation and Vapor Transport in Nanopores Covering the Entire Knudsen Regime and Arbitrary Pore Length. [J]. | Langmuir : the ACS journal of surfaces and colloids , 2021 , 37 (6) : 2227-2235 . |
| MLA | Li Ran et al. "New Model for Liquid Evaporation and Vapor Transport in Nanopores Covering the Entire Knudsen Regime and Arbitrary Pore Length." . | Langmuir : the ACS journal of surfaces and colloids 37 . 6 (2021) : 2227-2235 . |
| APA | Li Ran , Wang Jiahao , Xia Guodong . New Model for Liquid Evaporation and Vapor Transport in Nanopores Covering the Entire Knudsen Regime and Arbitrary Pore Length. . | Langmuir : the ACS journal of surfaces and colloids , 2021 , 37 (6) , 2227-2235 . |
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摘要 ：
Thermophoresis refers to the motion of small particles suspending in a fluid with non-uniform temperature distribution due to the temperature gradient around the particle. Usually, the fluid molecules coming from the hot side carry more kinetic energy than those from the cold side, which results in a net thermophoretic force in the direction opposite to the temperature gradient. Since it was discovered more than 100 years ago, thermophoresis has been of major importance in a variety of applications, where it can play either beneficial role or adverse role, including material synthesis, micro- and nano-fabrication, and environmental science. Therefore, it is necessary to accurately evaluate the thermophoretic force. In the present work, the thermophoretic force on nanoparticles is examined in the free molecule regime by using non-equilibrium molecule dynamics (MD) simulation. It has been widely accepted that the thermophoretic force conforms with the Waldmann equation for large Knudsen numbers. However, due to the effect of the nonrigid-body interactions between the particle and gas molecules, the thermophoretic force on nanoparticles might deviate greatly from the classical theory. In our MD model, a single nanoparticle with a diameter of several nanometers suspends in a diluted gas. The Lennard-Jones (L-J) potential is employed to simulate the intermolecular interactions. To avoid deforming the nanoparticle, the solid molecules within the nanoparticles are linked to their nearest neighbors through a finite extensible nonlinear elastic bonding potential. The thermophoretic force on a nanoparticle is calculated by imposing a harmonic potential on the nanoparticle, which eliminates the effect of the Brownian motion of the nanoparticle on the thermophoresis. The effective thermal conductivity of the ambient gas is employed in Waldmann equation for the thermophoretic force due to the finite volume effect. It is found that the Waldmann theory for thermophoresis is still valid for nanoparticles in the case of weak gas-particle interaction or high gas temperature. With the increase of the gas-particle interaction strength or the decrease of the gas temperature, the Waldmann theory is invalid due to the effect of gas-particle nonrigid-body collisions and the adsorption of gas molecules on the particle surface. By considering the gas-particle nonrigid-body interaction and the modified particle size, the theoretical results for thermophoretic force accord with the MD simulations quite well.
关键词 ：
free molecule regime free molecule regime molecular dynamics molecular dynamics nanoparticle nanoparticle thermophoretic force thermophoretic force
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| GB/T 7714 | Cui Jie , Su Jun-Jie , Wang Jun et al. Thermophoretic force on nanoparticles in free molecule regime [J]. | ACTA PHYSICA SINICA , 2021 , 70 (5) . |
| MLA | Cui Jie et al. "Thermophoretic force on nanoparticles in free molecule regime" . | ACTA PHYSICA SINICA 70 . 5 (2021) . |
| APA | Cui Jie , Su Jun-Jie , Wang Jun , Xia Guo-Dong , Li Zhi-Gang . Thermophoretic force on nanoparticles in free molecule regime . | ACTA PHYSICA SINICA , 2021 , 70 (5) . |
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