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学者姓名：夏国栋
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Abstract ：
In this paper, a flow boiling model consisting of an argon liquid and a copper solid wall has been developed using a molecular dynamics method to understand the effects of driving force and substrate temperature on the flow boiling characteristics at the nanoscale. The variation of parameters such as the morphology of liquid argon, the near-wall liquid temperature and heat flux are analyzed for different driving forces and substrate temperatures. The results show that the boiling onset time at lower substrate temperatures is mainly determined by the driving force, and the boiling onset time is gradually delayed as the driving force increases. The main mechanism is nucleation boiling, and the heat flux in the stabilization stage decreases with increasing driving force. In contrast, the boiling onset time at higher substrate temperatures is determined by both the substrate temperature and the driving force. At higher substrate temperature and lower driving force, atoms near the substrate are more likely to gain energy to break away from the surface, and therefore film boiling occurs, which produces a vapor film near the substrate during heating, leading to deterioration of heat transfer and a decrease in the average heat flux instead.
Keyword ：
Driving force Driving force Heat transfer Heat transfer Molecular dynamics Molecular dynamics Flow boiling Flow boiling
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| GB/T 7714 | Miao, Shanshan , Xia, Guodong , Li, Ran . Molecular dynamics simulation on flow boiling heat transfer characteristics [J]. | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2024 , 159 . |
| MLA | Miao, Shanshan 等. "Molecular dynamics simulation on flow boiling heat transfer characteristics" . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER 159 (2024) . |
| APA | Miao, Shanshan , Xia, Guodong , Li, Ran . Molecular dynamics simulation on flow boiling heat transfer characteristics . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2024 , 159 . |
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Abstract ：
A novel microchannel integrated with asymmetric cavities and coaxially water droplet ribs has been proposed to improve heat transfer, reduce thermal stress and understand the physical mechanisms in this study. The thermalhydraulic performance in the microchannel was numerically simulated at the Reynolds number (Re) from 91.8 to 458.8. It shows that utilizing the conical section of water droplet ribs as the windward side enables the Nusselt number (Nu) to reach 14.9 at Re = 321.2, while employing the circular arc as the windward side results in the Nu reaching 12 at the same Re, which are 2.04 and 1.64 times that of the conventional microchannel respectively. The physical mechanisms are explained according to the synergistic action of ribs and cavities to explain the heat transfer enhancement. Moreover, the impact of the rib column size drc on the thermal-hydraulic performance for the windward side the conical section has been analyzed. Increasing drc can further enhance the local convection heat transfer. Gradient increasing drc along the flow direction can reduce the temperature gradient while the pumping power is constant. The temperature standard deviation is reduced by about 80.5% when the pumping power is about 0.26 W for the optimized microchannels.
Keyword ：
Temperature uniformity Temperature uniformity Cavity Cavity Rib Rib Heat transfer enhancement Heat transfer enhancement Microchannel heat sink Microchannel heat sink
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| GB/T 7714 | Wang, Shenshen , Xia, Guodong , Ma, Dandan . Thermal-hydraulic performance in novel microchannels with asymmetric cavities and coaxially variable-size water droplet ribs [J]. | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2024 , 159 . |
| MLA | Wang, Shenshen 等. "Thermal-hydraulic performance in novel microchannels with asymmetric cavities and coaxially variable-size water droplet ribs" . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER 159 (2024) . |
| APA | Wang, Shenshen , Xia, Guodong , Ma, Dandan . Thermal-hydraulic performance in novel microchannels with asymmetric cavities and coaxially variable-size water droplet ribs . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2024 , 159 . |
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Abstract ：
A cooling cycle experimental apparatus with a modified metal foam porous-wall mini-channel heat sink for the linear Fresnel concentrating photovoltaic (LFPV) system was established to investigate its operation character-istics. The maximum heat flux used in the test rig of the LFPV system was about 37,000 W/m2. In this study, R141b was mixed with different volume fractions of R245fa. The cooling effect of non-azeotropic mixture of different mixing ratios under the action of electric field was experimentally studied. In steady-state experiments, the wall temperature and heat transfer coefficient of the heat sink are investigated. The experimental results showed that the heat transfer coefficient of the heat sink increased by 171% at an applied voltage of 200 V and a flow rate of 80 mL/min for the R141b/R245fa-c mixture. In the dynamic experiments, the critical heat flux of the heat sink is studied and the results showed that the critical heat flux of the R141b/R245fa-b mixture increased by 45% at an applied voltage of 200 V with a flow rate of 75 mL/min. The use of R141b/R245fa mixture with the action of the electric field can greatly enhance the performance of the cooling system and improve the operating environment of the photovoltaic system.
Keyword ：
Mini-channels Mini-channels Electric field Electric field Photovoltaic Photovoltaic R141b R141b Heat transfer Heat transfer R245fa R245fa
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| GB/T 7714 | Wang, Yacheng , Xia, Guodong , Li, Ran et al. Experimental investigation on photovoltaic cooling cycle with R141b/ R245fa mixture under the electric field [J]. | ENERGY , 2023 , 269 . |
| MLA | Wang, Yacheng et al. "Experimental investigation on photovoltaic cooling cycle with R141b/ R245fa mixture under the electric field" . | ENERGY 269 (2023) . |
| APA | Wang, Yacheng , Xia, Guodong , Li, Ran , Zhou, Wenbin , Yan, Ziheng . Experimental investigation on photovoltaic cooling cycle with R141b/ R245fa mixture under the electric field . | ENERGY , 2023 , 269 . |
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Abstract ：
本文通过液相还原法制备了水基银铜合金纳米流体,并对其吸光度、热导率和黏度进行了实验测试.结果表明,在前驱体注射流量为0.5 mL/min、反应温度为70℃和表面活性剂聚乙烯吡络烷酮(PVP)摩尔比为7的制备条件下,纳米流体的吸光度峰值呈现最高值;随着注射流量和反应温度的增加,纳米流体的热导率均呈先增大后减小的趋势,当注射流量为0.5 mL/min、流体温度为80℃时,热导率提高了16.81％;当反应温度为70℃、流体温度为40℃时,纳米流体热导率相比于去离子水提高了12.16％;纳米流体的黏度随注射流量的增加而增加,反应温度对纳米流体黏度有重要影响,在反应温度为80℃时,所制备的纳米流体黏度最高,其相比于25℃去离子水黏度增加了 30％.
Keyword ：
银铜合金 银铜合金 纳米流体 纳米流体 稳定性 稳定性 黏度 黏度 热导率 热导率
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| GB/T 7714 | 闫佳 , 夏国栋 , 马丹丹 . 银铜合金纳米流体的热物性影响因素分析 [J]. | 工程热物理学报 , 2023 , 44 (1) : 131-136 . |
| MLA | 闫佳 et al. "银铜合金纳米流体的热物性影响因素分析" . | 工程热物理学报 44 . 1 (2023) : 131-136 . |
| APA | 闫佳 , 夏国栋 , 马丹丹 . 银铜合金纳米流体的热物性影响因素分析 . | 工程热物理学报 , 2023 , 44 (1) , 131-136 . |
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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 ：
A metal foam porous-wall mini-channels heat sink is proposed to solve the heat dissipation problem of linear Fresnel reflection photovoltaic (LFR-PV) system. This paper compares the heat transfer performance of the metal foam porous-wall mini-channels heat sink and the rectangular mini-channels heat sink under different working conditions by method of experimental investigation. The research results show that metal foam porous wall mini -channels heat sink performs larger annular flow area so that the heat transfer performance is better. Compared with rectangular mini-channels of the same size, the heat transfer coefficient is improved by 135% in the same size. Due to the addition of metal foam, the local heat flow distribution in the heat sink changes, and the wall temperature distribution of the heat sink is more uniform.
Keyword ：
Heat and mass transfer Heat and mass transfer Mini-channels Mini-channels Metal foam Metal foam Linear Fresnel Linear Fresnel
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| GB/T 7714 | Xia, Guodong , Wang, Yacheng , Li, Ran et al. Experimental study of boiling heat transfer characteristics of metal foam porous-wall mini-channels [J]. | INTERNATIONAL JOURNAL OF REFRIGERATION , 2023 , 151 : 278-289 . |
| MLA | Xia, Guodong et al. "Experimental study of boiling heat transfer characteristics of metal foam porous-wall mini-channels" . | INTERNATIONAL JOURNAL OF REFRIGERATION 151 (2023) : 278-289 . |
| APA | Xia, Guodong , Wang, Yacheng , Li, Ran , Yan, Ziheng , Li, Qi . Experimental study of boiling heat transfer characteristics of metal foam porous-wall mini-channels . | INTERNATIONAL JOURNAL OF REFRIGERATION , 2023 , 151 , 278-289 . |
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Abstract ：
Spatial phase distributions for various flow patterns and two phase flow frictional pressure drops of air-water flow in a horizontal helically coiled rectangular tube were experimentally investigated at the liquid and gas superficial velocities of 0.11-2 m/s and 0.13-16 m/s. Local void factions in the helically coiled tube were measured with electric conductivity probes and the corresponding flow regimes were recorded with a high-speed video camera simultaneously. The local void fractions and spatial phase distributions for various flow regimes were analyzed according to the physical mechanisms. The spatial phase distributions of gas liquid two-phase flow in the helically coiled tube are mainly affected by the gravitational and centrifugal forces. The measured single-phase flow and two-phase flow pressure drops have been analyzed for various flow regimes. A correlation was proposed to predict the friction pressure drop of single-phase flow in the helically coiled tube. The existing gas-liquid two-phase pressure drop frictional correlations were compared to the experimental frictional pressure drop data. The Awwad et al. correlation [Int. J. Multiphase Flow, 21 (1995), 607-619] predicts 91 % of the experimental data within +/- 30 %.
Keyword ：
Friction pressure drop Friction pressure drop Spatial phase distribution Spatial phase distribution Two-phase flow Two-phase flow Helically coiled rectangular tube Helically coiled rectangular tube Electric conductivity probe Electric conductivity probe Local void fraction Local void fraction Flow regime Flow regime
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| GB/T 7714 | Cai, Bo , Xia, Guodong , Cheng, Lixin et al. Experimental investigation on spatial phase distributions for various flow patterns and frictional pressure drop characteristics of gas liquid two-phase flow in a horizontal helically coiled rectangular tube [J]. | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2023 , 142 . |
| MLA | Cai, Bo et al. "Experimental investigation on spatial phase distributions for various flow patterns and frictional pressure drop characteristics of gas liquid two-phase flow in a horizontal helically coiled rectangular tube" . | EXPERIMENTAL THERMAL AND FLUID SCIENCE 142 (2023) . |
| APA | Cai, Bo , Xia, Guodong , Cheng, Lixin , Wang, Zhipeng . Experimental investigation on spatial phase distributions for various flow patterns and frictional pressure drop characteristics of gas liquid two-phase flow in a horizontal helically coiled rectangular tube . | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2023 , 142 . |
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Abstract ：
一种低热阻低泵功的阵列热源的微通道散热集成系统，属于强化换热领域。包括三层结构，依次为顶板、分流板、底板。分流板背面加工流体进口、进液分流槽道、注液孔、一级H型分流槽道分支、二级H型分流槽道分支、末端槽道；正面加工流体出口、出液合流槽道、微通道和蓄液区槽道、合流槽道分支、一级H型分流槽道分支、二级H型分流槽道分支、汇液槽道。多个热源阵列布置于顶板上，分流板焊于顶板与底板之间，形成完整的系统。本发明针对每个热源，采用“两进三出”的结构，缩短了流体在微通道中的流动长度，抑制热量在流道末端的积聚，提高热源表面的温度均匀性。系统内各槽道采用对称原则，保证系统内流体分配均匀性，有利于同时对多热源散热。
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| GB/T 7714 | 夏国栋 , 张柱 , 马丹丹 . 一种低热阻低泵功的阵列热源的微通道散热集成系统 : CN202222249395.1[P]. | 2022-08-23 . |
| MLA | 夏国栋 et al. "一种低热阻低泵功的阵列热源的微通道散热集成系统" : CN202222249395.1. | 2022-08-23 . |
| APA | 夏国栋 , 张柱 , 马丹丹 . 一种低热阻低泵功的阵列热源的微通道散热集成系统 : CN202222249395.1. | 2022-08-23 . |
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Abstract ：
一种低热阻低泵功稳定性好的歧管微通道散热器，属于强化换热领域。自上而下包含盖板(1)、歧管分流板(2)和微通道基板(4)；盖板(1)上加工有与外部管道连接的通孔，分别是流体入口(10)和流体出口(11)；歧管分流板(2)上加工有入口储液池(7)、入口歧管通道(8)、出口歧管通道(3)以及出口储液池(9)；微通道基板包含由微通道(5)和限流通道(6)构成的一系微通道散热单元。在歧管通道下方布置限流通道。通过在歧管通道下方布置限流通道，大幅度改善了垂直于微通道方向的壁面温度分布；本申请涉及的歧管微通道能有效降低壁面最大温度，改善壁面温度分布，以满足高功率器件的散热需求。
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| GB/T 7714 | 夏国栋 , 王申申 , 马丹丹 . 一种低热阻低泵功稳定性好的歧管微通道散热器 : CN202222324005.2[P]. | 2022-09-01 . |
| MLA | 夏国栋 et al. "一种低热阻低泵功稳定性好的歧管微通道散热器" : CN202222324005.2. | 2022-09-01 . |
| APA | 夏国栋 , 王申申 , 马丹丹 . 一种低热阻低泵功稳定性好的歧管微通道散热器 : CN202222324005.2. | 2022-09-01 . |
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Abstract ：
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.
Keyword ：
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 et al. "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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