Query：
学者姓名：夏国栋
Refining：
Year
Type
Indexed by
Source
Complex
Co-Author
Language
Clean All
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
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
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
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
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
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
Enhancing boiling heat transfer and elaborating underlying mechanisms are of great significance to assist in improving the efficiency of energy systems and solving thermal management bottlenecks in advanced electronics. Numerous experimental studies have proved nanostructured surfaces enable boiling heat transfer to be enhanced strikingly. Nevertheless, it is a great challenge to perform more in-depth research due to the limitation of the observation accuracy of conventional experimental approaches. To optimize designs of nanostructured boiling surfaces and fully reveal the microscopic mechanisms, the aspect-ratio effects of rectangular nano-cavities on nucleate boiling heat transfer are investigated systematically by molecular dynamics simulations in this study. The nano-cavities have the same width of 3 nm and different depths of 2 nm to 8 nm, corresponding to aspect ratios from 2:3 to 8:3. The results illustrate that, compared with the plain surface, concave nanostructured surfaces can cause a significant heat accumulation effect, resulting in remarkable reinforcements in absorbed heat flux and bubble nucleation. The nucleate boiling heat transfer enhancements originating from large-aspect-ratio nano-cavities are fully verified by the notable reductions in the incipient nucleation time and boiling initiation temperature. Attractively, for cavities with the same width, an optimal depth for maximal nucleate boiling enhancement can be obtained, which is 7 nm in the present study. In this case, the incipient nucleation time is about eight times shorter than that for the plain substrate and the decrease in boiling initiation temperature is up to 53 K. Moreover, a novel and straightforward insight into the microscopic enhanced mechanism has been proposed. It is elucidated thoroughly from the perspective of the thermal energy accumulation of liquid at the initial nucleation site by taking into account the heat absorbed from the solid wall and the heat transferred to the adjacent cryogenic liquid comprehensively. These analysis and simulation results are in great agreement. This study provides significant guidance for state-of-the-art two-phase thermal management applications.(c) 2022 Elsevier Ltd. All rights reserved.
Keyword ：
Molecular dynamics Molecular dynamics Microscopic mechanisms Microscopic mechanisms Boiling initiation temperature Boiling initiation temperature Large aspect ratio Large aspect ratio Nucleate boiling enhancement Nucleate boiling enhancement Nanostructured surface Nanostructured surface
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Zhou, Wenbin , Han, Dongmei , Ma, Hualin et al. Microscopic mechanisms behind nucleate boiling heat transfer enhancement on large-aspect-ratio concave nanostructured surfaces for two-phase thermal management [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2022 , 195 . |
| MLA | Zhou, Wenbin et al. "Microscopic mechanisms behind nucleate boiling heat transfer enhancement on large-aspect-ratio concave nanostructured surfaces for two-phase thermal management" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 195 (2022) . |
| APA | Zhou, Wenbin , Han, Dongmei , Ma, Hualin , Hu, Yanke , Xia, Guodong . Microscopic mechanisms behind nucleate boiling heat transfer enhancement on large-aspect-ratio concave nanostructured surfaces for two-phase thermal management . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2022 , 195 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
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.
Keyword ：
Molecular dynamics Molecular dynamics Boiling initiation temperature Boiling initiation temperature Nucleate boiling Nucleate boiling Heat accumulation effect Heat accumulation effect Nano-cavity Nano-cavity
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
Capillary-driven evaporation of liquids play an important role in the thermal management of electronic devices. The recently developed nano-porous evaporator supported by microchannels proved to be promising in heat dissipation and energy saving. In this work, we proposed novel modifications to the nano-porous evaporator structure which could simultaneously enhance the dry-out heat flux and heat transfer coefficient. These include a non-uniformly distributed nanopore size and a membrane with shortened length. By conserving the farthest nanopore size and enlarging the closer nanopores, or simply removing part of the membrane, the pressure drop and thermal resistance of the evaporator were both minimized. Numerical approach was developed for simulating the heat transfer and fluid flow in the nano-porous evaporator. Kinetic boundary conditions were applied at the liquid-vapor interface to simulate evaporation. Results of temperature and pressure fields were obtained. It was found that the evaporative thermal resistance and the pressure drop in microchannel played dominant roles in determining the evaporator performance. The structure with partial membrane 10 mu m in length had the best heat dissipation performance, which improved the dry-out heat flux and heat transfer coefficient by 22.3% and 139.5%, respectively, compared to the benchmark evaporator structure.
Keyword ：
Nano-porous membrane Nano-porous membrane Structural modification Structural modification Evaporation Evaporation Electronics cooling Electronics cooling Capillary wicks Capillary wicks
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Li, Ran , Xia, Guodong . Improved heat dissipation performance of nano-porous wicking evaporator by structural modification: A numerical study [J]. | APPLIED THERMAL ENGINEERING , 2022 , 212 . |
| MLA | Li, Ran et al. "Improved heat dissipation performance of nano-porous wicking evaporator by structural modification: A numerical study" . | APPLIED THERMAL ENGINEERING 212 (2022) . |
| APA | Li, Ran , Xia, Guodong . Improved heat dissipation performance of nano-porous wicking evaporator by structural modification: A numerical study . | APPLIED THERMAL ENGINEERING , 2022 , 212 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
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.
Keyword ：
thermal rectification thermal rectification negative differential thermal resistance negative differential thermal resistance kinetic theory kinetic theory nanopillars nanopillars
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
Flow boiling in multi micro-channel evaporators is a promising approach to cooling high heat flux in many devices. Understanding of the fundamentals of flow boiling in multi microchannel evaporators is urgently needed. This paper presents a critical review on the research of flow boiling phenomena in microchannels. First, classifications of macro- and micro-channels are briefed. Then, studies on flow boiling in multi microchannels with plain surface are analyzed. Next, studies of flow boiling in multi microchannels with various enhanced technologies are analyzed. Finally, heat transfer mechanisms and development of prediction methods are discussed. According to the critical review and analysis of the current research on the fundamental issues and challenges of flow boiling in micro-channels, future research needs have been identified and recommended. In general, systematic, and accurate experimental data of flow boiling in micro-channels are needed by using advanced measurement technologies. In particular, optimal design of microchannel evaporators with plain surface and enhanced structures is lacking and should be investigated. The physical mechanisms of flow boiling should be further investigated based on the corresponding flow patterns. Furthermore, mechanistic prediction methods should be developed. Furthermore, systematic experimental, analytical and modeling studies on transient flow boiling phenomena in micro-channels should be conducted to understand the physical mechanisms and develop the theoretical models.
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Cheng, Lixin , Xia, Guodong . High Heat Flux Cooling Technologies Using Microchannel Evaporators: Fundamentals and Challenges [J]. | HEAT TRANSFER ENGINEERING , 2022 , 44 (16-18) : 1470-1497 . |
| MLA | Cheng, Lixin et al. "High Heat Flux Cooling Technologies Using Microchannel Evaporators: Fundamentals and Challenges" . | HEAT TRANSFER ENGINEERING 44 . 16-18 (2022) : 1470-1497 . |
| APA | Cheng, Lixin , Xia, Guodong . High Heat Flux Cooling Technologies Using Microchannel Evaporators: Fundamentals and Challenges . | HEAT TRANSFER ENGINEERING , 2022 , 44 (16-18) , 1470-1497 . |
| Export to | NoteExpress RIS BibTex |
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
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
自由分子区内纳米颗粒的热泳力计算
Keyword ：
热泳力 热泳力 纳米颗粒 纳米颗粒 自由分子区 自由分子区 分子动力学模拟 分子动力学模拟
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
Export
| Results： |
Selected to |
| Format： |
