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学者姓名：夏国栋
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摘要 ：
As a prominent limiting factor in the performance of microelectronic devices, the improvement of heat dissipation is of utmost importance. The enhancement of heat and mass transfer during boiling by nanostructured surfaces has been demonstrated in many studies. In this study, a nanoscale flow-boiling model is developed by molecular dynamics method in order to deeply investigate the microscopic mechanism of nanostructureenhanced heat transfer. Simple liquid argon is heated by grooved substrate to explore the effect of the depth of the cavities on the boiling heat transfer. The results indicate that the grooved surface improves heat transfer performance through two key mechanisms. Firstly, it induces bubble nucleation, and secondly, it delays the onset of film boiling. The presence of cavities allows the argon atoms within to absorb additional energy from the surrounding walls and be in closer proximity to the heating layer. This reduction in solid thermal resistance results in increased heat transfer efficiency, leading to earlier bubble nucleation and a greater propensity for nucleation within the cavities. The low horizontal velocity of argon atoms within the cavities suggests their ability to retain a significant number of atoms, thereby effectively mitigating the deterioration of heat transfer caused by the formation of a vapor film on the solid wall. The comprehensive performance is observed to improve with increasing depth of the cavities within the range investigated in this study.
关键词 ：
Molecular dynamics methods Molecular dynamics methods Grooved substrate Grooved substrate Bubble nucleation Bubble nucleation Flow boiling Flow boiling
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| GB/T 7714 | Miao, Shanshan , Xia, Guodong . Molecular dynamics investigation of the effect of nanostructured surfaces on flow boiling [J]. | JOURNAL OF MOLECULAR LIQUIDS , 2024 , 400 . |
| MLA | Miao, Shanshan 等. "Molecular dynamics investigation of the effect of nanostructured surfaces on flow boiling" . | JOURNAL OF MOLECULAR LIQUIDS 400 (2024) . |
| APA | Miao, Shanshan , Xia, Guodong . Molecular dynamics investigation of the effect of nanostructured surfaces on flow boiling . | JOURNAL OF MOLECULAR LIQUIDS , 2024 , 400 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Surface wettability has a significant effect on the heat transfer characteristics of the flat plate heat pipe array (FPHPA). In this study, an aluminum based FPHPA measuring 250 x 100 x 3 mm3, comprising of 9 independent channels, was developed to investigate the impact on wettability segmented modification through experiment and simulation. After chemical etching, the micro-nano structure of the surface can produce a hydrophilic effect, while hydrophobic effect can be achieved after spraying polydimethylsiloxane mixture, and the two modification methods passed the heat resistance and durability tests. The FPHPA, equipped with a hydrophilic evaporator, a hydrophobic adiabatic, and a condenser, exhibited enhanced heat transfer characteristics, lower wall temperature, a higher heat transfer limit, and reduced sensitivity to inclination angle. Simulation results revealed that the hydrophilic surface promoted bubbles to break away from the wall surface and improved the critical heat flux of the evaporator, while the hydrophobic surface had a faster droplet return rate and a thinner liquid film thickness, which improved the convective heat transfer coefficient of the condenser. Compared to conventional flat heat pipes, hybrid wetting modified FPHPA shows a higher overall effective thermal conductivity at thermal powers above 90 W. The findings from this study contribute to a better understanding of the heat transfer mechanism following surface modification and offer a practical method for modifying FPHPA.
关键词 ：
Hydrophilic Hydrophilic Flat plate heat pipe array Flat plate heat pipe array Phase change Phase change Heat transfer Heat transfer Hydrophobic Hydrophobic
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| GB/T 7714 | Xue, Qinli , Xia, Guodong , Zhou, Wenbin . Thermal performance of flat plate heat pipe array with surface wettability modification: An experimental and simulation study [J]. | APPLIED THERMAL ENGINEERING , 2024 , 243 . |
| MLA | Xue, Qinli 等. "Thermal performance of flat plate heat pipe array with surface wettability modification: An experimental and simulation study" . | APPLIED THERMAL ENGINEERING 243 (2024) . |
| APA | Xue, Qinli , Xia, Guodong , Zhou, Wenbin . Thermal performance of flat plate heat pipe array with surface wettability modification: An experimental and simulation study . | APPLIED THERMAL ENGINEERING , 2024 , 243 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
To address the significantly increased heat dissipation requirements of 5G base stations, a flat plate heat pipe (FPHP) of 500 x 200 x 3 mm 3 comprising of 19 independent channels was developed. To solve the problem of simulation distortion due to the high superheat of the initial boiling of the working fluid in the ultra -long channel of 490 x 5 x 1.5 mm 3 , this paper adopts the Lee model considering the superheat, and simulates based on the Volume of fluid method, and the simulation results are compared with the experiments, and the average relative error is less than 5 %. The FPHP was explored at 100 - 500 W heat power and filling ratio of 30 %-70 %, depending on the application scenarios of the base station. By partitioning the 19 channels and calculating the thermal resistance of the FPHP based, an Artificial neural network (ANN) model with 10 hidden layer nodes is established based on 675 data sets. The results showed that the mean square error and correlation coefficient were 1.30 x 10 -5 and 0.9990. The ANN prediction results are validated, the mean relative error is 5.4 %, demonstrating that the ANN model can be an effective tool to optimize the FPHP for the telecommunication equipment.
关键词 ：
Artificial neural network Artificial neural network Heat transfer Heat transfer Phase change Phase change Filling ratio Filling ratio Flat plat heat pipe Flat plat heat pipe
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| GB/T 7714 | Xue, Qinli , Xia, Guodong , Li, Ran . Three-dimensional simulation and artificial neural network optimization of a flat plate heat pipe for the cooling of telecommunication equipment [J]. | INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW , 2024 , 107 . |
| MLA | Xue, Qinli 等. "Three-dimensional simulation and artificial neural network optimization of a flat plate heat pipe for the cooling of telecommunication equipment" . | INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW 107 (2024) . |
| APA | Xue, Qinli , Xia, Guodong , Li, Ran . Three-dimensional simulation and artificial neural network optimization of a flat plate heat pipe for the cooling of telecommunication equipment . | INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW , 2024 , 107 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The photovoltaic heat sink integrated systems can effectively control the temperature of solar cells and increase output power. The linear Fresnel concentrator photovoltaic heat sink integrated systems (LFC-PV systems) consists of a solar cell, a porous-wall mini-channel heat sink (MFP-channel) and a linear Fresnel concentrator (LFC) mirror array. Cooling fluid R141b absorbs heat from solar cell back by flow boiling heat transfer. In this work, we tested the system performance outdoors and the collected experimental data were used for energy analysis, exergy analysis and environmental analysis to evaluate the advantages and disadvantages of the integrated system. The experimental data show that the heat dissipation of solar cells by using a porous-wall minichannel heat sink can not only well control the surface temperature of solar cells between 35 degrees C and 40 degrees C, but also increase the output power and exergy, where the output power can reach a maximum of 10.73 W. Therefore, it is recommended to use a porous-wall mini-channel heat sink for the thermal management of the LFC photovoltaic system.
关键词 ：
Photovoltaic cooling Photovoltaic cooling Metal foam Metal foam Linear fresnel Linear fresnel Mini -channel Mini -channel
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| GB/T 7714 | Wang, Yacheng , Xia, Guodong , Zhou, Wenbin et al. Exergetic and environment assessment of linear fresnel concentrating photovoltaic systems integrated with a porous-wall mini-channel heat sink: Outdoor experimental tests [J]. | ENERGY , 2024 , 306 . |
| MLA | Wang, Yacheng et al. "Exergetic and environment assessment of linear fresnel concentrating photovoltaic systems integrated with a porous-wall mini-channel heat sink: Outdoor experimental tests" . | ENERGY 306 (2024) . |
| APA | Wang, Yacheng , Xia, Guodong , Zhou, Wenbin , Zhao, Shuai , Zhao, Pengsheng . Exergetic and environment assessment of linear fresnel concentrating photovoltaic systems integrated with a porous-wall mini-channel heat sink: Outdoor experimental tests . | ENERGY , 2024 , 306 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Due to the urgent need for heat dissipation of high heat flux devices in many engineering applications to maintain high performance and stable operation, flow boiling in micro/mini-channel heat sinks is an enabling and promising approach to tackling high heat flux cooling issues in emerging cutting-edge technology. Various enhancement techniques for flow boiling in micro/mini-channels have been investigated in recent years. These mainly include various surface modifications, enhanced channel structures and composite enhancement techniques. These techniques are able to improve flow boiling heat transfer coefficient (HTC), critical heat transfer (CHF) and mitigate two phase flow instabilities. The composite enhancement techniques take the advantage of each individual technique for flow boiling to achieve more efficient heat transfer and stable flow. However, there are challenges to optimizing these techniques and understanding the very complex mechanisms involved in these emerging techniques. This paper presents a comprehensive review of the studies of various enhancement techniques for flow boiling and mechanisms in micro/mini-channels having hydraulic diameter of 0.1-3 mm over the past five years. First, the criteria for distinction of micro/mini-channels and classification of flow boiling enhancement techniques are discussed. Then, studies of flow boiling enhancement techniques using surface modification techniques and enhanced structures are critically reviewed. Next, the effects of surface modification techniques and enhanced structures on flow boiling heat transfer, CHF, two phase flow patterns, two phase flow instability and mechanisms in micro/mini-channels are discussed and analyzed. Other enhancement techniques such as using surfactants to enhance flow boiling is also mentioned. Finally, future research needs have been identified and recommended according to the comprehensive review and deep analysis. Systematic research on the physical mechanisms underlying the composite heat transfer enhancement techniques is urgently needed. Optimization design of micro/mini-channel flow boiling heat transfer enhancement techniques is a big challenge and should be focused on in future. In order to understand the mechanisms, the bubble dynamics, bubble nucleation and flow patterns of flow boiling in the composite enhancement techniques in micro/mini-channels should be systematically investigated to understand the mechanisms and optimizing the enhancement techniques. Effort should be made to develop prediction methods for flow boiling heat transfer and CHF in the long run.
关键词 ：
Enhanced structure technique Enhanced structure technique Flow boiling Flow boiling Surface modification technique Surface modification technique Microchannel Microchannel Minichannel Minichannel Composite enhancement technique Composite enhancement technique
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| GB/T 7714 | Shang, Huiqing , Xia, Guodong , Cheng, Lixin et al. Comprehensive review of enhancement techniques and mechanisms for flow boiling in micro/mini-channels [J]. | APPLIED THERMAL ENGINEERING , 2024 , 258 . |
| MLA | Shang, Huiqing et al. "Comprehensive review of enhancement techniques and mechanisms for flow boiling in micro/mini-channels" . | APPLIED THERMAL ENGINEERING 258 (2024) . |
| APA | Shang, Huiqing , Xia, Guodong , Cheng, Lixin , Miao, Shanshan . Comprehensive review of enhancement techniques and mechanisms for flow boiling in micro/mini-channels . | APPLIED THERMAL ENGINEERING , 2024 , 258 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Micro/mini-channel heat sinks are extensively utilized in heat dissipation systems that involve high heat flux components. These heat sinks are preferred due to their compact size and excellent heat transfer efficiency. The selection of a refrigerant condensation system for the heat dissipation system under vapor conditions is crucial. In order to investigate the heat transfer characteristics of flow condensation in a mini-channel, a visual experiment system was used with a hydraulic diameter of 2 mm and a volume flowrate of 30 mL/min, 60 mL/min, 90 mL/ min, 120 mL/min respectively. The study focused on the effect of inlet vapor quality on the flow pattern and heat transfer characteristics of flow condensation in the mini-channel. The results indicate that the flow pattern in flow condensation process can be classified into annular flow, transition flow, slug flow and bubble flow in sequence along the flow direction. As the inlet vapor quality (xin) increases, the dominance of annular flow gradually increases, making it difficult to capture the bubble flow with high volume flowrate and high inlet vapor quality. This phenomenon is observed under experimental conditions when: 1) xin is equal to or greater than 0.75 at a volume flowrate of 60 mL/min, 2) xin is equal to or greater than 0.55 at a volume flowrate of 90 mL/min, and 3) xin is equal to or greater than 0.25 at a volume flowrate of 120 mL/min. The increase in inlet vapor quality is beneficial to the improvement of condensation heat transfer coefficient. In this experiment, it was observed that the local heat transfer coefficient was decreased by up to 83.7 % when comparing the lowest vapor quality to the highest at the same volume flowrate, emphasizing the significance of inlet vapor quality in the flow condensation during the heat transfer process.
关键词 ：
Condensation Condensation Flow pattern Flow pattern Heat transfer Heat transfer Vapor quality Vapor quality Mini-channel Mini-channel
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| GB/T 7714 | Shang, Huiqing , Yan, Ziheng , Xia, Guodong . Analysis of influence of inlet vapor quality on heat transfer and flow pattern in mini-channels during flow condensation process [J]. | APPLIED THERMAL ENGINEERING , 2023 , 236 . |
| MLA | Shang, Huiqing et al. "Analysis of influence of inlet vapor quality on heat transfer and flow pattern in mini-channels during flow condensation process" . | APPLIED THERMAL ENGINEERING 236 (2023) . |
| APA | Shang, Huiqing , Yan, Ziheng , Xia, Guodong . Analysis of influence of inlet vapor quality on heat transfer and flow pattern in mini-channels during flow condensation process . | APPLIED THERMAL ENGINEERING , 2023 , 236 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Manifold microchannel heat sinks (MMCHSs) are essential in thermal management. Conventional Z-type MMCHS encounter flow maldistribution and large temperature gradients on the heating surface. This work proposes an innovative MMCHS with restrictors to reduce flow maldistribution and compared with other optimization schemes. Through the numerical simulation, we optimize three dimensionless parameters (the width ratio alpha and length ratio beta of the restrictor and inlet-to-outlet width ratio of manifold gamma). Introducing the restrictor into the MMCHS can reduce flow maldistribution. In the research scope, the maximum mass flux discrepancy of MMCHS with alpha = 0.3 decreased from 327.17% to 64.51% compared to MMCHS with alpha = 1 when the volumetric flow rate is 8.51 mL/min. The reason is that restrictors increase the ratio between pressure drop in microchannels and total pressure drop(Delta pc/Delta p). Additionally, the coupling effect of the restrictor and gamma on thermal-hydraulic in MMCHS are complicated. Therefore, the thermal resistance ratio (Rt/Rt,0), the pumping power ratio (Pp/Pp,0) and performance evaluation criteria (PEC) are taken as references to consider the thermal-hydraulic performance of MMCHS comprehensively. The results display that the MMCHS with alpha = 0.5- 0.6, beta = 0.4 and gamma = 0.8- 1 can further control the synchronization of Rt/Rt,0 and Pp/Pp,0 at about 0.75. The PEC values are all greater than 1.59.
关键词 ：
Restrictor Restrictor Temperature gradient Temperature gradient Manifold microchannel heat sink Manifold microchannel heat sink Flow maldistribution Flow maldistribution Numerical calculation Numerical calculation
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| GB/T 7714 | Wang, Shenshen , Xia, Guodong , Ma, Dandan et al. Influence of restrictor on the thermal-hydraulic performance in manifold microchannel heat sink [J]. | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2023 , 149 . |
| MLA | Wang, Shenshen et al. "Influence of restrictor on the thermal-hydraulic performance in manifold microchannel heat sink" . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER 149 (2023) . |
| APA | Wang, Shenshen , Xia, Guodong , Ma, Dandan , Li, Ran , Xu, Lei . Influence of restrictor on the thermal-hydraulic performance in manifold microchannel heat sink . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2023 , 149 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
To meet the increased heat dissipation demands of 5G base stations, a flat plate heat pipe array (FPHPA) of 500 x 200 x 3 mm3 comprising of 19 independent channels is developed. To investigate the thermal performance of the FPHPA under different filling ratios (FR) and heat powers (30-300 W), a multi-channel independent filling system is designed to conduct two experimental cases: uniform or asymmetric filling of all channels. Results indicate that 30 %-70 % FR exhibits better thermal performance and can replace the aluminum plate over a broader heat power range. Furthermore, separate tests are conducted to evaluate the heat transfer and start-up performance of the FPHPA. The optimal filling ratio interval of single channel at different heat fluxes is derived through asymmetric filling. Subsequently, a mixture model is proposed and compared with the uniform filling ratio case, resulting in optimized heat transfer performance. The optimized FPHPA provides better heat transfer performance, effectively reducing the area averaged wall temperature and ensuring the normal operation of the 5G base station.
关键词 ：
Flat plate heat pipe array Flat plate heat pipe array Filling ratio Filling ratio Experiment Experiment Asymmetric filling Asymmetric filling Single channel Single channel
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| GB/T 7714 | Xue, Qinli , Xia, Guodong , Zhou, Wenbin . Experimental investigation on the optimization of different filling ratios for large-size flat plate heat pipe array [J]. | APPLIED THERMAL ENGINEERING , 2023 , 236 . |
| MLA | Xue, Qinli et al. "Experimental investigation on the optimization of different filling ratios for large-size flat plate heat pipe array" . | APPLIED THERMAL ENGINEERING 236 (2023) . |
| APA | Xue, Qinli , Xia, Guodong , Zhou, Wenbin . Experimental investigation on the optimization of different filling ratios for large-size flat plate heat pipe array . | APPLIED THERMAL ENGINEERING , 2023 , 236 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
This paper mainly presents comprehensive review on the research regarding adiabatic and diabatic gas-liquid two-phase flow patterns, bubble growth, flow pattern transitions and flow pattern maps in microchannels over the past 15 years. First, criteria for distinction of macro- and micro-channels are discussed. Then, fundamentals of gas liquid two-phase flow patterns, flow pattern maps and techniques for two phase flow visualization and sensing are presented. Next, experimental studied of adiabatic and diabatic two phase flow patterns, bubble behaviour, flow pattern transitions and flow pattern maps in microchannels with plain and enhanced structures are reviewed. Finally, applications of flow patterns and flow pattern maps are discussed. Flow pattern based mechanistic heat transfer prediction methods are focused on and studies on unstable and transient two phase flow patterns and heat transfer in microscale channels are addressed. According to the review and analysis, recommendations on the future research needs have been given. Systematic and accurate experimental data on flow patterns, bubble growth, flow pattern transitions are still needed. In particular, there are lacks general flow pattern transition criteria. Therefore, effort should be made to develop generalized flow pattern transition criteria based on well documented experimental observation and data. Furthermore, studies of mechanistic and theoretical models for flow patterns, flow pattern transitions bubble growth in microchannels should be further conducted. As an important topic, unstable and transient gas liquid two phase flow patterns and heat transfer in microchannels should be systematically investigated as well in order to understand the flow pattern transition mechanisms in microchannels with plain and enhanced structures.
关键词 ：
Flow pattern maps Flow pattern maps Unstable and transient flow patterns Unstable and transient flow patterns Mechanism Mechanism Microchannels Microchannels Flow patterns Flow patterns Bubble dynamics Bubble dynamics
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| GB/T 7714 | Cheng, Lixin , Xia, Guodong . Flow patterns and flow pattern maps for adiabatic and diabatic gas liquid two phase flow in microchannels: fundamentals, mechanisms and applications [J]. | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2023 , 148 . |
| MLA | Cheng, Lixin et al. "Flow patterns and flow pattern maps for adiabatic and diabatic gas liquid two phase flow in microchannels: fundamentals, mechanisms and applications" . | EXPERIMENTAL THERMAL AND FLUID SCIENCE 148 (2023) . |
| APA | Cheng, Lixin , Xia, Guodong . Flow patterns and flow pattern maps for adiabatic and diabatic gas liquid two phase flow in microchannels: fundamentals, mechanisms and applications . | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2023 , 148 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Liquid evaporation from micro/nanoscale pores is widely encountered in cutting-edge technologies and applications. Due to its two- or three-dimensional features, the nano-porous evaporation is less understood compared to the one-dimensional evaporation of a planar liquid surface. This paper reported a novel study of the inter-pore interference effect in nano-porous evaporation, clarifying the variation in the net evaporation rate from individual nanopores when the inter-pore distance, neighboring nanopore diameter, or liquid temperature were changed. Molecular simulation results showed that the reduction in inter-pore distance could enhance the evaporation rate from nanopores by augmenting the vapor convection effect and suppressing the condensation flux. This interference effect was more pronounced at lower evaporation intensity with the evaporation flux being different by up to 25% from the one-dimensional case. The inter-pore interference was equally observed for Knudsen numbers of 0.1 and 10. Additionally, the non-uniformity in nanopore size distribution had no influence on the evaporative mass flux within the present parameter range. The non-uniformity in nanopore temperatures, however, could affect the net evaporation from individual nanopores, similarly by modulating the vapor convection magnitude in adjacent to the interface and the condensation flux. The effect of inter-pore interference is found to be essential at low evaporation intensity, which is highly relevant in industrial applications such as water evaporation under atmospheric pressure.
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| GB/T 7714 | Li, Ran , Yan, Ziqing , Xia, Guodong . Effect of inter-pore interference on liquid evaporation rates from nanopores by direct simulation Monte Carlo [J]. | PHYSICS OF FLUIDS , 2023 , 35 (3) . |
| MLA | Li, Ran et al. "Effect of inter-pore interference on liquid evaporation rates from nanopores by direct simulation Monte Carlo" . | PHYSICS OF FLUIDS 35 . 3 (2023) . |
| APA | Li, Ran , Yan, Ziqing , Xia, Guodong . Effect of inter-pore interference on liquid evaporation rates from nanopores by direct simulation Monte Carlo . | PHYSICS OF FLUIDS , 2023 , 35 (3) . |
| 导入链接 | NoteExpress RIS BibTex |
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