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学者姓名：夏国栋
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Abstract ：
Micro/mini-channel heat sinks play a crucial role in the heat dissipation of electronic components, such as server chips. In this study, the minichannel heat sinks were designed by 6061-aluminum alloy to investigate their heat dissipation capabilities. Flow boiling experiments with low flow velocities in minichannels were conducted in the smooth parallel minichannel (SPMC) and porous parallel minichannel (PPMC) heat sinks at conditions of high power and low heat flux. The mass fluxes varied from 121.0 to 241.9 kg/(m2s), and the effective heat fluxes varied from 0 to 9.1 W/cm2. The effects of mass flux, heat flux, inlet temperature, and surface structure on heat transfer and flow pattern transition during flow boiling of HFE-7100 were discussed. The research indicates that at the room-temperature condition, the maximum decrease in wall temperature is 2.39 % between them under a mass flux is 181.4 kg/(m2s) and a heat flux is about 7 W/cm2. The wall temperature can be maintained below 75 degrees C, while the pressure drop is consistently below 0.6 kPa at all conditions. With the increase in effective heat fluxes, the boundary of flow pattern transition becomes less distinct, slug flow and churn flow are the main flow patterns in the mid/downstream of minichannels.
Keyword ：
Flow boiling Flow boiling Flow pattern Flow pattern Chip cooling Chip cooling Heat transfer Heat transfer Minichannel Minichannel
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| GB/T 7714 | Shang, Huiqing , Xia, Guodong , Li, Ran et al. Experimental study on flow boiling heat transfer of HFE-7100 in minichannel heat sinks for professional-grade server chips cooling [J]. | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2025 , 164 . |
| MLA | Shang, Huiqing et al. "Experimental study on flow boiling heat transfer of HFE-7100 in minichannel heat sinks for professional-grade server chips cooling" . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER 164 (2025) . |
| APA | Shang, Huiqing , Xia, Guodong , Li, Ran , Miao, Shanshan . Experimental study on flow boiling heat transfer of HFE-7100 in minichannel heat sinks for professional-grade server chips cooling . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2025 , 164 . |
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Abstract ：
Improving chip integration and computing power leads to serious local overheating and high energy consumption in data centers. An innovative heat sink with offset triangular grooves is introduced to solve heat dissipation issue and improve energy efficiency of the cooling system. The flow boiling properties in the new configuration are examined by visualization experiment for a flow rate of 3 similar to 15 ml/min and heat flux of 4.58 similar to 100.66 W/cm(2). The influence of groove arrangement on the flow evolution, boiling curve, heat transfer rate, pump power, coefficient of performance, and temperature features is explored in detail. The new findings include that: compared to the rectangular microchannel, the offset grooves induce boiling with a 16.8 degrees C lower temperature and 10.52 times higher heat transport efficiency, attributing to the increased nucleation sites and enhanced liquid film vaporization. For low heat flux, the heat transport rate of offset grooves is 2.87 times larger than the symmetrical one because of the efficient steam removal. For high heat flux, the symmetrical grooves present superior thermal performance due to stronger flow disturbance. Moreover, the pump power for the offset grooves is dropped by 71.47 % and 14.23 % compared to the smooth one and symmetrical counterpart, respectively. The temperature stability and uniformity of the offset grooves are also better than those of other heat sinks. The effect of groove arrangement on the flow boiling features is revealed thoroughly, and the optimal configuration under different operating conditions is obtained. The innovative configuration achieves heat dissipation enhancement while reducing pump power with a significantly improved coefficient of performance. In addition, the interaction between flow evolution and heat transfer is elucidated by bubble dynamics analysis. The new design has a better application prospect for chip-scale cooling in data centers because of the improved boiling stability, increased heat transport efficiency, reduced pump power, and favorable temperature performance.
Keyword ：
Microchannel heat sink Microchannel heat sink Offset groove Offset groove Two-phase flow Two-phase flow Temperature characteristic Temperature characteristic Heat transport Heat transport
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| GB/T 7714 | Li, Yifan , Zhu, Congzhe , Xia, Guodong et al. Experimental investigation on the phase change liquid cooling characteristics in the offset grooved microchannel heat sink [J]. | APPLIED THERMAL ENGINEERING , 2025 , 269 . |
| MLA | Li, Yifan et al. "Experimental investigation on the phase change liquid cooling characteristics in the offset grooved microchannel heat sink" . | APPLIED THERMAL ENGINEERING 269 (2025) . |
| APA | Li, Yifan , Zhu, Congzhe , Xia, Guodong , Yang, Bin . Experimental investigation on the phase change liquid cooling characteristics in the offset grooved microchannel heat sink . | APPLIED THERMAL ENGINEERING , 2025 , 269 . |
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Abstract ：
Evaporation from nanoporous membranes is an emerging and efficient thermal management strategy for microelectronic devices, and its mechanism has been extensively studied. It has been found that there are many factors that affect the evaporation rate, such as porosity and meniscus. In this paper, the equivalent evaporation coefficient is introduced to account for all these factors to transform the nanopore evaporation into one-dimensional plane evaporation so that the evaporation flux from any nanopore configuration can be simply solved. Theoretical analysis and modeling are performed, and direct simulation Monte Carlo (DSMC) method is used to verify the reliability of the model. The proposed equivalent evaporation coefficient incorporates the meniscus shape, nanopore transmissivity, nanopore porosity, and the intrinsic evaporation coefficient with solid physical sounds. The overall accuracy of our model is excellent, with 94.5% of simulated data being predicted within 5%. The physical meaning of the equivalent evaporation coefficient presented in this paper is clear and comprehensive, which significantly facilitates engineering application.
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| GB/T 7714 | Zhao, Pengsheng , Xia, Guodong , Li, Ran . Nanopore evaporation prediction model with a complete explanation of the equivalent evaporation coefficient [J]. | PHYSICS OF FLUIDS , 2025 , 37 (1) . |
| MLA | Zhao, Pengsheng et al. "Nanopore evaporation prediction model with a complete explanation of the equivalent evaporation coefficient" . | PHYSICS OF FLUIDS 37 . 1 (2025) . |
| APA | Zhao, Pengsheng , Xia, Guodong , Li, Ran . Nanopore evaporation prediction model with a complete explanation of the equivalent evaporation coefficient . | PHYSICS OF FLUIDS , 2025 , 37 (1) . |
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Abstract ：
Miniaturization and integration in electronic devices have caused a rapid increase in heat flux. Dissipation of high heat flux from devices for uniform temperature is essentially required to ensure device safety. Therefore, a variable-period sinusoidal microchannel heat sink is proposed to enhance heat transfer and improve the uniformity of temperature distribution. Experimental and numerical simulation methods are adopted to investigate the single-phase heat transfer performance of deionized water under different heat fluxes and flow rates. The temperature, Nusselt number, pressure drop, thermal resistance, pumping power, and temperature and flow field distribution of the variable-period sinusoidal microchannel heat sink are obtained and compared with those of a traditional sinusoidal microchannel heat sink. Results show that the variable-period sinusoidal microchannel improves fluid disturbance and heat transfer area to enhance heat transfer but increases flow resistance. The maximum temperature difference is reduced by 2.3-3.5 K, and the Nusselt number is improved by 13.1 %-7.8 %, albeit with increasing pressure drop by about 7.5 kPa. The uniformity of temperature distribution is improved by 8.5 %-32.9 %. Under the same pumping power, the average reduction in thermal resistance is about 13 %. And under the same thermal resistance, the average reduction in pumping power is about 70. These results demonstrate that the variable-period sinusoidal microchannel can improve the overall thermohydraulic performance of the heat sink.
Keyword ：
Temperature distribution Temperature distribution Thermohydraulic performance Thermohydraulic performance Sinusoidal microchannel heat sink Sinusoidal microchannel heat sink Enhance heat transfer Enhance heat transfer Variable period Variable period
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| GB/T 7714 | Ma, Dandan , Liu, Yushan , Zhang, Xiaomeng et al. Experimental and numerical investigation of the thermohydraulic performance of a variable-period sinusoidal microchannel heat sink [J]. | APPLIED THERMAL ENGINEERING , 2025 , 262 . |
| MLA | Ma, Dandan et al. "Experimental and numerical investigation of the thermohydraulic performance of a variable-period sinusoidal microchannel heat sink" . | APPLIED THERMAL ENGINEERING 262 (2025) . |
| APA | Ma, Dandan , Liu, Yushan , Zhang, Xiaomeng , Xia, Guodong . Experimental and numerical investigation of the thermohydraulic performance of a variable-period sinusoidal microchannel heat sink . | APPLIED THERMAL ENGINEERING , 2025 , 262 . |
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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 et al. "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 ：
The flow and heat transfer processes of liquid argon within nanochannels with random roughness are investigated using the molecular dynamics method. This study explores the effects of surface roughness and wettability on flow and heat transfer performance. The results indicate that both surface roughness and wettability significantly influence temperature jumps, velocity slip, flow resistance, and temperature distribution. Specifically, hydrophilic surfaces can reduce temperature jumps and velocity slip due to their enhanced ability to adsorb liquid atoms, which effectively improves heat transfer while simultaneously increasing flow resistance. The fractal dimension D characterizes the surface roughness, which decreases as D increases. Additionally, both the Nusselt number and drag coefficient decrease with increasing D. In this study, we investigate cases where D ranges from 2.5 to 2.9, with D = 2.5 representing the highest roughness, and the smooth channel corresponding to the lowest roughness. For hydrophilic nanochannels at D = 2.5, the Nusselt number and drag coefficient increased by factor of 2.2 times and 5.2 times compared to smooth channels, respectively. For hydrophobic nanochannels at D = 2.5, the Nusselt number and drag coefficient increased by a factor of 4.5 times and 29.1 times compared to smooth surface channels, respectively. Considering both flow and heat transfer performances, the best comprehensive performance is achieved with D = 2.8 for channels with hydrophilic surfaces and D = 2.6 for channels with hydrophobic surfaces. This work systematically investigates the coupled effects of random roughness and wettability on the flow and heat transfer characteristics in nanochannels, providing new theoretical insights for optimizing nanochannel design.
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| GB/T 7714 | Miao, Shanshan , Xia, Guodong , Zhou, Wenbin et al. Effect of wettability and surface roughness on flow and heat transfer characteristics in nanochannels [J]. | PHYSICS OF FLUIDS , 2024 , 36 (10) . |
| MLA | Miao, Shanshan et al. "Effect of wettability and surface roughness on flow and heat transfer characteristics in nanochannels" . | PHYSICS OF FLUIDS 36 . 10 (2024) . |
| APA | Miao, Shanshan , Xia, Guodong , Zhou, Wenbin , Shang, Huiqing . Effect of wettability and surface roughness on flow and heat transfer characteristics in nanochannels . | PHYSICS OF FLUIDS , 2024 , 36 (10) . |
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Abstract ：
Reinforcement of heat transfer efficiency by electrohydrodynamics is a low-energy, high-efficiency technology. In this paper, we utilize the property of electrohydrodynamics to enhance heat transfer within a linear Fresnel concentrator photovoltaic (PV) system, with the anticipation of boosting the overall performance of the PV system in the process. The cooling fluid used in this work is R141b/R245fa mixture. In this paper, the output voltage, output current and inlet and outlet temperatures of the cooling fluid are tested in an outdoor environment. This paper analyzes the output power, system energy and environmental impact of a linear Fresnel PV system. The results show that the output power of the linear Fresnel PV system under the action of electric field (Applied voltage = 200 V) can reach a maximum of 11.45W and the surface average temperature of the solar cell can be maintained between 31 degrees C and 34 degrees C. When the applied voltage is 0 V, the average surface temperature of the solar cell fluctuates between 30 degrees C and 50 degrees C. Through the aforementioned study, it has been observed that the incorporation of the electric field effect can facilitate stable and efficient operation of the linear Fresnel photovoltaic system.
Keyword ：
Photovoltaic cooling Photovoltaic cooling Mini-channel heat sink Mini-channel heat sink Electrohydrodynamics Electrohydrodynamics Linear Fresnel Linear Fresnel
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| GB/T 7714 | Wang, Yacheng , Xia, Guodong , Zhou, Wenbin et al. Performance investigation of linear Fresnel concentrating photovoltaic systems with mini-channel heat sink using R141b/R245fa mixture enhanced by electric field [J]. | RENEWABLE ENERGY , 2024 , 238 . |
| MLA | Wang, Yacheng et al. "Performance investigation of linear Fresnel concentrating photovoltaic systems with mini-channel heat sink using R141b/R245fa mixture enhanced by electric field" . | RENEWABLE ENERGY 238 (2024) . |
| APA | Wang, Yacheng , Xia, Guodong , Zhou, Wenbin , An, Ce . Performance investigation of linear Fresnel concentrating photovoltaic systems with mini-channel heat sink using R141b/R245fa mixture enhanced by electric field . | RENEWABLE ENERGY , 2024 , 238 . |
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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 et al. "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 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 ：
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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