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< Page ,Total 74 >
Numerical study on temperature rise and mechanical properties of winding in oil-immersed transformer EI
期刊论文 | 2022 , 239 | Energy
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Abstract :

In the present paper, the electromagnetic-fluid-thermal-mechanical stress coupling process in an oil-immersed transformer is numerical studied with finite element method. The relationship between electromagnetic force and flux leakage, interaction of losses, temperature and oil flow, and the influence of electromagnetic force and temperature rise on mechanical characteristics of coil are carefully analyzed. Firstly, the leakage flux is mainly generated at the ends of coil and core corner end. The electromagnetic force of B-Phase low voltage coil is the highest due to the leakage flux superimposition caused by A-Phase and C-Phase coils and higher current on B-Phase low voltage coil itself. Secondly, the interaction between losses, temperature and oil flow is remarkable. Compared with the results as heat source is constant, the loss density of high and low voltage coil increased by 18.18% and 14.87%, respectively, and the hot spot temperature increased by 7.06 K. Finally, it is revealed that the coil deformation is mainly caused by thermal load, and little affected by electromagnetic force. The frequency of stress is twice as high as that of energized current. The stress at both ends of the coil is the highest and it would lead to fatigue failures. © 2021 Elsevier Ltd

Keyword :

Oil filled transformers Transformer windings Stresses Numerical methods Deformation Winding

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GB/T 7714 Jia, Xiaoyu , Lin, Mei , Su, Shiwei et al. Numerical study on temperature rise and mechanical properties of winding in oil-immersed transformer [J]. | Energy , 2022 , 239 .
MLA Jia, Xiaoyu et al. "Numerical study on temperature rise and mechanical properties of winding in oil-immersed transformer" . | Energy 239 (2022) .
APA Jia, Xiaoyu , Lin, Mei , Su, Shiwei , Wang, Qiuwang , Yang, Jian . Numerical study on temperature rise and mechanical properties of winding in oil-immersed transformer . | Energy , 2022 , 239 .
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Study on mechanical stress of semicircular and rectangular channels in printed circuit heat exchangers EI
期刊论文 | 2022 , 238 | Energy
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Abstract :

Recuperator and precooler are key components of supercritical CO2 Brayton cycle. One of promising candidates is printed circuit heat exchanger (PCHE) due to its high compactness and heat transfer performance. However, both of them operate at high pressure, which is a great challenge for their safety. Therefore, accurate and quick mechanical stress analysis is important for PCHE design. In this work, a simplified mechanical stress method based on homogenization method is proposed for PCHE. An optimized rectangular channel, which has the same mechanical characteristics with a semicircular channel is proposed. Then the PCHE numerical model is constructed, and the mechanical stress of PCHEs with semicircular and rectangular channels is examined by elastic stress analysis. The results show that the maximum stresses of the semicircular channel, simplified rectangular channel and optimized rectangular channel are 151.6 MPa, 253.0 MPa and 184.3 MPa, respectively. The mechanical characteristics of the optimized rectangular channel are close to the corresponding semicircular channel, which can improve the design accuracy and is benefit for the weight and volume reduction of PCHE. © 2021 Elsevier Ltd

Keyword :

Electric network analysis Stress analysis Timing circuits Nuclear reactors Homogenization method Heat exchangers Printed circuits Brayton cycle Heat transfer performance

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GB/T 7714 Xu, Zirui , Chen, Wangnan , Lian, Jie et al. Study on mechanical stress of semicircular and rectangular channels in printed circuit heat exchangers [J]. | Energy , 2022 , 238 .
MLA Xu, Zirui et al. "Study on mechanical stress of semicircular and rectangular channels in printed circuit heat exchangers" . | Energy 238 (2022) .
APA Xu, Zirui , Chen, Wangnan , Lian, Jie , Yang, Xiongwei , Wang, Qiuwang , Chen, Yitung et al. Study on mechanical stress of semicircular and rectangular channels in printed circuit heat exchangers . | Energy , 2022 , 238 .
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Recent advancement and enhanced battery performance using phase change materials based hybrid battery thermal management for electric vehicles EI
期刊论文 | 2022 , 154 | Renewable and Sustainable Energy Reviews
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Abstract :

The transition from gasoline automobiles to electric vehicles (EVs) is promoted as an alternative to reduce greenhouse gas (GHG) and pollutant emissions. The performance of EVs depends entirely on the performance of a power battery, especially the lithium-ion (Li-ion) battery, which is very sensitive to temperature. The temperature of Li-ion battery must be controlled and maintained within a desired range. This paper provides two aspects: (i) a review on research progress in battery thermal management (BTM) with emphasis on battery technology of commercial EVs and phase change material (PCM) based hybrid thermal management and (ii) a developed passive thermal management for prismatic Li-ion battery module under abuse operation condition. The hybrid thermal management combining PCM based with air/liquid/heat pipes can provide superior thermal performance than any active or passive alone. Improving the existing battery thermal management system along with exploring novel techniques to regulate thermal impact and power consumption are required. For the developed battery module, thermal performance based on finite element method is analyzed in a situation where the PCM content surrounding the batteries is reduced due to leakage or toppled over of PCM during melting process. Two different configurations are considered. The open medium configuration exhibited better performance in decreasing the maximum temperature by 1.172 °C, 1.396 °C, 1.628 °C, and 1.860 °C in the module at various PCM shrink levels of 2, 4, 6, and 8 mm, respectively. © 2021 Elsevier Ltd

Keyword :

Greenhouse gases Vehicle performance Hybrid materials Gas emissions Temperature control Phase change materials Ions Lithium-ion batteries Thermal management (electronics)

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GB/T 7714 Mohammed, Abubakar Gambo , Elfeky, Karem Elsayed , Wang, Qiuwang . Recent advancement and enhanced battery performance using phase change materials based hybrid battery thermal management for electric vehicles [J]. | Renewable and Sustainable Energy Reviews , 2022 , 154 .
MLA Mohammed, Abubakar Gambo et al. "Recent advancement and enhanced battery performance using phase change materials based hybrid battery thermal management for electric vehicles" . | Renewable and Sustainable Energy Reviews 154 (2022) .
APA Mohammed, Abubakar Gambo , Elfeky, Karem Elsayed , Wang, Qiuwang . Recent advancement and enhanced battery performance using phase change materials based hybrid battery thermal management for electric vehicles . | Renewable and Sustainable Energy Reviews , 2022 , 154 .
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Effect of rib diameter on flow boiling heat transfer with staggered rib arrays in a heat sink EI
期刊论文 | 2022 , 239 | Energy
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With the integration development of electronic equipment, a more compact and higher efficiency heat dissipation system is required to meet its cooling demands. In this work, the design of ribbed channel heat sink in a limited volume to maximize its heat transfer capacity is analyzed. Two-phase flow boiling performance of rib diameters ranging from D = 1–10 mm is characterized using the Mixture multiphase model. The working fluid is coolant Novec649 and its mass flux is 1527 kg m−2 s−1. The heat fluxes imposed on the channel wall range from 50 to 300 kW m−2. The results show that the average heat transfer coefficient increases and the wall temperature decreases with the increase of the rib diameter, respectively. The heat transfer performance factor increases with the decrease of heat fluxes, and first decreases with the increase of the rib diameters, then keeps constant. The comprehensive heat transfer performance factor is defined by temperature uniformity. It appears two maximum values which are located at D = 5 and 10 mm, one minimum value at D = 7.14 mm. The best comprehensive heat transfer performance of the heat sink is at D = 10 mm. © 2021 Elsevier Ltd

Keyword :

Two phase flow Heat sinks Heat transfer coefficients Heat flux Electronic cooling Oscillators (electronic)

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GB/T 7714 Qi, Di , He, Jing , Xu, Yongsheng et al. Effect of rib diameter on flow boiling heat transfer with staggered rib arrays in a heat sink [J]. | Energy , 2022 , 239 .
MLA Qi, Di et al. "Effect of rib diameter on flow boiling heat transfer with staggered rib arrays in a heat sink" . | Energy 239 (2022) .
APA Qi, Di , He, Jing , Xu, Yongsheng , Lin, Mei , Wang, Qiuwang . Effect of rib diameter on flow boiling heat transfer with staggered rib arrays in a heat sink . | Energy , 2022 , 239 .
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An extended Teorell-Meyer-Sievers theory for membrane potential under non-isothermal conditions EI
期刊论文 | 2022 , 643 | Journal of Membrane Science
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Abstract :

Membrane potential is one of the key performance parameters in reverse-electrodialysis based salinity gradient driven power generation. The Teorell-Meyer-Sievers (TMS) theory is widely used to describe the membrane potential under isothermal conditions. Here, we formulate an extended TMS theory that can be applicable to cases in which both salinity and temperature gradients are existent. The new theory shows a good quantitative agreement with the experimental data for purely salinity or temperature gradient induced membrane potential in the current literature. The activity coefficient correction, the temperature polarization (TP), the solute diffusion speed ratio between membrane and solution phases together with the unequal electrolyte heats of transport in membrane and solution phases can account for the experimental observations. Results also suggest that the membrane potential can be enhanced when the salinity gradient and the temperature gradient are in opposite directions, and can be enhanced or reduced when the directions of the two gradients are the same, depending on the extent of the TP effect. The enhancement can reach 43.7% for a temperature difference of 60 K when the gradients of salinity and temperature are in the opposite directions. The membrane potential can be enhanced by reducing the TP effect and increasing the membrane charge. © 2021 Elsevier B.V.

Keyword :

Polarization Thermal gradients Isotherms Membranes Electrolytes Electrodialysis

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GB/T 7714 Zhang, Wenyao , Yan, Huilong , Wang, Qiuwang et al. An extended Teorell-Meyer-Sievers theory for membrane potential under non-isothermal conditions [J]. | Journal of Membrane Science , 2022 , 643 .
MLA Zhang, Wenyao et al. "An extended Teorell-Meyer-Sievers theory for membrane potential under non-isothermal conditions" . | Journal of Membrane Science 643 (2022) .
APA Zhang, Wenyao , Yan, Huilong , Wang, Qiuwang , Zhao, Cunlu . An extended Teorell-Meyer-Sievers theory for membrane potential under non-isothermal conditions . | Journal of Membrane Science , 2022 , 643 .
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Numerical Study on Heat Transfer Characteristic of Granular Flow Around Different Fin Elements EI
期刊论文 | 2021 , 42 (4) , 1015-1020 | Journal of Engineering Thermophysics
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Abstract :

Due to the low cost and the stable operation condition, the gravity-driven moving bed has great application potentials in the waste heat recovery of hot solid granule. However, the relevant technology of heat transfer enhancement is still in advancing. In this work, discrete element method (DEM) was applied to investigate the heat transfer of granular flow around different fin elements. It was found that, the fin can increase the heat transfer area so that the heat transfer is significantly improved, while the detailed characteristics of granular flow will differ with the fin element. The heat transfer between the granular flow and different surfaces, is integrated by the particle update, the particle contact, the competitive particle mixing as well as the surface area. In general, in the upstream side, the inclined plane can increase the area with the relatively smooth flow. Therefore, it is more beneficial to improve the heat transfer. By contrast, the arc surface has more advantages in the downstream, because the particle contact and the competitive particle mixing will account for more roles here. © 2021, Science Press. All right reserved.

Keyword :

Fins (heat exchange) Mixing Waste heat Heat transfer Confined flow Finite difference method Granular materials Waste heat utilization

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GB/T 7714 Guo, Zhi-Gang , Yang, Jian , Tian, Xing et al. Numerical Study on Heat Transfer Characteristic of Granular Flow Around Different Fin Elements [J]. | Journal of Engineering Thermophysics , 2021 , 42 (4) : 1015-1020 .
MLA Guo, Zhi-Gang et al. "Numerical Study on Heat Transfer Characteristic of Granular Flow Around Different Fin Elements" . | Journal of Engineering Thermophysics 42 . 4 (2021) : 1015-1020 .
APA Guo, Zhi-Gang , Yang, Jian , Tian, Xing , Tan, Zhou-Tuo , Wang, Qiu-Wang . Numerical Study on Heat Transfer Characteristic of Granular Flow Around Different Fin Elements . | Journal of Engineering Thermophysics , 2021 , 42 (4) , 1015-1020 .
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Effect of pyrolytic reaction of supercritical aviation kerosene RP-3 on heat and mass transfer in the near-wall region EI SCIE
期刊论文 | 2021 , 197 | APPLIED THERMAL ENGINEERING
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The high concentration of pyrolytic unsaturated hydrocarbons in the near-wall region will generate surface fouling in the regenerative cooling passage, which dramatically deteriorates heat transfer performance. In the present study, the heat and mass transfer processes are investigated by a numerical method to evaluate the mass distribution of pyrolytic products in the near-wall region. A detailed pyrolysis model of RP-3 aviation fuel is incorporated to analyze the pyrolysis process in the regenerative cooling passage. The results indicate that the enhanced heat transfer performance in reacting flow is attributed to the extra heat-absorbing capacity and the flow acceleration caused by the pyrolytic reaction. Besides, because of flow transition and the ultrahigh wall temperature, the near-wall mass fraction of RP-3 decreases first and then increases at the initial heated section. The concentration of products has a transient peak value, which means there is a high risk of carbon deposition at the initial heated section. In addition, the combined influences of flow transition, wall temperature and mass fraction result in the primary reaction rate experiencing three peaks in the near-wall region when the heat flux reaches 2.5 MW/m(2).

Keyword :

Aviation kerosene Pyrolytic reaction Supercritical pressure Near-wall region Heat and mass transfer

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GB/T 7714 Tian, Ke , Yang, Ping , Tang, Zicheng et al. Effect of pyrolytic reaction of supercritical aviation kerosene RP-3 on heat and mass transfer in the near-wall region [J]. | APPLIED THERMAL ENGINEERING , 2021 , 197 .
MLA Tian, Ke et al. "Effect of pyrolytic reaction of supercritical aviation kerosene RP-3 on heat and mass transfer in the near-wall region" . | APPLIED THERMAL ENGINEERING 197 (2021) .
APA Tian, Ke , Yang, Ping , Tang, Zicheng , Wang, Jin , Zeng, Min , Wang, Qiuwang . Effect of pyrolytic reaction of supercritical aviation kerosene RP-3 on heat and mass transfer in the near-wall region . | APPLIED THERMAL ENGINEERING , 2021 , 197 .
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Numerical Investigations of Film Cooling and Particle Impact on the Blade Leading Edge EI SCIE
期刊论文 | 2021 , 14 (4) | ENERGIES
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As a vital power propulsion device, gas turbines have been widely applied in aircraft. However, fly ash is easily ingested by turbine engines, causing blade abrasion or even film hole blockage. In this study, a three-dimensional turbine cascade model is conducted to analyze particle trajectories at the blade leading edge, under a film-cooled protection. A deposition mechanism, based on the particle sticking model and the particle detachment model, was numerically investigated in this research. Additionally, the invasion efficiency of the AGTB-B1 turbine blade cascade was investigated for the first time. The results indicate that the majority of the impact region is located at the leading edge and on the pressure side. In addition, small particles (1 mu m and 5 mu m) hardly impact the blade's surface, and most of the impacted particles are captured by the blade. With particle size increasing, the impact efficiency increases rapidly, and this value exceeds 400% when the particle size is 50 mu m. Invasion efficiencies of small particles (1 mu m and 5 mu m) are almost zero, and the invasion efficiency approaches 12% when the particle size is 50 mu m.

Keyword :

leading edge film cooling invasion efficiency impact efficiency capture efficiency particle trajectory

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GB/T 7714 Tian, Ke , Tang, Zicheng , Wang, Jin et al. Numerical Investigations of Film Cooling and Particle Impact on the Blade Leading Edge [J]. | ENERGIES , 2021 , 14 (4) .
MLA Tian, Ke et al. "Numerical Investigations of Film Cooling and Particle Impact on the Blade Leading Edge" . | ENERGIES 14 . 4 (2021) .
APA Tian, Ke , Tang, Zicheng , Wang, Jin , Vujanovic, Milan , Zeng, Min , Wang, Qiuwang . Numerical Investigations of Film Cooling and Particle Impact on the Blade Leading Edge . | ENERGIES , 2021 , 14 (4) .
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Heat and mass transfer advances for energy conservation and pollution control in a renewable and sustainable energy transition EI SCIE
期刊论文 | 2021 , 145 | RENEWABLE & SUSTAINABLE ENERGY REVIEWS
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This Virtual Special Issue includes six peer-reviewed papers, which were selected from the plenary lectures, keynote lectures and conference papers at the 5th International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control (IWHT2019) in Novosibirsk, Russia on August 13-16, 2019. The topics of these papers mainly focus on the heat and mass transfer in energy, power and industrial process systems, including heat exchanger used for floating liquefied natural gas, methane hydrate reservoir, supercritical carbon dioxide Brayton cycle, proton exchange membrane fuel cell, and distillation columns with structured packing. The machine learning methods used for nanofluid research in renewable and sustainable energy systems were also discussed. The studies in this special issue will inform the development of energy conservation and pollution control technologies, which is the purpose of IWHT, and will also support the global decarbonisation of heat and mass transfer systems.

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GB/T 7714 Ma, Ting , Chen, Yitung , Pavlenko, Aleksandr N. et al. Heat and mass transfer advances for energy conservation and pollution control in a renewable and sustainable energy transition [J]. | RENEWABLE & SUSTAINABLE ENERGY REVIEWS , 2021 , 145 .
MLA Ma, Ting et al. "Heat and mass transfer advances for energy conservation and pollution control in a renewable and sustainable energy transition" . | RENEWABLE & SUSTAINABLE ENERGY REVIEWS 145 (2021) .
APA Ma, Ting , Chen, Yitung , Pavlenko, Aleksandr N. , Wang, Qiuwang . Heat and mass transfer advances for energy conservation and pollution control in a renewable and sustainable energy transition . | RENEWABLE & SUSTAINABLE ENERGY REVIEWS , 2021 , 145 .
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Numerical Study on Flow and Heat Transfer Performance of Natural Gas in a Printed Circuit Heat Exchanger During Transcritical Liquefaction EI SCIE
期刊论文 | 2021 , 143 (4) | JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
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The main cryogenic heat exchanger is a core piece of equipment in the liquefaction of natural gas. The printed circuit heat exchanger is gradually becoming a primary choice for the main cryogenic heat exchanger, because it has good pressure resistance, high efficiency, and compactness. In this work, a numerical simulation is conducted to examine the local flow and heat transfer characteristics of natural gas in the printed circuit heat exchanger during trans-critical liquefaction. It is found that the heat flux density reaches a minimum value and the heat transfer is the worst when the temperature difference between the hot and cold sides is the smallest. Owing to the large variations in physical properties of trans-critical natural gas, the local pressure drop exhibits an upward parabolic shape along the flow direction, and the pressure drop reaches a minimum value near the pseudo-critical point. Finally, the friction factor and heat transfer correlations for natural gas during trans-critical liquefaction are fitted.

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GB/T 7714 Ma, Ting , Zhang, Pan , Lian, Jie et al. Numerical Study on Flow and Heat Transfer Performance of Natural Gas in a Printed Circuit Heat Exchanger During Transcritical Liquefaction [J]. | JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME , 2021 , 143 (4) .
MLA Ma, Ting et al. "Numerical Study on Flow and Heat Transfer Performance of Natural Gas in a Printed Circuit Heat Exchanger During Transcritical Liquefaction" . | JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME 143 . 4 (2021) .
APA Ma, Ting , Zhang, Pan , Lian, Jie , Ke, Hanbing , Wang, Wei , Lin, Yuansheng et al. Numerical Study on Flow and Heat Transfer Performance of Natural Gas in a Printed Circuit Heat Exchanger During Transcritical Liquefaction . | JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME , 2021 , 143 (4) .
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