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< Page ,Total 24 >
Internal and external flow characteristics of multi-nozzle spray with liquid nitrogen EI SCIE
期刊论文 | 2021 , 114 | Cryogenics
WoS CC Cited Count: 1
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Abstract :

The multi-nozzle spray cooling with liquid nitrogen can achieve high heat transfer rate and uniform temperature for a large-scale environmental simulation system. The understanding of the flow characteristics is crucial to the accurate control of the mass flow rates and the temperature distribution in a cryogenic system. This article combines the experimental and numerical approach to reveal the external and internal flow characteristics of the multi-nozzle spray with liquid nitrogen. It is found that a higher injection pressure is followed by an increasing mass flow rate under a given nozzle combination. The number and position of the low-temperature region in the downstream field correspond to the number and the arrangement of spraying nozzles under each combination. The pressure differences have little effect on the spray cone angle of a single-nozzle. The flow swirl is induced by the slotted swirl in the nozzle chamber and the cavitation is caused by the abrupt change structure at the orifice. In the absence of the friction and the resistance, the ratio of the mass flow rate in the multi-nozzles to that in the single-nozzle is basically equal to the ratio of the nozzle numbers. And the nearly equal amount of liquid nitrogen flows into each single nozzle of a multi-nozzle array under the varied injection pressure and inlet temperature conditions. The experimental research and the theoretical analysis are to provide insights on the practical engineering application of the multi-nozzle spray cooling in a cryogenic environmental simulation system. © 2021

Keyword :

Spray nozzles Liquefied gases Liquid nitrogen Spray steelmaking Temperature Mass transfer Cooling

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GB/T 7714 Xue, Rong , Ruan, Yixiao , Liu, Xiufang et al. Internal and external flow characteristics of multi-nozzle spray with liquid nitrogen [J]. | Cryogenics , 2021 , 114 .
MLA Xue, Rong et al. "Internal and external flow characteristics of multi-nozzle spray with liquid nitrogen" . | Cryogenics 114 (2021) .
APA Xue, Rong , Ruan, Yixiao , Liu, Xiufang , Zhong, Xin , Chen, Liang , Hou, Yu . Internal and external flow characteristics of multi-nozzle spray with liquid nitrogen . | Cryogenics , 2021 , 114 .
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Experimental study on vaporous cavitation of R134a in micron clearance EI SCIE
期刊论文 | 2021 , 129 | EXPERIMENTAL THERMAL AND FLUID SCIENCE
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Abstract :

Cavitation is likely to occur in micron clearance, which affects the efficiency and reliability of the fluid machinery. Due to the confinement effect and high-speed shearing, evolution process of cavitation bubbles takes on new characteristics in the confined clearance. In this paper, a visualized experimental apparatus was developed based on the structural characteristics of micron clearance. The cavitation characteristics and bubble dynamics of R134a in divergent and convergent flow path are captured in the high-speed visualization experiment. For the single cavitation bubble, the growth, deformation and fragmentation processes are investigated under different subcooling degrees and clearance heights. The shape and growth process of single-bubble is captured during experiment. The fitting curves are obtained based on the flow and the single-bubble morphology in the micron clearance. The occurrence probability of single-bubble and bubble cluster varies with subcooling degree, clearance height and pressure difference.

Keyword :

Cavitation Confinement effect Micron clearance Bubble dynamics High speed shearing

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GB/T 7714 Lai, Tianwei , Yan, Shaohang , Wang, Yanwu et al. Experimental study on vaporous cavitation of R134a in micron clearance [J]. | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2021 , 129 .
MLA Lai, Tianwei et al. "Experimental study on vaporous cavitation of R134a in micron clearance" . | EXPERIMENTAL THERMAL AND FLUID SCIENCE 129 (2021) .
APA Lai, Tianwei , Yan, Shaohang , Wang, Yanwu , Liu, Xue , Yang, Shenyin , Ding, Pei et al. Experimental study on vaporous cavitation of R134a in micron clearance . | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2021 , 129 .
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Application of Gas Foil Bearings in China SCIE
期刊论文 | 2021 , 11 (13) | APPLIED SCIENCES-BASEL
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Abstract :

Gas foil bearing has been widely used in high-speed turbo machinery due to its oil-free, wide temperature range, low cost, high adaptability, high stability and environmental friendliness. In this paper, state-of-the-art investigations of gas foil bearings are reviewed, mainly on the development of the high-speed turbo machinery in China. After decades of development, progress has been achieved in the field of gas foil bearing in China. Small-scale applications of gas foil bearing have been realized in a variety of high-speed turbo machinery. The prospects and markets of high-speed turbo machinery are very broad. Various high-speed turbomachines with gas foil bearings have been developed. Due to the different application occasions, higher reliability requirements are imposed on the foil bearing technology. Therefore, its design principle, theory, and manufacturing technology should be adaptive to new application occasions before mass production. Thus, there are still a number of inherent challenges that must be addressed, for example, thermal management, rotor-dynamic stability and wear-resistant coatings.

Keyword :

turbo machinery industrial application foil bearing gas bearing

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GB/T 7714 Hou, Yu , Zhao, Qi , Guo, Yu et al. Application of Gas Foil Bearings in China [J]. | APPLIED SCIENCES-BASEL , 2021 , 11 (13) .
MLA Hou, Yu et al. "Application of Gas Foil Bearings in China" . | APPLIED SCIENCES-BASEL 11 . 13 (2021) .
APA Hou, Yu , Zhao, Qi , Guo, Yu , Ren, Xionghao , Lai, Tianwei , Chen, Shuangtao . Application of Gas Foil Bearings in China . | APPLIED SCIENCES-BASEL , 2021 , 11 (13) .
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Thermodynamic analysis of the para-to-ortho hydrogen conversion in cryo-compressed hydrogen vessels for automotive applications EI SCIE
期刊论文 | 2020 , 45 (46) , 24928-24937 | International Journal of Hydrogen Energy | IF: 5.816
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Abstract :

Cryo-compressed hydrogen storage has potential applications in fuel-cell vehicles due to its large storing density and thermal endurance. The dormancy of storage can be extended when considering the endothermic conversion of para-to-ortho hydrogen. In present study, a thermodynamic model is established to analyze the effect of the conversion in a cryogenic pressure vessel. The influence of the parameters such as the filling density, initial temperature and initial ortho hydrogen fraction is studied. It is demonstrated that different 'transition pressures' for the vessels exist for different filling densities. The conversion can carry out sufficiently and the dormancy can be extended significantly when the designed release pressure of the vessel matches with the transition pressure. The heat of absorption increases with the initial o-H2 fraction, whereas the peak of conversion rate occurs earlier for the vessel with a large initial o-H2 fraction. The dormancy can be extended by 163% for the vessel with filling density of 70 kg/m3. The investigations on the effect of the para-to-ortho hydrogen conversion can provide useful guideline for the design of cryo-compressed hydrogen vessels. © 2020 Hydrogen Energy Publications LLC

Keyword :

Filling Thermodynamic properties Fuel cells Hydrogen storage Thermoanalysis

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GB/T 7714 Chen, Liang , Xiao, Runfeng , Cheng, Cheng et al. Thermodynamic analysis of the para-to-ortho hydrogen conversion in cryo-compressed hydrogen vessels for automotive applications [J]. | International Journal of Hydrogen Energy , 2020 , 45 (46) : 24928-24937 .
MLA Chen, Liang et al. "Thermodynamic analysis of the para-to-ortho hydrogen conversion in cryo-compressed hydrogen vessels for automotive applications" . | International Journal of Hydrogen Energy 45 . 46 (2020) : 24928-24937 .
APA Chen, Liang , Xiao, Runfeng , Cheng, Cheng , Tian, Gui , Chen, Shuangtao , Hou, Yu . Thermodynamic analysis of the para-to-ortho hydrogen conversion in cryo-compressed hydrogen vessels for automotive applications . | International Journal of Hydrogen Energy , 2020 , 45 (46) , 24928-24937 .
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Selection and strength check on fasteners of protective structure in cryogenic wind tunnel EI Scopus
会议论文 | 2020 , 1605 (1) | 2020 International Conference on Internet of Things, Artificial Intelligence and Mechanical Automation, IoTAIMA 2020
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Abstract :

Protective structure, acted as a substructure of internal insulation system in cryogenic wind tunnel, is in possession of such advantages of isolating insulation unit from cryogenic medium and reducing cold energy loss. However, the protective structure is continuously subjected to alternating pressure during the operation of cryogenic wind tunnel. Thus, the type selection and strength check on connecting fastener, acted as weak bearing component in protective structure, are investigated. Firstly, according to the composition of protective structure, three key connecting positions are determined and the corresponding connecting fasteners are selected. Then, according to the cryogenic wind tunnel working condition, the theoretical mechanical models of connecting fasteners are built under different working conditions. Finally, involving the force and moment balance, mechanics analysis and strength check are conducted on connecting fasteners. The obtained results show that the selected fasteners are conformed to the strength requirement of cryogenic wind tunnel in service, which paves the way for building the cryogenic wind tunnel in the future. © 2020 Published under licence by IOP Publishing Ltd.

Keyword :

Artificial intelligence Internet of things Wind tunnels Fasteners Cryogenics Energy dissipation

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GB/T 7714 Yuan-Jia, Song , Huan, Lai , Wan-Hua, Chen et al. Selection and strength check on fasteners of protective structure in cryogenic wind tunnel [C] . 2020 .
MLA Yuan-Jia, Song et al. "Selection and strength check on fasteners of protective structure in cryogenic wind tunnel" . (2020) .
APA Yuan-Jia, Song , Huan, Lai , Wan-Hua, Chen , Wei, Zhang , Yu, Hou . Selection and strength check on fasteners of protective structure in cryogenic wind tunnel . (2020) .
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Experimental study on the frosting characteristics of round tube in confined circular flow path at low temperature EI SCIE
期刊论文 | 2020 , 171 | Applied Thermal Engineering | IF: 5.295
WoS CC Cited Count: 3
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Abstract :

Frosting in confined spaces usually takes places on the cold surfaces in heat exchangers and other equipment. In order to study the frosting characteristics on the surface of a round tube in a confined space, a test rig is developed capable of visualizing transient frosting. The periodic melting and refrosting phenomena are captured and analyzed with the wall surface temperature of −60 °C. The roles of humid air velocity, air temperature, relative humidity and cold surface temperature on frosting have been expounded independently. Along the air flow path, the frosting thickness, accumulation, heat transfer rate and average density are compared under different air velocities, air temperatures, clod surface temperature and relative humidity and the correlations are proposed from dimensionless parameters. The results show that obvious stepwise periodic frosting and frost-melting appear due to the thermal resistance and heat transfer between the frost and the humid air when the frosting entered the mature stage. At a higher tube temperature, air temperature and relative humidity, the frosting melting and undulations emerged more frequently and the frost accumulation, heat transfer rate and average density increased. The frost layer thickness is uneven along the air flow path, which possesses the highest value in the middle position of tube and the lowest near the air inlet. © 2020

Keyword :

Surface properties Heat resistance Heat exchangers Melting Tubes (components) Air Heat transfer Atmospheric temperature

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GB/T 7714 Lai, Tianwei , Ding, Pei , Dong, Xiaojun et al. Experimental study on the frosting characteristics of round tube in confined circular flow path at low temperature [J]. | Applied Thermal Engineering , 2020 , 171 .
MLA Lai, Tianwei et al. "Experimental study on the frosting characteristics of round tube in confined circular flow path at low temperature" . | Applied Thermal Engineering 171 (2020) .
APA Lai, Tianwei , Ding, Pei , Dong, Xiaojun , Zhang, Beile , Chen, Xiaozhuan , Hou, Yu . Experimental study on the frosting characteristics of round tube in confined circular flow path at low temperature . | Applied Thermal Engineering , 2020 , 171 .
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Numerical study on two-phase expansion performance and quantitative analysis of wetness loss in cryogenic turbo-expander EI SCIE CPCI-S
期刊论文 | 2020 , 110 | Cryogenics | IF: 2.226
WoS CC Cited Count: 1
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Abstract :

Cryogenic two-phase turbo-expander becomes a prevalent option in process design of high efficiency cryogenic liquefaction system, especially in modern air separation system and helium system. Computational code of turbine off-design performance prediction in overheated expansion and non-equilibrium condensation module are well established in our former works, and the mechanism of nucleation and droplet growth in spontaneous condensation is revealed. However, the analysis between single and two-phase expansion as well as wetness influence on turbine performance is not conducted yet. In this study, we investigate a turbo-expander performance analysis in a wide temperature range (Tin = 118 K ~ 98 K), and present the wetness loss assessment and quantitative calculation in two-phase expansion process. By referring to the previous off-design performance of overheated expansion, the two-phase expansion performance under different pressure ratio and rotational speed is obtained and compared. According to the continuous inlet temperature drop process, the expansion is categorized into three types and their zone boundaries are divided. The transitional feature of unexpected change is frequently figured out on the expansion zone boundary, and the reaction ratio and pressure ratio in diffuser during the continuous inlet temperature drop process are analyzed detailed, which shows the unique and significant role of wetness effect in two-phase expansion. Based on the experimental wetness loss assessment method established by Baumann in wet steam turbine, two numerical assessments by using overheated expansion and equilibrium condensation model as reference expansion are analyzed. To quantitatively analyze the wetness loss influence, the efficiency drop caused by wetness and the relative wetness loss are calculated by eliminating other component losses in turbine, and the relative wetness loss is fitted with outlet liquid mass fraction mathematically to assist future design of cryogenic two-phase turbo-expanders. © 2020 Elsevier Ltd

Keyword :

Drops Efficiency Numerical methods Cryogenics Steam condensers Condensation Turboexpanders

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GB/T 7714 Niu, Lu , Zhong, Zhigang , Hong, Xingfu et al. Numerical study on two-phase expansion performance and quantitative analysis of wetness loss in cryogenic turbo-expander [J]. | Cryogenics , 2020 , 110 .
MLA Niu, Lu et al. "Numerical study on two-phase expansion performance and quantitative analysis of wetness loss in cryogenic turbo-expander" . | Cryogenics 110 (2020) .
APA Niu, Lu , Zhong, Zhigang , Hong, Xingfu , Chen, Shuangtao , Hou, Yu . Numerical study on two-phase expansion performance and quantitative analysis of wetness loss in cryogenic turbo-expander . | Cryogenics , 2020 , 110 .
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The Influence of Internal Heat Exchanger on the Performance of Transcritical CO2 Water Source Heat Pump Water Heater EI SCIE Scopus
期刊论文 | 2020 , 13 (7) | ENERGIES | IF: 3.004
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Abstract :

The characteristics of the transcritical CO2 heat pump water heater (HPWH) system are; a lower inlet hot water temperature (Ti-hw) (sometimes this is lower than the water source temperature), and an outlet gas cooler temperature (To-gc) which is affected by the Ti-hw and often lower than the critical temperature. In order to study the effects of the internal heat exchanger (IHX) on the operational performance of the transcritical CO2 HPWH when To-gc is low, a transcritical CO2 water source HPWH experiment platform is established to conduct experimental research and comparative analysis on the operational performance of the transcritical CO2 water source HPWH, with or without IHX. It is found that, if only the coefficient of performance (COP) and heating at the optimal exhaust pressure of the transcritical CO2 water source HPWH were considered, COP and the heating of the non-IHX system would be slightly higher than those of the IHX system at the lower hot water flow and water source temperature, and this increase was not obvious. At the higher hot water flow rate and water source temperature, COP and the heating of the non-IHX system were also higher than those of the IHX system, and the increase was obvious. The experiment results showed that, near the optimal exhaust pressure, the variation range of COP and heating of the IHX system is relatively small, and the system has a relatively high stability.

Keyword :

internal heat exchanger transcritical CO2 heat pump water heater

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GB/T 7714 Feng, Fan , Zhang, Ze , Liu, Xiufang et al. The Influence of Internal Heat Exchanger on the Performance of Transcritical CO2 Water Source Heat Pump Water Heater [J]. | ENERGIES , 2020 , 13 (7) .
MLA Feng, Fan et al. "The Influence of Internal Heat Exchanger on the Performance of Transcritical CO2 Water Source Heat Pump Water Heater" . | ENERGIES 13 . 7 (2020) .
APA Feng, Fan , Zhang, Ze , Liu, Xiufang , Liu, Changhai , Hou, Yu . The Influence of Internal Heat Exchanger on the Performance of Transcritical CO2 Water Source Heat Pump Water Heater . | ENERGIES , 2020 , 13 (7) .
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Flow boiling of low-pressure water in microchannels of large aspect ratio EI SCIE Scopus
期刊论文 | 2020 , 13 (11) | Energies | IF: 3.004
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

Flow boiling heat transfer in microchannels can provide a high cooling rate, while maintaining a uniform wall temperature, which has been extensively studied as an attractive solution for the thermal management of high-power electronics. The depth-to-width ratio of the microchannel is an important parameter, which not only determines the heat transfer area but also has dominant effect on the heat transfer mechanisms. In the present study, numerical simulations based on the volume of fraction models are performed on the flow boiling in very deep microchannels. The effects of the depth-to-width ratio on the heat transfer coefficient and pressure drop are discussed. The bubble behavior and heat transfer characteristics are analyzed to explain the mechanism of heat transfer enhancement. The results show the very deep microchannels can effectively enhance the heat transfer, lower the temperature rise and show promising applications in the thermal management of high-power electronics. © 2020 by the authors.

Keyword :

Heat transfer coefficients Aspect ratio Temperature control Power electronics Microchannels Electronic cooling

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GB/T 7714 Chen, Liang , Li, Xingchen , Xiao, Runfeng et al. Flow boiling of low-pressure water in microchannels of large aspect ratio [J]. | Energies , 2020 , 13 (11) .
MLA Chen, Liang et al. "Flow boiling of low-pressure water in microchannels of large aspect ratio" . | Energies 13 . 11 (2020) .
APA Chen, Liang , Li, Xingchen , Xiao, Runfeng , Lv, Kunpeng , Yang, Xue , Hou, Yu . Flow boiling of low-pressure water in microchannels of large aspect ratio . | Energies , 2020 , 13 (11) .
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Numerical investigation of pulse tube refrigerator with inertance tube-gas reservoir phase modulation EI
会议论文 | 2019 , 2019-August , 329-337 | 25th IIR International Congress of Refrigeration, ICR 2019
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Abstract :

This paper presents a numerical study on a coaxial pulse tube refrigerator(PTR) with inertance tube-gas reservoir as the phase modulation device. A two-dimensional model is developed to describe the oscillating flow in the regenerator, cold-end heat exchanger, pulse tube and warm-end heat exchanger, while a 1D model is employed to describe the phase modulation by the inertance tube. The boundary condition at the warm end of regenerator is the sinusoidal pressure wave of a mean value of 3.0 MPa, an amplitude of 0.07 MPa and a frequency of 34 Hz. Based on the simulation results, the influence of inertance tube-gas reservoir device on the temperature and velocity distribution profile is obtained. The transient variations of velocity near the wall lead that at the other points at the same cross section in the pulse tube. Velocity oscillations with large magnitudes are observed near the center of the cold end heat exchanger due to the presence of the empty volume. Besides, the anisotropy thermal conductivity of porous medium has a significant effect on the performance. The cryocooler can reach a minimum temperature of 86 K when a small value of axial thermal conductivity is applied, which is 15 K lower than that of the case with isotropic thermal conductivity. © 2019 International Institute of Refrigeration. All rights reserved.

Keyword :

Porous materials Tubes (components) Oscillating flow Velocity distribution Thermal conductivity Refrigeration Regenerators IIR filters Phase modulation Computational fluid dynamics Petroleum reservoirs Refrigerators

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GB/T 7714 Wang, Wenbin , Chen, Liang , Liang, Menglin et al. Numerical investigation of pulse tube refrigerator with inertance tube-gas reservoir phase modulation [C] . 2019 : 329-337 .
MLA Wang, Wenbin et al. "Numerical investigation of pulse tube refrigerator with inertance tube-gas reservoir phase modulation" . (2019) : 329-337 .
APA Wang, Wenbin , Chen, Liang , Liang, Menglin , Liu, Yanjie , Chen, Shuangtao , Hou, Yu . Numerical investigation of pulse tube refrigerator with inertance tube-gas reservoir phase modulation . (2019) : 329-337 .
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