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Numerical Simulation Study on Cooling Characteristics of a New Type of Film Hole 认领
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作者 GUO Chunhai WANG Bin +2 位作者 KANG Zhenya ZHANG Wenwu ZHENG Huilong 《热科学学报:英文版》 SCIE EI CAS 2021年第1期210-219,共10页
A new type of film cooling hole with micro groove structure is presented in this paper.Based on the finite volume method and the Realizable k-εmodel,the film cooling process of the hole in a flat plate structure is s... A new type of film cooling hole with micro groove structure is presented in this paper.Based on the finite volume method and the Realizable k-εmodel,the film cooling process of the hole in a flat plate structure is simulated.The surface temperature distribution and film cooling effect of different film cooling holes were analyzed.The effects of micro-groove structure on wall attachment and cooling efficiency of jet were discussed.The results show that under the same conditions,the transverse coverage width and overall protective area of the new micro-groove holes are larger than those of the ordinary cylindrical holes and special-shaped holes.Compared with ordinary holes,the new micro-groove holes can better form the film covering on the surface and enhance the overall film cooling efficiency of the wall.For example,when the blowing ratio M=1.5,the effective coverage ratio of micro-groove holes is 1.5 times the dustpan holes and is 8 times the traditional cylindrical holes.It provides reference data and experience rules for the optimization and selection of advanced cooling structure of high performance aero-gas engine hot-end components. 展开更多
关键词 film cooling shaped hole numerical simulation optimal design cooling efficiency
Numerical study on indoor environment and thermal comfort in train station waiting hall with two different air-conditioning modes 认领
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作者 Biyao Zhuang Juan Shi Zhenqian Chen 《建筑模拟(英文)》 SCIE EI 2021年第2期337-349,共13页
With the increasing size of the waiting hall,the large-area use of transparent envelope materials makes the interior surface temperature of the envelope too high,which puts forward higher requirements for the control ... With the increasing size of the waiting hall,the large-area use of transparent envelope materials makes the interior surface temperature of the envelope too high,which puts forward higher requirements for the control of environment and thermal comfort indoors.In this paper,the characteristics of indoor temperature distribution,relative humidity distribution and thermal comfort under the all air system(AAs)and the radiant floor cooling and wall cooling combined with air supply system(RC/ASs)were investigated in the large spaces.The computational fluid dynamics(CFD)method was used,and the performance of the CFD model was validated by comparing the measured results with CFD simulation results in the AAs.The numerical results clearly showed that the temperature and relative humidity indoors could satisfy the design requirement both in the AAs and RC/ASs.The indoor air distribution in most areas under the RC/ASs was more uniform based on the indoor heat and humidity requirements under the cooling load of measured day.In the AAs,the total cooling capacity of air conditioning unit was the highest when indoor thermal comfort was the best,that meant that to achieve the best working condition,the air-conditioning system need high energy consumption.Meanwhile,the RC/ASs addressed the problem that the temperature around the seated passengers in the waiting area was relatively high in the AAs.This paper will provide reference for the air conditioning system design in the similar large spaces in the future. 展开更多
关键词 radiant floor cooling radiant wall cooling large spaces thermal comfort
A Composite Cooling Powder and Its Thixotropic Hydrogel 认领
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作者 Mingxi Chen 《化学工程与科学期刊(英文)》 2021年第1期29-37,共9页
Due to large volume and high hardness of thermal insulation materials mostly used in high temperature fields, a composite cooling powder and its thixotropic hydrogel for thermal protection are presented. The core of c... Due to large volume and high hardness of thermal insulation materials mostly used in high temperature fields, a composite cooling powder and its thixotropic hydrogel for thermal protection are presented. The core of composite cooling material powder is super absorbent polymer, composing with metal salt, polysaccharide hydrosol and inorganic particles and other modifiers through a series of composite process, which can be easily stored for a long time. When needed, the powder can be mixed with water to obtain a kind of thixotropic hydrogel in a very short time. Experimental results show this thermal protection technology with thixotropic ability has excellent thermal protection performance, meanwhile flexible, adhesive and low cost, which exerts instantaneous cooling, efficient thermal protection and long-lasting flame-retardant protection. 展开更多
关键词 Composite Powder HYDROGEL Super Absorbent Polymer Thixotropic COOLING Thermal Protection
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Simple Measurement of Carbon Films on Copper Tubes and Their Effects on Corrosion 认领
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作者 Takashi Iyasu Motoki Kuratani +3 位作者 Itaru Ikeda Noriyuki Tanaka Yutaka Yamada Osamu Sakurada 《复合材料期刊(英文)》 2021年第1期12-22,共11页
It has been reported that pitting corrosion in copper tubes occurs due to the effect of a carbon film produced by the influence of undergoing an oil and heat treatment. As a quantitative method for determining the res... It has been reported that pitting corrosion in copper tubes occurs due to the effect of a carbon film produced by the influence of undergoing an oil and heat treatment. As a quantitative method for determining the residual carbon amount, it has been reported that the inner surface of a copper tube can be dissolved with a mixed acid to collect and analyze the adhering carbon;however, this method is dangerous and difficult. Therefore, two methods were examined as a simple quantitative method for obtaining the residual carbon amount using copper tubes with known residual carbon amounts. One method utilizes X-ray photoelectron spectroscopy (XPS), and the other method utilizes the potential difference between the carbon film-adhered surface and carbon film-removed surface. In regard to XPS measurement, a linear correlation was found between the spectral intensity of C and the residual carbon amount;therefore, XPS measurements were considered to be effective as a simple measurement method for the carbon film on the inner surface of a copper tube. In the evaluation method by measuring the corrosion potential, a correlation was observed between the potential difference ΔE and the residual carbon amount of the inner surface of the tube and the outer surface of the polished tube. It is considered possible to estimate the residual carbon amount from the prepared calibration curve. Through these studies, it is suggested that the carbon film was non-uniformly present on the surface of the copper tube. Therefore, the galvanic current was measured, and the effect of a non-uniform carbon film on corrosion behavior was investigated. As a result, in the measurement of galvanic current, the current flowed from the copper tube with a large amount of residual carbon (cathode) to the copper tube with a small amount of residual carbon (anode). In addition, the higher the area ratio of the carbon film was, the larger the galvanic current tended to be. 展开更多
关键词 Copper Tube Residual Carbon Pitting Corrosion Cooling Water System Re-frigerator XPS
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文章速递熔体齿轮泵轴承故障分析及延长轴承寿命措施 认领
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作者 张胜国 韩君炎 张绍英 《合成技术及应用》 2021年第1期56-62,共7页
熔体齿轮泵的可靠性是影响聚酯装置连续稳定运行的关键因素之一。对熔体齿轮泵运转中出现的齿轮断轴、轴承开裂故障,从滑动轴承受力、动压油膜承载能力及油膜承载能力的影响因素三个方面加以分析,从中找出故障原因,通过合理选材、针对... 熔体齿轮泵的可靠性是影响聚酯装置连续稳定运行的关键因素之一。对熔体齿轮泵运转中出现的齿轮断轴、轴承开裂故障,从滑动轴承受力、动压油膜承载能力及油膜承载能力的影响因素三个方面加以分析,从中找出故障原因,通过合理选材、针对性地维护、规范操作,延长熔体齿轮泵运行寿命,取得良好效果,减少故障损失,节约检修费用。 展开更多
关键词 齿轮泵 滑动轴承 润滑膜 承载能力 间隙 冷却
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文章速递碾压混凝土大坝大升层施工温控技术 认领
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作者 黄艳梅 《四川水力发电》 2021年第1期21-24,共4页
碾压混凝土高坝施工中的升层高度直接影响施工进度,经济、高效的大升层施工是其首选。对于体形庞大的大坝混凝土而言,大升层意味着大体积。如何解决混凝土水化热带来的温度升高问题就成为迫在眉睫的重中之重,必须采取有效的温控手段控... 碾压混凝土高坝施工中的升层高度直接影响施工进度,经济、高效的大升层施工是其首选。对于体形庞大的大坝混凝土而言,大升层意味着大体积。如何解决混凝土水化热带来的温度升高问题就成为迫在眉睫的重中之重,必须采取有效的温控手段控制混凝土裂缝的发生。乌弄龙水电站大坝混凝土施工通过温控计算与分析后,从混凝土配合比、出机口温度、运输过程、浇筑过程、通水冷却等方面采取了有效的温控措施,质量可靠,所取得的经验值得类似工程推广应用。介绍了所采用的温控措施。 展开更多
关键词 大升层 温度 冷却 配合比 乌弄龙水电站
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文章速递Efficient loading of ultracold sodium atoms in an optical dipole trap from a high power fiber laser 认领
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作者 徐静 刘文良 +7 位作者 郑宁宣 李玉清 武寄洲 李鹏 付永明 马杰 肖连团 贾锁堂 《中国物理B:英文版》 SCIE EI CAS CSCD 2021年第3期237-241,共5页
We report on a research of the loading of ultracold sodium atoms in an optical dipole trap,generated by two beams from a high power fiber laser.The effects of optical trap light power on atomic number,temperature and ... We report on a research of the loading of ultracold sodium atoms in an optical dipole trap,generated by two beams from a high power fiber laser.The effects of optical trap light power on atomic number,temperature and phase space density are experimentally investigated.A simple theory is proposed and it is in good accordance with the experimental results of the loaded atomic numbers.In a general estimation,an optimal value for each beam with a power of 9 W from the fiber laser is achieved.Our results provide a further understanding of the loading process of optical dipole trap and laid the foundation for generation of a sodium Bose–Einstein condensation with an optical dipole trap. 展开更多
关键词 optical dipole trap laser cooling high power fiber laser
小直径盾构施工通风及降温措施探究 认领
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作者 张敏 《工程建设与设计》 2021年第1期133-134,173,共3页
在城市市政公用地下工程建设中,最适合采用小盾构进行施工,但在长距离、小断面、复杂地层中泥水盾构施工面临的最大问题是通风效果不理想,散热差。论文根据工程特点,提出相应的通风及降温措施,并验证了该方案的可行性。
关键词 小直径 盾构 通风 降温
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Impacts of technology-guided occupant behavior on air-conditioning system control and building energy use 认领
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作者 Rui Tang Shengwei Wang Shaobo Sun 《建筑模拟(英文)》 SCIE EI 2021年第1期209-217,共9页
Occupant behavior is an important factor affecting building energy consumption.Many studies have been conducted recently to model occupant behavior and analyze its impact on building energy use.However,to achieve a re... Occupant behavior is an important factor affecting building energy consumption.Many studies have been conducted recently to model occupant behavior and analyze its impact on building energy use.However,to achieve a reduction of energy consumption in buildings,the coordination between occupant behavior and energy-efficient technologies are essential to be considered simultaneously rather than separately considering the development of technologies and the analysis of occupant behavior.It is important to utilize energy-efficient technologies to guide the occupants to avoid unnecessary energy uses.This study,therefore,proposes a new concept,“technology-guided occupant behavior”to coordinate occupant behavior with energy-efficient technologies for building energy controls.The occupants are involved into the control loop of central air-conditioning systems by actively responding to their cooling needs.On-site tests are conducted in a Hong Kong campus building to analyze the performance of“technology-guided occupant behavior”on building energy use.According to the measured data,the occupant behavior guided by the technology could achieve“cooling on demand”principle and hence reduce the energy consumption of central air-conditioning system in the test building about 23.5%,which accounts for about 7.8%of total building electricity use. 展开更多
关键词 occupant behavior occupancy detection cooling demand control energy consumption HVAC system
基于相变蓄热原理的深井钻井液降温实验研究 认领
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作者 刘均一 陈二丁 +1 位作者 李光泉 袁丽 《石油钻探技术》 CAS 北大核心 2021年第1期53-58,共6页
针对深部油气钻探开发中钻井液、井下仪器抗高温稳定性较差的问题,首次将相变材料应用于钻井液中,开展了基于相变蓄热原理的深井钻井液降温实验研究。在评价相变材料热物性的基础上,分析了相变材料的蓄热控温特性;对比评价了相变材料对... 针对深部油气钻探开发中钻井液、井下仪器抗高温稳定性较差的问题,首次将相变材料应用于钻井液中,开展了基于相变蓄热原理的深井钻井液降温实验研究。在评价相变材料热物性的基础上,分析了相变材料的蓄热控温特性;对比评价了相变材料对钻井液流变滤失性能的影响;采用自制的钻井液循环模拟实验装置,测试了钻井液降温性能实验曲线。结果表明,1#—3#相变材料的相变温度为120~145℃,相变潜热为90.3~280.6 J/g;2#相变材料的相变潜热最大,相变蓄热特性最优,其与钻井液的配伍性能良好,加量达12%时钻井液的黏度、切力和滤失量基本不变,钻井液循环温度约可降低20℃,且具有良好的重复利用价值。研究结果表明,利用相变材料的“相变蓄热原理”可以降低钻井液的循环温度,为深井高温钻井液降温提供了新的技术思路。 展开更多
关键词 钻井液 降温 相变材料 相变蓄热 模拟试验
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副产蒸汽氯化氢合成炉用纯水换热的改造 认领
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作者 孔凡锐 《氯碱工业》 CAS 2021年第1期34-35,共2页
分析了副产蒸汽氯化氢合成炉采用循环水换热过程中出现的问题,提出纯水替代循环水的改造方案及操作注意事项,并对改造效果进行了评价。
关键词 氯化氢 副产蒸汽 石墨合成炉 冷却 循环水 纯水
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Enhanced entanglement and asymmetric EPR steering between magnons 认领
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作者 Sha-Sha Zheng Feng-Xiao Sun +3 位作者 Huai-Yang Yuan Zbigniew Ficek Qi-Huang Gong Qiong-Yi He 《中国科学:物理学、力学、天文学英文版》 SCIE EI CAS 2021年第1期55-63,共9页
The generation and manipulation of strong entanglement and Einstein-Podolsky-Rosen(EPR)steering in macroscopic systems are outstanding challenges in modern physics.Especially,the observation of asymmetric EPR steering... The generation and manipulation of strong entanglement and Einstein-Podolsky-Rosen(EPR)steering in macroscopic systems are outstanding challenges in modern physics.Especially,the observation of asymmetric EPR steering is important for both its fundamental role in interpreting the nature of quantum mechanics and its application as resource for the tasks where the levels of trust at different parties are highly asymmetric.Here,we study the entanglement and EPR steering between two macroscopic magnons in a hybrid ferrimagnet—light system.In the absence of light,the two types of magnons on the two sublattices can be entangled,but no quantum steering occurs when they are damped with the same rates.In the presence of the cavity field,the entanglement can be significantly enhanced,and strong two-way asymmetric quantum steering appears between two magnons with equal dissipation.This is very different from the conventional protocols to produce asymmetric steering by imposing additional unbalanced losses or noises on the two parties at the cost of reducing steerability.The essential physics is well understood by the unbalanced population of acoustic and optical magnons under the cooling effect of cavity photons.Our finding may provide a novel platform to manipulate the quantum steering and the detection of bi-party steering provides a knob to probe the magnetic damping on each sublattice of a magnet. 展开更多
关键词 quantum information MAGNON ENTANGLEMENT Einstein-Podolsky-Rosen steering cavity induced cooling
钢网架螺栓球节点用高强度螺栓过火冷却后力学性能试验研究 认领
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作者 冯绍攀 幸坤涛 +2 位作者 王新泉 辛雷 肖树豪 《建筑结构学报》 EI CAS 北大核心 2021年第2期198-205,共8页
螺栓球钢网架结构火灾后,其螺栓球节点用高强度螺栓剩余力学性能对结构整体安全至关重要。通过对螺栓球钢网架常用的10.9 s级40Cr和35CrMn螺栓球节点用高强度螺栓进行过火冷却后力学性能试验,主要控制参数为过火温度和冷却方式,并对其... 螺栓球钢网架结构火灾后,其螺栓球节点用高强度螺栓剩余力学性能对结构整体安全至关重要。通过对螺栓球钢网架常用的10.9 s级40Cr和35CrMn螺栓球节点用高强度螺栓进行过火冷却后力学性能试验,主要控制参数为过火温度和冷却方式,并对其力学性能变化规律进行了分析,得到两种高强螺栓过火冷却后的抗拉强度变化规律。结果表明:40Cr螺栓和35CrMn螺栓的过火温度分别低于500℃和400℃时,过火温度及冷却方式对高强螺栓的力学性能影响不大;40Cr螺栓过火温度在500~800℃,35CrMn螺栓过火温度在400~800℃时,过火温度对高强螺栓的力学性能有较大影响,而冷却方式仅对伸长率影响显著;过火温度大于800℃时,冷却方式对高强螺栓的力学性能影响较大。过火温度不大于800℃时,螺栓抗拉强度可按文中拟合公式进行计算,对于40Cr高强螺栓计算公式最大误差为3.78%;对于35CrMn高强螺栓,计算公式最大误差为6.79%。 展开更多
关键词 钢网架结构 螺栓球节点用高强度螺栓 过火试验 冷却 力学性能
Neutron star cooling and GW170817 constraint within quark-meson coupling models 认领
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作者 Odilon Lourenço César H.Lenzi +6 位作者 Mariana Dutra Tobias Frederico M.Bhuyan Rodrigo Negreiros César V.Flores Guilherme Grams Débora P.Menezes 《中国物理C:英文版》 SCIE CAS 2021年第2期531-547,共17页
In the present work,we used five different versions of the quark-meson coupling(QMC)model to compute astrophysical quantities related to the GW170817 event and the neutron star cooling process.Two of the models are ba... In the present work,we used five different versions of the quark-meson coupling(QMC)model to compute astrophysical quantities related to the GW170817 event and the neutron star cooling process.Two of the models are based on the original bag potential structure and three versions consider a harmonic oscillator potential to confine quarks.The bag-like models also incorporate the pasta phase used to describe the inner crust of neutron stars.With a simple method studied in the present work,we show that the pasta phase does not play a significant role.Moreover,the QMC model that satisfies the GW170817 constraints with the lowest slope of the symmetry energy exhibits a cooling profile compatible with observational data. 展开更多
关键词 equation of state compact star cooling in stars quark-meson coupling models tidal deformability neutron star merger
Numerical investigation on cooling performance of filter in a pyrotechnic gas generator 认领
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作者 Cheng Cheng Xiaobing Zhang +1 位作者 Chong Wang Lu Wang 《Defence Technology(防务技术)》 SCIE EI CAS 2021年第2期343-351,共9页
As a key part of the pyrotechnic gas generator,the filter not only removes the particulate matter but also cools the hot gas to a safe level.This paper aims to improve the understanding of the basic heat and flow phen... As a key part of the pyrotechnic gas generator,the filter not only removes the particulate matter but also cools the hot gas to a safe level.This paper aims to improve the understanding of the basic heat and flow phenomenon in the gas generator.The pyrotechnic gas generator is modelling by a simplified filter structure with fiber arrays.A finite-volume model of the heat and fluid flow is proposed to simulate the detailed multi-dimensional flow and energy conversion behaviors.Several verification results are in good agreement with data in different references.Simulation results demonstrate that the filter can not only absorb heat from the gas but also cause the high intensity enhancement of the heat transfer.The performance difference between inline and staggered arrays is also discussed.The findings of the study put a further prediction tool for the understanding and design of the filter system with fibers. 展开更多
关键词 Pyrotechnic gas generator Cooling performance FILTER Metal fiber
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Equivalent thermal resistance minimization for a circular disc heat sink with reverting microchannels based on constructal theory and entransy theory 认领
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作者 WANG Liang XIE ZhiHui +2 位作者 CHEN LinGen WANG Rong FENG HuiJun 《中国科学:技术科学英文版》 SCIE EI CAS 2021年第1期111-121,共11页
Thermal designs for microchannel heat sinks with laminar flow are conducted numerically by combining constructal theory and entransy theory. Three types of 3-D circular disc heat sink models, i.e. without collection m... Thermal designs for microchannel heat sinks with laminar flow are conducted numerically by combining constructal theory and entransy theory. Three types of 3-D circular disc heat sink models, i.e. without collection microchannels, with center collection microchannels, and with edge collection microchannels, are established respectively. Compared with the entransy equivalent thermal resistances of circular disc heat sink without collection microchannels and circular disc heat sink with edge collection microchannels, that of circular disc heat sink with center collection microchannels is the minimum, so the overall heat transfer performance of circular disc heat sink with center collection microchannels has obvious advantages. Furthermore, the effects of microchannel branch number on maximum thermal resistance and entransy equivalent thermal resistance of circular disc heat sink with center collection microchannels are investigated under different mass flow rates and heat fluxes. With the mass flow rate increasing, both the maximum thermal resistances and the entransy equivalent thermal resistances of heat sinks with respective fixed microchannel branch number all gradually decrease. With the heat flux increasing, the maximum thermal resistances and the entransy equivalent thermal resistances of heat sinks with respective fixed microchannel branch number remain almost unchanged. With the same mass flow rate and heat flux, the larger the microchannel branch number, the smaller the maximum thermal resistance. While the optimal microchannel branch number corresponding to minimum entransy equivalent thermal resistance is 6. 展开更多
关键词 constructal theory entransy dissipation extremum principle microchannel heat sink electronics cooling generalized thermodynamic optimization
膏霜瓶注射模设计 认领
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作者 管建军 陈其发 王军 《模具工业》 2021年第1期57-60,67,共5页
通过对化妆品膏霜瓶的材料、结构和生产批量等进行分析,介绍其注射模的设计要点,阐述模具分型、排气系统、推出机构及冷却系统的设计思路。实践表明,模具推出机构运行可靠,排气设计合理,生产的塑件表面质量好、尺寸稳定。
关键词 膏霜瓶 注射模 推出机构 冷却 工艺分析
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Quantitative models for microstructure and thermal conductivity of vermicular graphite cast iron cylinder block based on cooling rate 认领
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作者 Qing-yi Liu Xiao-fu Zhang +4 位作者 Yu-cheng Sun Ai-long Jiang Ji-chao Li Hong-liang Zheng Xue-lei Tian 《中国铸造:英文版》 SCIE CAS 2021年第1期52-59,共8页
The relationships of cooling rate with microstructure and thermal conductivity of vermicular graphite cast iron(VGI) cylinder block were studied, which are important for design and optimization of the casting process ... The relationships of cooling rate with microstructure and thermal conductivity of vermicular graphite cast iron(VGI) cylinder block were studied, which are important for design and optimization of the casting process of VGI cylinder blocks. Cooling rates at different positions in the cylinder block were calculated based on the cooling curves recorded with a solidification simulation software. The metallographic structure and thermal conductivity were observed and measured using optical microscopy(OM), scanning electrical microscopy(SEM) and laser flash diffusivity apparatus, respectively. The effects of the cooling rate on the vermicularity, total and average areas of all graphite particles, and the pearlite fraction in the VGI cylinder block were investigated. It is found that the vermicularity changes in parabola trend with the increase of cooling rate. The total area of graphite particles and the cooling rate at eutectoid stage can be used to predict pearlite fraction well. Moreover, it is found that the thermal conductivity at room temperature is determined by the average area of graphite particles and pearlite fraction when the range of vermicularity is from 80% to 93%. Finally, the quantitative models are established to calculate the vermicularity, pearlite fraction, and thermal conductivity of the VGI cylinder block. 展开更多
关键词 vermicular graphite cast iron cylinder block quantitative model cooling rate thermal conductivity
Liquid Air Energy Storage for Decentralized Micro Energy Networks with Combined Cooling,Heating,Hot Water and Power Supply 认领
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作者 SHE Xiaohui ZHANG Tongtong +5 位作者 PENG Xiaodong WANG Li TONG Lige LUO Yimo ZHANG Xiaosong DING Yulong 《热科学学报:英文版》 SCIE EI CAS 2021年第1期1-17,共17页
Liquid air energy storage(LAES)has been regarded as a large-scale electrical storage technology.In this paper,we first investigate the performance of the current LAES(termed as a baseline LAES)over a far wider range o... Liquid air energy storage(LAES)has been regarded as a large-scale electrical storage technology.In this paper,we first investigate the performance of the current LAES(termed as a baseline LAES)over a far wider range of charging pressure(1 to 21 MPa).Our analyses show that the baseline LAES could achieve an electrical round trip efficiency(e RTE)above 60%at a high charging pressure of 19 MPa.The baseline LAES,however,produces a large amount of excess heat particularly at low charging pressures with the maximum occurred at~1 MPa.Hence,the performance of the baseline LAES,especially at low charging pressures,is underestimated by only considering electrical energy in all the previous research.The performance of the baseline LAES with excess heat is then evaluated which gives a high e RTE even at lower charging pressures;the local maximum of 62%is achieved at~4 MPa.As a result of the above,a hybrid LAES system is proposed to provide cooling,heating,hot water and power.To evaluate the performance of the hybrid LAES system,three performance indicators are considered:nominal-electrical round trip efficiency(ne RTE),primary energy savings and avoided carbon dioxide emissions.Our results show that the hybrid LAES can achieve a high ne RTE between 52%and 76%,with the maximum at~5 MPa.For a given size of hybrid LAES(1 MW×8 h),the primary energy savings and avoided carbon dioxide emissions are up to 12.1 MWh and 2.3 ton,respectively.These new findings suggest,for the first time,that small-scale LAES systems could be best operated at lower charging pressures and the technologies have a great potential for applications in local decentralized micro energy networks. 展开更多
关键词 liquid air energy storage cryogenic energy storage micro energy grids combined heating cooling and power supply heat pump
Recent Advances in Closed Loop Spray Cooling and its Application in Airborne Systems 认领
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作者 XU Xinjie WANG Yu +2 位作者 JIANG Yanlong LIU Jinxiang YUAN Xiaolei 《热科学学报:英文版》 SCIE EI CAS 2021年第1期32-50,共19页
In recent years,the problem of heat dissipation in airborne directed energy weapons has attracted considerable research interest.Spray cooling can be applied to cool airborne directed energy weapons,owing to its sever... In recent years,the problem of heat dissipation in airborne directed energy weapons has attracted considerable research interest.Spray cooling can be applied to cool airborne directed energy weapons,owing to its several advantages such as a large heat transfer coefficient,absence of boiling hysteresis and uniform surface temperature.To examine the potential of an airborne spray cooling system,the typical high heat flux dissipation methods were compared,and the state of the art research on spray cooling was reviewed.This review was focused on studies related to the spray cooling hydrodynamic mechanism,experimental studies of closed loop spray cooling,numerical simulation studies about spray cooling and the identification of the factors influencing spray cooling systems,and investigations related to the multiple nozzle spray cooling technology and heat transfer correlation predictions.Overall,there is a need for further research to investigate the failure phenomenon after the critical state,matching operation of the total system and microscopic characteristics of airborne specific parameters. 展开更多
关键词 spray cooling closed loop heat transfer performance influencing factor CORRELATIONS
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