检索结果-内蒙古大学图书馆

Angle Scattering Method for Soot Concentration Measurement under Ultra-Low Emissions Condition

Energy engineering 2022年第2期119卷 511-522页

作者： Bin Yang Xingchen Zhu Jie Deng Xiaoxu Guo Jinke Han Xiaowei Liu School of Energy and Power Engineering Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power EngineeringUniversity of Shanghai for Science and TechnologyShanghai200093China State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan430074China

Aiming at the problem of soot concentration measurement under ultra-low emission conditions,a forward small angle soot concentration measurement method is *** a typical boiler emission of 0.1μm-3.0μm bimodal distribution soot as an object,the particle scatter simulation calculation under different parameters is carried out,and the influence of detection angle and particle size on the angular scatteringmeasurement of ultra-low emission soot is *** influence of detection angle and particle size on the angular scatteringmeasurement of ultra-lowemission soot is ***,thewavelength of incident light is 650 nm,and the forward detection angle parameter is 15◦for the design of forward small angle soot concentration measurement *** experimental system for measuring soot with standard concentration is *** of particle concentration measurement of 1.0μm and 3.0μm under ultra-low emission conditions are carried *** results show that the average deviation of soot concentration measurement is less than 0.10 mg/m3 under the condition of ultra-low emission by using 15◦of forward detection,which provides an effective way for monitoring ultra-low emission soot concentration in coal-fired power plants.

关键词： Emission monitoring ultra-low emission soot concentration angular scattering

来源：评论

学校读者我要写书评

暂无评论

Investigation on the Transient Thermal Performance of a Mini-Channel Cold Plate for Battery Thermal Management

引用

Journal of Thermal Science 2021年第3期30卷 914-925页

作者： FANG Yidong SHEN Jiali ZHU Yue YE Fei LI Kang SU Lin School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai 200093China

Cold plate is an important component for a liquid battery thermal management *** order to study the transient thermal performance of the cold plate under conditions with sharply increasing heat loads,the numerical model of a battery cold plate is *** validation experiment shows that the error between the simulation and experiment is around 2.5%to 5%.Effects of the coolant flow rate,the increase in heat flux,and the channel number are analyzed to study the transient thermal performance of the cold *** show that the average temperature of the cold plate at 540 s is lowered from 28.3℃ to 26.9℃ when the coolant flow rate is raised from 0.065 kg/s to 0.165 kg/*** temperature deviation is decreased when the coolant flow rate is increased from 0.065 kg/s to 0.115 kg/s;however,it is slightly increased if the coolant flow rate is further *** average temperature and temperature deviation are raised if the final heat flux is increased from11000 W/m^(2) to 16500 W/m^(2),which are 2 and 3 times of the initial,*** addition,increasing the channel number has slightly positive effect on the average temperature of the cold plate,while the temperature deviation is increased when the channel number is increased from 3 to 11 due to the non-uniform velocity distribution between each *** results of this study will be helpful during the design of cold plate for battery thermal management,especially for transient conditions with sudden rising heat loads like thermal runaway.

关键词： battery thermal management cold plate transient analysis temperature distribution mini-channel

来源：评论

学校读者我要写书评

暂无评论

Dynamic Response of Offshore Wind Turbine on 3×3 Barge Array Floating Platform under Extreme Sea Conditions

引用

China Ocean engineering 2021年第2期35卷 186-200页

作者： LIU Qing-song MIAO Wei-pao YUE Min-nan LI Chun WANG Bo DING Qingwei School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai 200093China

Offshore wind farm construction is nowadays state of the art in the wind power generation ***,deep water areas with huge amount of wind energy require innovative floating platforms to arrange and install wind turbines in order to harness wind energy and generate *** conventional floating offshore wind turbine system is typically in the state of force imbalance due to the unique sway characteristics caused by the unfixed foundation and the high center of gravity of the ***,a floating wind farm for 3×3 barge array platforms with shared mooring system is presented here to increase stability for floating *** NREL 5 MW wind turbine and ITI Energy barge reference model is taken as a basis for this ***,the unsteady aerodynamic load solution model of the floating wind turbine is established considering the tip loss,hub loss and dynamic stall correction based on the blade element momentum(BEM)*** second development of AQWA is realized by FORTRAN programming language,and aerodynamic-hydrodynamic-Mooring coupled dynamics model is established to realize the algorithm solution of the ***,the 6 degrees of freedom(DOF)dynamic response of single barge platform and barge array under extreme sea condition considering the coupling effect of wind and wave were observed and investigated in *** research results validate the feasibility of establishing barge array floating wind farm,and provide theoretical basis for further research on new floating wind farm.

关键词： Barge floating platform extreme sea conditions dynamic response stability

来源：评论

学校读者我要写书评

暂无评论

Numerical and experimental investigation on boiling heat transfer and flow attributes for the exterior of smooth tubes and T-fin tubes

引用

APPLIED THERMAL engineering 2024年第PartB期248卷

作者： Li, Meng Tao, Leren Huang, Lihao Jin, Cheng Cheng, Jian Univ Shanghai Sci Technol Inst Refrigerat & Cryogen Shanghai 200093 Peoples R China Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer P Shanghai 200093 Peoples R China Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China

Experiments and numerical analyses of saturated pool boiling have been carried out on the outer surfaces of horizontal smooth tubes and T -fin tubes. Using a computational model that closely matches the experimental results, the study examined the dynamics of the bubbles as well as the boiling heat transfer coefficients in both the circumferential and axial orientations of the T -fin tubes. For the first time, comprehensive information on the process of high -performance external tube boiling has been made available. The findings demonstrate that an increase in fin density on the surface of the T -fin tubes leads to an abundance of bubble nuclei, with the escaping bubbles exhibiting both increased size and accelerated velocity. Due to the distinctive configuration of the T -fin tube, the local heat flow is lowest at the root fin and highest at the fin tip, indicating that heat transfer is inhibited in the narrow cavity between the two lateral fins. The optimal fin density, which corresponds to the maximum overall heat transfer coefficient has been identified. This states that the enhanced heat transfer mechanism within the T -fin tube is a symbiotic effect of both the increase in heat transfer area and the subsequent degradation of heat transfer fostered by the bubbling of the tube.

关键词： T -fin tube Fin density Pool boiling Bubble behaviors CFD

来源：评论

学校读者我要写书评

暂无评论

Research on the thermal properties and interface resistance of multilayer multiscale semiconductor structures

引用

THERMAL SCIENCE AND engineering PROGRESS 2024年 50卷

作者： Zhang, Mengya Liu, Yi Li, Ling Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer P Shanghai 200093 Peoples R China Southeast Univ Dept Mech Engn Jiangsu Key Lab Design & Manufacture Micronano Bio Nanjing 210096 Peoples R China

The investigation of the thermal characteristics of high-power chips is mainly based on Fourier's law, and it does not adequately explore the microscale effects of the heat transfer process. In pursuit of a more profound comprehension of the size-dependent traits manifesting in the thermal conduction across multilayer, multiscale materials, this manuscript incorporates the phonon transport's scattering mismatch attributes, introducing a MBDE methodology aimed at delineating the thermal characteristics inherent to multilayer, multiscale structures. This approach was applied to elucidate the energy transfer dynamics among bi-layer (Si/Si, Diamond/Si, and Cu/Si) configurations of differing scales. To enhance thermal transfer efficiency, this work prioritizes the minimization of interface thermal resistance and system temperature gradients as optimization objectives, employing a genetic algorithm to identify scales favorable for energy transfer. The results indicate: 1) An increase in the Knudsen number (Kn) correlates with a more pronounced energy discontinuity at the interface, thereby elevating the interface thermal resistance;2) The disparate material combinations exhibit varied energy transfer efficiencies, where the phononic compatibility between Cu/Si is inferior to that of Diamond/Si, culminating in a notably larger energy discontinuity and, consequently, augmented energy transfer losses for Cu/Si interfaces;3) Through the application of a genetic algorithm, it was determined that transitioning from Kn1 to Kn2 yields an optimal thermal conduction scenario, characterized by an interface thermal resistance of 1.83 and a comprehensive temperature gradient of 6.69. This work holds significant implications for guiding the thermal design of high-power integrated chips.

关键词： Multilayer ballistic diffusion method Multiscale heat transfer Interface characteristics heat transfer optimization Genetic Algorithm

来源：评论

学校读者我要写书评

暂无评论

Understanding the Impacts of Different Impurities on Elemental Mercury Removal by CaS in Chemical Looping Combustion of Coal: A First Principle Study

引用

ACS OMEGA 2023年第34期8卷 31468-31479页

作者： Fan, Yunpei Jin, Jing Liu, Qiuqi Xu, Kailong Shi, Huancong Liu, Dunyu Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer P Shanghai 200093 Peoples R China

CaSO4 has the advantages of abundant yield,high oxygen-carryingcapacity, low cost, and no heavy metal pollution, making it promisingas an oxygen carrier for chemical looping combustion (CLC). In comparisonwith other oxygen carriers, CaS as the reduced product of CaSO4 exhibits superior adsorption efficiency for Hg-0 in the flue gas. In this paper, density functional theory (DFT)was used to investigate the adsorption mechanism of Hg-0 on the adsorbent surface of CaS(001). The adsorption energies ofdifferent oxidized mercury species such as HgS, HgCl, and HgBr overthe CaS surface were summarized. Furthermore, the effects of variousflue gas components including SO2, H2S, S, HCl,Cl-2, CO, H-2, H2O, and C on Hg-0 adsorption over the CaS(001) surface were evaluated. Theresults show that Hg-0 can be adsorbed on the CaS(001) surfacein a chemisorption manner with a reaction energy of -65.1 kJ/*** adsorption energy of different forms of mercury on the CaS(001)surface varies greatly, and mercury in the oxidized state is moreeasily captured by CaS. SO2 inhibits while other flue gascomponents promote Hg-0 adsorption over the CaS ***, CaS tends to adsorb mercury in the reduction reactor andrelease mercury when CaS is re-oxidized to CaSO4 in theoxidation reactor. This is detrimental to mercury removal in the CLCof coal. This study sheds light on the migration and transformationof mercury in the CLC of coal with CaSO4 as the oxygencarrier.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Experimental and numerical investigation of rectifier designs for enhancing energy separation efficiency in vortex tubes

引用

APPLIED THERMAL engineering 2025年 272卷

作者： Hu, Zhuohuan Zheng, Xiaohua Gao, Fan Wu, Hongwei Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer P Shanghai 200093 Peoples R China Shanghai Univ Polit Sci & Law Shanghai Peoples R China Univ Hertfordshire Sch Phys Engn & Comp Sci Hatfield AL10 9AB England

In this article, a comprehensive experimental investigation was conducted on several rectifier-incorporated vortex tube to quantify key thermal performance metrics, including cold-end temperature difference, hot-end temperature difference, and coefficients of performance (COP), under the same operational conditions. Among the tested configurations, the vortex tube with a double-ring rectifier exhibited the highest energy separation efficiency, achieving a cold-end temperature difference up to 8.6 K higher than that of the prototype. Furthermore, this configuration attained the highest COP value of 0.104, representing a 43.2 % improvement over the prototype. A temperature-entropy analysis revealed that the rectifier effectively reduced irreversible losses during the energy separation process, thereby mitigating thermodynamic irreversibility associated with turbulent dissipation. Additionally, numerical simulations were performed on both the vortex tube prototype and the vortex tube with a double-ring rectifier. The numerical results demonstrated that the double-ring rectifier enhanced fluid rotational intensity and established distinct stratified flow regimes between the core and peripheral regions. Moreover, contour analysis identified a larger velocity gradient in the flow field near the rectifier, which disrupted the thermal boundary layer between the inner and peripheral fluid. This disruption facilitated greater heat transfer to both the peripheral fluid and the tube wall, thereby enhancing the vortex tube's energy separation performance. Overall, the combined experimental and numerical findings confirm that rectifier-induced flow field optimization significantly enhances vortex tube energy separation efficiency.

关键词： Vortex Tube Rectifier Energy Separation Coefficient of Performance Experimental

来源：评论

学校读者我要写书评

暂无评论

Revealing Interstitial Diffusion and Vacancy Diffusion Kinetics of Battery-like Electrodes for High-Performance Pseudocapacitors

引用

ACS APPLIED ENERGY MATERIALS 2023年第15期6卷 8288-8296页

作者： Yin, Baoyi Hao, Liang Li, Xiaogan Dalian Univ Technol Sch Microelect Dalian 116024 Liaoning Peoples R China Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer P Shanghai 200093 Peoples R China

Battery-type materials have been identified as highlypromisingelectrode materials for supercapacitors due to their high theoreticalcapacitance. However, their substantially lower practical capacitanceis due to their poor electrode kinetics, which severely restrict theusage of redox-active regions on the electrode surface. To addressthis issue, the oxygen-vacancy-abundant Co-MoO3-x microsphere structure is used as a representativeexample to explore the interstitial diffusion and vacancy diffusionkinetics by adjusting the internal crystal structure, ultimately achievingan accelerated H+ ion transport rate. First-principlessimulations show that the defect structure in Co-MoO3-x , which originates from Co 3d orbitals and is generatedclose to the Fermi level, can modulate the electronic states. Theprepared asymmetric supercapacitor device using Co-MoO3-x exhibits a very high specific capacitance of 167.7C/g at 1 A/g, a high energy density of 30.2 Wh/kg at a power densityof 865 W/kg, and an excellent capacitance retention of 82.1% after5000 cycles in H2SO4 electrolyte. This researchdemonstrates the potential for internal crystal structure adjustmentto enhance the performance of electrode materials, especially battery-likeelectrode materials, for high-performance supercapacitors.

关键词： interstitial diffusion vacancy diffusion battery-like electrode H+ ion transport rate supercapacitor

来源：评论

学校读者我要写书评

暂无评论

Modeling and thermodynamic analysis of gas-supercritical carbon dioxide combined cycle system

引用

ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS 2022年第4期44卷 9043-9063页

作者： Zhou, Jiayin Huang, Diangui Qi, Yinke Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai Peoples R China

Gas turbine power generation has the advantages of flexibility, efficiency, and lower carbon emissions compared with coal-fired power generation. Under the situation of energy structure transformation and upgrading, gas turbine power generation will have bright prospects. In this paper, the modeling and thermodynamic analysis of various gas-supercritical carbon dioxide(sCO(2)) combined cycle systems are carried out based on the calculation method of total physical properties, and six typical combined cycle layouts are selected for detailed research. In order to obtain the optimal state of the combined cycle system, the parameters of the sCO(2) bottom cycle are optimized within a certain range of the gas turbine pressure ratio. It is found that the combined cycle system has high thermal efficiency when the top cycle adopts the air preheating cycle, and a higher top cycle regenerative degree does not represent a better performance. In fact, the optimal regenerative degree is related to the bottom cycle performance. The study also found that the air preheating-dual heated cascade combined cycle system has the highest thermal efficiency of the layouts studied, reaching 65.3%, but it comes at the cost of a complex operating system. The heat recovery performance of the sCO(2) partial heating bottom cycle is relatively poor, and its mass flow rate is the highest, so it is not suitable for the bottom cycle of the combined cycle. The sCO(2) dual heated cascade cycle has the highest output work and the smallest CO2 flow, so this paper considers this bottom cycle as the most suitable bottom cycle for the combined cycle system. This research can provide a certain basis for the design of gas turbine combined cycle system.

关键词： Gas turbine waste heat recovery supercritical carbon dioxide cycle thermodynamic analysis

来源：评论

学校读者我要写书评

暂无评论

Effect of environmental parameters on heat transfer characteristics and thermal sensation of human body with step change of temperature

引用

heat AND MASS transfer 2022年第5期58卷 873-885页

作者： Qi, Liangkui Wu, Qingqing Zhang, Liang Liu, Jianhua Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 20093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China

Step change of thermal environment is often encountered in people's daily life. The purpose of this paper is to explore effects of temperature difference, wind speed and clothing thermal resistance on skin temperature, heat transfer characteristics and thermal comfort with step change of ambient temperature, and to find out relationship between human physiological parameters and subjective thermal evaluation. Thermal response experiment of 30 subjects under different temperature difference, wind speed and clothing thermal resistance were carried out in an artificial climate chamber to simulate step change of neutral-slightly hot/hot- neutral temperature. The results show that the larger the abrupt temperature difference, the larger the mean skin temperature increment, and the longer the time needs to reach stability. Thermal sensation appears "overshoot phenomenon" during step change, which is caused by step change of heat transfer between human body and environment. The increase of wind speed results in a decrease in skin temperature and thermal sensation after step change, but the effect was not significant. The greater the sudden temperature difference, the less significant the effect of wind speed. The increase of clothing thermal resistance results in a significant increase in skin temperature and thermal sensation after step change and the effect is significant. The greater the sudden temperature difference, the more significant the effect of clothing thermal resistance. Knothe function can quantify the regulation characteristics of mean skin temperature with time during temperature step change. There is a good linear correlation between thermal sensation and heat transfer on the skin surface, so heat transfer can be used to predict thermal sensation under step change condition. The regression coefficients are affected by wind speed and clothing thermal resistance.

关键词： heat resistance

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：