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15th Triennial International Conference on Liquid Atomization and Spray Systems, ICLASS 2021

作者： Zhou, Zhifu Ji, Renjie Chen, Bin Thrassos, Panidis State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Laboratory of Applied Thermodynamics Mechanical Engineering Aeronautics Department University of Patras Rio Patras26504 Greece

The rapid development in performance, integration and miniaturization of electronics and other high power devices cause huge heat flux values. However, transitional cooling methods can hardly meet the requirement of dissipating effectively the high heat flux at the normal working temperature (usually smaller than 75 oC). The refrigerants flash evaporation spray cooling with phase change has been considered as one of the most promising technologies of heat dissipation for electronic devices and other high power devices due to its high heat removal capability at relatively low surface temperature, cooling uniformity, non-corrosivity. This study presents an experimental study on the heat transfer performance of the close-loop R410A flashing spray cooling, mainly focusing on the influence of macro-fin structure of cooling surface. The flat, square fin, pyramid fin surfaces and a newly designed tetrahedral fin surface are systematically examined. The results indicate that the newly designed tetrahedral fin surface has superior cooling performance than other fin surfaces. © 2021 ICLASS 2021 - 15th Triennial International Conference on Liquid Atomization and Spray Systems. All Rights Reserved.

关键词： Electronic cooling

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Local flow Regime Transition Criteria of Gas-Liquid Two-phase flow in Vertical Upward Tube with a Horizontal Rod

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Chinese Journal of Chemical engineering 2006年第4X期14卷 442-449页

作者：胡志华杨燕华刘磊周芳德 School of Mechanical Engineering Shanghai Jiaotong University Shanghai 200030 China State Key Laboratory of Multiphase Flow in Power Engineering Xi＇an Jiaotong Univeristy Xi＇an 710049 China

The upward multiphase cross flow and heat transfer in the vertical tube may occur in oil production and chemical facilities. In this study, the local flow patterns of an upward gas-water two phase cross flow in a vertical tube with a horizontal rod have been investigated with an optical probe and the digital high speed video system. The local flow patterns are defined as the bubble, slug, churn and annular flow patterns. Optical probe signals are ana- lyzed in terms of probability density function, and it is proved that the local flow patterns can be recognized by this method. The transition mechanisms between the different flow patterns have been analyzed and the corresponding transitional models are proposed. Finally, local flow pattern maps of the upward gas-water two-phase flow in the vertical tube with a horizontal rod are constructed.

关键词： gas-liquid two-phase cross flow local flow pattern transition

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Progress and key challenges in catalytic combustion of lean methane

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Journal of Energy Chemistry 2022年第12期75卷 173-215,I0005页

作者： Xiangbo Feng Lei Jiang Danyang Li Shaopeng Tian Xing Zhu Hua Wang Chi He Kongzhai Li Xi’an Key Laboratory of Advanced Photoelectronics Materials and Energy Conversion Device School of ScienceXijing UniversityXi’an 710123ShaanxiChina State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093YunnanChina Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093YunnanChina State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049ShaanxiChina National Engineering Laboratory for VOCs Pollution Control Material&Technology University of Chinese Academy of SciencesBeijing 101408China

As a primary type of clean energy,methane is also the second most important greenhouse gas after CO_(2)due to the high global warming *** quantities of lean methane(0.1–1.0 vol%)are emitted into the atmosphere without any treatment during coal mine,oil,and natural gas production,thus leading to energy loss and greenhouse *** general,it is challenging to utilize lean methane due to its low concentration and flow instability,while catalytic combustion is a vital pathway to realize an efficient utilization of lean methane owing to the reduced emissions of polluting gases(e.g.,NOxand CO)during the *** particular,to efficiently convert lean methane,it necessitates both the designs of highly active and stable heterogeneous catalysts that accelerate lean methane combustion at low temperatures and smart reactors that enable autothermal operation by optimizing heat *** this review,we discuss the in-depth development,challenges,and prospects of catalytic lean methane combustion technology in various configurations,with particular emphasis on heat management from the point of view of material design combined with reactor *** target is to describe a framework that can correlate the guiding principles among catalyst design,device innovation and system optimization,inspiring the development of groundbreaking combustion technology for the efficient utilization of lean methane.

关键词： Lean methane combustion Catalyst design Heat management Reactor optimization Catalytic mechanism

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Optimization of thermal spray parameters of nial/cr2c3 coating by taguchi method

Optimization of thermal spray parameters of nial/cr2c3 coati...

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Asia Conference on Material and Manufacturing Technology, ACMMT 2018

作者： Tahari, M. Luo, B. Geng, J. Jing, D. Hatami, M. EsfarayenNorth Khorasan Iran International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

ISBN: (纸本)9783035714050

In this study the effect of thermal spray process on wear resistance of NiAl/Cr2C3 thermal spray coating has been investigated. For this purpose the NiAl power mixed with 10 %wt. Cr2C3 powder and milled for 1 hrs at argon atmosphere. The APS parameters such as voltage (V), current(A), spray distance (mm), powder feed rate (gr/min), were optimize using a response surface methodology. For investigation effect of spray parameters on quality of coatings, the porosity and wear resistance of coatings analyzed with SEM and pin on disk wear test. Results show that increase of voltage and current are more effective other parameters. Increasing of powder feed rate and spray distance raised porosity of coatings intensively. © 2019 Trans Tech Publications Ltd, Switzerland.

关键词： Taguchi methods

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A comparison of low-pressure premixed laminar flames of 1,3-butadiene and 1,3-butadiene/acetylene with synchrotron radiation 7

A comparison of low-pressure premixed laminar flames of 1,3-...

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7th Asia-Pacific Conference on Combustion, ASPACC 2009

作者： Wei, L.X. Wu, X.S. Chen, Z.Y. Huang, Z.H. Yuan, T. Li, Y.Y. Tian, Z.Y. State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei230029 China

Low-pressure premixed laminar flames of 1,3-butadiene/oxygen /argon and 1,3-butadiene+acetylene/oxygen/argon have been investigated with tunable synchrotron photoionization and molecular beam mass spectrometry. Flame species, including not only isomeric intermediates, but also those with same molecular weight while different formulae, are identified by measuring the ionization energies. Mole fraction profiles of the main species are derived from the measured signal intensities at different flame positions. Comparison between the two flames reveals that the existence of excessive acetylene in 1,3-butadiene flame can not lead to an obvious increase of aromatics formation under the condition investigated. © 2009 Combustion Institute. All rights reserved.

关键词： Acetylene

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Research on the hydraulic characteristics of a 600MW supercritical pressure CFB boiler

Research on the hydraulic characteristics of a 600MW supercr...

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20th International Conference on Fluidized Bed Combustion

作者： Yang, D. Pan, J. Bi, Q.C. Zhang, Y.J. Jiang, X.G. Yu, L. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Harbin Boiler Co. Ltd. Harbin 150046 China

Water wall design is a key technology of supercritical pressure CFB boiler. On account of the low heat flux and its homogeneous distribution in furnace, internally ribbed tubes with low mass flux and smooth tubes with moderate mass flux can be applied in the water wall of supercritical CFB boilers. An experimental research on the flow and heat transfer characteristics of internally ribbed tubes and smooth tubes with different inner diameters was conducted in the range of sub-critical and supercritical pressure. The departure from nucleate boiling (DNB) and dry-out boundary and the empirical correlations of heat transfer are obtained from the experiments. The mathematical model for predicting the circuit mass flux and grid pressure of a flow network system is based on the mass and momentum conservation equations and an iterative method is used to solve the nonlinear equations. Harbin Boiler Works has developed a 600MW supercritical CFB boiler with external heat exchangers and 6 separators. The mass flux and metal temperature distribution of water wall in the CFB boiler are calculated and the results show that the water wall can operate safely at BMCR and 75%BMCR load.

关键词： Nonlinear equations

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Phase engineering of Nanomaterials: Metal Nanomaterials

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Chemical Research in Chinese Universities 2025年 1-44页

作者： Chen, Ye Liu, Jiawei Yun, Qinbai Cheng, Hongfei Cui, Xiaoya Fan, Zhanxi Fu, Lei Gao, Chuanbo Ge, Jingjie Ge, Yiyao Guo, Shaojun Han, Sumei Hong, Xun Huang, Bolong Huang, Hongwen Huang, Xiaoqing Liao, Xiaozhou Ling, Chongyi Liu, Dong Lu, Yang Lu, Qipeng Niu, Wenxin Saleem, Faisal Shao, Minhua Shao, Qi Shi, Zhenyu Song, Li Sun, Shouheng Tilley, Richard D. Wang, Deli Wang, An-Liang Wang, Jinlan Xi, Pinxian Xia, Younan Xiong, Yujie Yang, Nailiang Yin, Pengfei Yu, Yifu Zhang, Zhicheng Zhou, Meng Zhu, Ye Zhang, Hua Department of Chemistry The Chinese University of Hong Kong Shatin New Territories 999077 Hong Kong Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM) City University of Hong Kong 999077 Hong Kong Department of Chemical and Biological Engineering & Energy Institute The Hong Kong University of Science and Technology 999077 Hong Kong Shanghai Key Laboratory for R & D and Application of Metallic Functional Materials Institute of New Energy for Vehicles School of Materials Science and Engineering Tongji University Shanghai 201804 China Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources School of Materials Science and Technology China University of Geosciences Beijing 100083 China Hebei Key Laboratory of Resource Low-carbon Utilization and New Materials China University of Geosciences Beijing 100083 China Department of Chemistry City University of Hong Kong 999077 Hong Kong Hong Kong Institute for Clean Energy City University of Hong Kong Kowloon 999077 Hong Kong City University of Hong Kong Shenzhen Research Institute Shenzhen 518057 China College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China The Institute for Advanced Studies Wuhan University Wuhan 430072 China Sate Key Laboratory of Multiphase Flow in Power Engineering Frontier Institute of Science and Technology Xi’an Jiaotong University Xi’an 710049 China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hung Hom Kowloon 999077 Hong Kong State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China School of Materials Science and Engineering Peking University Beijing 100871 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Center of Advanced Nanocatalysis (CAN) Department of Applied Chemistry Univers

Phase is a fundamental structural parameter that distinguishes the atomic arrangement in materials. The recent advancement in phase engineering of nanomaterials (PEN) has witnessed the discovery and intriguing physicochemical properties of a number of unconventional phases in metal nanomaterials, enabling their promising applications in catalysis, optics, and so on. With the aid of advanced characterization techniques and theoretical calculations, phase engineering of metal nanomaterials has made significant progress in terms of precisely controlled synthesis, phase transformation, and phase-dependent property studies. This review summarizes the recent progress of PEN with a focus on metal nanomaterials. First, we introduce various synthetic strategies to prepare unconventional-phase metal nanomaterials, including monometallic and multimetallic nanomaterials. Second, we discuss methods to realize phase transformation of metallic nanomaterials. Then, we demonstrate various phase-dependent properties and applications of metal nanomaterials. Last, current challenges and exciting opportunities in the phase engineering of metal nanomaterials are discussed. © Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH 2025.

关键词： Metal nanomaterial Nanocatalysis Phase engineering of nanomaterial Phase-dependent property Unconventional-phase nanomaterial

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Optimization of the fuel rod＇s arrangement cooled by turbulentnanofluids flow in pressurized water reactor (PWR)

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Chinese Journal of Chemical engineering 2017年第6期25卷 722-731页

作者： M. Hatami MJ.Z. Ganfi I. Sohrabiasl D. Jing International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'anJiaotong University Xi'an 710049 China Department of Mechanical Engineering Esfarayen University of Technology Esfarayen North Khorasan lran Department of Renewable Energies Engineering Faculty of New Sdences & Technologies University of Tehran Tehran lran Department of Mechanical Engineering Babol University of Technology Babol lran

In this paper, response surface methodology(RSM) based on central composite design(CCD) is applied to obtain an optimization design for the fuel rod's diameter and distance cooled by turbulent Al_2O_3–water nanofluid for a typical pressurized water reactor(PWR). Fuel rods and nanofluid flow between them are simulated 3D using computational fluid dynamics(CFD) by ANSYS-FLUNET package software. The RNG k–ε model is used to simulate turbulent nanofluid flow between the rods. The effect of different nanoparticles concentration is also investigated on the Nusselt number from heat transfer efficiency view point. Results reveal that when distance parameter(a) is in the minimum level and diameter parameter(r) is in the maximum possible level, cooling the rods will be better due to higher Nusselt number in this situation. Also, using the different nanoparticles on the cooling process confirms that Al_2O_3 averagely 17% and TiO_2 10% improve the Nusselt numbers.

关键词： Optimization Fuel rods Nanofluid Pressurized water reactor

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Possible consumption pathways of 2,5-dimethylfuran in low-pressure premixed laminar flames 7

Possible consumption pathways of 2,5-dimethylfuran in low-pr...

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7th Asia-Pacific Conference on Combustion, ASPACC 2009

作者： Wu, X.S. Wei, L.X. Huang, Z.H. Yuan, T. Zhang, K.W. State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei230029 China

Low-pressure (4.0 kPa) premixed laminar 2,5-dimethylfuran (DMF)/oxygen/argon flame with an equivalence ratio (ø) of 2.0 was studied with tunable vacuum ultraviolet synchrotron radiation photoionization and molecular-beam mass spectrometry. Photoionization mass spectrum of DMF/O2/Ar flame was recorded and the photoionization efficiency curves (PIEs) of the combustion intermediates were measured. Flame species, including isomeric intermediates, are identified by comparing the measured ionization energies with those reported in literatures or those calculated with Gaussian-03W procedure. More than 70 species have been detected, including furan and its derivatives, aromatics, free radicals, and so on. Possible reaction pathways of DMF are proposed based on the intermediates identified. DMF can be consumed by H-abstraction and pyrolysis reactions. © 2009 Combustion Institute. All rights reserved.

关键词： Free radicals

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Effects of hydrogen addition on spherically expanding n-butane flames

Effects of hydrogen addition on spherically expanding n-buta...

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Fall Meeting of the Eastern states Section of the Combustion Institute 2009

作者： Tang, Chenglong Li, Yuyang Huang, Zuohua Law, C.K. State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an710049 China Department of Mechanical and Aerospace Engineering Princeton University PrincetonNJ08544 United States

ISBN: (纸本)9781615676682

Laminar flame speeds of hydrogen blended n-butane flames at atmospheric pressure and room temperature was measured in a combustion vessel with Schlieren photography, and determined using nonlinear regression analysis. According to the hydrogen addition parameter (RH) and effective equivalence ratio (φF) defined by Yu et al (1986), laminar flame speeds (Suo) for φF between 0.6 and 1.4 were found to increase linearly with RH from 0 to 0.5, with the slope of the variation assuming a minimum around stoichiometry. These experimental results correlate well with computed laminar flame speeds using the detailed reaction mechanism, USC Mech II. Furthermore, the adiabatic flame temperature was found to also increase monotonously with RH at specific φF, with the extent of the increase being the smallest around stoichiometry. It is therefore suggested that the effect of hydrogen addition on the laminar flame speeds of n-butane flames can be satisfactorily correlated with the response of the corresponding adiabatic flame temperature.

关键词： Stoichiometry

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