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《环境科学与工程前沿(英文)》 2022年 第16卷 第6期 doi: 10.1007/s11783-021-1506-3
• The early corrosion process in the cast iron pipes was investigated.
关键词: Cast iron pipe corrosion Drinking water distribution systems Chlorine disinfection Iron-oxidizing bacteria Coupling effects
Hanlong LIU, Xuanming DING
《结构与土木工程前沿(英文)》 2009年 第3卷 第2期 页码 240-240 doi: 10.1007/s11709-009-0100-8
陈智斌,余永权,杨少敏
《中国工程科学》 2005年 第7卷 第3期 页码 84-89
根据石墨的形态特征,运用物元分析方法建立起关于石墨形态识别的物元模型,提出了可拓分类树方法,讨论了可拓分类树的构造和实现途径,并将其应用于石墨形态的类型判别;给出了典型的实验结果,并对该方法与现有识别方法作出比较。
袁望姣,何将三
《中国工程科学》 2005年 第7卷 第9期 页码 56-60
炼锌工业中广泛使用由无缝钢管冷弯而成的冷却管来实现锌液的冷却。冷却管的使用寿命非常短,消耗量相当大。锌液的表面张力小,渗透性强,腐蚀性强,能与冷却管中的铁元素生成铁-锌合金,能溶解冷却管中碳、硅等元素,锌液对冷却管的强腐蚀性,是影响锌液冷却管使用寿命的决定性因素;锌液冷却管的损坏是高温腐蚀和应力腐蚀共同作用的结果,热应力和残余应力促使其损坏由高温腐蚀向应力腐蚀发展;冷却管损坏位置由热应力和残余应力共同决定,其中热应力起主导作用。
Premature melt solidification during mold filling and its influence on the as-cast structure
M. WU, M. AHMADEIN, A. LUDWIG
《机械工程前沿(英文)》 2018年 第13卷 第1期 页码 53-65 doi: 10.1007/s11465-017-0437-y
Premature melt solidification is the solidification of a melt during mold filling. In this study, a numerical model is used to analyze the influence of the pouring process on the premature solidification. The numerical model considers three phases, namely, air, melt, and equiaxed crystals. The crystals are assumed to have originated from the heterogeneous nucleation in the undercooled melt resulting from the first contact of the melt with the cold mold during pouring. The transport of the crystals by the melt flow, in accordance with the so-called “big bang” theory, is considered. The crystals are assumed globular in morphology and capable of growing according to the local constitutional undercooling. These crystals can also be remelted by mixing with the superheated melt. As the modeling results, the evolutionary trends of the number density of the crystals and the volume fraction of the solid crystals in the melt during pouring are presented. The calculated number density of the crystals and the volume fraction of the solid crystals in the melt at the end of pouring are used as the initial conditions for the subsequent solidification simulation of the evolution of the as-cast structure. A five-phase volume-average model for mixed columnar-equiaxed solidification is used for the solidification simulation. An improved agreement between the simulation and experimental results is achieved by considering the effect of premature melt solidification during mold filling. Finally, the influences of pouring parameters, namely, pouring temperature, initial mold temperature, and pouring rate, on the premature melt solidification are discussed.
关键词: premature solidification mold filling as-cast structure modeling
Major applications of heat pipe and its advances coupled with sorption system: a review
Yang YU, Guoliang AN, Liwei WANG
《能源前沿(英文)》 2019年 第13卷 第1期 页码 172-184 doi: 10.1007/s11708-019-0610-6
关键词: heat pipe sorption system heat transfer solid sorption heat pipe
On corrosion to stainless steel by calcium chloride with different extender
Lv XU, Yuanyang HU, Liwei WANG, Ruzhu WANG,
《能源前沿(英文)》 2010年 第4卷 第2期 页码 181-184 doi: 10.1007/s11708-009-0065-2
关键词: stainless steel corrosion calcium chloride expanded graphite activated carbon oxidation creation pitting corrosion
Design and analyses of open-ended pipe piles in cohesionless soils
Yuan GUO,Xiong (Bill) YU
《结构与土木工程前沿(英文)》 2016年 第10卷 第1期 页码 22-29 doi: 10.1007/s11709-016-0314-5
Group-based multiple pipe routing method for aero-engine focusing on parallel layout
《机械工程前沿(英文)》 2021年 第16卷 第4期 页码 798-813 doi: 10.1007/s11465-021-0645-3
关键词: multiple pipe routing optimization algorithm aero-engine pipe grouping parallel layout
Monitoring corrosion of reinforcement in concrete structures via fiber Bragg grating sensors
Zhupeng ZHENG, Xiaoning SUN, Ying LEI
《机械工程前沿(英文)》 2009年 第4卷 第3期 页码 316-319 doi: 10.1007/s11465-009-0040-y
关键词: fiber Bragg grating (FBG) corrosion concrete structures accelerated corrosion test
Corrosion mechanisms of candidate structural materials for supercritical water-cooled reactor
Lefu ZHANG, Fawen ZHU, Rui TANG
《能源前沿(英文)》 2009年 第3卷 第2期 页码 233-240 doi: 10.1007/s11708-009-0024-y
关键词: supercritical water-cooled reactor general corrosion oxide film corrosion mechanism
Wenjin Ding, Alexander Bonk, Thomas Bauer
《化学科学与工程前沿(英文)》 2018年 第12卷 第3期 页码 564-576 doi: 10.1007/s11705-018-1720-0
Recently, more and more attention is paid on applications of molten chlorides in concentrated solar power (CSP) plants as high-temperature thermal energy storage (TES) and heat transfer fluid (HTF) materials due to their high thermal stability limits and low prices, compared to the commercial TES/HTF materials in CSP-nitrate salt mixtures. A higher TES/HTF operating temperature leads to higher efficiency of thermal to electrical energy conversion of the power block in CSP, however causes additional challenges, particularly increased corrosiveness of metallic alloys used as containers and structural materials. Thus, it is essential to study corrosion behaviors and mechanisms of metallic alloys in molten chlorides at operating temperatures (500–800 °C) for realizing the commercial application of molten chlorides in CSP. The results of studies on hot corrosion of metallic alloys in molten chlorides are reviewed to understand their corrosion behaviors and mechanisms under various conditions (e.g., temperature, atmosphere). Emphasis has also been given on salt purification to reduce corrosive impurities in molten chlorides and development of electrochemical techniques to in-situ monitor corrosive impurities in molten chlorides, in order to efficiently control corrosion rates of metallic alloys in molten chlorides to meet the requirements of industrial applications.
关键词: corrosion mechanisms impurities metallic corrosion salt purification electrochemical techniques
A review of nondestructive examination technology for polyethylene pipe in nuclear power plant
Jinyang ZHENG, Yue ZHANG, Dongsheng HOU, Yinkang QIN, Weican GUO, Chuck ZHANG, Jianfeng SHI
《机械工程前沿(英文)》 2018年 第13卷 第4期 页码 535-545 doi: 10.1007/s11465-018-0515-9
Polyethylene (PE) pipe, particularly high-density polyethylene (HDPE) pipe, has been successfully utilized to transport cooling water for both non-safety- and safety-related applications in nuclear power plant (NPP). Though ASME Code Case N755, which is the first code case related to NPP HDPE pipe, requires a thorough nondestructive examination (NDE) of HDPE joints. However, no executable regulations presently exist because of the lack of a feasible NDE technique for HDPE pipe in NPP. This work presents a review of current developments in NDE technology for both HDPE pipe in NPP with a diameter of less than 400 mm and that of a larger size. For the former category, phased array ultrasonic technique is proven effective for inspecting typical defects in HDPE pipe, and is thus used in Chinese national standards GB/T 29460 and GB/T 29461. A defect-recognition technique is developed based on pattern recognition, and a safety assessment principle is summa-rized from the database of destructive testing. On the other hand, recent research and practical studies reveal that in current ultrasonic-inspection technology, the absence of effective ultrasonic inspection for large size was lack of consideration of the viscoelasticity effect of PE on acoustic wave propagation in current ultrasonic inspection techno-logy. Furthermore, main technical problems were analyzed in the paper to achieve an effective ultrasonic test method in accordance to the safety and efficiency requirements of related regulations and standards. Finally, the development trend and challenges of NDE test technology for HDPE in NPP are discussed.
关键词: polyethylene pipe nuclear power plant ultrasonic inspection nondestructive testing safety assessment
马秀敏,朱桂雨,路东柱,段继周,侯保荣
《中国工程科学》 2022年 第24卷 第1期 页码 190-197 doi: 10.15302/J-SSCAE-2022.01.020
腐蚀管理关乎安全生产,关乎国民经济,关乎生态文明,关乎资源节约和国家建设。虽然少数行业在腐蚀管理方面已经进行了一些卓有成效的探索和实践,但是总体上腐蚀管理在我国发展十分不平衡,存在着腐蚀管理意识薄弱、专业人才短缺和管理系统不健全等问题。因此,有必要进一步明确腐蚀管理的内涵,明确我国腐蚀管理体系化发展的基本要求,推动腐蚀管理体系化持续健康发展。本文基于中国工程院重点咨询项目“我国腐蚀管理状况与对策战略研究”主要研究成果,阐述了腐蚀管理的内涵及体系化发展的重要意义,分析了我国腐蚀管理的现状及问题,总结提出了腐蚀管理体系基本框架及管理要点,提出了将腐蚀管理纳入国家安全战略,成立腐蚀管理战略研究常设机构;加强腐蚀学科建设,强化人才战略;建立健全腐蚀防护相关法规标准,强化标准意识;加强腐蚀数据库建设,畅通沟通渠道;搭建腐蚀管理信息及大数据交流平台,打造共享管理新模式等对策建议。
Abbas TEIMOURI, Nasrin SOLTANI, Alireza Najafi CHERMAHINI
《化学科学与工程前沿(英文)》 2011年 第5卷 第1期 页码 43-50 doi: 10.1007/s11705-010-0532-7
关键词: corrosion inhibitors mild steel acidic medium theoretical studies DFT
标题 作者 时间 类型 操作
Synergistic effects of sodium hypochlorite disinfection and iron-oxidizing bacteria on early corrosionin cast iron pipes
期刊论文
Propagation characteristics of transient waves in low-strain integrity testing on cast-in-situ concretethin-wall pipe piles
Hanlong LIU, Xuanming DING
期刊论文
Premature melt solidification during mold filling and its influence on the as-cast structure
M. WU, M. AHMADEIN, A. LUDWIG
期刊论文
Major applications of heat pipe and its advances coupled with sorption system: a review
Yang YU, Guoliang AN, Liwei WANG
期刊论文
On corrosion to stainless steel by calcium chloride with different extender
Lv XU, Yuanyang HU, Liwei WANG, Ruzhu WANG,
期刊论文
Monitoring corrosion of reinforcement in concrete structures via fiber Bragg grating sensors
Zhupeng ZHENG, Xiaoning SUN, Ying LEI
期刊论文
Corrosion mechanisms of candidate structural materials for supercritical water-cooled reactor
Lefu ZHANG, Fawen ZHU, Rui TANG
期刊论文
Corrosion behavior of metallic alloys in molten chloride salts for thermal energy storage in concentrated
Wenjin Ding, Alexander Bonk, Thomas Bauer
期刊论文
A review of nondestructive examination technology for polyethylene pipe in nuclear power plant
Jinyang ZHENG, Yue ZHANG, Dongsheng HOU, Yinkang QIN, Weican GUO, Chuck ZHANG, Jianfeng SHI
期刊论文