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Influence of temperature on cam-tappet lubrication in an internal combustion engine

CHANG Qiuying, YANG Peiran, WANG Jing, CHEN Quanshi

《机械工程前沿（英文）》 2007年 第2卷 第4期   页码 489-492 doi: 10.1007/s11465-007-0085-8

摘要： The transient thermo-elastohydrodynamic (TEHL) lubrication simulation and isothermal elastohydrodynamic (EHL) simulation were performed on the exhausting cam-tappet friction pair of an internal combustion engine. Although by employing the two models the center pressure, the thickness of the lubricant film and friction coefficient obtained were similar in the changing trend during a rotating cycle, the parameters make a great difference, especially for the thickness of the lubricant film; the TEHL was four times thicker than the EHL. These results show that the temperature should not be neglected in the study of the lubrication of cam-tappet pairs.

关键词： coefficient     combustion     isothermal elastohydrodynamic     temperature     thickness    

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A measurement system for thin elastohydrodynamic lubrication films

WANG Xuefeng, GUO Feng, YANG Peiran

《机械工程前沿（英文）》 2007年 第2卷 第2期   页码 193-196 doi: 10.1007/s11465-007-0032-8

摘要： An elastohydrodynamic lubrication (EHL) film measurement system using multi-beam interferometry is introduced in this paper. The measurement principle and the instrumentation are discussed. A simple and efficient method is suggested to obtain the fringe order of measured points. It is demonstrated that the presented measurement system can provide continuous measurement of lubricating films from nano to micro scales at a nano-level resolution, and can be used to investigate ultra-thin EHL films and tiny variations in EHL films.

关键词： instrumentation     continuous measurement     elastohydrodynamic lubrication     ultra-thin     measurement    

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A fast compound direct iterative algorithm for solving transient line contact elastohydrodynamic lubrication

null

《机械工程前沿（英文）》 2014年 第9卷 第2期   页码 156-167 doi: 10.1007/s11465-014-0297-7

摘要：

A fast compound direct iterative algorithm for solving transient line contact elastohydrodynamic lubrication (EHL) problems is presented. First, by introducing a special matrix splitting iteration method into the traditional compound direct iterative method, the full matrices for the linear systems of equations are transformed into sparse banded ones with any half-bandwidth; then, an extended Thomas method which can solve banded linear systems with any half-bandwidth is derived to accelerate the computing speed. Through the above two steps, the computational complexity of each iteration is reduced approximately from O(N3/3) to O(β2N), where N is the total number of nodes, and β is the half-bandwidth. Two kinds of numerical results of transient EHL line contact problems under sinusoidal excitation or pure normal approach process are obtained. The results demonstrate that the new algorithm increases computing speed several times more than the traditional compound direct iterative method with the same numerical precision. Also the results show that the new algorithm can get the best computing speed and robustness when the ratio, half-bandwidth to total number of nodes, is about 7.5%–10.0% in moderate load cases.

关键词： elastohydrodynamic lubrication     transient     line contact     matrix splitting iteration method     the Thomas method    

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A conceptual methodology for simultaneous optimization of water and heat with non-isothermal mixing

Yanlong Hou, Wanni Xie, Zhenya Duan, Jingtao Wang

《化学科学与工程前沿（英文）》 2017年 第11卷 第2期   页码 154-165 doi: 10.1007/s11705-016-1593-z

摘要： A new conceptual methodology is proposed to simultaneously integrate water allocation and energy networks with non-isothermal mixing. This method employs a simultaneous model and includes two design steps. In the first step, the water allocation network (WAN), which could achieve the targets of saving water and energy, is obtained by taking account the temperature factor into the design procedure. The optimized targets of both freshwater and energy are reached at this step which ensures this approach is a simultaneous one. In the second step, based on the obtained WAN, the whole water allocation and heat exchange network (WAHEN) is combined with the non-isothermal mixing to reduce the number of heat exchangers. The thus obtained WAHEN can achieve three optimization targets (minimization of water, energy and the number of heat exchangers). Furthermore, the effectivity of our method has been demonstrated by solving two literature examples.

关键词： simultaneous integration     non-isothermal mixing     multi-target optimization     water and energy networks    

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木粉/聚丙烯复合材料的非等温结晶动力学分析

黄浪,王海刚,王清文

《中国工程科学》 2014年 第16卷 第4期   页码 21-24

摘要：

通过共混造粒热压方法制备聚丙烯（PP）基木塑复合材料（WPC），用差示扫描量热法研究其非等温结晶行为，分别用Jeziorny 法和Mo法对所得的数据进行处理分析。结果表明：Jeziorny 法和Mo法能较理想地处理PP 基WPC的非等温结晶过程，复合材料中木粉的加入缩短了结晶时间，提高了PP 的结晶温度，降低了结晶速率。

关键词： PP     WPC     非等温结晶     结晶动力学    

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Effect of Joule heating on electro-osmotic flow in a closed-end micro-channel with isothermal and convective

Liang ZHAO, Linhua LIU,

《能源前沿（英文）》 2009年 第3卷 第4期   页码 381-388 doi: 10.1007/s11708-009-0057-2

摘要： The effect of Joule heating on the steady state electro-osmotic flow in a closed-end micro-channel is studied through numerical simulation with the finite volume method. The velocity field and the temperature field are described by a rigorous mathematical model. Thermophysical properties including viscosity and thermal conductivity are considered to be temperature-dependent. The simulations show that the presence of Joule heating causes an increase in temperature and a decrease in viscosity in the whole micro-channel, which, thereafter, induce a large velocity near the wall and an increase in fluid velocity at the central region in order to maintain a zero flow rate at the cross section of the micro-channel. The effect of Joule heating on the induced pressure gradient is also studied, which is very important for the application of the closed-end micro-channel as a micro-actuator. The results reveal that the induced pressure gradient, taking into consideration Joule heating, is significantly smaller than that without considering Joule heating when the wall temperature of the micro-channel is constant. The induced pressure gradient difference between considering Joule heating and without considering Joule heating is small under the convective boundary condition.

关键词： closed-end micro-channel     electrical double layer     electro-osmotic flow     induced pressure gradient     Joule heating    

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Robust optimization of the billet for isothermal local loading transitional region of a Ti-alloy rib-web

Ke WEI, Xiaoguang FAN, Mei ZHAN, Miao MENG

《机械工程前沿（英文）》 2018年 第13卷 第3期   页码 376-384 doi: 10.1007/s11465-018-0500-3

摘要：

Billet optimization can greatly improve the forming quality of the transitional region in the isothermal local loading forming (ILLF) of large-scale Ti-alloy rib-web components. However, the final quality of the transitional region may be deteriorated by uncontrollable factors, such as the manufacturing tolerance of the preforming billet, fluctuation of the stroke length, and friction factor. Thus, a dual-response surface method (RSM)-based robust optimization of the billet was proposed to address the uncontrollable factors in transitional region of the ILLF. Given that the die underfilling and folding defect are two key factors that influence the forming quality of the transitional region, minimizing the mean and standard deviation of the die underfilling rate and avoiding folding defect were defined as the objective function and constraint condition in robust optimization. Then, the cross array design was constructed, a dual-RSM model was established for the mean and standard deviation of the die underfilling rate by considering the size parameters of the billet and uncontrollable factors. Subsequently, an optimum solution was derived to achieve the robust optimization of the billet. A case study on robust optimization was conducted. Good results were attained for improving the die filling and avoiding folding defect, suggesting that the robust optimization of the billet in the transitional region of the ILLF was efficient and reliable.

关键词： isothermal local loading forming     rib-web component     transitional region     robust optimization     dual response surface method    

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The dehydration behavior and non-isothermal dehydration kinetics of donepezil hydrochloride monohydrate

Tiantian LIU, Yuanyuan RAN, Bochao WANG, Weibing DONG, Songgu WU, Junbo GONG

《化学科学与工程前沿（英文）》 2014年 第8卷 第1期   页码 55-63 doi: 10.1007/s11705-013-1352-3

摘要： Powders of donepezil hydrochloride monohydrate (Form I) underwent isomorphic dehydration, losing 3% w/w water between 90% and 10% relative humidity (RH) without changing its powder X-ray pattern. Below 10% RH, additional dehydration occurred in conjunction with a reversible phase transition between the monohydrate state and a dehydrated state, with a 4.0% w/w loss to 0% RH. A combination of methods was used to understand the structural changes occurring during the desolvation process, including dynamic vapor sorption measurements, thermal analysis and powder X-ray diffraction. Form I showed the characteristics of the channel hydrate, whose non-isothermal dehydration behavior proceeds in two steps: (1) the loss of non-crystalline water adsorbed on the surface, and (2) the loss of one crystalline water in the channel. Dehydrated Form I is structurally similar to the monohydrate Form I. According to the heat of fusion and the crystal density criteria, the two crystal forms belonged to the univariant system, and the anhydrate (Form III) is stable. The dehydration kinetics was achieved from the TG-DTG curves by both the Achar method and the Coats-Redfern method with 15 frequently cited basic kinetic models. The dynamic dehydration processes for steps 1 and 2 were best expressed by the Zhuralev-Lesokin-Tempelman equation, suggesting a three-dimensional diffusion-controlled mechanism.

关键词： dehydration     thermal analysis     transformation     dehydration kinetics    

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Thermodynamic assessment of hydrogen production via solar thermochemical cycle based on MoO

Jiahui JIN, Lei WANG, Mingkai FU, Xin LI, Yuanwei LU

《能源前沿（英文）》 2020年 第14卷 第1期   页码 71-80 doi: 10.1007/s11708-019-0652-9

摘要： Inspired by the promising hydrogen production in the solar thermochemical (STC) cycle based on non-stoichiometric oxides and the operation temperature decreasing effect of methane reduction, a high-fuel-selectivity and CH -introduced solar thermochemical cycle based on MoO /Mo is studied. By performing HSC simulations, the energy upgradation and energy conversion potential under isothermal and non-isothermal operating conditions are compared. In the reduction step, MoO : CH = 2 and 1020 K< <1600 K are found to be most favorable for syngas selectivity and methane conversion. Compared to the STC cycle without CH , the introduction of methane yields a much higher hydrogen production, especially at the lower temperature range and atmospheric pressure. In the oxidation step, a moderately excessive water is beneficial for energy conversion whether in isothermal or non-isothermal operations, especially at H O: Mo= 4. In the whole STC cycle, the maximum non-isothermal and isothermal efficiency can reach 0.417 and 0.391 respectively. In addition, the predicted efficiency of the second cycle is also as high as 0.454 at = 1200 K and = 400 K, indicating that MoO could be a new and potential candidate for obtaining solar fuel by methane reduction.

关键词： MoO2/Mo based on solar thermochemical cycle     methanothermal reduction     isothermal and non-isothermal operation     syngas and hydrogen production     thermodynamic analysis    

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Thermal analysis of lubricated three-dimensional contact bodies considering interface roughness

《机械工程前沿（英文）》 2022年 第17卷 第2期 doi: 10.1007/s11465-022-0672-8

摘要： Surface roughness and thermal action are of remarkable importance in the lubrication performance of mechanical components, especially in extreme conditions. However, available studies mainly focus on the full-film lubrication conditions without considering temperature rise and real 3D surface roughness due to the complexity of surface topography and temperature characteristics. Moreover, studies on the interfacial thermal behaviors of 3D rough surface lubricated contact in an extended range of working conditions remain limited. In this paper, a deterministic mixed thermal elastohydrodynamic lubrication model considering real 3D surface roughness and thermal effects is proposed. In this model, pressure and temperature are coupled with each other, the computation of elastic deformation is accelerated through the discrete convolution and fast Fourier transform method, the temperature field is calculated with the column sweeping technique, and the semi-system method is introduced to improve convergence and numerical stability under severe conditions. The model is validated by comparing its results with available published numerical and experimental results. The thermal behaviors of the contact interface are studied in a wide range of working conditions. The influences of surface roughness and thermal effect on lubrication performance are revealed. The results show that the proposed model can be used as a powerful analysis tool for lubrication performance and temperature prediction in various heavy-load, high-speed lubricated components over a wide range of lubrication conditions.

关键词： thermal elastohydrodynamic lubrication     surface roughness effect     thermal effect     temperature characteristics     severe conditions    

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Thermal decomposition of poly(ethylene terephthalate)/mesoporous molecular sieve composites

RUN Mingtao, ZHANG Dayu, WU Sizhu, WU Gang

《化学科学与工程前沿（英文）》 2007年 第1卷 第1期   页码 50-54 doi: 10.1007/s11705-007-0010-z

摘要： The nonisothermal and isothermal degradation processes of poly (ethylene terephthalate)/mesoporous molecular sieve (PET/MMS) composites synthesized by in-situ polymerization were studied by using thermogravimetric analysis in nitrogen. The nonisothermal degradation of the composite is found to be the first-order reaction. An iso-conversional procedure developed by Ozawa is used to calculate the apparent activation energy (), which is an average value of about 260 kJ/mol with the weight conversion from 0% to 30%, and is higher than that of neat PET. Isothermal degradation results are confirmed with the nonisothermal process, in which PET/MMS showed higher thermal stability than neat PET. The polymer in mesoporous channels has more stability due to the protection of the inorganic pore-wall. These results indicate that mesoporous MMS in PET/MMS composites improve the stability of the polymer.

关键词： polymerization     isothermal degradation     conversion     nonisothermal degradation     activation    

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智能手机成像的晶片上基于逆转录环介导等温扩增(RT-LAMP)技术的全血中HIV-1检测 Article

Gregory L. Damhorst,Carlos Duarte-Guevara,Weili Chen,Tanmay Ghonge,Brian T. Cunningham,Rashid Bashir

《工程（英文）》 2015年 第1卷 第3期   页码 324-335 doi: 10.15302/J-ENG-2015072

摘要：

病毒载量测量对于人类免疫缺陷病毒 (HIV) 阳性患者长期临床护理来说是一个必不可少的工具。然而，考虑到病毒载量测量所需的仪器体积、成本和操作的复杂性，在医疗基础设施较差的偏远地区 (尤其是在被HIV感染人群比例较高的地区) 普及标准的病毒载量测量仪器是较为困难的。为提高该检测方法的普及性，人们已经开始开发可以进行即时检测的病毒载量检测平台，然而尚没有解决办法能够同时满足低成本、便携、易于操作等多种实际要求。本文通过运用微流体和微型硅晶片平台，对经过最低程度处理的含有HIV的全血样本进行了逆转录环介导等温扩增 (RT-LAMP)，并利用智能手机进行了荧光检测。集成实验检测结果表明，一滴约60 nL的反应液滴中仅有的3个病毒依然可以通过RT-LAMP技术被检测到，这相当于每微升全血样品中只有670个病毒。该技术在数字化RT-LAMP方法上具有重要意义，扩展该技术能够实现对HIV阳性患者在临床护理中采集指血进行病毒载量检测。研究结果显示，病毒载量检测过程所需的各个步骤，从血滴的准备到RT-LAMP反应的成像，都可以集成为晶片实验并且可以和移动设备兼容。

关键词： 人类免疫缺陷病毒(HIV)     病毒载量     环介导等温扩增     智能手机     即时检测    

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基于链置换环介导等温扩增的量子点纳米珠标记侧流免疫检测试纸条快速灵敏检测鼠伤寒沙门氏菌 Article

Yuting Shang,Shuzhen Cai,Qinghua Ye,Qingping Wu,Yanna Shao,Xiaoying Qu,Xinran Xiang,Baoqing Zhou,Yu Ding,Moutong Chen,Liang Xue,Honghui Zhu,Jumei Zhang

《工程（英文）》 2022年 第19卷 第12期   页码 62-70 doi: 10.1016/j.eng.2021.03.024

摘要：

快速、灵敏、即时检测致病菌对食品安全至关重要。在这项研究中，开发了一种新的量子点纳米珠标记的侧流免疫检测试纸条（QB-labelled LFIAS）结合链置换环介导的等温扩增（SD-LAMP）技术，用于定量检测鼠伤寒沙门氏菌（ST）。量子点纳米珠（QB）作为荧光报告材料，具有良好的检测效率。在LAMP中使用了可定制的链置换（SD）探针，以提高方法的特异性并防止副产物捕获。检测基于夹心免疫分析法。荧光条读取器测量测试（T）线和对照（C）线的荧光强度（FI）。条带的线性检测范围为每毫升102 ~ 108个菌落形成单位（CFU）。视觉检出限为103 CFU·mL−1，表明该系统的灵敏度是AuNP 标记试纸的10 倍。根据聚合酶链反应（PCR）和SD-LAMP的琼脂糖凝胶输出分析ST 特异性。在食品中检测到ST，回收率为85%~110%。该方法快速、简便，几乎不需要设备，适用于食品中的细菌检测和临床诊断。

关键词： 鼠伤寒沙门氏菌     量子点纳米珠     侧流免疫检测试纸条     环介导等温扩增     链置换探针    

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低碳钛、钒微合金钢中的相间析出

贾涛,魏娇,冯洁,张维娜,刘振宇,王国栋

《中国工程科学》 2014年 第16卷 第1期   页码 88-92

摘要：

针对目前较少关注的Ti-V微合金体系，在Formaster—FII 膨胀仪上进行奥氏体/铁素体两相区等温，在铁素体相变同时获得Ti、V复合相间析出。采用金相、透射电子显微镜对显微组织、尤其是相间析出形貌、及其与铁素体基体的位向关系进行了观察与分析。研究表明，650 ℃为静态等温相变的鼻温点，相间析出呈层状分布，具有平面和曲面两种形貌，相间析出碳化物与铁素体基体之间存在Baker-Nutting 取向关系。

关键词： Ti-V微合金钢     相间析出     等温相变     透射电子显微镜    

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一款用于快速检测包括SARS-CoV-2 在内的19 种常见呼吸道病毒的高通量、多指标等温扩增平台 Article

邢婉丽,刘莹莹,王会丽,李尚霖,林勇平,陈蕾,赵艳,晁爽,黄小兰,葛少林,邓涛,赵添,李宝莲,王瀚博,王磊,宋云鹏,金荣华,何建行,赵秀英,刘鹏,李为民,程京

《工程（英文）》 2020年 第6卷 第10期   页码 1130-1140 doi: 10.1016/j.eng.2020.07.015

摘要：

快速、准确地诊断以及及时对感染严重急性呼吸系统综合征冠状病毒2（SARS-CoV-2）的患者进行隔离被认为是抗击新冠病毒肺炎（COVID-19）大流行的最有效的措施。本文介绍了一款高通量、多指标的等温扩增检测平台（RTisochipTM-W），该平台使用离心式微流控芯片，在90 min内即可完成一次运行，从16个样本中检测出包括SARS-CoV-2在内的19种常见呼吸道病毒。通过RTisochipTM-W系统检测的所有病毒的检出限均等于或小于50拷贝· μL−1，与常规逆转录聚合酶链反应（RT-PCR）灵敏度相当。该系统具有重复性好、鲁棒性强和特异性高的优点。最后，使用RTisochipTM-W系统对201例临床前样本、14例COVID-19阳性临床样本、25例临床确诊样本以及614例来自呼吸道感染或疑似感染的患者的临床样本进行了测试。测试结果与临床诊断结果吻合良好，也反映出呼吸道传染病的流行特征。在对SARS-CoV-2的诊断上，RTisochipTM-W系统与参考试剂盒的一致性达到98.15%。基于大量的测试结果，我们相信RTisochipTM-W系统是一款抗击COVID-19大流行的强有力工具。

关键词： COVID-19     SARS-CoV-2     微流控     核酸检测     等温扩增    

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标题 作者 时间 类型 操作

Influence of temperature on cam-tappet lubrication in an internal combustion engine

CHANG Qiuying, YANG Peiran, WANG Jing, CHEN Quanshi

期刊论文

A measurement system for thin elastohydrodynamic lubrication films

WANG Xuefeng, GUO Feng, YANG Peiran

期刊论文

A fast compound direct iterative algorithm for solving transient line contact elastohydrodynamic lubrication

null

期刊论文

A conceptual methodology for simultaneous optimization of water and heat with non-isothermal mixing

Yanlong Hou, Wanni Xie, Zhenya Duan, Jingtao Wang

期刊论文

木粉/聚丙烯复合材料的非等温结晶动力学分析

黄浪,王海刚,王清文

期刊论文

Effect of Joule heating on electro-osmotic flow in a closed-end micro-channel with isothermal and convective

Liang ZHAO, Linhua LIU,

期刊论文

Robust optimization of the billet for isothermal local loading transitional region of a Ti-alloy rib-web

Ke WEI, Xiaoguang FAN, Mei ZHAN, Miao MENG

期刊论文

The dehydration behavior and non-isothermal dehydration kinetics of donepezil hydrochloride monohydrate

Tiantian LIU, Yuanyuan RAN, Bochao WANG, Weibing DONG, Songgu WU, Junbo GONG

期刊论文

Thermodynamic assessment of hydrogen production via solar thermochemical cycle based on MoO

Jiahui JIN, Lei WANG, Mingkai FU, Xin LI, Yuanwei LU

期刊论文

Thermal analysis of lubricated three-dimensional contact bodies considering interface roughness

期刊论文

Thermal decomposition of poly(ethylene terephthalate)/mesoporous molecular sieve composites

RUN Mingtao, ZHANG Dayu, WU Sizhu, WU Gang

期刊论文

智能手机成像的晶片上基于逆转录环介导等温扩增(RT-LAMP)技术的全血中HIV-1检测

Gregory L. Damhorst,Carlos Duarte-Guevara,Weili Chen,Tanmay Ghonge,Brian T. Cunningham,Rashid Bashir

期刊论文

基于链置换环介导等温扩增的量子点纳米珠标记侧流免疫检测试纸条快速灵敏检测鼠伤寒沙门氏菌

Yuting Shang,Shuzhen Cai,Qinghua Ye,Qingping Wu,Yanna Shao,Xiaoying Qu,Xinran Xiang,Baoqing Zhou,Yu Ding,Moutong Chen,Liang Xue,Honghui Zhu,Jumei Zhang

期刊论文

低碳钛、钒微合金钢中的相间析出

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