Science in China Ser. E Engineering & Materials Science最新文献

A generalized solution of elasto-aerodynamic lubrication for aerodynamic compliant foil bearings 气动柔性箔轴承弹性-气动润滑的广义解

Science in China Ser. E Engineering & Materials Science Pub Date : 2005-08-20 DOI: 10.1360/03YE0551

Lie Yu, Shemiao Qi, Haipeng Geng

引用次数: 21

A cellular automata evacuation model considering friction and repulsion 考虑摩擦和排斥的元胞自动机疏散模型

Science in China Ser. E Engineering & Materials Science Pub Date : 2005-08-20 DOI: 10.1360/03YE0486

Weiguo Song, Yanfei Yu, W. Fan, Heping Zhang

{"title":"A cellular automata evacuation model considering friction and repulsion","authors":"Weiguo Song, Yanfei Yu, W. Fan, Heping Zhang","doi":"10.1360/03YE0486","DOIUrl":"https://doi.org/10.1360/03YE0486","url":null,"abstract":"There exist interactions among pedestrians and between pedestrian and environment in evacuation. These interactions include attraction, repulsion and friction that play key roles in human evacuation behaviors, speed and efficiency. Most former evacuation models focus on the attraction force, while repulsion and friction are not well modeled. As a kind of multi-particle self-driven model, the social force model introduced in recent years can represent those three forces but with low simulation efficiency because it is a continuous model with complex rules. Discrete models such as the cellular automata model and the lattice gas model have simple rules and high simulation efficiency, but are not quite suitable for interactions’ simulation. In this paper, a new cellular automata model based on traditional models is introduced in which repulsion and friction are modeled quantitatively. It is indicated that the model can simulate some basic behaviors, e.g. arching and the “faster-is-slower” phenomenon, in evacuation as multi-particle self-driven models, but with high efficiency as the normal cellular automata model and the lattice gas model.","PeriodicalId":391126,"journal":{"name":"Science in China Ser. E Engineering & Materials Science","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133572584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 56

Experimental investigations on the fluid flow mechanism in porous media of enhanced oil recovery by alkli/surfactant/polymer flooding 碱/表面活性剂/聚合物驱提高采收率多孔介质流体流动机理实验研究

Science in China Ser. E Engineering & Materials Science Pub Date : 2005-08-20 DOI: 10.1360/04YE0211

Jialu Wang, P. Shen, Yongzhong Chen, Zubo Zhang, Xuening Jia, Yuling Tian

{"title":"Experimental investigations on the fluid flow mechanism in porous media of enhanced oil recovery by alkli/surfactant/polymer flooding","authors":"Jialu Wang, P. Shen, Yongzhong Chen, Zubo Zhang, Xuening Jia, Yuling Tian","doi":"10.1360/04YE0211","DOIUrl":"https://doi.org/10.1360/04YE0211","url":null,"abstract":"The fluid flow mechanism in porous media of enhanced oil recovery by Alkli/ Surfactant/Polymer (ASP) flooding is investigated by measuring production performance, pressure distribution and saturation distribution through installing differential pressure transducers and saturation measuring probes in a physical model of vertical heterogeneous reservoir. The fluid flow variation in porous media is the main reason of enhanced oil recovery of ASP flooding. The pressure field and saturation field are nonlinearly coupled together and the interaction between them results in the fluid flow variation in the reservoir. In a vertical heterogeneous reservoir, the ASP agents initially flow in the high permeability layers because the resistance in the high permeability layer is increased under the physical and chemical action of adsorption, retention and emulsion. ASP flooding displaces out not only the residual oil in the high permeability layer, but also the remaining oil in the low and the middle permeability layers by increasing swept volume and displacing efficiency.","PeriodicalId":391126,"journal":{"name":"Science in China Ser. E Engineering & Materials Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130761101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Effect of interface kinetics on the eutectic growth 界面动力学对共晶生长的影响

Science in China Ser. E Engineering & Materials Science Pub Date : 2005-08-20 DOI: 10.1360/102004-91

Jinfu Li, Yaohe Zhou

引用次数: 9

Jet flows from bubbles during subcooled pool boiling on micro wires 微丝上过冷池沸腾时气泡射流

Science in China Ser. E Engineering & Materials Science Pub Date : 2005-08-20 DOI: 10.1360/04YE0052

Hao Wang, D. Christopher, Xiao-feng Peng, B. Wang

{"title":"Jet flows from bubbles during subcooled pool boiling on micro wires","authors":"Hao Wang, D. Christopher, Xiao-feng Peng, B. Wang","doi":"10.1360/04YE0052","DOIUrl":"https://doi.org/10.1360/04YE0052","url":null,"abstract":"An experimental investigation was conducted on subcooled nucleate boiling on ultra-small wires having diameters of 25–100 μm. High-speed photography and laser PIV (Particle Image Velocimetry) technology were used to visually observe the bubble dynamics. For highly subcooled boiling, at moderate heat fluxes, the bubbles generally remained attached to the micro heating wires and bubble-top jet flows were clearly observed. Smaller bubbles usually had stronger bubble-top jet flows, while larger bubbles seemed to produce multi-jet flows. The structures of the bubble-top jet flows, as well as multi-jet flows, were proposed from the experimental observation. A model was developed to describe jet flow phenomena from bubbles on micro wires. Numerical simulations for bubbles having diameter of 0.03 and 0.06 mm showed that both the bubble-top and multi-jet flows were induced by a strong Marangoni effect due to high temperature gradients near the wire. The predicted velocity magnitudes and flow structures agreed very well with experimental measurements. The bubble size relative to the wire is an important factor affecting the jet flow structure. For a 0.03 mm bubble on a 0.1 mm wire, only a bubble-top jet flow forms, while a complex multi-jet flow pattern forms around the bubble with a weak bubble-top jet and two side jet flows for a 0.06 mm bubble.","PeriodicalId":391126,"journal":{"name":"Science in China Ser. E Engineering & Materials Science","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125444057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Sensitivity analysis of dimensionless parameters for physical simulation of water-flooding reservoir 水驱油藏物理模拟无因次参数敏感性分析

Science in China Ser. E Engineering & Materials Science Pub Date : 2005-08-20 DOI: 10.1360/04YE0290

Y. Bai, Jiachun Li, Jifu Zhou

引用次数: 10

Mechanism of conductive powder microstructure evolution in the process of SPS SPS过程中导电粉末微观结构演变机理

Science in China Ser. E Engineering & Materials Science Pub Date : 2005-06-20 DOI: 10.1360/04YE0265

Xiaoyan Song, Xuemei Liu, Jiuxing Zhang

引用次数: 18

Nearfield acoustic holography based on the equivalent source method 基于等效源方法的近场声全息

Science in China Ser. E Engineering & Materials Science Pub Date : 2005-06-20 DOI: 10.1360/03YE0538

C. Bi, Xinzhao Chen, Jian Chen, Rongyan Zhou

{"title":"Nearfield acoustic holography based on the equivalent source method","authors":"C. Bi, Xinzhao Chen, Jian Chen, Rongyan Zhou","doi":"10.1360/03YE0538","DOIUrl":"https://doi.org/10.1360/03YE0538","url":null,"abstract":"On the basis of the nearfield acoustic holography (NAH) based on the distributed source boundary point method (DSBPM), a novel NAH based on the equivalent source method (ESM) is proposed. The theoretical model of the proposed method is established at first. And then, the error sensitivity and the reconstruction problems of a multi-source acoustic field and a semi-free acoustic field are analyzed, and the corresponding treatment methods are proposed. Subsequently, an experiment on a speaker is investigated to validate the feasibility and correctness of the method. In the method, no discretization is needed on the boundary of the vibrating body. The acoustic field is predicted directly by a set of weighted equivalent sources located inside the vibrating body. Therefore, the variable interpolation, the treatments of singular integrals and non-uniqueness of solutions in the characteristic wave number are avoided. Additionally, the method is adapted to arbitrary-shaped source, so it is really a meshless method. Furthermore, there are such merits as the simple principle, the high calculation efficiency and precision. It is valuabe for the NAH to be applied in the practical engineering field.","PeriodicalId":391126,"journal":{"name":"Science in China Ser. E Engineering & Materials Science","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123591784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 56

Some key technics of drop tower experiment device of National Microgravity Laboratory (China) (NMLC) 中国国家微重力实验室落塔实验装置若干关键技术

Science in China Ser. E Engineering & Materials Science Pub Date : 2005-06-20 DOI: 10.1360/102004-21

Xiaoqian Zhang, Longgen Yuan, Wen-ping Wu, Lanqiao Tian, Kangzhuang Yao

引用次数: 30

The study of adsorption gas sensor based carbon nanotube film 基于碳纳米管薄膜的吸附式气体传感器的研究

Science in China Ser. E Engineering & Materials Science Pub Date : 1900-01-01 DOI: 10.1360/04ye0231

Xin Li, Junhua Liu, Changchun Zhu

引用次数: 1