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Analysis of heat transfer performance for turbulent viscoelastic fluid-based nanofluid using field synergy principle

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Science China(Technological Sciences) 2015年第7期58卷 1137-1145页

作者： YANG JuanCheng LI FengChen NI MingJiu YU Bo School of Physical Sciences University of Chinese Academy of Sciences School of Energy Science and Engineering Harbin Institute of Technology Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum

In this paper,the field synergy principle is firstly performed on the viscoelastic fluid-based nanofluid and other relevant fluid in channel at turbulent flow state to scrutinize their heat transfer performance based on our direct numerical simulation *** cosine values of intersection angle between velocity vector and temperature gradient vector are calculated for different simulated cases with varying nanoparticle volume fraction,nanoparticle diameter,Reynolds number and Weissenberg *** is found that the filed synergy effect is enhanced when the nanoparticle volume fraction is increased,nanoparticle diameter is decreased and Weissenberg number is decreased,*** heat transfer is also ***,the filed synergy effect is weakened with the increase of Reynolds number which may be the possible reason for the power function relationship in empirical correlation of heat transfer between heat transfer performance and Reynolds number with the constant power exponent lower than ***,it is also observed that the field synergy principle can be used to analyze the heat transfer process of viscoelastic fluid-based nanofluid at the turbulent flow state even if some negative cosine values of intersection angle exist in the flow field.

关键词： viscoelastic fluid-based nanofluid filed synergy principle intersection angle turbulent drag reduction heat transferenhancement

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Centrifuge modeling of tunneling-induced ground surface settlement in sand

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Underground Space 2019年第4期4卷 302-309页

作者： Hu Lu Jiangwei Shi Yu Wang Rong Wang Shenzhen Polytechnic No.7098 Liu Xian AvenueNanshan DistrictShenzhenChina Key Laboratory of Geomechanics and Embankment Engineering of the Ministry of Education Geotechnical Research InstituteHohai University1 Xikang RoadNanjing 210098China Department of Architecture and Civil Engineering City University of Hong KongTat Chee AvenueKowloonHong KongChina China Harbour Engineering Company Ltd. No.9Chunxiu RoadDongzhi GateDongcheng DistrictBeijingChina

Stress changes in the soil induced by tunnel excavation may cause excessive ground ***,high-quality experimental data on ground settlement due to tunnel excavation are *** this study,centrifuge tests are conducted to investigate the threedimensional ground surface settlement,considering different intersection angles and cover-to-tunnel diameter *** results indicate that the major influence zone along the longitudinal direction on the ground surface settlement is±1.25D,where D is the tunnel *** the monitoring section is perpendicular to the tunneling direction,the transverse ground settlement due to the tunnel excavation is symmetrical with respect to the tunnel *** contrast,an asymmetric ground settlement profile is observed when the monitoring section intersects the tunneling direction at an angle of 60.Applying a Gaussian curve to fit the ground surface settlement curve,the width parameter,K(i.e.,the distance between the tunnel centerline and the inflection point of the settlement trough to the tunnel burial depth),varies from 0.33 to *** ground surface settlement induced by twin tunnel excavation can be captured reasonably by superimposing two identical Gaussian *** the cover to tunnel diameter ratios(C/D)are 1.5 and 2.7,the maximum ground surface settlements are 0.67%of D and 0.35%of D,*** is clear that the maximum ground surface settlement decreases with an increase in the C/D ratio.

关键词： Ground settlement Centrifuge modeling intersection angle Cover-to-tunnel diameter Three-dimensional

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Influence of dip directions on the main deformation region of layered rock around tunnels

Influence of dip directions on the main deformation region o...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Zhen-dong Cui Da-an Liu Fa-quan Wu Key Laboratory of Engineering Geomechanics Institute of Geology and GeophysicsChinese Academy of Sciences

The influence of dip directions on the main deformation region of layered rock around tunnel is studied using a 3D distinct element code called *** learn that the main deformation regions around tunnels are regularly changeful along with different intersection angles between dip direction and advancing direction of the *** specific deformation regions can be anticipated based on detailed engineering geological survey before tunnel ***,the common deformation pattern around tunnels is found to be structural deformation including bending and slipping of layered *** main deformation region is prone to occur at the region where the normal direction of rock layer points to the inside of tunnel because the minimum tensile strength of bedding plane appears on this region and rock bending is generally easier than rock *** understanding of the main deformation regions around tunnels provides critical information for selecting the route of a tunnel,forecasting the main deformation region and designing an efficient support system.

关键词： Dip direction Main deformation region intersection angle Advancing direction of tunnels Layered rock

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Stress and Fracture Strength Analysis for Three-Way Pipes

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Advances in Manufacturing 2000年第S1期4卷 11-15页

作者： XU Jing-jing, WU Yi-min School of Electromechanical Engineering and Automation, Shanghai University, Shanghai 200072, China School of Electromechanical Engineering and Automation Shanghai University Shanghai 200072 China

Three-way pipes, T and Y pipes, are very important connecting components in pipeline systems, their strength are related to the safety of pipelines. In the case that crack is not detected in the three-way pipe, ANSYS finite element program version 5.6 is applied to study the stress distribution of the three-way pipe and to obtain the optimum fillet radius in the crotch region of the two pipes. The reasonable intersection angle of the two pipes is also obtained. In the case that a surface crack is detected in the three-way pipe, the maximum stress intensity factor (SIF) near the front of the surface crack is studied.

关键词： three-way pipes intersection angle crack fracture strength stress intensity factor (SIF) Kscc

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