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Numerical simulations of the discontinuous progression of cerebral aneurysms based on fluid-structure interactions study

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Science China(Physics,Mechanics & Astronomy) 2010年第5期53卷 944-953页

作者： MA XiaoQi1,WANG YueShe1,YU FangJun1 & WANG GuoXiang1,2 1 state key laboratory of multiphase flow in power engineering,Xi’an Jiaotong University,Xi’an 710049,China 2 Department of Mechanical engineering,The University of Akron,Akron,OH 44325-3903,USA 1. State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China2. Department of Mechanical Engineering The University of Akron Akron OH 44325-3903 USA

Investigations into the characteristics of hemodynamics will provide a better understanding of the pathology of cerebral aneurysms for *** this work,a steady state discontinuous-growth model of the cerebral aneurysms was *** the assumption of the fluid-structure interaction between the wall of blood vessel and blood,a fluid-structure coupling numerical simulation for this model was built using software ANSYS and *** simulation results showed that as the aneurysm volume increased,a blood flow vortex came forth,the vortex region became asymptotically larger,and eddy density became gradually stronger in *** the emergence of the vortex region,the blood flow in the vicinity of the downstream in the aneurysms volume turned into bifurcated flow,and the location of the flow bifurcated point was shifted with the aneurysm volume growing while directions of the shear stress applied to two sides of the bifurcated point were *** Von Mises stress distribution along the wall of aneurysm volume decreased in the prior period and increased gradually in the later *** maximum stress was in the neck of the volume and the minimum was on the distal end in the whole process of *** was shown that as the aneurysm increased the maximum deformation location of the aneurysm,vertical to the streamline,was transferred from the distal end of the aneurysm to its neck,then back to its distal end of the aneurysm again.

关键词： cerebral aneurysm fluid-structure interaction wall shear stress discontinuous progression

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Catalytic combustion of ventilation air methane in a reverse-flow reactor

Catalytic combustion of ventilation air methane in a reverse...

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作者： Wang, Yikun Man, Chengbo Che, Defu State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xian Jiaotong University Xian 710049 China

This paper describes an experimental study on the catalytic combustion of ventilation air methane in a vertical reactor. The mixture of natural gas and compressed air was used in the experiments, and the combustion products were analyzed by the Fourier transform infrared (FTIR) gas analyzer. The effects of the initial temperature, cycle time, feed gas concentration, and space velocity were studied. The experimental results show that the reactor could run under a wide range of operating conditions with self-sustaining operation and high methane conversion. Besides, it could even run with a feed gas concentration as low as 0.13 vol % without generation of CO and NOx, which has not been achieved in previous studies. The optimization of operating parameter combination increases the stability and efficiency of combustion. Different from the previous studies, the present research shows that the temperature profile of the cyclic steady state is not affected by the initial temperature. In addition, the methane conversion and reaction zone change during the process of the reaction. Thus, there is a limitation about the employment of a gas chromatograph (GC) to measure the methane concentration. Moreover, the presence of natural convection makes the temperature profiles of the cycle steady state asymmetrical. © 2010 American Chemical Society.

关键词： Compressed air

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Mechanotransduction in Tooth Pain Sensation

Mechanotransduction in Tooth Pain Sensation

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The 5th Shanghai International Conference on Biophysics and Molecular biology 第五届上海国际力生物学学术会议(SICBM2011)

作者： Min Lin ZhengYuan Luo BoFeng Bai Feng Xu TianJian Lu Biomedical Engineering and Biomechanics Center School of AerospaceXi''an Jiaotong UniversityXi''an 710049PR.China State Key Laboratory of Multiphase Flow in Power EngineeringXi''an Jiaotong UniversityXi''an 710049PR China Biomedical Engineering and Biomechanics CenterSchool of AerospaceXi''an Jiaotong UniversityXi''an 710049PR.China HST-Center for Biomedical Engineering Department of MedicineBrigham and Women''s HospitalHarvard Medical SchoolBostonMAUSA

Cold stimuli evoke more rapid transient pain sensations in human teeth than hot ***, the underlying mechanism remains *** has been reported that hot stimuli cause an inward flow (toward the tooth pulp chamber) of the dentinal fluid in dentinal microtubules while cold stimuli cause flow in a reverse *** study attempts to quantify tooth pain sensation by coupling a computational fluid dynamics (CFD) model, which describes the fluid mechanics in dentinal microtubules, with a modified Hodgkin-Huxley (H-H) model, which describes the neural discharge behavior.

关键词： tooth pain sensation dentinal fluid flow fluid dynamics model Hodgkin-Huxley (H-H) model mechanoreceptor neural discharging

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Two-phase distributor in plate fin heat exchanger

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Huagong Xuebao/CIESC Journal 2011年第SUPPL. 1期62卷 31-36页

作者： Yuan, Pei Jiang, Guobao Zhang, Feini He, Yaling Tan, Minbang Tao, Wenquan School of Energy and Power Engineering State Key Laboratory of Multi-phase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi China Company Jianyang 641400 Sichuan China

The maldistribution of two-phase flow is one of the major factors that deteriorate the heat transfer performance of plate-fin heat exchanger. The set-up of flow distributor at the heat exchanger inlet is one widely adopted engineering method to improve the flow distribution. In this paper the flow distribution performance of one type of distributor is experimentally tested by using air-water mixture. The test results show that the flow distributor studied can improve the two-phase flow distribution uniformity in plate-fin heat exchanger. © All Rights Reserved.

关键词： Two phase flow

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Phase identification by a novel needle-contact capacitance probe in gas-liquid two-phase flows

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Nuclear Science and Techniques 2010年第5期21卷 316-320页

作者： HUANG Shanfang LU Jun ZHANG Bingdong WANG Dong Department of Engineering Physics Tsinghua University Beijing 100084 China State Key Laboratory of Multiphase Flow in Power Engineering Xi 'an Jiaotong University Xi'an 710049 China Beijing Aerospace Institute for Metrology and Measurement Technology Beijing 100076 China

In this paper,we propose a novel probe to identify phases in any two-phase flows where one phase is conductive and the other *** can further obtain many parameters such as void fraction,bubble velocity,and interfacial area *** with the traditional probe,the novel probe has unique advantages that it is less dependent on water conductance or distance between the electrodes,and that the amplitude is bigger between high and low *** analyses showed that the measurement error became higher when water conductance decreases or distance increases,which is consistent with the theoretical *** results showed that the output signal kept constant with salt content of 0-5% and electrode distance of 0-30 mm in tap *** level difference was up to 6.4 V,resulting in identifying two phases *** traces of phase identification were completely consistent with the flow structures.

关键词：气液两相流探头接触式鉴定一阶电导电极水电导率气泡速度

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Impacts of different diameter combinations on the temperature of a crude oil pipeline when colocating with a products pipeline

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中国高等学校学术文摘·能源与动力工程 2010年第2期4卷 192-197页

作者： Bo YU Yue SHI Xin LIU Jinjun ZHANG Jinjia WEI Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum BeijingBeijing 102249China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

In order to show the effects of different diameter combinations on crude oil temperature when a crude oil pipeline and a products pipeline are laid in one trench, four typical diameter combinations are selected to conduct numerical simulation. After a series of calculations, the minimum mean temperature difference and the maximum temperature difference of the crude oil along the pipelines are obtained. In real pipeline constructions, the effects of other diameter combinations on crude oil temperature can be predicted by the method of linear interpolation to calculate results of the four diameter combinations obtained in this study.

关键词： technology of laying two pipelines in one trench diameter combinations crude oil temperature pipeline interval

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Dynamic characteristics of molten droplets and hot particles falling in liquid pool

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中国高等学校学术文摘·能源与动力工程 2010年第2期4卷 246-251页

作者： Liangxing LI Huixiong LI Tingkuan CHEN Weimin MA Nuclear Power Safety Division Royal Institute of Technology (KTH)SE-106 91 StockholmSweden State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

The dynamic characteristics of molten droplets and hot particles at the very beginning of their fall into coolant pools are presented. The falling course of a single droplet or a single hot particle was recorded by a highspeed camera and a curve of velocity vs. time was obtained. Emphasis was placed on the effects of the droplet's size and temperature, the coolant's temperature and properties, and the droplet's physical properties on the moving behavior. The results for the all cases showed that the velocity of a falling droplet/particle decreased rapidly but rebounded shortly, at the beginning of droplet/particle falling in the coolant. Following such a V-shaped evolution in velocity, the droplet/particle slows down gradually to a comparatively steady velocity. An increase in either coolant temperature or droplet temperature results in a larger velocity variation in the 'J-region', but a smaller deceleration when it moves out of the 'J-region'. The elevated volatility of a coolant leads to a steeper deceleration in the 'J-region' and beyond. The bigger size of a particle leads to a greater velocity variation in the 'J-region' and terminal velocity. A high melting point and thermal conductivity as well as lower heat capacity contribute to dramatic variation in the 'J-region' and low terminal velocity.

关键词： dynamic characteristics molten droplets high-temperature particles fuel and coolant interactions

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Electronic Structures and Optical Absorption Properties of Ni-doped Anatase TiO2for Photocatalysis from First-Principles Calculation 18

Electronic Structures and Optical Absorption Properties of N...

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18th World Hydrogen Energy Conference, WHEC 2010

作者： Liu, Maochang Zhou, Zhaohui Li, Mingtao Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University 28 Xianning Street Shaanxi Xi'an710049 China

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The concentration measurement of Biomass/Pulverized Coal/Air threephase flow based on electrostatic and capacitive method 6

The concentration measurement of Biomass/Pulverized Coal/Air...

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6th World Congress in Industrial Process Tomography

作者： Zhang, Juan Hu, Hongli Dong, Jun Zhang, Xiao Xu, Tongmo State Key Laboratory of Power Equipment and Electrical Insulation Xi’an Jiaotong University Xi’an710049 China State Key Laboratory of Power Engineering and Multiphase Flow Xi’an Jiaotong University Xi’an710049 China

ISBN: (纸本)9780853163220

A system for the phase concentration measurement of biomass/pulverized coal/air threephase flow based on electrostatic sensor and capacitive sensor data fusion in pneumatic conveying fuel system at power stations is developed. Because electrostatic sensor is more sensitive to dilute pulverized coal, while capacitive sensor to biomass, they are used in the measurement of biomass concentration and pulverized coal concentration in biomass/pulverized coal/air threephase flow. flow regimes are identified by HHT of the electrostatic sensor output signal. Under the certain flow regime identified, the dual regression analysis method is applied to work out the biomass concentration and the pulverized coal concentration. The experiment result indicates that the system has high linearity up to 5%. © 2010, International Society for Industrial Process Tomography. All rights reserved.

关键词： Biomass

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Single electron loss in the collisions of Ca+ and atomic hydrogen

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中国物理B（英文版） 2010年第9期19卷 344-348页

作者： Liu Hui-Ping Ouyang Xiao-Ping Hu Hua-Si Su Guang-Hui State Key Laboratory of Multiphase Flow in Power Engineering Department of Nuclear Science and TechnologyXi'anjiaotong UniversityXi'an 710049China

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