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International Conference on Mechanic Automation and Control engineering (MACE)

作者： Miaoli Hao Weitao Wu Suitao Qi Bolun Yang Jianming Yang Wei Zhang Jian Lv Department of Chemical Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China Xi''an Modern Chemistry Research Institute Xi'an China

The isomerization of endo-tetrahydrodicyclopentadiene (THDCPD) to exo-THDCPD over AlCl 3 catalyst has been studied in a batch reactor. The effects of temperature, catalyst loading, and the type and amount of solvent on the isomerization rate were investigated. Under the conditions of removing both internal and external diffusion effects, a kinetic model was established and the model parameters were developed. The results showed that the endo- to exo- isomerization of THDCPD can be treated as a first-order reaction. The activation energy E 0 and pre-exponential factor obtained from Arrhenius plot are 116 kJ I mol and 3.39x10 13 respectively. The simulation results agreed well with the experimental data.

关键词： Kinetic theory Solvents Temperature Mathematical model Loading Fuels Feeds

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Supersonic Ejector to Boost Production from Low Pressure Natural Gas Field

Supersonic Ejector to Boost Production from Low Pressure Nat...

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International Conference on Computer Distributed Control and Intelligent Environmental Monitoring (CDCIEM)

作者： Gesheng Wu Daotong Chong Weixiong Chen Junjie Yan State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation Southwest Petroleum University Chendu China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

An effective way to boost natural gas production from low pressure gas field was introduced in the paper. The supersonic ejector used the energy of high pressure gas wells, which was generally wasted through the choke valve, as its power supply to boost the low pressure gas production. The field experiment of the natural gas ejector was carried out, and the performance of the ejector was also presented. Moreover, the production of low pressure natural gas well was compared when the natural gas ejector was used or not. The economic analysis shows that the recovery period of the capital was less than several months.

关键词： Monitoring Computers Distributed control

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Investigation of influencing factors of limit air-to-water ratio of cooling tower

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2011年第SUPPL. 1期32卷 134-137页

作者： Jia, Ming-Xiao Yan, Jun-Jie Ning, Tao Liu, Ming Li, Gen Zheng, Shan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Experimental investigation was conducted on the cooling tower test device using the outlet water temperature as evaluation index. The experimental results indicated that: the outlet water temperature decreased with the increase of air-to-water ratio, but the trend was decreasing gradually. The limit air-to-water ratio existed during the decrease of outlet water temperature. The outlet water temperature had little change when the air-to-water ratio was up to this value. The limit air-to-water ratio decreased with the increase of inlet air dry bulb temperature and wet bulb temperature, and increased with the increase of inlet water temperature. And the limit air-to-water ratio decreased with the increase of the flow rate of circulating water. Such conclusions may be advantageously used in guiding the design and operation of cooling tower.

关键词： Cooling towers

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Accuracy analysis of moving particle semi-implicit method

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2011年第SUPPL. 1期32卷 146-149页

作者： Duan, Guang-Tao Chen, Bin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

The viscous and pressure gradient terms, which can be solved by Green Function method theoretically, are calculated separately in MPS method. Through the analysis of kernel function, an accuracy condition of viscous term is proposed and the reasonable match between spatial and time step will increase the accuracy and stability of MPS method. Poiseuille flow is simulated and the accuracy condition is validated. In the analysis of the source term of Pressure Poisson equation, the particle number density (PND), which is very sensitive to the relative configuration of particles, yields the deviation of velocity profile from the theoretical solution. It is the fluctuation in PND that causes the spurious fluctuation of pressure.

关键词： Poisson equation

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Stress analysis of heat exchange tube with inner and outer fins under convection heat transfer conditions

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Huagong Xuebao/CIESC Journal 2011年第SUPPL. 1期62卷 86-91页

作者： Ji, Yanpeng Ma, Ting Zeng, Min Wang, Qiuwang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi China

The heat exchange tube with inner and outer fins has been widely applied in industry in order to enhance the performance of heat exchangers. When it is used in high temperature environment, the security must be considered. A three-dimension model was established to simulate the thermal stress by software ANSYS. The results indicated that the main factor, which had effect on the stress and deformation, was temperature and the maximum stress occurred at the joint location between inner fins and tubes. The inner pressure distribution of tube could enhance the effect of stress. On the contrary, the outer could weaken the effect. © All Rights Reserved.

关键词： Finite element method

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Numerical investigation on transport characteristic of air breathing direct methanol fuel cell

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Huagong Xuebao/CIESC Journal 2011年第SUPPL. 1期62卷 66-71页

作者： Miao, Zheng Zou, Jinqiang He, Yaling Liu, Zeng State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi China

A two-dimensional two-phase non-isothermal mass transport model is developed in this paper for the air breathing direct methanol fuel cell(DMFC). The self-made computer code is used to simulate the heat and mass transport characteristic which is coupled with electro-chemical reactions. The effects of temperature of the inlet methanol solution, temperature of the air, and the feeding concentration of methanol on the performance of the fuel cell are investigated. The numerical results show that the cell performance can be enhanced at a higher temperature of the inlet methanol solution and the air. Cell performance at the higher cell current densities can be improved with a higher feeding concentration of methanol. © All Rights Reserved.

关键词： Heat transfer

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Radiation transmission simulation for volumetric solar receiver by Monte Carlo method

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Huagong Xuebao/CIESC Journal 2011年第SUPPL. 1期62卷 60-65页

作者： Cui, Fuqing He, Yaling Cheng, Zedong Li, Dong Tao, Yubing State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi China

The optical model of the volumetric solar receiver has been built and corresponding solar radiation propagation process within the receiver is simulated by the Monte Carlo ray tracing method(MCRT). In the computation, the complicated photon transmission process in the SiC porous absorber is simplified as the transmission process in the statistically homogeneous and isotropic turbid media. Meanwhile, the non-uniform cylindrical coordinate grid is applied in the statistics of the absorbing energy distributions, which could reduce much computation effort compared with normal uniform grid. Based on the above model, the energy distribution of irregular macro scale porous absorber is counted. The results show that, under the given working condition, the radiation heat flux is concentrated at the top area of absorber and the maximum heat flux value is up to 2.87 × 109 W· m-3, but it decreases quickly in the sideward area. The heat flux distribution of whole porous absorber exhibits a great non-uniform characteristic, which would affect the stability and safety of receiver. © All Rights Reserved.

关键词： Monte Carlo methods

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Experimental study of natural convection in horizontally-positioned open-celled metal foams

Experimental study of natural convection in horizontally-pos...

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International Conference on Materials for Renewable Energy and Environment

作者： Z. G. XU Z. G. QU C. Y. ZHAO State Key Laboratory of Multiphase Flow School of Energy and Power Engineering Xi'an Jiaotong University

ISBN: (纸本)9781612847498

Experimental study of air natural convection in horizontally-positioned copper metallic foams with open cells was conducted. Temperature distributions on the heating surface were tested under different heating power for foam samples having different porosities and pore densities. The effects of porosity and pore density on the total thermal resistance of the foam sample were quantified. It is found that the porous surface can enhance the natural convection and reduce the thermal resistance by about 20% in comparison with a smooth surface. The surface area density and mass flow rate in natural convection are affected by porosity and pore density simultaneously. When the porosity is relative small (ε = 90%), there exits a critical value of the Gr number (turning point) for two pore densities (10ppi and 40ppi). When the Gr number is less than this critical value, the foam with a higher pore density has the lower total thermal resistance, whereas when the Gr number exceeds the turning point value, the opposite holds. If the porosity is increased to ε = 95%, the foam with a higher pore density has the lower thermal resistance in the whole experimental range. When the porosity and pore density is the same, the foam with smaller size has the higher thermal resistance in the whole experimental range. If the size is relatively small (100×100×50mm), for the two pore densities studied (20ppi and 80ppi), there exits a critical value of the Gr number (turning point). The foam with a lower porosity (ε = 90%) has the lower thermal resistance and the decrease is more obvious for the case of 80ppi. If the size is relatively big(100×100×80mm), there exists a critical value of the Gr number (turning point) only for the case of 10ppi. When the Gr number is less than this critical value, the foam with a higher porosity (ε = 95%) has the higher total thermal resistance, the opposite holds. While for the other two pore densities (20ppi and 40ppi), there is no turning point. The foam with

关键词： Metal foam Natural convection Porosity Pore density Thermal resistance

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Single electron loss in the collisions of C^(3+) and atomic hydrogen

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Chinese Physics B 2010年第9期19卷 344-348页

作者：刘会平欧阳晓平胡华四苏光辉 State Key Laboratory of Multiphase Flow in Power Engineering Department of Nuclear Science and TechnologyXi'anjiaotong University

This paper studies the projectile electron loss cross sections of C^3＋ colliding with atomic hydrogen in the frame work of extended over-barrier model at intermediate velocities （25 keV/u-600 keV/u）. The electron loss is calculated in terms of the interaction between the screened target nucleus and the active projectile electron and of the interaction between projectile electron and target electron. Compared with the convergent close-coupling calculations, screening and anti-screening calculations, this model satisfactorily reproduces the experimentally obtained energy dependence of the electron-impact ionisation cross sections and the single electron loss cross sections over the energy range investigated here.

关键词： single electron loss over-barrier model

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Measurement of laminar burning velocities of iso-butanol-air mixtures

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Chinese Science Bulletin 2010年第19期55卷 2046-2056页

作者： FENG PengFei GU XiaoLei HUANG ZuoHua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

The laminar burning velocity of iso-butanol-air mixtures was measured under different initial pressures,initial temperatures and equivalence ratios using high-speed schlieren photography and outwardly propagation flame in a constant volume combustion *** on the analysis of stretched flame propagation speed and stretch rate,the laminar burning velocities and Markstein lengths of iso-butanol-air flames are *** accordance,with photos of flame,an analysis of flame stability and the influencing factors is carried *** results show that the laminar burning velocity is decreased with the increase of initial pressure and is increased with the increase of initial *** maximum value of laminar burning velocity is presented at the equivalence ratio of *** Markstein length is decreased with the increase of equivalence *** specified equivalence ratio,the Markstein length is decreased with the increase of initial temperature and initial ***,the flame instability is increased with the increase of equivalence ratio,initial temperature and initial pressure.

关键词：层流燃烧速度空气混合物速度测定异丁醇火焰传播速度初始压力初始温度当量比

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