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23rd International Congress of Theoretical and Applied Mechanics

作者： Hao Xiang Bin Chen State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

The moving particle semi-implicit method(MPS) is a Lagrangian particle method which is suitable for simulating surface flows *** paper couples the non-Newtonian model with the MPS method by treating the non-Newtonian ... 详细信息

关键词： A numerical study of the MPS method for simulating non-newtonian free surface flows

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Study on Performance of Double Helical Capacitance Probe for Water Fraction Measurement in multiphase flow

Study on Performance of Double Helical Capacitance Probe for...

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The 7th International Symposium on Measurement Techniques for multiphase flows

作者： J.Ye L.J.Guo H.L.Zhou State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

A type of capacitance probe performance with two brass electrodes intertwined on the outer wall of insulation pipe like a double helix is investigated numerically in this paper,which can measure water fraction in air-oil-water two or three-phase flow in oil *** motivation of this paper is to optimize this kind of probe to improve its electric response and spatial resolution and so a 3-D numerical simulation using finite element method is employed to evaluate the effect of electrodes configuration of this capacitance probe on measuring water fraction in horizontal *** electrostatic field of the probe is preliminarily analyzed referred to stratified flow of air-water two-phase flow *** parameters are considered as main variables which have an important effect on the precision of the probe,such as central angle,position angle and length of the two *** the electrostatic field analysis,lumped capacitance between the two electrodes is obtained in every different electrode geometry model and the results of each model are compared to each other in order to select a better arrangement of the electrodes that has a better response to water *** by using circuit simulation method,the numerical calculated lumped capacitance is transferred to voltage output through the circuit used in the *** relationship between voltage and water fraction of calculated and experimental result are compared in order to test the reasonableness of the *** results show that at high water fraction,the difference between numerical and measured data agrees very well.

关键词： Numerical simulation water fraction capacitance probe multiphase flow

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An Experimental Study of on-line Measurement of Water Fraction in Gas-Oil-Water Three-Phase flow

An Experimental Study of on-line Measurement of Water Fracti...

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The 7th International Symposium on Measurement Techniques for multiphase flows

作者： K.Chen L.J.Guo J.Ye State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Gas-oil-water two- or three-phase flow is widely encountered in industry,such as petroleum chemical industry,bio-chemicals,food chemicals,and mineral engineering and energy *** kinds of on-line measurement technique,which are double-ring conductance sensor and double-helical capacitance sensor,for water fraction in oil-water two-phase flow and gas-oil-water three-phase flow were developed in this *** calibration results shows that the responses of the two sensors are good enough as the variation of water *** on the other hand,it is possible that the oil and the gas regard as one phase in gas-oil-water three-phase flow by using double-helical capacitance sensor,and the ratio between water and gas has no effect with the output *** range of water fraction which can be measured becomes bigger and bigger because of the using of new *** the capacitance sensor is better enough to measure water fraction in the three phases *** dynamic experiment,because of phase inversion phenomenon between oil and water,the conductance sensor outputs poorly,however the capacitance sensor performs somewhat *** reason for the error using capacitance sensor is the edge effect of the *** experiment results show that the edge effect of the double-helical capacitance sensor causes that the output is smaller so that the measuring water fraction is a litter larger than the actual *** when the variation of water fraction is above 10%,the edge effect of capacitance sensor can be almost *** the contrary,when the variation of water fraction is below 10%,the edge effect is so lager than the results above that it cannot be ***,the double-helical capacitance probe is more suitable for measuring water fraction in slug flow and oil-water emulsion,in which the results agree better with static calibration than that in bubble flow.

关键词： Double-ring conductance sensor Double-helical capacitance sensor Gas-oil-water three-phase flow Water fraction Measurement technique

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CaTaO2N-CaZrO3 solid solution: Band-structure engineering and visible-light-driven photocatalytic hydrogen production

CaTaO2N-CaZrO3 solid solution: Band-structure engineering an...

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作者： Wu, Po Shi, Jinwen Zhou, Zhaohui Tang, Wendong Guo, Liejin International Research Center for Solar-Hydrogen Renewable and Clean Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University 28 West Xianning Street Xi'an 710049 China

A series of CaTaxZr(1-x)O(3-x)N x solid solutions were successfully synthesized through nitriding precursors prepared by the polymerized complex method. The physicochemical properties of these multicomponent semiconductors were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), N2 adsorption-desorption isotherms, UV-visible optical absorption spectra (UV-Vis) and density functional theory (DFT) calculations. The diffraction peaks in XRD patterns gradually shifted to higher angles as x increased, indicating that CaTaxZr(1-x)O(3-x)Nx solid solutions had been formed. The absorption edges in UV-Vis spectra red-shifted monotonically as x increased, demonstrating that the band gap of the prepared photocatalysts could be precisely controlled with the adjustment of compositions. The solid solutions rendered photocatalytic H2 evolution from a formic acid aqueous solution under visible-light irradiation. The narrow band gap, sufficient crystallization, enough pore volume and large specific surface area resulted in the best photocatalytic activity of CaTa 0.8Zr0.2O2.2N0.8. Highlights: CaTaxZr(1-x)O(3-x)Nx solid solutions were synthesized by PC method. Absorption edges red-shifted monotonically as x increased. CaTa0.8Zr0.2O2.2N0.8 showed best H2 evolution. Band gap and specific surface area were both key factors. © 2012 Hydrogen Energy Publications, LLC.

关键词： Solid solutions

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Experimental study of two-phase flow instability of vertical parallel rifled tube with different sizes at low-mass flow rate

Experimental study of two-phase flow instability of vertical...

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作者： Deng, Zhian Luo, Yushan Wang, Haijun Chen, Tingkuan State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University No. 28 Xianning Road Xian China Xi'An Shiyou University 2 Dianzi Road Xian 710065 China

Under certain operating conditions, two-phase flow oscillations can occur and induce undesired problems such as system control, vibration, tube burn-out, etc. Therefore, it is essential to avoid and control two-phase flow instabilities when designing and operating equipments that are susceptible to such effects. The authors conducted an experimental study of vapor-liquid two-phase flow instabilities in vertical parallel tubes for a high-pressure vapor-water loop. Two types of vertical parallel rifled tubes (31.8 mm OD × 6 mm thickness, and 28.6 mm × 5.8 mm) were used as the tube sections. During experimentation, pressure-drop and density-wave type oscillations appeared, and the influence of the inlet pressure, mass flow rate, and inlet subcooling on the two-phase flow instability in both types of vertical parallel-connected tubes was studied. The results showed that with an increase in the inlet pressure and mass flow rate, the boundary thermal load of the pressure-drop and density-wave oscillations increased. As the inlet pressure increased, so the boundary quality of the pressure-drop and density-wave oscillations occurring in both types of the rifled tubes also increased. Experiments showed that under the same operating conditions, the stability of the 31.8 × 6 mm rifled tube is better than the 28.6 × 5.8 mm rifled tube. For the 31.8 × 6 mm rifled tube, the occurrence of the boundary quality of the pressure-drop type oscillation increased with the increasing mass flow rate. However, for the 28.6 × 5.8 mm rifled tube, the occurrence of the boundary quality of the pressure-drop oscillation first increased and then decreased with an increasing mass flow. © 2011 Curtin University of Technology and John Wiley & Sons, Ltd.

关键词： Pressure drop

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Study on the Radiation Distribution in A Fluidized Tubular Reactor for Heterogeneous Photocatalytic Hydrogen Production

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Procedia Environmental Sciences 2012年 12卷 285-292页

作者： Zhao Liang Fan Liangliang Jing Dengwei Liu Wenxu Cao Fei Zhu Xule Yang Junyin Zhang Hailong State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an P.R.China

Radiation distribution study is of importance for the design and the optimization of fluidized photocatalytic tubular reactor which has been developed for photocatalytic hydrogen production under direct solar light. In the present study, the radiation distribution in such reactor was successfully simulated by adopting Monte Carlo method and the six-flux radiation absorption-scattering models. Both the incident angles of light around the reactor and the concentration distribution of photocatalyst were taken into account. Our analysis indicates that the angles and the intensity of the incident rays significantly affect the radiation distribution. Moreover, it was also found that the equilibrium radiation distribution has a close relationship with the density distribution of the photocatalysts. The simulated results are expected to be helpful for obtaining the optimal operating parameters for solar photocatalytic hydrogen production.

关键词： Radiation distribution Fluidized tubular reactor Nanometer catalyst Compound parabolic concentrators

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Experimental study on condensation heat transfer of ethanol-water mixtures on a vertical mini-tube

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AIP Conference Proceedings 2012年第1期1428卷 35-42页

作者： XiPing Chen JunJie Yan RongHai Huang JiPing Liu State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiao tong University Xi'an City 710049 China

Experiments were carried out to investigate condensation of ethanol-water vapor mixtures on a vertical mini-tube with outer diameter of 1.032mm. The length, inter diameter of the tube was 110mm, 0.727mm, respectively. The tests were performed at a wide range of ethanol concentrations (Cv=0%, 1%, 2%,5%) and varied velocity of vapor (Uv=2m/s, 4m/s, 6m/s) and pressure (Pv=31.2kPa, 47.4kPa, 84.5kPa). With the change of the vapor-to-surface temperature difference, the heat transfer coefficients revealed nonlinear characteristics with the peak values under all ethanol mass fractions of vapor. The heat transfer coefficients decreased with increasing ethanol mass fraction of vapor.

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Electropolymerization of Ni(salen) on carbon nanotube carrier as a capacitive material by pulse potentiostatic method

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Science China Chemistry 2012年第7期55卷 1338-1344页

作者： LI JianLing GAO Fei ZHANG YaKun KANG FeiYu WANG XinDong YE Feng YANG Jun State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China China Electric Power Research Institute Beijing 100192China Department of Material Science and Engineering Tsinghua UniversityBeijing 100084China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of SciencesBeijing 100080China

The composites of poly[Ni（salen）] and multi-walled carbon nanotube （MWCNT） were synthesized by pulse potentiostatic method. The composites were characterized by field emission scanning electron microscopy, Fourier transform infrared spectra, and electrochemical impedance spectroscopy. The wrapping of carbon nanotubes with poly[Ni（salen）] varied significantly with anodic pulse duration. Variance of structure of poly[Ni（salen）] caused by anodic pulse duration affected the ability of absorption to solvent molecules or solvated ions, which was indicated by v （C≡N） intensity. The ability to store/release charge of poly[Ni（salen）] caused by redox switching was evaluated in the form of low-frequency capacitance. Correlations of chargetransfer resistance/ionic diffusion resistance with potential and anodic pulse duration were investigated.

关键词： poly[Ni（salen）] carbon nanotubes potential pulse electrochemical impedance spectroscopy

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Surfactant’s Effect on the Photoactivity of Fe-doped TiO2

Surfactant’s Effect on the Photoactivity of Fe-doped TiO2

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中国材料大会2012

作者： Qingyun Chen Chao Xue Xianglin Li Yunhai Wang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiao tong University

ISBN: (纸本)9783037856062

Ti(OC4H9)4 was used as the Ti precursor and titanium dioxide (TiO2 ) was prepared by sol-gel method. During the preparation process, Fe3+ was doped and different surfactants, such as SDS, PEG, CTAB, were added to improve the photocatalytic activity of TiO2 . The effect of the different type of surfactants on the structure of Fe-doped TiO2 was discussed. The photocatalysts were characterized by thermogravimetric thermal analysis, X-ray diffraction, scanning electron microscopy and UV-Vis spectrophotometer. The red shift of the absorption edge of the Fe-doped TiO2 prepared by using different surfactants was observed. Methyl orange (MO) solution was degraded under sunlight irradiation to evaluate the photocatalytic performance. The results indicated that the photocatalyst prepared with PEG addition had the highest activity and MO degradation ratio could reach 90% after 4 hours irradiation with the best photocatalyst.

关键词： Sol-gel, Iron-doped titania, Photocatalytic activity, Surfactant.

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Experimental Study on Condensation heat transfer of Ethanol-Water Mixtures on a Vertical Mini-tube

Experimental Study on Condensation heat transfer of Ethanol-...

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The 7th International Symposium on Measurement Techniques for multiphase flows

作者： Chen XiPing Yan JunJie Huang RongHai Liu JiPing State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiao tong University

Experiments were carried out to investigate condensation of ethanol-water vapor mixtures on a vertical mini-tube with outer diameter of 1.032 *** length,inter diameter of the tube was 110 mm,0.727 mm,*** tests were performed at a wide range of ethanol concentrations(Cv=0%,1%,2%,5%) and varied velocity of vapor(Uv=2m/s,4m/s,6m/s) and pressure(Pv=31.2kPa,47.4kPa,84.5kPa).With the change of the vapor-to-surface temperature difference,the heat transfer coefficients revealed nonlinear characteristics with the peak values under all ethanol mass fractions of *** heat transfer coefficients decreased with increasing ethanol mass fraction of vapor.

关键词： Condensation Drop Heat transfer mini-tube

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