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Study on Venturi nozzle for gas-liquid two-phase flow metering

Journal of Harbin Institute of Technology(New Series) 2012年第1期19卷 107-110页

作者：梁法春张修刚王栋林宗虎 College of Pipeline and Civil Engineering China University of Petroleum State Key Lab of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Experiments were carried out to study gas-liquid two-phase flow through a horizontally mounted Venturi nozzle. The inner diameter of pipe is 25 mm and the throat diameter of Venturi nozzle is 5. 1 mm. The pressure difference and pressure loss across the nozzle were measured. It was found that the degree of pressure fluctuation strongly depends on the gas quality. However,the relationship between the standard deviation of pressure difference and the gas quality is not monotonous. Multiple solutions may occur when the relationship was used to determine gas quality. On the other hand,the standard deviation of pressure loss was found to be monotonously correlated to X. This phenomenon was applied to measured gas quality. Also a modified Lin's equation is proposed to calculate the two-phase flow rate. The experimental measurements agree well with the predicted values.

关键词： two-phase flow Venturi nozzle flow measurement

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Improved photocatalytic H2 evolution from inorganic/organic sacrificial solution over Ni-doped (CuIn)0.2Zn1.6S 2 photocatalysts

Improved photocatalytic H2 evolution from inorganic/organic ...

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2011 MRS Spring Meeting

作者： Zhang, Xianghui Jing, Dengwei Guo, Liejin State Key Lab of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

ISBN: (纸本)9781618395238

The Ni-doped (CuIn)0.2Zn1.6S2 photocatalysts were prepared via a two-step ultrasonic-hydrothermal method under an environmental-friendly condition. XRD pattern profiles suggested that Ni2+ successfully doped into (CuIn)0.2Zn 1.6S2 lattice. UV-Vis spectra indicated that the optical properties of the photocatalysts greatly depended on the amount of Ni doped. SEM images show that the samples were microspheres. The microsphere structures were gradually damaged with the increment of Ni doping amount. The photoactivity of (CuIn)0.2Zn1.6S2 was enhanced when Ni 2+ was doped into the crystal structure. The H2 evolution performance over the prepared samples from inorganic/organic sacrificial solution was systematic investigated. © 2011 Materials Research Society.

关键词： Microspheres

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Improved Photocatalytic H 2 Evolution from Inorganic/Organic Sacrificial Solution over Ni-Doped (CuIn) 0.2 Zn 1.6 S 2 Photocatalysts

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MRS Online Proceedings Library 2011年第1期1326卷 1-6页

作者： Xianghui Zhang Dengwei Jing Liejin Guo State Key Lab of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an PR China

The Ni-doped (CuIn)0.2Zn1.6S2 photocatalysts were prepared via a two-step ultrasonic-hydrothermal method under an environmental-friendly condition. XRD pattern profiles suggested that Ni2+ successfully doped into (CuIn)0.2Zn1.6S2 lattice. UV-Vis spectra indicated that the optical properties of the photocatalysts greatly depended on the amount of Ni doped. SEM images show that the samples were microspheres. The microsphere structures were gradually damaged with the increment of Ni doping amount. The photoactivity of (CuIn)0.2Zn1.6S2 was enhanced when Ni2+ was doped into the crystal structure. The H2 evolution performance over the prepared samples from inorganic/organic sacrificial solution was systematic investigated.

关键词： catalytic energy generation hydrogenation

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Research on the Hydrodynamic Characteristics and Metal Temperature Distribution in Spiral tube Water Wall of an Ultra Supercritical Boiler

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AIP Conference Proceedings 2010年第1期1207卷 199-204页

作者： Weijing Zhang Dong Yang Jie Pan Xu Zhou State Key Lab of Multiphase Flow in Power Engineering Xi’an Jiaotong University China

On the basis of a 350 MW supercritical pressure OTSC boiler, established the mathematical model for the circulation loop flow and grid pressure in a complex flow network system, and an iteration method was used to solve the nonlinear equations. The water wall flow distribution and temperature profile of the boiler were computed. The results show that the flow difference and heat difference are small in spiral tube water wall at BMCR, 75%BMCR load and 30%BMCR load. The metal temperatures are all in the range of allowable range, and the operation of boil is safe and reliable.

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Kramers' problem and the Knudsen minimum: A theoretical analysis using a linearized 26-moment approach

Kramers' problem and the Knudsen minimum: A theoretical anal...

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作者： Gu, Xiao-Jun Emerson, David R. Tang, Gui-Hua Computational Science and Engineering Department STFC Daresbury Laboratory Warrington WA4 4AD United Kingdom School of Energy and Power Engineering State Key Lab of Multiphase Flow Xi'An Jiaotong University Xi'an 710049 China

A set of linearized 26 moment equations, along with their wall boundary conditions, are derived and used to study low-speed gas flows dominated by Knudsen layers. Analytical solutions are obtained for Kramers' defect velocity and the velocity-slip coefficient. These results are compared to the numerical solution of the BGK kinetic equation. From the analysis, a new effective viscosity model for the Navier-Stokes equations is proposed. In addition, an analytical expression for the velocity field in planar pressure-driven Poiseuille flow is derived. The mass flow rate obtained from integrating the velocity profile shows good agreement with the results from the numerical solution of the linearized Boltzmann equation. These results are good for Knudsen numbers up to 3 and for a wide range of accommodation coefficients. The Knudsen minimum phenomenon is also well captured by the present linearized 26-moment equations. © 2009 Springer-Verlag.

关键词： Method of moments

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Clogging failure in microfilter for blood cell separation and Its novel improvements tao dong

Clogging failure in microfilter for blood cell separation an...

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2009 16th IEEE International Symposium on the Physical and Failure Analysis of Integrated Circuits, IPFA 2009

作者： Yang, Zhaochu Egeland, Eirik Bentzen Karlsen, Frank Jakobsen, Henrik Norwegian Center of Expertise on Micro- and Nanotechnology Vestfold University College I.M.S.T./R.I. Norway State Key Lab. of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China NorChipTM A.S. Industriveien 8 N-3490 Klokkarstra Norway

ISBN: (纸本)9781424439102

Clogging failure is common for microfilter utilizing the flat membrane structure. To reduce clogging failure in microfilters, the turbine blade-like micropillar is introduced in microfilter design. Two improved cross-flow microfilter designs employing the blade-like micropillar barrier are presented, one with varied cross-section channels, and the other with Archimedes' spiral channels. Analogy experimental-data based simulations show that the two aforementioned novel microfilters have good filtrating efficiency and fantastic anti-clogging characteristics. and the commercial value of the turbine blade-like barriers is affirmed by the industry Partners. © 2009 IEEE.

关键词： Turbomachine blades

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Pirani gauge based hermeticity monitoring for un-cooled micro bolometer array

Pirani gauge based hermeticity monitoring for un-cooled micr...

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2009 16th IEEE International Symposium on the Physical and Failure Analysis of Integrated Circuits, IPFA 2009

作者： Tao, Dong Bin, Xiao Anders, Elfving Zhaochu, Yang Nhut, Tran-Minh Einar, Halvorsen Nils, Høivik Norwegian Center of Expertise on Micro- and Nanotechnology Vestfold University College I.M.S.T./R.I. Tønsberg Norway SensoNor AS Knudsrødveien 7 N-3192 Horten Norway State Key Lab of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

ISBN: (纸本)9781424439102

This paper presents a novel method to analyze the thermal conductance under vacuum environment for MEMS devices. The Si/Ge-based Pirani gauge introduced is developed for monitoring the package hermeticity of MEMS Bolometer array, which has the total same structure as the single bolometer pixel for the characteristic of functional material. Meanwhile the 'Extended Fourier's Law' is verified by free molecular theory and is applied into the thermal analysis of the micro-structure under the pressure below 100Pa. Thermal interaction between Focus Plane Arrays (FPAs) and Pirani gauge is checked to guarantee the normal performance as the influence from each side are under 2X lO-3K, which is acceptable for the products. This design can save the cost in fabrication significantly due to no extra process flow. The commercial value is affirmed by industry partner. ©2009 IEEE.

关键词： Bolometers

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Study in steam-water two-phase flow heat transfer at high mass velocity of flow in vertical helical coiled tube

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2008年第3期29卷 423-428页

作者： Guo, Meng Zhao, Liang Mao, Yu-Fei Zhen, Fei-Qiang Zhang, Wen-Bin Guo, Lie-Jin Peng, Xiao-Feng State Key Lab. of Multiphase Flow in Power Engineering Xi'an 710049 China

Experiments were conducted to further understand the heat transfer in two-phase flow in vertical helically-coiled tubes. The experiments covered a wide range of pressure 8.0-15.0 MPa, mass flow rate 2500-4000 kg/(m2s), heat flux 200-800 kW/m2. The experimental segment is 2.335 meter long and made by φ14 × 2 mm steel tube. The diameter ratio D/d is 30.1. Through analyzing the influence of heat flux, mass velocity on average heat transfer coefficient, we acknowledge the activities of nucleate boiling and forced convection two mechanism on steam-water two-phase heat transfer in helical coils tubes at high mass flow rate. The average and local heat transfer coefficient correlations were obtained. At high mass flow rate conditions, the effect of heat transfer in the steam-water two-phase flow in helically coils is inclined to that of straight tube at same conditions and the results are compared.

关键词： Heat exchangers

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Highly accurate meshless method for convection-diffusion problems

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2008年第9期29卷 1561-1563页

作者： Wu, Xue-Hong Li, Zeng-Yao Ma, Liang-Dong Tao, Wen-Quan State Key Lab. of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Meshless local Petrov-Galerkin method (MLPG) as a new computational method has been developed in recent years, which disposes a group of scatter points in the computational domain and construct the interpolation function through these nodes. The Smith-Hutton problem was selected as the demonstrated test problem and solved by the MLPG. The results of the MLPG method were compared with the results of finite volume method with high order scheme. The results indicate that the MLPG method is a highly accurate numerical method and can deal effectively with high Pe number fluid flow problems.

关键词： Finite volume method

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Hydrogen production from co-gasification of coal and biomass in supercritical water by continuous flow thermal-catalytic reaction system

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中国高等学校学术文摘·能源与动力工程 2007年第3期1卷 327-330页

作者： YAN Qiuhui GUO Liejin LIANG Xing ZHANG Ximin State Key Lab of Multiphase Flow in Power and Engineering Xi'an Jiaotong UniversityXi'an 710049China School of Environmental and Municipal Engineering Xi'an University of Architecture and TechnologyXi'an 710055China State Key Lab of Multiphase Flow in Power and Engineering Xi'an Jiaotong UniversityXi'an 710049China

Hydrogen is a clean energy *** abundant coal sources and green biomass energy into hydrogen effectively and without any pollution promotes environmental *** co-gasification performance of coal and a model compound of biomass,carboxymethylcellulose (CMC)in supercritical water (SCW),were investigated *** influences of temperature,pressure and concentration on hydrogen production from co-gasification of coal and CMC in SCW under the given conditions (20-25 MPa,650℃,15-30 s) are discussed in *** experimental results show that H2,CO2 and CH4 are the main gas products,and the molar fraction of hydrogen reaches in excess of 60%.The higher pressure and higher CMC content facilitate hydrogen production;production is decreased remarkably given a longer residence time.

关键词： hydrogen production coal CMC supercritical water co-gasification

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