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Influence of Geometrical Structure on Inertial Focusing of Particle in the Microchannel

Influence of Geometrical Structure on Inertial Focusing of P...

2016年大连国际微纳流体和微流控芯片大会(2016 International Conference of Microfluidics, Nanofluidics and Lab-On-A-Chip

作者： Liang-Liang Fan Hong Zhao Qing Yan Jing Guo Liang Zhao Jiang Zhe Fuli School of Food Equipment Engineering and Science (FEES) Xi ''an Jiaotong UniversityXi ''an P.R.China State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong UniversityXi ''an P.R.China Department of Mechanical Engineering University of Akron Akron OH USA

Particles subjected to the inertial lift force will be focused in several equilibrium positions in *** to now, most research on inertial focusing of particles have been focused on the microchannel with a constant cros...

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An experimental study on flow characteristics of homogeneous and stratified debris beds 16

An experimental study on flow characteristics of homogeneous...

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16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2015

作者： Li, Liangxing Zou, Xumao Lou, Jiaojiao Li, Huixiong Lei, Xianliang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xian-ning West Road 28# Xi'an city710049 China

ISBN: (纸本)9781510811843

This paper is concerned with reducing uncertainty in quantification of debris bed coolability in a severe accident of light water reactors (LWRs). The experimental results on the flow characteristics of particulate homogeneous and stratified beds are reported here and the objective is to get an idea of how the particles bed characteristics (such as the stratified information and its hierarchical arrangement) affects its flow resistance which is crucially important to the debris bed coolability analysis. Three type beds are packed in a cylindrical test section with the inner diameter of 120 mm and the height of 600 mm. Type-1 bed is homogeneous bed packed with single size spheres. Type-2 bed is also a homogeneous bed with uniformly mixing by two sizes of spheres. Type-3 bed is the axially stratified bed which is composed of two sizes of glass spheres same as that in the Type-2 bed. Both single and two phase flow tests are carried out, the pressure gradients and its flow characteristics are measured and recorded during the tests. The results show that for gas-water co-current flow through a homogeneous bed, the predictions of Reed's model are more comparable with the measured pressure drops. For a bed packed with uniform mixture of particles, the measured pressure gradients are close to the predictions of Ergun equation with area mean diameter at low flowrate (e.g. Rep © Copyright (2015) by American Nuclcar Society All rights reserved.

关键词： Pressure drop

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Effect of groove size on heat transfer performance of loop heat pipe with flat evaporator

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2015年第3期36卷 611-614页

作者： Lü, Xiao Wei, Jin-Jia Long, Yan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

The effect of groove size on heat transfer performance of a loop heat pipe (LHP) with flat evaporator was investigated experimentally, and the comparison of two different kinds of groove size was conducted under different title angles and fluid charging ratios. The results showed that the minimum start-up heat load is same under the same conditions for two different grooves of 2 mm×1.5 mm and 1 mm×1 mm (hight × width), but the former has shorter start-up and transient times. After running steadily, the former has smaller temperature oscillation and lower operating temperature than the latter except for the fluid charging ratio of 55% and the heat load less than 150 W. With increasing heat load, the former has a smaller change in temperature than the latter and the temperature oscillation decreases. As for the heat transfer performance, the thermal resistance decreases with increasing heat load and then levels off for the two different grooves. When the LHP under horizontal position with working fluid charging ratio of 55%, a larger thermal resistance appears for the former initially, and it decreases dramatically with the increase of heat load, and the minimum value of 0.12℃/W is achieved at the heat load of 215 W. © 2015, Science Press. All right reserved.

关键词： Thermal load

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Experimental study on enrichment of low concentration coal bed methane with solar energy

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2015年第12期36卷 2637-2640页

作者： Yu, Hao-Tian Li, Na Zhou, Qu-Lan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

A large number of low concentration methane gas is emitted directly into the atmosphere during the coal production, resulting in a serious waste of energy and the greenhouse effect. Aiming at the shortcomings of conventional coal mine methane enrichment technology existed, the papar presented separation and enrichment coal mine methane with the Soret effect. The theoretical analysis proposed the main parameters of the enrichment process is the initial methane concentrations and the temperature gradient. The effect law of these parameters is studied by experiments and numerical simulations. © 2015, Science Press. All right reserved.

关键词： Coal

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The optimized design and experimental analysis of CPC-PV / T system

The optimized design and experimental analysis of CPC-PV / T...

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International Conference on Renewable power Generation, RPG 2015

作者： Chen, Haiping Wang, Chenhui Sun, Jieling Ai, Dengxin Ye, Chentao Li, Zhaohao Wei, Jinjia School of Energy Power and Mechanical Engineering National Thermal Power Engineering and Technology Research Center North China Electric Power University Beijing102206 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shanxi Province710049 China

ISBN: (纸本)9781785610400

With the CPC integrated photovoltaic / thermal (PV/T) system as the research object, this paper studies the design techniques, builds experimental platform of the system and analyzes its thermal and electrical performance. Firstly, the basic architecture parameters of CPC is designed and the key factor which influences the concentrating uniformity of CPC is found via the software named lighttools simulation so that the light distribution uniformity of PV panel is improved. Secondly, the manufacture technique of PV/T collector is designed, including the determination of the size of PV module and the external and internal dimensions of the flat cassette collector. The entire PV/T collector is manufactured by means of direct lamination. Finally, according to the manufactured CPC and PV/T, the experimental platform of CPC integrated PV/T system, whose power is 1kW, is built. The thermal-electrical performance evaluation model of the experimental platform is established. The thermal-electrical performance of the experimental platform is tested and the results show that the water temperature of the outlet can be above 45°C and the total efficiency can reach 60%.

关键词： Solar panels

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CFD study on the optimal nozzle exit position in a CO2 two-phase ejector 24

CFD study on the optimal nozzle exit position in a CO2 two-p...

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24th IIR International Congress of Refrigeration, ICR 2015

作者： He, Yang Deng, Jianqiang Zhang, Zaoxiao Zheng, Lixing State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an710049 China

ISBN: (纸本)9782362150128

The nozzle exit position (NXP) is a significant parameter for an ejector. In this work, a two dimensional (2D) homogeneous CFD model is developed to simulate the two-phase ejector used in transcritical CO2 refrigeration cycle and NXP is focused on. After model validation, the flow fields in ejectors with different NXPs are simulated and an optimal NXP is obtained. According to the numerical results, with the increase of the NXP, a higher velocity and lower pressure are achieved for the primary fluid in the suction chamber which enhances the entrainment of the secondary fluid. Oppositely, the flow area of the primary fluid at the mixer inlet increases with the NXP which reduces the secondary flow rate. A compromise between these two factors leads to the optimal NXP with the highest entrainment ratio under the same operating condition. The results are helpful to the optimal design and control of the ejector.

关键词： Carbon dioxide

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A comparative study on regulation methods for transcritical CO2 ejector expansion refrigeration system 24

A comparative study on regulation methods for transcritical ...

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24th IIR International Congress of Refrigeration, ICR 2015

作者： Zheng, Lixing Deng, Jianqiang He, Yang School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

ISBN: (纸本)9782362150128

In this paper a dynamic model of transcritical CO2 ejector expansion refrigeration cycle with two-stage evaporation (EERC-TE) is established to track the transient response of system parameter at two regulation methods which includes the vapour quality adjustment and the entrainment ratio adjustment. The effectiveness of system model is verified and the results show the predictions have a agreement with the experimental data. Based on the unit change of ejector nozzle throat area and volume flow rate of chilled water of the second evaporator, the dynamic responses of pressure in gas cooler, the first and second evaporator, mass flow rate of primary flow, entrainment ratio and vapour quality of separator inlet are compared. The regulation of ejector nozzle throat area causes relatively large system responses compared to that of chilled water flow rate of the second evaporator. This work is useful to guide system control and the improvement of system performance.

关键词： Evaporators

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Hot corrosion behavior of TP347HFG without and with external stresses in molten salts

Hot corrosion behavior of TP347HFG without and with external...

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International Conference on power engineering, ICOPE 2015

作者： Fu, Jiapeng Zhou, Qulan Li, Na Liu, Zhuhan Liu, Taisheng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Dongfang Boiler Group Corporation Limited Zigong643000 China

The hot corrosion tests of the austenitic TP347HFG in molten sulfates with and without external stresses were conducted at 700 and 750 oC. The corroded specimens of different conditions were investigated through measurements of o xide morphology, corrosion thickness and composition. Through the analysis to the corrosion specimens, we knew that the corrosion reaction of the alloy was strongly related to the formation of an oxidation progress of metallic elements. The unstressed specimens had more complex products and thicker corrosion layers than those under 20MPa external stresses at 700 and 750 oC, which meant mo re fierce corrosion behaviors. It seemed that the applied stress led to a faster formation of a continuous, dense oxides layer that protected the inner specimens fro m further corrosion reaction. Generally, the exertion of the stresses caused many micro cracks and defects in the metal. These defects acted as faster and easier diffusion paths for the Cr atoms to diffuse to the surface, and thus, promote a faster formation of the protective Cr2O3 oxide layer. © 2015 The Japan Society of Mechanical Engineers.

关键词： Austenitic stainless steel

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Effect of nozzle diameter on spray and thermal characteristics of R134a flashing spray 13

Effect of nozzle diameter on spray and thermal characteristi...

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13th International Conference on Liquid Atomization and Spray Systems, ICLASS 2015

作者： Zhou, Z.F. Wang, R. Chen, B. Wang, G.X. State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Department of Mechanical Engineering University of Akron AkronOH44325-3903 United States

Two-phase flashing spray holds a special interest in the safety area. High pressure liquids or liquefied gases accidentally released from small hole in chemical or nuclear industry can form two-phase mixtures due to the rapid decrease of pressure, resulting in injuries, fatalities, serious local pollution, etc. Besides, flashing spray has been successfully used in laser dermatology to prevent thermal injuries during recent decade. In this work, an experimental study is conducted to characterize the two-phase flashing spray in the close field of flashing occurrence and quantify the effect of nozzle diameter on the spray and thermal characteristics, using the volatile and low boiling point cryogen of R134a. From the axial and radial distributions of droplet diameter, velocity and average temperature, it is found that droplet diameter and average temperature experience rapid decline along the axial spray distance, and the velocity has acceleration near the nozzle exit due to the explosive atomization. Droplet diameter keeps almost constant except at the spray periphery, and droplet velocity decreases linearly in the radial direction. Droplet average temperature has complex variation along the radial distance depended on the axial distance. Nozzle diameter has significant effect on the spray and thermal characteristics. Larger diameter nozzle results in longer acceleration distance of droplet velocity, whereas smaller diameter nozzle causes higher decrease rate of droplet diameter and temperature near the nozzle exit. Nevertheless, nozzle diameter has little effect on the minimum droplet temperate with the same value of -60oC. The dimensional analysis indicates that the non-dimensional lateral velocity profile and the non-dimensional droplet average temperature in the spray centerline all show self-similarity. New correlations of non-dimensional droplet velocity and average temperature are proposed. © 2015 International Conference on Liquid Atomization and Spray Systems

关键词： Velocity

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FLUENT-based computation for a time-space-dependent neutron kinetics model

FLUENT-based computation for a time-space-dependent neutron ...

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2015 ANS Annual Meeting

作者： Zhang, Dalin Ge, Jian Tian, Wenxi Qiu, Suizheng School of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University No.28 Xianning West Road Xi'an710049 China

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