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7th International Conference on Fluid Mechanics(ICFM7)

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

Oil spills on the ocean are usually serious marine disasters with tremendous economic loss and environmental *** the spreading of the leaked oil is of great significance to the quick responses and engineering decision... 详细信息

关键词： Simulation of the spread of oil slicks by a multiphase particle method

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An Efficient Compound Parabolic Concentrator for Concentrating Solar Photovoltaic-Thermal Hybrid System

An Efficient Compound Parabolic Concentrator for Concentrati...

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2015欧亚经济论坛-2015第五届国际新能源产业大会

作者： Jinjia Wei State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Solar energy devices/systems are required to have high efficiency at low costs to be competitive with conventional energy *** promising approach is to combine a concentrating photovoltaic cell with a solar thermal collector,referred to as concentrating photovoltaic-thermal hybrid system（PV/T）.The PV/T system provides both electricity and usable heat which can enhance total efficiency of the *** concentrating efficiency,photoelectric and light-thermal conversion efficiency are key factors affecting the performance of concentrating photovoltaic-thermal hybrid *** proposed a new design method of integrated compound parabolic collector（CPC） the uniformity and economy of which become much *** validity of this new design method was verified by testing this prototype of *** to accurate mathematical model,a plate-type PV/T was manufactured by laminating the polycrystaU PV cells connected in series on the flate cooling water channel made of aUuminum *** performance of the system was measured under total solar radiation intensity of 810 W/mwith scattering light proportion of 15%.The results showed a total efficiency of above 62%（50%thermal efficiency plus 12%electrical efficiency）.

关键词： An Efficient Compound Parabolic Concentrator for Concentrating Solar Photovoltaic-Thermal Hybrid System Hybrid

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A three-dimensional numerical analysis of platelet flow in a carotid artery

A three-dimensional numerical analysis of platelet flow in a...

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7th International Conference on Fluid Mechanics(ICFM7)

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

Human carotid artery is bifurcated into two arteries in the neck,supplying blood to the brain and facial *** plaque tends to occur and develop in carotid artery sinus,where stenoses and other lesions can cause cerebral *** is accepted that the chronic exposure of the endothelial cells to lower wall shear stress(WSS)is associated with thickening of the vessel wall and development of atherosclerotic ***,platelet in blood is also accepted to play es-

关键词： profile A three-dimensional numerical analysis of platelet flow in a carotid artery WSS

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Investigation on heat transfer and hydraulic resistance characteristics of supercritical fluids in tubes

Investigation on heat transfer and hydraulic resistance char...

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International Conference on power engineering, ICOPE 2015

作者： Li, Lin Chenhao, Fan Hongzhi, Li Hongfang, Gu Benan, Cai Haijun, Wang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China National Engineering Research Center of Clean Coal Combustion Xi'an Thermal Power Research Institute Co. Ltd. Xi'an710032 China

Supercritical fluids have a wide range of applications in ultra-supercritical power units, water cooled reactors and aerospace fields with a good performance in flowing and heat transfer. When medium works in large specific-heat region, a dramatic change in physical properties of fluids occurs, resulting in a complicated change about the flow structure in tubes. In the present paper, the main conclusions are: At supercritical pressure, when the water works in large specific-heat region, the frictional resistance coefficient values decrease sharply, leading to a lower friction pressure drop and a smaller proportion in total pressure drop;simultaneously acceleration pressure drop values gradually increase. At low heat flux, the heat transfer coefficients are in good proportions to acceleration resistance coefficients. An appropriate increase in heat flux could effectively enhance the heat transfer coefficients. At high heat flux, being accompanied with heat transfer deterioration, a big velocity and viscosity gradient difference exist and laminarzation phenomenon occurs at the same time in tubes. The heat transfer mechanisms of supercritical water has been analyzed in this paper. Whether the heat transfer is improved or deteriorated primarily depends on the extent of the difference of physical properties of fluids in different radial positions. © 2015 The Japan Society of Mechanical Engineers.

关键词： Pressure drop

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Layer assignment and arrangement optimization for multi-stream plate-fin heat exchanger design 24

Layer assignment and arrangement optimization for multi-stre...

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24th IIR International Congress of Refrigeration, ICR 2015

作者： Wang, Zhe Li, Yanzhong Institute of Refrigeration and Cryogenics Xi'an Jiaotong University No.28 Xianning West Road Xi'an Shaanxi710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an710049 China

ISBN: (纸本)9782362150128

The design of layer assignment and arrangement still remains an obstacle for optimizing the performance of the multi-stream plate-fin heat exchangers. A novel layer assignment and arrangement modelling and optimization method are proposed in this paper. It is a combination method of the equipartition of entropy production and the balance of local heat load, by means of which the pressure drop rise and heat transfer performance drop caused by inappropriate layer assignment and arrangement could be reduced to a large extent. The specific entropy generation rates of heat transfer and fluid friction are adopted as the dual objective functions and simultaneously minimized. This model exhibits a good robustness and high efficiency when used to design main heat exchanger in air separation plants, and simultaneity optimizes the plate fin configurations and layer arrangement.

关键词： Entropy

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Effiects of surface roughness on oil-water-solid three-phase contact line

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2016年第9期37卷 1901-1905页

作者： Zheng, Wen-Xiu Sun, Cheng-Zhen Xiong, Tao Lü, Xiao-Ming Bai, Bo-Feng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Frist Gas Production Factory PetroChina Xinjiang Oilfield Branch Company Karamay834000 China

We established a dodecane-water-graphite system from molecular dynamics insight. The effiects of surface roughness on the three-phase contact line are studied from the aspects of the microscopic contact angle, adsorption property of water and oil molecules and adsorption energy of water molecules. The results show that adsorption intensity is weaker with the existence of roughness, which causes a larger contact angle when surface in water side has raised structure and a smaller contact angle when surface in oil side has raised structure. Oil molecules near solid surface exhibit a layer-by-layer distribution and roughness has little effiect on it. The existence of roughness weakens the orientation of water molecules, which results in weaker adsorption and stability. © 2016, Science Press. All right reserved.

关键词： Molecular dynamics

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Sensitive cesium measurement in liquid sample using low-pressure laser-induced breakdown spectroscopy

Sensitive cesium measurement in liquid sample using low-pres...

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作者： Wang, Zhen Zhen Yan, Jun Jie Liu, Ji Ping Deguchi, Yoshihiro Katsumori, Shunpei Ikutomo, Akihiro State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an710049 China Graduate School of Advanced Technology and Science University of Tokushima Tokushima770-8501 Japan Moe Key Laboratory of Thermo-Fluid Science and Engineering Xi'An Jiaotong University Xi'an710049 China

The environmental pollution by trace heavy metals is a severe problem for the environment and human health. In this paper, the liquid jet of CsNO3 solution employed was introduced to the measurement chamber and detected using laser-induced breakdown spectroscopy (LIBS) directly at low pressure to determine the detection features of trace Cs element in liquid. The distinct and round plasma can be acquired when reducing the pressure. The interaction between the plasma core of the liquid jet and the surrounding gas can be controlled to enhance Cs detection ability. Cs emission was mainly in the surrounding area in the plasma. The influences of laser focal point and plasma measurement area on the measured signals were studied under low-pressure condition. When employing the defocus mode and varying the measurement area within a certain range, Cs signal and the signal-to-background ratio were improved. Cs detection limit can reach to 22.8 ppb (3σ/ms) at pressure of 26 kPa in this paper. According to the discussion, the detection limit will be enhanced when improving the experimental conditions using this method, which shows the great application potential of liquid sample measurement. © 2015 Elsevier B.V. All rights reserved.

关键词： Laser induced breakdown spectroscopy

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Analysis of subcooled boiling in PWR rod bundle channel

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Yuanzineng Kexue Jishu/Atomic Energy Science and Technology 2015年第9期49卷 1579-1585页

作者： Zhang, Rui Gan, Fu-Jun Zuo, Qiao-Lin Tian, Wen-Xi Su, Guang-Hui Qiu, Sui-Zheng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Shanghai Nuclear Engineering Research & Design Institute Shanghai200233 China

The RPI (Rensselaer Polytechnic Institute) wall boiling model, embedded in the context of two-fluid model of Fluent14.5, was applied to simulate subcooled boiling in core fuel bundle channel with mixing vanes and space grid. The subcooled boiling key parameters including flow field, temperature field and void fraction distribution were obtained. The analysis of the effect of mixing vanes and space grid on flow channel thermal-hydraulic characteristics was conducted. It is shown that the existence of space grid can cause a large pressure drop, and mixing vanes have a great influence on the key parameters of flow field and temperature field. The results of RPI model show a good agreement with Bartolemei experiment data. ©, 2015, Atomic Energy Press. All right reserved.

关键词： flow fields

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Analysis of fouling characteristic in enhanced tubes using multiple heat and mass transfer analogies

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Chinese Journal of Chemical engineering 2015年第11期23卷 1881-1887页

作者：王泽鹏李冠球徐进良魏进家曾军娄德仓李蔚 College of Electromechanical Engineering Qingdao University of Science and Technology College of Energy Engineering Zhejiang University School of Energy Powerand Mechanical EngineeringNorth China Electric Power University State Key Laboratory of Multiphase Flow in School Energy and Power Engineering of Xi'an Jiaotong University China Gas Turbine Establishment 6 Xin-Jun Road

This paper provides a comprehensive analysis on cooling tower fouling data taken from seven 15.54 mm I.D. helically ribbed, copper tubes and a plain tube at Re = 16000. There are two key processes during fouling formation： fouling deposition and fouling removal, which can be determined by mass transfer and fluid friction respectively. The mass transfer coefficient can be calculated through three analogies： Prandtl analogy, VonKarman analogy, and Chilton-Colburn analogy. Based on our analyses, Von-Karman analogy is the optimized analogy, which can well predict the formation of cooling tower fouling. Series of semi-theoretical fouling correlations as a function of the product of area indexes and efficiency indexes were developed, which can be applicable to different internally ribbed geometries. The correlations can be directly used to assess the fouling ootential of enhanced tubes in actual coolinu tower water situations.

关键词： FoulingEnhanced tubeTurbulent flowMass transfer coefficientCooling tower water

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1D Model to Predict Ejector Performance at Critical and Sub-critical Operation in the Refrigeration System

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Energy Procedia 2015年 75卷 1477-1483页

作者： Chaoyin Shi Huiqiang Chen Weixiong Chen Shuangping Zhang Daotong Chong Junjie Yan State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an Shaanxi 710049 P.R. China

A new 1D model using the real gas property is proposed to predict ejector performance at critical and sub-critical operational modes, while most previous 1D models usually used the ideal gas property and only predicted ejector performance at critical mode operation. Constant pressure mixing is assumed to occur inside the constant area section of the ejector at critical and sub-critical mode operation, and the effectiveness of the model is verified against experimental data. The results show that the proposed model accurately predicts ejector performance over all ranges of operation. The 1D model is a useful tool for predicting ejector performance within larger refrigeration cycle models.

关键词： Ejector 1D model critical mode sub-critical mode

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