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第二届全球华人水动学学术会议

作者： Fan Yang Yuhang Fu Wanyu Chen Yonghua Yan Xueyan Guo Ren Dai School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering

The deformation and breakup behavior of a 2D droplet impinging on a solid cylinder was presented by using a multicomponent lattice Boltzmann method（LBM） with pseudopotential *** impact of Bond number（Bo）,surface wettability and the size of the cylinder on the behavior of the droplet were taken into *** show that the behaviors of the droplet can be classified into three types:1) staying on the top of the cylinder;2) breaking up into two daughter droplets and merging again;3)breaking up without the merging *** critical-Bond numbers(Bo and Bo) are defined to classify the three *** is found that Bo increases with the increase of contact angle,while Bo does the *** the size of the cylinder was increased,Bo increases respectively;however,Bo doesn't show such relation with the cylinder *** also shows that it is an effective way to control the evolution of the droplet by setting the wettability of the cylinder surface properly.

关键词： Multicomponent lattice Boltzmann method deformation and breakup of droplet wettability critical Bond number

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Characterization of Soot Based on Variable Laser-induced Spectroscopy

Characterization of Soot Based on Variable Laser-induced Spe...

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Progress in Electromagnetic Research Symposium

作者： Yanfeng Zhang Jun Chen Huinan Yang Mingxu Su Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering School of Energy and Power Engineering University of Shanghai for Science and Technology

ISBN: (纸本)9781509060948

Laser-induced incandescence (LII) is a non-intrusive method of measuring time-resolved soot particle volume fraction and primary particle sizes. We also can know the component by increasing the laser energy to the regime of laser-induced breakdown spectroscopy (LIBS). More model analysis and experiments should be studied to understand the LII/LIBS.

关键词： Soot laser-induced breakdown spectroscopy LASER ENERGY Pattern analysis Filament lamps primary particulates laser-induced

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A measuring method for 3-D movement of particles using single-lens dual-camera system

A measuring method for 3-D movement of particles using singl...

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IEEE International Workshop on Imaging Systems and Techniques (IST)

作者： Minhua Jia Wu Zhou Na Jin Xiaoshu Cai Institute of Particle and Two-phase Flow Measurement / Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Shanghai China

ISBN: (纸本)9781509018185

A 3-D measuring method for particle movement was established by using a single-lens dual-camera system. The light through an object-space telecentric lens was split half-and-half by a beam splitter and then are received by two CCD industrial cameras, respectively. These two image sensors have different distances from the telecentric lens. As for the same imaging particle, two images with different degrees of defocus will be captured. These two images were used to solve the ambiguous problem of 3-D particle positions. Combining with the PTV technology and the single-frame and multiple-exposure imaging method, the system can determine the magnitude and direction of 3-D velocity. The feasibility was then proved by experiments.

关键词： Atmospheric measurements Particle measurements Lenses Cameras Measurement by laser beam Velocity measurement

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Fabrication of hybrid super-wettability copper mesh with knife-likeflowers

Fabrication of hybrid super-wettability copper mesh with kni...

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第五届国际仿生工程学术大会(ICBE2016)

作者： H.X.Chen Y.Y Yan Jinliang Xu Linbin Huang The Beijing Key Laboratory on Multiphase Flow and Heat Transfer North China Electrical Power University Fluids & Thermal Engineering Research Group Faculty of EngineeringUniversity of Nottingham

The wettability of solid surfaces is very important to fundamental research and practical application. Inspired from species in nature a variety of bionic surfaces with super wettability have been fabricated by lithography, templating, plasma treatment and laser methods. Recent years, metal bionic materials used in heat transfer and their enhancement mechanism have been promising topics, for example superhydrophilic surface was used in boiling enhancement [1]dropwise condensation [2]and heat exchangers[3]and so on. But most metal superwettability surfaces used in heat transfer field were uniform while hybrid wetting substrates always were non-metal like silicon wafer. In this paper, the porous metal that involved in the hot applications was chosen as substrate. Superhydrophilic copper mesh(～0 o) and superhydrophobic copper mesh(～150 o) were fabricated by directly oxidation method and functionalization by trichloro(1 H, 1 H, 2 H, 2 H-perfluorooctyl) silane respectively, whose wettability can be interconverted by simple operation. After oxidation a layer of knife-like-flower oxide at thickness of 2μm covered the mesh lines. Closed to the substrate several knife sheets interdigitate together and disperse on the top, the gap between the knife sheets on the top of flowers is 100-200 nm. With functionalization by silane, mesh wettability converted from superhydrophilic into superhydrophobic, while, the knife-like flower layer has littler change but blunt edges. Then, a hybrid wettability mesh with inspired from Stenocara Beetle was prepared, which has circle superhydrophilic spots surrounded by hydrophobic background. The hybrid wettability mesh could be widely used in boiling enhancement, water harvesting, biological medicine and other practical applications.

关键词： copper mesh knife-like-flower hybrid wettability

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Mimicking the Stenocara Beetle——bumpy shell with hybrid wettability to harvest water by modified foam coppers

Mimicking the Stenocara Beetle——bumpy shell with hybrid we...

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第五届国际仿生工程学术大会(ICBE2016)

作者： H.X.Chen Y.Y.Yan The Beijing Key Laboratory on Multiphase Flow and Heat Transfer North China Electrical Power University Fluids & Thermal Engineering Research Group Faculty of EngineeringUniversity of Nottingham

For centuries, water has been a limited resource especially in arid regions, and nature has adapted to provide survival methods for species inhabiting. Stenocara beetles can collect water from morning fog using its bumpy shell, an array of hydrophilic bumps surrounded by hydrophobic background exactly. Dorrer et al, Lee et al and other researches studied kinds of patterned superhydrophobic and superhydrophilc surfaces to prove which bump surface has best water harvesting performance. Obviously, drainage, temperature difference, wind velocity, surface pattern et al are all key factors, but most samples in their studies are solid substrates with a layer microstructure. There are three common grounds:（1） with spraying of fluid almost condensate is blocked on the surface to form a film which weaken the effect of surface pattern to condensation process.（2） draining efficiency of condensate directly determines the performance of next generation, while, condensate mainly relies on gravity and flows away along the substrate surface at a low velocity,（3） more attention is focused on the microstructures on the surface with neglect of cooperation with macro scale of *** this paper, copper foam with the controllable pore structures is chosen to harvest water. After superhydrophilic and superhydrophobic treatments copper foam with hybrid wettability is fabricated with inspiring from the stenocara beetle. As previous reported porous metal with a superhydrophilic wettability could absorb a droplet away instantly, this can be used in the drainage system during water collection. Cooperating multi-layer cooper foams with different wettability and an independent drainage, a novel water collector is designed. When wind blows through the porous structure with less pressure decrease a droplet is generated on the surface of copper foam with certain temperature difference. Meantime, condensate is quickly sucked away by latter superhydrophilica foam then collected. At last, the eff

关键词： harvest water metal foam drainage

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Measurement of the Evaporating Liquid Film of a Urea-Water Solution Using Diode Laser Absorption Spectroscopy

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LASERS IN engineering 2016年第5-6期35卷 351-358页

作者： Yang, H-N. Guo, X-L. Su, M-X. Cai, X-S. Univ Shanghai Sci & Technol Sch Energy & Power Engn 516 Jungong Rd Shanghai 200093 Peoples R China Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer 516 Jungong Rd Shanghai 200093 Peoples R China

Liquid film thickness is an important parameter in many industrial applications. Here, a single diode laser absorption spectroscopy (DLAS) sensor for film thickness measurement of urea-water solution was developed. The wavenumber position of the employed diode laser was chosen at 6613.25 cm(-1), where the derivative of absorption coefficient with respect to concentration of urea-water solution was zero, therefore, the sensor was available for film thickness measurement of urea-water solution at different concentrations. The performance of the sensor was first validated in a calibration-tool experiment with liquid layers of known film thicknesses (100.0 to 1000.0 mm), it was found that the average deviation between the measured film thicknesses and preset values was 1.5%. Then experiments were presented for time-resolved thickness measurement of evaporating liquid films of urea-water solution on a transparent quartz plate.

关键词： Diode laser urea-water liquid film diode laser absorption spectroscopy (DLAS) thickness aqueous solution mass fraction measurement laser spectroscopy

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Free surface vortex in a rotating barrel with rods of different heights

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International Journal of Fluid Machinery and Systems 2016年第4期9卷 325-331页

作者： Zhang, Xiaoyue Zhang, Min Chen, Wanyu Yang, Fan Guo, Xueyan School of Energy and Power Engineering University of Shanghai for Science and Technology No. 516 Jungong Road Shanghai200093 China Department of Mechanical and Electrical Engineering Henan Mechanical and Electrical Engineering College No. 699 Pingyuan Road Xinxiang453003 China Key Laboratory of Flow Control and Simulation University of Shanghai for Science and Technology No. 516 Jungong Road Shanghai200093 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering No. 516 Jungong Road Shanghai200093 China

A bathtub vortex above the outlet of a rotating barrel is simulated. By analyzing the Ekman layer theory, it can be found that the main flow circulation is inversely proportional to the thickness of Ekman layer. The thicker the Ekman boundary layer, the weaker the rotational strength and the shorter of the length of gas core is. According to this law, models of barriers with rods of different heights are established. The reduction of air-core length in this air entrainment vortex and weakening the strength of rotation field were achieved. © 2016 Turbomachinery Society of Japan. All rights reserved.

关键词： Vortex flow

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Publisher's Note: Numerical investigation of the yawed wake and its effects on the downstream wind turbine [J. Renewable Sustainable Energy 8, 033303 (2016)]

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Journal of Renewable and Sustainable Energy 2016年第5期8卷

作者： Miao, Weipao Li, Chun Yang, Jun Xie, Xiaoyun School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai200093 China Laboratory of Fluid and Power Machinery Xihua University Jinniu District Sichuan610000 China Shanghai Behr Thermal Systems Co. Pudong District Shanghai201206 China

This article was originally published online on 9 June 2016 with affiliation 3 incorrectly assigned to the second author. Chun Li is not affiliated with the Lab

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Energy efficiency evaluation method for plate heat exchanger

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Kexue Tongbao/Chinese Science Bulletin 2016年第8期61卷 802-808页

作者： Zhang, Yanfeng Jiang, Chen Shou, Binan Zhou, Wenxue Bai, Bofeng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Technology Service Center CO. LTD Beijing100011 China LanZhou Guanyu Heat Transfer and Energy Saving Engineering and Technology Research CO. LTD Lanzhou730050 China

In heat exchangers, heat transfer between the cold and the hot fluid consumes pumping power. Evaluating the energy efficiency of this process scientifically and quantitatively is an urgent issue for both academic research and industrial applications, and has important significance to energy saving and emission reduction. We comprehensively analyzed the flow and heat transfer characteristics of water-water heat transfer process without phase-change in a heat exchanger, and proposed the energy efficiency index (=k/pn, k is overall heat transfer coefficient and p is flow pressure gradient). EEI reflects the inherent energy efficiency properties of a heat exchanger, which represents the overall heat transfer coefficient per equivalent flow pressure drop consumption. At a given temperature difference and fluid flow rate, for the heat exchangers with the same heat transfer area and fluid flow length, bigger EEI means a lager heat transfer rate per equivalent pumping power consumption. EEI is independent on the heat transfer area;no dependence or weak dependence on the flow velocity can be achieved by choosing the index n reasonably, indicating a good stability of EEI. Evaluation result based on national standard of heat exchanger performance test measured could represent the energy efficiency of the heat exchanger. Combined with the water-water heat transfer process without phase-change flow and heat transfer performance database of the plate heat exchangers, the value of index n and the overall EEI distribution of plate heat exchangers in industry are obtained, providing a basis for the classification of the energy efficiency of plate heat exchangers. © 2016, Science Press. All right reserved.

关键词： heat exchangers

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漂浮式风力机Spar平台结构动力响应分析

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热能动力工程 2016年第7期31卷 123-129,140页

作者：叶舟吴中旺詹培李春上海理工大学能源与动力工程学院上海200093 Shanghai City Key Laboratory on Multi-phase Flow and Heat Transfer in Power Engineering

采用有限元方法,基于Von-Mises失效理论,考虑平台结构阻尼和惯性载荷,利用ANSYS有限元软件和开源程序软件FAST分别研究了平台动态响应和结构应力。结果表明:螺旋侧板对Spar平台的自振频率没有明显影响;附加螺旋侧板可以有效减小平台在... 详细信息

采用有限元方法,基于Von-Mises失效理论,考虑平台结构阻尼和惯性载荷,利用ANSYS有限元软件和开源程序软件FAST分别研究了平台动态响应和结构应力。结果表明:螺旋侧板对Spar平台的自振频率没有明显影响;附加螺旋侧板可以有效减小平台在垂荡和纵摇方向的运动响应,但在纵荡方向上没有明显改善;螺旋侧板阻碍了海流的流动,增加了流动阻力,平台结构应力略有增加,且最大切应力约为最大等效应力的二分之一,但平台结构仍是安全的,而最大等效应力是影响平台安全稳定工作的关键。

关键词：漂浮式风力机 Spar平台结构优化强度动态响应

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