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作者： Yin, Dawei Sun, Jinjing School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Shanghai Key Laboratory of Power Energy in Multiphase Flow and Heat Transfer Shanghai200093 China

As observation and research on nature deepen, bionic and hydrophobic surface drag reduction are gaining increasing popularity among researchers. The application of bionic principles and hydrophobic surface technologies in the field of fluid dynamics has opened up new avenues for enhancing the performance of various engineering systems, including vertical-axis tidal turbines (VATTs). By mimicking the natural mechanisms observed in certain species, such as the lotus effect, researchers have been able to develop superhydrophobic surfaces (SHS) that significantly reduce drag in fluid ***, SHS have been applied uniformly across the entire surface of an airfoil. However, this study takes a more nuanced approach by investigating the impact of SHS application at different positions on the airfoil. Through numerical simulations, the study explores how varying the distribution of SHS can influence the power coefficient (Cp), a key performance metric for VATTs . The findings from the study are quite revealing. At a tip speed ratio (TSR) of 1.68, the study observes that applying SHS to 30% of the chord length near the leading edge of the airfoil yields the maximum relative power coefficient benefit, with an increase of up to 34.8%. This suggests that strategic placement of SHS can lead to significant performance improvements without the need for uniform application, which could potentially reduce material costs and maintenance requirements. Moreover, the study also finds that applying SHS only on the inner surface of the VATT can result in a 32% increase in the power coefficient. This indicates that the inner side of the airfoil, which experiences the higher pressure side of the fluid flow, is particularly sensitive to the drag reduction effects of SHS. The leading edge of the airfoil is another critical area where SHS application can have a substantial impact. The leading edge is the first point of contact between the airfoil and the fluid, and any reduc

关键词： Drag reduction

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An optimal design of the widths of heat affect zone, fusion zone, and near interface zone in a dissimilar metal welded joint

Material Design and Processing Communications

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Material Design and Processing Communications 2020年第5期2卷

作者： Guo, Guoliang Yang, Jie Wang, Lei Liu, Guiqiu Zhang, Baozhong Zhang, Sihan 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 Shanghai China Consumer Appliances Centre Shandong Product Quality Inspection Research Institute Shandong China

The optimal design of the dissimilar metal welded joint is a valuable research issue, whether optimize the material, processing technology, dimension, or anything else. The fracture behavior of the dissimilar metal welded joint have been found affected by the widths of heat affect zone, fusion zone, and near interface zone. In this study, the optimal design of the widths of heat affect zone, fusion zone, and near interface zone in the dissimilar metal welded joint was further studied systematically. Firstly, a dissimilar metal welded joint, which used in the nuclear power plants with either heat affect zone crack or fusion zone crack, was selected, and a width mismatch coefficient MW was defined. In addition, the crack propagation paths and J-resistance curves of the dissimilar metal welded joints under different MW induced by the widths of heat affect zone, fusion zone, and near interface zone were calculated. Based on the obtained results, the widths of heat affect zone, fusion zone, and near interface zone were optimized. This study will provide support for the design of the dissimilar metal welded joint and is significant to the structure integrity assessment of the nuclear power plants. © 2019 John Wiley & Sons, Ltd.

关键词： Nuclear fuels

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Investigation of influencing factors of limit air-to-water ratio of cooling tower

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2011年第SUPPL. 1期32卷 134-137页

作者： Jia, Ming-Xiao Yan, Jun-Jie Ning, Tao Liu, Ming Li, Gen Zheng, Shan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Experimental investigation was conducted on the cooling tower test device using the outlet water temperature as evaluation index. The experimental results indicated that: the outlet water temperature decreased with the increase of air-to-water ratio, but the trend was decreasing gradually. The limit air-to-water ratio existed during the decrease of outlet water temperature. The outlet water temperature had little change when the air-to-water ratio was up to this value. The limit air-to-water ratio decreased with the increase of inlet air dry bulb temperature and wet bulb temperature, and increased with the increase of inlet water temperature. And the limit air-to-water ratio decreased with the increase of the flow rate of circulating water. Such conclusions may be advantageously used in guiding the design and operation of cooling tower.

关键词： Cooling towers

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Liquid kinematic viscosity of the binary mixtures of methanol and castor oil

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2006年第SUPPL. 1期27卷 79-81页

作者： Meng, Xian-Yang Wu, Jiang-Tao Liu, Zhi-Gang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

The liquid kinematic viscosity of the binary mixtures of methanol and castor oil are reported over the temperature range from 243~353 K made with a calibrated Ubbelohde-type capillary viscometer. The total experimental uncertainty is less than 1.06%. In addition, the results were correlated as a function of temperature as the kinematic viscosity equation of the binary mixtures. The absolute average deviation and the maximum deviation of the experimental results from the correlated equation are 1.11% and 3.31%, respectively.

关键词： Castor oil Kinematic viscosity Liquid mixtures Methanol

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Application of opposed water spray cooling in an high-temperature entrained-flow coal gasifier

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2009年第6期30卷 984-986页

作者： Liu, Pei-Yao Chen, Qiu-Yang Zeng, Min Wang, Qiu-Wang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

A series of chemical reactions happen in the coal gasifier and as a result, high temperature syngas is obtained which contains a lot of solid granules. The high-temperature syngas must be cooled, because it can not be utilized directly. The opposed water spray cooling is not only effective, but also could dedust the syngas. In the present study, the CFD technique is used to investigate the effect of the opposed spray cooling in a gasifier. The Euler-Lagrange method is applied to deal with the syngas and the water droplets respectively. A non-dimensional parameter Temperature Non-uniform Factor (TNF) is defined to confirm the height of the cooling section. The simulated results match the designed data well. If water droplets with small diameters are used, the single-stage water spray cooling is more economic than the two-stage water spray cooling.

关键词： Computational fluid dynamics

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Effect of Pb2+ doping on band gap of Cd1-xZexS solid solution and photocatalytic water splitting activity

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Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 2008年第1期42卷 110-113页

作者： Xing, Chanjuan Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Pb2+ doped Cd0.2Zn0.8S and Cd0.8Zn0.2S were prepared with coprecipitation method. The results indicate that the valence band of Cd0.2Zn0.8S solid solution with wide band gap is heightened by the Pb 6s level hybridization with valence band, and the photocatalytical hydrogen evolution ability is improved. When Pb2+ is doped in Cd0.8Zn0.2S solid solution with narrow band gap, it acts as a recombination center and is unable to improve water splitting activity of the catalyst. So the doping of Pb2+ is effective only for the semiconductor with wide band gap.

关键词： Photocatalysis

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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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New method of preparing solid solution ZnS-CuInS2 and its activity of photocatalytic splitting water for hydrogen production

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology 2006年第SUPPL. 2期28卷 240-244页

作者： Guo, Peng-Hui Guo, Lie-Jin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Synthesis of solid solution ZnS-CuInS2 has been demonstrated. The crystallinity and stability of catalysts were highly improved by the combination of two usual ways used for improving the crystallinity of materials-calcination at high temperature or hydrothermal, so was the activity of photocatalytic splitting water for hydrogen production. The catalysts were characterized by XRD, BET, SEM, XRF and UV-Vis. The results of the photocatalytic hydrogen production showed that the catalyst had the highest stability and activity by H2S inflowing to the metal cation solution following with calcination and hydrothermal. After the catalyst was loaded with 3% Pt, the velocity of hydrogen production has been further improved to 127 μmol/h. And its apparent quantum efficiency at 420 nm was up to 4.43%.

关键词： Photocatalytic hydrogen production Preparation ZnS-CuInS2 solid solution

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Shape of isolated bubble in intermittent flows in horizontal straight tube

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2006年第3期27卷 433-436页

作者： Gu, Han-Yang Guo, Lie-Jin Zhang, Xi-Min Wang, Zhi-Wei State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

An experimental study of the shape of a single bubble similar to those observed in horizontal plug/slug flow was performed by visual observation and conductance probes in this paper. The results show that the shape of the nose and body of bubble depends on the Froude number defined by gas/liquid mixture velocity, whereas the shape of the back region of bubble depends on both the Froude number and bubble length. The photographic pictures show that the motion of bubble is related to the characteristics of bubble head and the transition from plug flow to slug flow occurs when the back of the bubble changes from staircase to hydraulic jump pattern with increasing the Froude number and bubble length.

关键词： Bubble shape flow pattern transition Plug flow Slug flow

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Effect of rotation on the flow and heat transfer performance of blade leading edge with impingement holes

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2008年第8期29卷 1397-1399页

作者： Zhang, Da-Hai Zeng, Min Luo, Lai-Qin Wang, Qiu-Wang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

The numerical simulation technique was employed to study the flow and heat transfer performance of the rotating cooling channel with feed chamber and impingement chamber. The discharge coefficient of the impingement holes and the average Nusselt number of the impingement target surface in the blade leading edge in rotating were obtained. The result shows that the Coriolis force induced by the rotation effect can change the discharge coefficient of the impingement holes. With the increase of the rotating speed, the Coriolis force effect becomes more obvious. The discharge coefficient increases with the increase of rotating Reynolds number and outflow ratio, and decreases with the increase of the inlet Reynolds number. The influence of the rotation on the average Nusselt number of the impingement target surface is not obvious. With the increase of the rotating speed, Nusselt number increases slightly only at high rotating speed.

关键词： Rotation

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