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9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017

作者： Zhang, M. Patyal, A. Fogla, N. Wang, J.H. Huang, Z.H. Matalon, M. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Department of Mechanical Science and Engineering University of Illinois at Urbana-Champaign UrbanaIL61801 United States

The effect of varying turbulence intensities on the flame brush thickness is investigated numerically using a hybrid Navier-Stokes/front-tracking methodology in the context of the hydrodynamic theory. Two configurations, namely planar and Bunsen, are chosen with the latter used for direct comparison with experimental OH-PLIF Bunsen flame images. The Darrieus-Landau influences are controlled through the mixture Markstein length and the flame brush is analyzed under two regimes, sub- and supercritical based on the absence/presence of the hydrodynamic instability. In the planar configuration at low intensities, the sub-critical flame brush retains its near flat shape, while the super-critical flame brush forms a highly corrugated structure reminiscent of the cusped-like flames that result in the laminar setting. With increasing turbulence levels, these effects start to gradually diminish as the flame becomes dominated by velocity fluctuations arising from the turbulent field, finally leading to nearly identical behavior in both regimes for very high intensities. Unlike the planar flame, the sub-critical Bunsen flame surface is dominated by large wrinkles with a more rounded shape while the super-critical flame highlights the formation of cusp-like structures on its surface. Numerical verification of the Bunsen flame brush thickness shows a good qualitative match with experimental tests for turbulent CH4/air flames. The good agreement indicates the qualitative prediction capabilities of the hydrodynamic model. Copyright © 2017 by the Japan Society of Mechanical Engineers.

关键词： Navier Stokes equations

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Experimental study on heat transfer to supercritical CO2 flowing in vertical upward tube at medium mass flux

Experimental study on heat transfer to supercritical CO2 flo...

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ASME 2017 Nuclear Forum, NUCLRF 2017, collocated with the ASME 2017 power Conference Joint with ICOPE 2017, the ASME 2017 11th International Conference on Energy Sustainability, and the ASME 2017 15th International Conference on Fuel Cell Science, engineering and Technology

作者： Zhang, Qian Li, Huixiong Kong, Xiangfei Zhang, Jun Lei, Xianliang Zhang, Weiqiang State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi'anShaanxi China North Carolina State University United States Burlington Laboratory 3144 North Carolina State University RaleighNC27607 United States

ISBN: (纸本)9780791840597

An experimental study was performed on heat transfer characteristics of supercritical pressure CO2 (SC-CO2) flowing at medium mass flux conditions in a vertically-upward tube of 16 mm inner diameter at the Heat Transfer and flow test loop of Supercritical CO2 (HTF-SCO2) in Xi’an Jiaotong University. Experimental parameters included the pressure ranging from 7.5 to10.5 MPa, the mass flux of 400-600 kg/m2s, and the heat flux of 20-100 kW/m2. Based on the experimental data, effects of mass flux, heat flux and operation pressure on heat transfer characteristics of SC-CO2 were thoroughly discussed. With the decrease of mass flux and increase of heat flux, heat transfer characteristics of SC-CO2 becomes worse and worse. The wall temperature rises to high levels with the occurrence of a wall temperature peak and the wall temperature peak also rises remarkably with the decrease in mass flux and increase in heat flux. Especially, effect of pressures on the heat transfer of SC-CO2 was found to be quite different from that previously reported in literature. When the heat flux is low (such as 30 kW/m2), the HTD was diminished with the increase in pressures, but when the heat flux is up to 50 kW/m2, the HTD is surprisingly intensified by the increase of pressure. The buoyancy effect was considered to explain this distinct influence of pressure on the heat transfer of SC-CO2 by employed a non-dimensional parameter Bu. With the increase of pressure, buoyancy effect was diminished owing to the decrease of density difference between fluids near the wall and the center. When heat flux was lower, the Bu was located between 5×10-6 and 10-4, where buoyancy effect impaired heat transfer, so the heat transfer coefficient increased by rising pressure. But when heat flux was larger, the Bu was above 10-4, where buoyancy effect began to enhance heat transfer, as a result, the heat transfer coefficient was reduced by weakened buoyancy effect because of the increase of pressure (CSPE). Copyrig

关键词： Heat flux

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Influence of Oxy-fuel Atmosphere on Microscopic Physical-Chemical Properties of High-alkali Ash at Softening Temperature

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Energy Procedia 2017年 142卷 3240-3243页

作者： Chang’an Wang Hanqing Li Chenzhao Zhu Tao Han Yinhe Liu Lei Deng Defu Che State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an 710049 China

The utilization of high-alkali coals in Zhundong coalfield with oxy-fuel combustion technology has a great potential, however, the ash fusion properties of high-alkali coals are still unclear. Here, we studied the influence of oxy-fuel atmosphere on the microscopic properties of high-sodium ash. The change from air to oxy-fuel condition has a negligible influence on ash fusion temperatures, but exhibits certain impact on physical-chemical properties of high-alkali ash. Oxygen content presents a primary effect on the microscopic morphology of ash at softening temperature.

关键词： high-alkali coal oxy-fuel combustion CO 2 capture microscopic properties SEM

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Excess thermodynamic properties and FTIR studies of binary of 1, 3-dichlorobenzene with alkyl acetates (C1–C5) at different temperatures

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Chemical Data Collections 2020年 29卷

作者： R. Raju S. Ravikumar R. Gerald Arokiaraj S. Karlapudi K. Sivakumar V. Pandiyan Department of Physics Nehru Memorial College (Autonoums) Puthanampatti 621 007Tamil Nadu India. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi 710049 P. R. China. Department of Chemistry S.V.Arts Degree & P.G.College (T.T.D'S) Tirupati 517502 A.P India

Densities ( ρ ) and speed of sound ( u ) have been reported for the binary mixtures containing 1, 3- dichlorobenzene (1, 3-DCB) with methyl acetate, ethyl acetate, propyl acetate, butyl acetate and pentyl acetate at four different temperatures ( T = 303.15, 308.15, 313.15 and 318.15 K) and at atmospheric pressure. The experimental data of densities and speeds of sound has been further utilized to calculate excess molar volume ( V m E ) and excess isentropic compressibility ( κ S E ) the excess properties have been fitted to Redlich-Kister equation. Further, V m E results have also been discussed by using Prigogine–Flory–Patterson (PFP). The experimental speeds of sound data in the present investigated mixtures were compared with various theoretical models like collision factor theory (CFT) and free length theory (FLT) to check their relative merits of pure component properties. Moreover, the experimental excess functions were correlated in terms of FTIR spectral analysis.

关键词： Binary mixtures Densities Ester Halogenated benzene Speed of sound FTIR

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Investigation on Heat Transfer Characteristics of the H-type Finned Tube in Flue Gas with High Content of Ash

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Energy Procedia 2017年 105卷 4680-4684页

作者： Tao Han Chang’an Wang Qi Cao Wufeng Chen Defu Che State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an 710049 China

H-type finned tube is rarely used in waste heat recovery power generation stations, though it has an efficient heat transfer performance in large thermal power stations (WHRPGs, hereafter). To date, understanding of heat performance of H-type finned tube in WHRPGs is still lacked. The heat transfer characteristics of H-type finned tube in gas with high content of ash in WHRPGs was investigated in practical cement plant in present work. The actual ash deposition pattern was observed meanwhile. The characteristics of heat transfer process including heat transfer coefficient, heat effective coefficient, and flue resistance at gas velocity between 4.5 - 6.5 m·s –1 are obtained. Experimental results show that the heat transfer coefficient increases with gas velocity linearly, the heat effective coefficient nearly keep stable on the other hand, and serious ash-block problem occurs in flow area in the heat exchanger at the gas velocity of 4.5 - 6.5 m·s –1 . The max heat transfer coefficient remain below 10 w·m –2 ·k –1 , implying heat performance of H-type finned tube in WHRPGs is possibly inefficient.

关键词： H-type finned tube heat performance heat transfer

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Laser-induced Morphology Change and Photo-thermolysis of Gold Nano Particles with Application in Laser Dermatology

Laser-induced Morphology Change and Photo-thermolysis of Gol...

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2017第六届国际新材料大会

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

Based on the principle of selective photothermolysis,laser photothermal therapy is regarded as the most effective treatment methodology for port-wine stain（PWS）,which is a congenital vascular malformation caused by the expansion of capillaries in the dermis.1064 nm Nd:YAG laser has great potential for the treatment of deeper and larger ***,the clinical effectiveness is limited because of the weak absorption of blood to Nd:YAG *** order to enhance the blood absorption,spherical gold nanoparticles were prepared by Sodium citrate reduction method with average size of 16.7 nm and absorbance peak at 522 *** nanorods were prepared by Seeded growth method and modified by PEG with average length and width of 79.1 nm and 13.5 *** this aspect ratio of 5.89,a strong absorption band at050 nm in the near-infrared range is *** can inject spherical gold particles into the bloodstream to enhance the light absorption of blood in visible range,while using gold nanorod to increase absorbance of blood to Nd:YAG Laser for improving the cure rate of laser treatment of vascular *** absorption was increased by 1.25 times for 581 nm（PDL laser） and 3.71 times for 1064 nm（Nd:YAG laser）.To investigate the morphology change and photothermolysis of gold NRs induced by Nd:YAG laser and obtain the optimal irradiation conditions for effectively destroying the vascular lesions,tissue-like phantoms were prepared and exposed to Nd:YAG laser with various laser parameters to investigate the photothermolysis of gold *** obtained the optimal photothermolysis of gold NRs for destroying the blood vessel as follows:When the concentration of gold NRs is 26.67 g/mL,the Nd:YAG laser energy density should be 40 J/cm2,with long laser pulse width of 0.3 ms for ten pulses.

关键词： Laser-induced Morphology Change and Photo-thermolysis of Gold Nano Particles with Application in Laser Dermatology

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Numerical Investigation on the Performance of Different Primary Nozzle Structures in the Supersonic Ejector

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Energy Procedia 2017年 105卷 4997-5004页

作者： Kangkang Xue Kaihua Li Weixiong Chen Daotong Chong Junjie Yan State Key Laboratory of Multiphase Flow in Power Engineering Xi’an JiaotongUniversity Xi’an Shaanxi 710049 P.R. China

Computational fluid dynamics (CFD) technique is employed to investigate the effect of primary nozzle structures on the supersonic ejector performance. The performance of the supersonic ejectors with three different nozzle structures, including conical nozzle, petalage nozzle and crenation nozzle, have been compared under the same conditions. Compared with the ejector equipped with the conical nozzle, the entrainment ratio of petalage nozzle is slightly smaller, while the critical back pressure increases by 5.2%. Just the opposite, the entrainment ratio of crenation nozzle is slightly higher, and the critical back pressure would decrease by 2.1%. In addition, the effects of primary/induced fluid pressure on the flow field (pressure and Mach number along the ejector centerline) are observed and analyzed to explain the mixing process occurring inside the ejector. It finds out that the shape of the mixing layer in the supersonic ejector with different nozzles is different.

关键词： Supersonic ejector CFD Primary nozzle Entrainment ratio Critical back pressure

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Ferrites boosting photocatalytic hydrogen evolution over graphitic carbon nitride: a case study of(Co, Ni)Fe_2O_4 modification

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Science Bulletin 2016年第4期61卷 292-301页

作者： Jie Chen Daming Zhao Zhidan Diao Miao Wang Shaohua Shen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University

The charge cartier separation and surface catalytic redox reactions are of primary importance as elementary steps in photocatalytic hydrogen evolution. In this study, both of these two processes in photocatalytic hydrogen evolution over graphitic carbon nitride （g-C3N4） were greatly promoted with the earth-abundant ferrites （Co, Ni）Fe2O4 modification. CoFe2O4 was further demonstrated to be a better modifier for g-C3N4 as compared to NiFe2O4, due to the more efficient charge carrier transfer as well as superior surface oxidative catalytic activity. When together loading CoFe2O4 and reductive hydrogen production electrocatalyst Pt onto g-C3N4, the obtained Pt/g-C3N4/CoFe2O4 photocatalyst achieved visible-light （2 〉 420 nm） hydrogen production rate 3.5 times as high as Pt/g-C3N4, with the apparent quantum yield reaching 3.35 % at 420 nm.

关键词： Graphitic carbon nitride FerritesPhotocatalytic water splitting Solar hydrogenconversion

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Three-dimensional analysis of condensation nanofluid film on an inclined rotating disk by efficient analytical methods

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Arab Journal of Basic and Applied Sciences 2018年第1期25卷 28-37页

作者： Hatami, M. Jing, D. Yousif, Majeed A. Department of Mechanical Engineering Esfarayen University of Technology Esfarayen Iran State Key Laboratory of Multiphase Flow in Power Engineering & International Research Center for Renewable Energy Xi’an Jiaotong University Xi’an China Department of Mathematics Faculty of Science University of Zakho Zakho Iraq

In this study, least square method (LSM) and differential transform method (DTM) applied to solve the three dimensional problem of steady nanofluid deposition on an inclined rotating disk is illustrated. The governing non-linear partial differential equations are reduced to the nonlinear ordinary differential equations system by similarity transform. There is a good agreement between the present analytical and numerical results. Results indicate that increasing nanofluid volume fraction leads to increase in temperature profile and highest temperature obtained for aluminium oxide (Al₂O₃)-water case. © 2018, © 2018 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group on behalf of the University of Bahrain.

关键词： condensation film DTM film thickness LSM Nanofluid rotating disk

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Spontaneous photoelectric field-enhancement effect prompts the low cost hierarchical growth of highly ordered heteronanostructures for solar water splitting

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Nano Research 2016年第6期9卷 1561-1569页

作者： Yankuan Wei Jinzhan Su XiaokangWan Liejin Guo Lionel Vayssieres International Research Center for Renewable Energy State Key Laboratory for Multiphase Flow in Power Engineering School of Energy &Power Engineering Xi'an Jiaotong University Xi'an 710049 China

In this study, a potentially universal new strategy is reported for the large-scale, low-cost fabrication of visible-light-active highly ordered heteronanostructures based on the spontaneous photoelectric-field-enhancement effect inherent in pyramidal morphology. The hierarchical vertically oriented arrayed structures comprise an active molecular co-catalyst at the apex of a visible-light-active large band gap semiconductor for low-cost solar water splitting in a neutral aqueous medium without the use of a sacrificial agent.

关键词： bismuth vanadate co-catalysts photocatalysis solar water splitting oxygen evolution

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