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作者： Zhang, Yonghai Wei, Jinjia Guo, Dong State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China YanTai WanHua Group YanTai 264000 China

For highly efficient solving of the power dissipation problem of electronic components with high heat flux, experimental study of the flow-jet combined boiling heat transfer on silicon chips was conducted. Micro-pin-fins with dimensions of 30×60 μm2 and 30×120 μm2 (thickness × height) were fabricated on the chip surfaces by the dry etching technique. The experiments were made at three different cross-flow velocities Vc (0.5, 1.0, 1.5 m/s) and different jet velocities V j (0-2 m/s) with two liquid subcooling ΔTsub (25°C and 35°C). A smooth surface was also tested for comparison. The micro-pin-fins showed a considerable heat transfer enhancement due to an increase in effective heat transfer surface area caused by micro-convection around micro-pin-fins. The maximum allowable heat flux qmaxis increased and the wall superheat is decreased greatly. For a given Vc, the heat transfer enhancement is more significant as Vj increases, but the qmax increment decreases as Vc increases. The fin efficiency decreases as Vcor/and Vj increases or the heat flux q increases. The maximum q max can reach 161 W/cm2 at Vc == 1.5 m/s, Vj = 2 m/s, ΔTsub = 35°C for chip PF30-120. © 2012 by Begell House, Inc.

关键词： Heat flux

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Study on ignition delay times of dimethyl ether/propane/O2/Ar mixtures at elevated pressures

Study on ignition delay times of dimethyl ether/propane/O2/A...

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9th Asia-Pacific Conference on Combustion, ASPACC 2013

作者： Hu, Erjiang Pan, Lun Zhang, Zihang Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No.28 Xianning West Road Xi'an Shaanxi 710049 China

Ignition delay times of dimethyl ether (DME) and propane blends were measured in a shock tube at varied DME blending ratios (0%, 20%, 50%, 80%, 100%), equivalence ratios (0.5, 1.0, 2.0), temperatures (1100-1500 K) and pressures of 20 atm. Mechanism validations were conducted using different chemical kinetic models. A new C5 chemical model with DME sub-model was developed and it can well predict experimental ignition delay times of pure propane, DME and their blends. Experimental and numerical results show that with the decrease of temperature, the ignition delay times increase and the activation energy decreases slightly. With the increase of equivalence ratio, ignition delay times increase for propane and decrease for DME in this study. Ignition delay times decrease with the increase of DME blending ratio and the decrease rates become larger with the increase of equivalence ratio. The peak values of H and OH mole fraction increase with increasing the DME blending ratio, and they promote the ignition of DME/propane blends. Sensitivity analysis shows that the reaction rates of R1 and R353 increase with the increase of DME blending ratio and induces the decrease of the ignition delay time of DME/propane blends.

关键词： Ethers

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1‐Dodecane‐sulfonic‐acid‐sodium‐salt(LAS) assisted hydrothermal synthesis of CdxZn1−xS solid solution as efficient photocatalysts under visible light irradiation

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AIP Conference Proceedings 2010年第1期1207卷 1048-1052页

作者： B. Jia L. J. Guo aState Key Laboratory of Multiphase Flow in power Engineering Xi’an Jiaotong University China bState Key Laboratory of Multiphase Flow in power Engineering Xi’an Jiaotong University China

With anionic surfactant LAS assisted, series of zinc cadmium sulfide semiconductor photocatalysts were synthesized by hydrothermal method. These products were characterized by X‐ray diffraction (XRD), UV‐Vis absorption spectra (UV‐Vis) and scanning electron microscopy (FESEM). The photocatalytic activities of as‐prepared samples were evaluated by photocatalytic hydrogen production from water under visible‐light irradiation. The best synthesis parameters are: Composition 0.9:0.1 (Cd:Zn molar ratio), Temperature 160 °C, Hydrothermal Time 48 Hour, LAS Concentration 1.7 mmol/L, the maximum visible‐light‐catalytic hydrogen production rate is 161.25 μmol/h (λ>430 nm) which is higher than those of by coprecipitation method. The experiment results indicate that surfactant assisted hydrothermal method is an effective way to get highly active CdZnS solid solution photocatalyst.

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Homojunction photocatalysts for water splitting

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Nano Research 2022年第12期15卷 10171-10184页

作者： Xiangjiu Guan Shichao Zong Shaohua Shen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an710049China Suzhou Academy of Xi’an Jiaotong University Suzhou215123China Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region Ministry of EducationSchool of Water and EnvironmentChang’an UniversityXi’an710064China

Charge-carrier separation is regarded as one of the critical issues of photocatalytic water splitting and could be accelerated by constructing microscopic junctions in *** photocatalysts consisting of different forms of semiconductor with identical compositions could inherit the advantages of heterojunction-based photocatalysts in charge separation due to the built-in electric field,while omitting the potential drawbacks of interfacial lattice distortion by providing continuous band ***,homojunction-based photocatalysts have recently drawn growing attention in water *** this review,the synthetic approaches to preparing photocatalysts with various homojunction structures including p-n junction,phase junction,and facet junction were introduced,together with a comprehensive analysis and discussion on the latest progress in the application of photocatalytic water *** review work is expected to inspire more related work with promoted research on designing efficient homojunction-based photocatalytic systems for water splitting.

关键词： photocatalytic water splitting homojunction charge separation

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Simulation Study on Heat Exchangers Characteristics of Solar Thermal Steam System Based on Aspen Plus 2

Simulation Study on Heat Exchangers Characteristics of Solar...

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2nd International Conference on Algorithms, High Performance Computing and Artificial Intelligence, AHPCAI 2022

作者： Chen, Pengfei Chen, Kang Peng, Huaiwu Zhang, Yanlong Bawaa, Baercheng Zhao, Qiuyang Institute of Solar Engineering Technology Northwest Engineering Corporation Limited Power China Xi'an710065 China Xi'An Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an China

ISBN: (纸本)9798350334784

In the thermal recovery project of thick oil, there are high standards for steam temperature and flow rate. The solar thermal steam supply system can convert unstable solar energy into stable and efficient carrier heat, which can be used to transfer heat to low-temperature water to produce high-temperature steam and achieve a clean and low-carbon steam supply. The rated pressure of steam and the split ratio of molten salt in the heating system have a great influence on the demand area and heat load of solar panels. In this paper, a simulation is made on the solar thermal steam supply system based on Aspen Plus. The simulation result shows that the increase in pressure will cause a growth in the area of the photothermal concentrator field but will reduce the area used for photovoltaic panels. At the same time, it reduces the heat load of the evaporator and extends its service life. The split ratio affects the molten salt temperature at the outlet of the superheater and the reheater. When the split ratio increases, the heat transfer temperature difference between the two ends of the superheater heat flow decreases, and the heat transfer temperature difference of the reheater grows bigger. Therefore, the molten salt temperature flowing out of the reheater rises. © 2022 IEEE.

关键词： Heat exchangers

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Experiment of flow boiling heat transfer on micro-pin-finned chips with jet impingement

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Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 2011年第1期45卷 31-37页

作者： Guo, Dong Wei, Jinjia Zhang, Yonghai State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

The experiment of flow boiling heat transfer on micro-pin-finned chips in FC-72 with jet impingement was *** experimental conditions consisted of two different liquid subcooling degrees (25,35°C),three different cross flow velocities (Vc=0.5,1,1.5 m/s) and three different jet velocities (Vj=0,1,2 m/s).The dimensions of the silicon chips were 10 mm×10 mm×0.5 mm (length×width×thickness) on which two kinds of micro-pin-fins with the dimensions of 30 μm×120 μm,50 μm×120 μm (thickness×height) were fabricated by the dry etching technique. A smooth surface was also tested for comparison. The correlations for nucleate boiling curves and the maximum allowable heat flux curves were obtained. The results show that the heat transfer performance was improved with increasing liquid subcooling and flow velocity. All micro-pin-finned surfaces displayed a considerable heat transfer enhancement. The addition of jet impingement further enhanced the heat transfer at a high heat flux and increased the CHF. At a certain cross flow velocity, the enhancement was more significant as the jet velocity increased, especially for Vc=0.5 m/s, Vj=2 m/s. For the micro-pin-finned chips, the CHF increased by more than 93% while the subcooling was 35°C compared with Vc=0.5 m/s, Vj=0 m/s. As the cross velocity increased, the intensification degree of jet impingement decreased and the increase of CHF also decreased.

关键词： flow velocity

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Experimental Research on flow Pulse Characteristics of Pressurized-Liquid-Screen Bed

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2017年第10期38卷 2183-2189页

作者： Hu, Zheng-Tao Li, Lian Li, Na Zhou, Qu-Lan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

The experimental monitoring system of pressurized-liquid-screen bed was designed and set in this paper. The flow characteristics were studied especially the analysis of differential pressure pulse characteristics and friction factors variation by the way of adjusting gas flow, liquid flow and operation pressure parameters. According to the analysis of comparing experiment data and theory, the variation principle of pressure pulse intensity and friction factors under different gas flow, liquid flow and operation pressure was revealed as well as the optimal operation parameter was analyzed through combining the principle of fume desulfurization gas-liquid interactive reaction. This paper provides the crucial design references to the industrial application of pressurized-liquid-screen gas-liquid reaction system. © 2017, Science Press. All right reserved.

关键词： flow of gases

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氧化铁光阳极界面内建电场调控强化光生电荷空间分离

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Science China Materials 2023年第2期66卷 603-613页

作者：卯连连邓豪李明涛沈少华 International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049China

为了缓解氧化铁光阳极内部和表面的电荷复合,本文引入了一种界面电荷调控策略,利用界面内建电场(IEF)促进电荷的空间分离.水热生长的钛掺杂氧化铁(Hem)纳米棒通过简单的两步浸渍涂层过程,以石墨相氮化碳(g-C_(3)N_(4))和小的三氧化钼(Mo... 详细信息

为了缓解氧化铁光阳极内部和表面的电荷复合,本文引入了一种界面电荷调控策略,利用界面内建电场(IEF)促进电荷的空间分离.水热生长的钛掺杂氧化铁(Hem)纳米棒通过简单的两步浸渍涂层过程,以石墨相氮化碳(g-C_(3)N_(4))和小的三氧化钼(MoO_(3))团簇进行修饰.与原始的Hem相比,得到的Hem/C_(3)N_(4)/MoO_(3)表现出显著增强的光电化学分解水性能,相对于可逆氢电极,在1.23 V时,光阳极电流密度从0.3 mA cm^(-2)显著提高到1.6 mA cm^(-2),入射光子-电流转换效率在300 nm时达到18.4%.结果表明,在Hem/C_(3)N_(4)/MoO_(3)异质结中引入IEF是通过调控界面电荷特性实现的,此界面电荷特性是由Hem/C_(3)N_(4)界面的TypeⅡ能带排列和光阳极表面增强的能带弯曲所引起的,IEF能显著促进电荷的空间分离.研究这一界面电荷调控过程能为基于氧化铁的光阳极和其他半导体器件提供一种简单有效的策略,通过缓解载流子传输动力学的瓶颈,促进电荷的空间分离,实现高效的太阳能转换.

关键词：太阳能转换阳极电流密度半导体器件能带弯曲入射光子石墨相氮化碳载流子传输氢电极

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Heat and power Load Prediction for Combined Heat and power Station with Different Methods 4

Heat and Power Load Prediction for Combined Heat and Power S...

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4th IEEE International Conference on Digital Twins and Parallel Intelligence, DTPI 2024

作者： Wang, Lin Yu, Tingting Chen, Chen Gao, Yaokui Gao, Lin Qiu, Binbin Liu, Ming Xi'an Thermal Power Research Institute Co. Ltd Xi'an China Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an China

ISBN: (纸本)9798350349252

The accurate short-term load prediction is an essential prerequisite for ensuring the reliable and economic operation of combined heat and power stations. In this study, the heat load and power load prediction models of combined heat and power station were developed with long short-term memory (LSTM) and multiple linear regression (MLR), respectively. The preprocessing and correlation analysis of heat and power loads were conducted. The prediction effects of different prediction models were also compared and analyzed. Taking the data of February as an example, the mean absolute percentage error (MAPE) of heat load prediction with LSTM and MLR models are 3.20% and 3.75%, respectively, and the MAPE of power load prediction are 5.59% and 8.76%, respectively. The prediction results show that the performance of the LSTM model is better than that of the MLR model, and the prediction accuracy of the heat load is higher than that of the power load. © 2024 IEEE.

关键词： Prediction models

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Experimental Study on the Boiling Heat Transfer Characteristics of R134a in a Helically Coiled Tube

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2019年第3期40卷 587-593页

作者： Niu, Xiao-Juan Yuan, Huai-Jie Quan, Chen Bai, Bo-Feng Zhao, Liang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

The characteristics of R134a boiling heat transfer in a vertically helically coiled tube are studied. The experimental parameters are as follows: the heat flux is 10∼60 kW•m-2, the mass flux is 195∼400 kg•m-2 •s-1, the pressure is 0.8∼1.1 MPa, and the outlet vapor quality is 0.1∼0.9. The experimental data are compared with the existing correlations of boiling heat transfer coefficient. Based on the analysis of boiling heat transfer mechanism, a new correlation for boiling heat transfer in coiled tube is proposed. The circumferential distribution characteristics of wall temperature and heat transfer coefficient are analyzed. The wall temperatures at inner and top side are relatively higher, and the heat transfer coefficients at the bottom and the outer side are relatively higher. The local heat transfer coefficients are compared with the new correlation proposed in this paper. The results show that the heat transfer coefficients at top and bottom sides can be predicted by the new correlation. However, the new correlation underestimates the heat transfer coefficient at the outer side and overestimates that at the inner side, the deviations are 16.6% and -11.9% respectively. © 2019, Science Press. All right reserved.

关键词： Heat transfer coefficients

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