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2013 Spring International Conference on Material Sciences and Technology, MST-S 2013

作者： Li, Xing Xing Yi, Chun Hai Yang, Bo Lun Zhang, Yong Men, Chang Gui He, Gen Liang Xu, Hong Dong Department of Chemical Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China Northwest Research Institute of Chemical Industry Xi'an Shaanxi 710049 China

ISBN: (纸本)9783037857090

Considering the volumetric reactions and particle surface reactions in an entrained flow gasifier, the non-premixed combustion model based on the wet particles combustion method is adopted to simulate the multi-component slurry gasification process with FLUENT software. The velocity, temperature and concentration profiles of the gas products in the gasifier are obtained. Simulated results agree well with the commercial data, which verified the validity and applicability of the present model. Simultaneously, the reaction subarea in the gasifier has turned out to be obvious, the water evaporation, volatiles cracking and combustion reactions mainly appear in the jet region of the gasifier, the char gasification mainly appear in the freeboard region, but few reactions appear in the recirculation region. Moreover, with the increase of the mass fraction of the multi-component slurry, the content of the syngas at the gasifier outlet increases, while with the oxygen carbon atom ratio increasing, the syngas yield is rising early but declining later. © (2013) Trans Tech Publications, Switzerland.

关键词： Surface reactions

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Optical Analysis of Fresnel lens for concentrating PV system

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AIP Conference Proceedings 2010年第1期1207卷 244-251页

作者： F. Q. Cui Y. L. He R. J. Xu Y. B. Tao aState Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University China

Concentrating PV systems usually use Fresnel lens as radiation concentrator. In this paper, in order to study the concentrating performance of the Fresnel lens, modular Fresnel lens mode was developed and its optical performance was analyzed by the ray tracing method. The imaging characteristic of Fresnel was studied and the optimal imaging location and the size of dispersion spot with different inlet angle were figured out. Flux distribution of the different imaging plane were also examined and compared. The results show that the dispersion spot deviates from the focus and the size of the dispersion spot is enlarged as the incidence angle increase, especially at the high geometric concentration ratio. Then in order to solve the problem, a flat light pipe was applied to reflect sun light onto the absorber plane. The simulation results show that with the new design, sun lights with large inlet angle could also be casted on the absorber.

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Flame brush thickness of premixed turbulent flames: Hydrodynamic theory versus experiments 9

Flame brush thickness of premixed turbulent flames: Hydrodyn...

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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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PHEBUS FPT-1 simulation, using MELCOR: Blockage model analysis 16

PHEBUS FPT-1 simulation, using MELCOR: Blockage model analys...

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16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2015

作者： Wang, Jun Corradii, Michael L. Haskin, Troy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Unite State Eagle Height 915 College of Engineering University of Wisconsin-Madison MadisonWI53705 United States

ISBN: (纸本)9781510811843

Recently, MAAP and MELCOR research teams completed a set of accident simulations to reconstruct the Fukushima-Daiichi accident in order to better understand severe accident progression. One result from this work was that the predicted hydrogen generation in MELCOR is notably more than in MAAP. The fuel rod degradation process (i.e., debris formation and blockage models) may likely be responsible for this hydrogen generation difference and an opportunity exists to understand the key reasons for this difference. To examine this hypothesis, the PHEBUS FPT1 experiment is selected as a benchmark test, and MELCOR is used as the analysis tool. In the past, the core degradation process of PHEBUS tests was simulated with MELCOR for fission product release insights. In this work, our calculation results are compared to PHEBUS FPT1 data to verify our MELCOR calculation. Given this validation of a nominal MELCOR simulation of the FPT1 test, we start the second step to use the volume fractions of each component as a way to visualize the debris-blockage geometric arrangement for PHEBUS FPT1 as the fuel degradation event proceeds. These results could also provide a logical approach for improving the fuel degradation (i.e., debris formation and blockage models). Relevant research is still ongoing, and will be provided in the final paper. © Copyright (2015) by American Nuclear Society All rights reserved.

关键词： Debris

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Sensitive measurement of trace mercury using low pressure laser-induced plasma

Sensitive measurement of trace mercury using low pressure la...

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作者： Wang, Zhenzhen Deguchi, Yoshihiro Kuwahara, Masakazu Zhang, Xiaobo Yan, Junjie Liu, Jiping State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an 710049 China Graduate School of Advanced Technology and Science University of Tokushima Tokushima 770-8501 Japan

The emission of trace heavy metals, such as mercury (Hg), from power plants and other industries is a severe environmental problem concerning the public health. The laser-induced plasma technique was employed to measure Hg under various conditions, which reveals several merits of this method at low pressure. The main interferences of laser-induced breakdown spectroscopy (LIBS), which include the black-body-like emission from plasma itself and coexisting molecular and atomic emissions, decreased significantly using low pressure laser-induced plasma. Under low pressure conditions, Hg signal was rather clear without serious influence even if there is no delay time from the laser irradiation, which means the gated detection device is not necessary. This method featured the detection limit of 0.3 ppm at pressure 700 Pa. Additionally, the feasible of this method in real applications was demonstrated by measuring Hg in combustion gas which performed preferable results. © 2013 The Japan Society of Applied Physics.

关键词： Laser induced breakdown spectroscopy

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Thermal boundary condition for the thermal lattice Boltzmann equation

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Physical Review E 2005年第1期72卷 016703-016703页

作者： G. H. Tang W. Q. Tao Y. L. He State Key Laboratory of Multiphase Flow School of Energy and Power Engineering Xi’an Jiaotong University Xi’an Shaanxi 710049 China

A thermal boundary condition for a double-population thermal lattice Boltzmann equation (TLBE) is introduced and numerically demonstrated. The unknown distribution population at the boundary node is decomposed into its equilibrium part and nonequilibrium parts, and then the nonequilibrium part is approximated with a first-order extrapolation of the nonequilibrium part of the populations at the neighboring fluid nodes. Numerical tests with Dirichlet and Neumann boundary constraints show that the numerical results of the TLBE together with the present boundary schemes agree well with the analytical solutions and those of the finite-volume method.

关键词： NAVIER-STOKES EQUATION BGK MODEL HEAT-TRANSFER GAS AUTOMATA flowS SIMULATION PRESSURE VELOCITY

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High-temperature oxidation kinetics of iso-octane/nbutanol blends-air mixture 10

High-temperature oxidation kinetics of iso-octane/nbutanol b...

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10th Asia-Pacific Conference on Combustion, ASPACC 2015

作者： Li, Xiaotian Zhang, Xinyi Hu, Erjiang Huang, Zuohua State Key Laboratory of Multiphase Flows in Power Engineering Xi'an Jiaotong University Xi'an Shanxi Province710049 China

N-butanol/iso-octane blends chemical kinetic mechanism is established on the basis of a nbutanol reaction submodel and part of a high-temperature oxidation mechanism of iso-octane, laminar flame speeds of iso-octane/n-butanol blends are simulated and compared with the experimental data sets. It reveals that the Su increases nonlinearly with the increase of n-butanol in the blend and implies that the intermediates of n-butanol are more reactive. Then detailed kinetic path analysis of both nbutanol and iso-octane was performed to find out the rationale for the accelerating. The most influential intermediate reactions were determined for the blend, and flame propagation is largely negative related to concentration of ic4h8 c3h6 and CH3, while C2H4 and C2H3 contribute to the promotion of laminar flame speeds. Flame structures of n-butanol blending iso-octane were also computed and correspond to the kinetic path analysis.

关键词： Blending

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Sensitive detection of iodine by low pressure and short pulse laser-induced breakdown spectroscopy (LIBS)

Sensitive detection of iodine by low pressure and short puls...

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作者： Zhang, Xiaobo Deguchi, Yoshihiro Wang, Zhenzhen Yan, Junjie Liu, Jiping State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an 710049 China Graduate School of Advanced Technology and Science University of Tokushima Tokushima 770-8501 Japan

In this study, Laser-Induced Breakdown Spectroscopy (LIBS) technology was applied to detect iodine, an essential element for human body. Iodine in buffer gases of N2 and air was detected using nanosecond and picosecond breakdowns of CH3I at reduced pressure. Compared with the conventional methods of iodine measurement, LIBS technology without sample preparation shows the merits of fast response, real-time detection and enhanced detection limit. The measurement results of iodine demonstrated that low-pressure LIBS is the favourable method for trace species measurement in analytical applications. The plasma generation processes of multi-photon ionization and electron impact ionization can be controlled by pressure and laser pulse width for the larger ionization and excitation processes of iodine, which was discussed by the intensity ratio of iodine emission at 183 nm to nitrogen emission at 174.3 nm. The detection limit of iodine measurement in N2 was 60 ppb in nanosecond breakdown at 700 Pa. Iodine in air as the buffer gas was also detected using nanosecond and picosecond breakdowns to examine the effect of oxygen. This journal is © the Partner Organisations 2014.

关键词： Impact ionization

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Influence of wettability on motion of compound droplets on solid surface in microchannel flow

Influence of wettability on motion of compound droplets on s...

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2016年大连国际微流控和芯片实验室大会

作者： Xinglong Shang Bofeng Bai State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University

To understand droplet motion on solid surfaces is very important for many applications such as enhanced oil recovery（Freitas et al.2011）,droplet spreading,manipulation and fabrication of droplets in microfluidic devices（Worner et al.2012）.Solid surface wettability affects significantly the movement of the contact line and hence dominants the motion of droplets on solid surfaces,especially when the flow is confined to ***,the compound droplets are often common with the applications mentioned above（e.g.,water-in-oil-in-water and oil-in-water-in-oil type compound droplet）.Furthermore,the wettability of solid surfaces is often heterogeneous that make the drop motion more *** aim of this work is to investigate the influence of solid surface wettability（e.g.,solid surface wettability gradient and contact angle hysteresis） on the motion of compound droplets in microchannel *** this end,we develop a three-dimensional model by combining the front tracking method for drop surface motion and the generalized Navier boundary condition（Qian et al.2003） for contact line *** front tracking method to model the deformation and motion of compound droplets surrounded by elastic interfaces has been developed and validated in our previous work（Bai et al.2012;Luo et al.2015）.The presence of inner droplet significantly influences the deformation and motion of compound droplets on solid *** to the results from previous two-dimensional front tracking methods（Huang et al.2004） and other numerical methods（Ding et al.2010）,the pattern of ripples is observed in our simulations on the drop *** effects of dimensionless numbers including the Reynolds number,the capillary number and the volume ratio of the inner to the outer droplet are ***,it is demonstrated that the gradient of solid surface wettability and the hysteresis of contact angle have a remarkable effect on the deformation and motion of compound droplets.

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Study on the Radiation Distribution in A Fluidized Tubular Reactor for Heterogeneous Photocatalytic Hydrogen Production

Study on the Radiation Distribution in A Fluidized Tubular R...

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2011 International Conference on Energy and Environment(ICEE 2011)

作者： Zhao Liang Fan Liangliang Jing Dengwei Liu Wenxu Cao Fei Zhu Xule Yang Junyin Zhang Hailong State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Radiation distribution study is of importance for the design and the optimization of fluidized photocatalytic tubular reactor which has been developed for photocatalytic hydrogen production under direct solar light. In the present study, the radiation distribution in such reactor was successfully simulated by adopting Monte Carlo method and the six-flux radiation absorption-scattering models. Both the incident angles of light around the reactor and the concentration distribution of photocatalyst were taken into account. Our analysis indicates that the angles and the intensity of the incident rays significantly affect the radiation distribution. Moreover, it was also found that the equilibrium radiation distribution has a close relationship with the density distribution of the photocatalysts. The simulated results are expected to be helpful for obtaining the optimal operating parameters for solar photocatalytic hydrogen production.

关键词： radiation distribution,fluidized tubular reactor,nanometer catalyst,compound parabolic concentrators

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