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Comments on Three-point explicit compact difference scheme with arbitrary order of accuracy and its application in CFD

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Applied Mathematics and Mechanics(English Edition) 2009年第5期30卷 669-676页

作者：张红娜宇波王艺魏进家李凤臣 Beijing Key Laboratory of Urban Oil and Gas Distribution Technology China University of Petroleum School of Energy Science and Engineering Harbin Institute of Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

The explicit compact difference scheme, proposed in Three-point explicit compact difference scheme with arbitrary order of accuracy and its application in CFD by Lin et al., published in Applied Mathematics and Mechanics （English Edition）, 2007, 28（7）, 943-953, has the same performance as the conventional finite difference schemes. It is just another expression of the conventional finite difference schemes. The proposed expression does not have the advantages of a compact difference scheme. Nonetheless, we can more easily obtain and implement compared with the conventional expression in which the coefficients can only be obtained by solving equations, especially for higher accurate schemes.

关键词： explicit compact difference scheme conventional finite difference scheme central difference scheme upwind difference scheme

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Instantaneous liquid and gas leakage flow during plunger lifting process in vertical wells 11

Instantaneous liquid and gas leakage flow during plunger lif...

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1.th North American Conference on multiphase Technology

作者： Zhao, K. Bai, B. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

Plunger lift is an economical artificial lift method to solve the liquid loading problem in gas wells. Because of the inevitable annular gap between plunger and tube wall, the liquid above plunger may leak downward and the gas may slip upward during lifting process. How to quantitatively describe the gas-liquid counter-current flow sealing property is still challenging to optimize the plunger lift method. In this paper, the liquid leakage and gas slippage were observed experimentally. The transient physical models for gas and liquid leakage were proposed and verified. © 1.th North American Conference on {1. Technology. All rights reserved.

关键词： Liquids

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Edge detection based on wavelet analysis with Gaussian filter and application in multiphase {1.

Edge detection based on wavelet analysis with Gaussian filte...

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2008 ASME Summer Heat Transfer Conference, HT 2008

作者： Chen, Bin Yang, Fude Guo Ning, Yahui Tao State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

ISBN: (纸本)9780791848487

In this paper an edge detection algorithm based on wavelet transform with Gaussian filter was proposed. In this algorithm original images are firstly converted into gray images and then each pixel was analyzed using wavelet transform to find the local maximum of the gray gradient of each pixel along the phase angle direction and compared with a given threshold value, through which real edge can be kept and fake ones will be eliminated. In the computation of local maximum, the gray gradients computed in eight directions, which can improve precision of edge detection. After the investigation of influence of filter length, scale and threshold value on the edge detection and validation by comparison with N.L. Fenandez-Garcia's Minimean and Minimax methods for 1.0 real color images, we applied this algorithm to bubbly gas-liquid two-phase flow. Compared with Canny operator, present result is more close to real bubble shape and can distinguish very close bubbles, which indicates the algorithm is effective and can be used to study the interaction between different phases and flow field in multiphase flow. Copyright © 2008 by ASME.

关键词： Edge detection

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Experimental Study on Deliquification with Atomizing Nozzle in Gas Well

Experimental Study on Deliquification with Atomizing Nozzle ...

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2020 International Conference on Green Energy, Environment and Sustainable Development, GEESD 2020

作者： Gao, Yutang Li, Xiaobai Chang, Peng Liu, Lei State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Shaanxi710049 China

Gas is a clean energy resource in comparison with oil and coal. Liquid-loading problem is frequently encountered in the process of gas production. It would directly cause the production of gas wells decreasing, even off production. A number of deliquification techniques have been suggested for solving this kind of problem, but the available techniques are not yet widely applicable. Based on the analysis, the method of deliquification with atomizing nozzle in gas wells was put forward. The test bench was designed for studying the atomization of nozzles and the liquid entrainment of gas flow. The size distribution of atomized droplets was measured by Malvern laser grain size analyzer. The Sauter mean diameters of atomized droplets were analysed under different two-phase flow conditions. The results indicate that the designed nozzles have good atomization performances and show potential application for reducing liquid loading in gas wells. © Published under licence by IOP Publishing Ltd.

关键词： Two phase flow

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Experimental Study on Preparation of Amorphous SiO2 by Fluidized Bed Combstion of Rice Husk

Experimental Study on Preparation of Amorphous SiO2 by Fluid...

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International Conference on power {1. 2021. ICOPE 2021

作者： Tan, Jingkao Zhou, Qulan Yao, Yashu Li, Na State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

Rice husk ash contains SiO2 with a mass fraction of 87%-97%. Through controlled combustion under suitable conditions, SiO2 in rice husk ash will be amorphous, with high activity and rich porosity, which can be applied to construction, silicon preparation and adsorption *** it is necessary to study the effects of combustion parameters on the quality of RHA. Compared to conventional boiler furnace, the fluidized bed combustor has a lower combustion temperature and a longer residence time, which is suitable for the production of high quality amorphous rice husk ash. In this thesis, the effects of fluidized bed combustion parameters on the quality of RHA will be studied to provide guidance for amorphous SiO2 preparation by combustion control in boiler. On the existing 1.kw bench-scale fluidized bed system, experiments were made to study the effects of fluidized bed combustion parameters on the quality of RHA. The rice husk combustion curve was comprehensively depicted, and the rice husk ash was analyzed by BET analysis, XRD scanning and thermogravimetric analysis. Therefore, the casual relationship between rice husk combustion process and RHA quality was evaluated comprehensively. © 2021.The Japan Society of Mechanical Engineers.

关键词： Quality control

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Experimental study on the CO-SCR performance of honeycomb-based Fe-Cu/RHA catalyst

Experimental study on the CO-SCR performance of honeycomb-ba...

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International Conference on power {1. 2021. ICOPE 2021

作者： Pan, Yuqing Li, Na Wen, Du Ran, Shiyuan Wu, Chenyang Zhou, Qulan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

The combustion process of carbon-based fuels will produce CO. If CO can be used as a reducing agent to remove NO, the goal of removing NO and unburned carbon (UBC) simultaneously can be achieved. When rice husk ash (RHA) rich in amorphous SiO2 is used to support Fe-Cu metal oxides, its huge specific surface area and non-lattice microstructure can reduce the reaction temperature, so that Fe-Cu/RHA catalyst has a high performance of selective catalytic reduction of NO by CO (CO-SCR). The paper used honeycomb ceramic to support Fe-Cu/RHA catalyst, and studied the effects of preparation method, active ingredient loading and reaction conditions on the CO-SCR performance of integral catalyst. The experimental results showed that the integral catalyst obtained by the heating and stirring method was better than the room temperature method. The conversion rates of CO and NO of the integral catalyst increased with the increase of the active ingredient loading. Besides, the oxygen concentration had little effect on the conversion rates of NO and CO. The conversion rate of CO to CO2 increased with the increase of temperature, and it could reach up to 98%. The conversion rate of NO to N2 fluctuated slightly as the temperature increased. © 2021.The Japan Society of Mechanical Engineers.

关键词： Selective catalytic reduction

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An active learning workflow for predicting hydrogen atom adsorption energies on binary oxides based on local electronic transfer features

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Green Energy & Environment 2024年第10期9卷 1489-1496页

作者： Wenhao Jing Zihao Jiao Mengmeng Song Ya Liu Liejin Guo International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityShaanxi710049Xi'anChina Department of Energy and Power Engineering Shandong University of TechnologyZibo255000ShandongChina

Machine learning combined with density functional theory(DFT)enables rapid exploration of catalyst descriptors space such as adsorption energy,facilitating rapid and effective catalyst ***,there is still a lack of models for predicting adsorption energies on oxides,due to the complexity of elemental species and the ambiguous coordination *** work proposes an active learning workflow(LeNN)founded on local electronic transfer features(e)and the principle of coordinate rotation *** accurately characterizing the electron transfer to adsorption site atoms and their surrounding geometric structures,LeNN mitigates abrupt feature changes due to different element types and clarifies coordination *** a result,it enables the prediction of^(*)H adsorption energy on binary oxide surfaces with a mean absolute error(MAE)below 0.1. ***,we incorporate local coverage(θ_(l))and leverage neutral network ensemble to establish an active learning workflow,attaining a prediction MAE below 0.2 eV for 541. multi-^(*)H adsorption *** findings validate the universality and capability of the proposed features in predicting^(*)H adsorption energy on binary oxide surfaces.

关键词： Machine learning Adsorption energy Binary oxide Electron transfer Active learning

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Study on the Optical Properties, Crystal Growth and Photocatalytic Activity of Ni-doped TiO2 Nanoparticles 18

Study on the Optical Properties, Crystal Growth and Photocat...

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1.th World Hydrogen Energy Conference, WHEC 201.

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

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Influence of transient thermal response of solid wall on bubble dynamics in pool boiling

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Journal of Computational multiphase {1.s 2014年第3期6卷 313-327页

作者： Zhang, Liang Li, Zhen-Dong Li, Kai Li, Hui-Xiong Zhao, Jian-Fu Beijing100190 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi710049 China Beijing102209 China

Numerical simulation of single bubble pool boiling process including transient thermal response of solid wall is performed using the ghost fluid method and the level set method for the sharp interface representation. The results show that non-physical initial condition in the numerical simulation deeply affects the process of bubble growth, and then multi-cycle simulation is necessary to eliminate its influence. It is shown by the present results that two nucleate criteria, i.e. constant waiting time and constant nucleate superheat, for determining the appearance time for the subsequent bubble lead to the same quasi-steady process of bubble growth if they are matched with each other. A periodically expanding and receding thermal "hollow" can be observed inside solid wall underneath the growing bubble. The recovery of the temperature on the nucleate site and the thermal boundary layer near the heating surface is influenced by transient heat conduction inside solid wall, which can affect evidently bubble thermal dynamics and heat transfer.

关键词： Numerical methods

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Porous fixed-bed photoreactor for boosting C-C coupling in photocatalytic CO_(2)reduction

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eScience 2022年第4期2卷 428-437页

作者： Shengjie Bai Haoran Qiu Mengmeng Song Guiwei He Feng Wang Liejin Guo International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityXi'anShaanxi710049China

Solar-driven CO_(2)conversion to chemical fuels in an aqueous solution is restricted not only by photocatalysts but also by mass ***,a regulatable three-phase interface on a porous fixed-bed is constructed for efficient C-C coupling in photocatalytic CO_(2)*** photocatalytic results show that∼90%selectivity towards C^(2+)products is obtained by a Cu/Cd_(0.5)Zn_(0.5)S photocatalyst,with a yield of 6.54μmol/h(an irradiation area of 0.785 cm^(2)),while only 0.94μmol/h(an irradiation area of 1..625 cm^(2))is achieved with a commonly used suspension photocatalytic *** find that under the same CO_(2)feed rate,the local CO_(2)concentration in this porous fixed-bed photoreactor is obviously higher than in the suspension *** larger local CO_(2)coverage derived from a higher CO_(2)supply and aggregation enhances the C-C coupling,thereby generating more C^(2+).Even an observable three-phase interface on the porous fixed-bed can be regulated by adjusting the CO_(2)supply,for which the optimal gas inlet rate is 5-1. sccm.

关键词： Photocatalytic CO_(2)reduction Cu/Cd_(0.5)Zn_(0.5)S Porous fixed-bed Three-phase interface C^(2+)chemical fuel

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