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International Conference on power engineering 2021, ICOPE 2021

作者： Xiaole, Chen Qulan, Zhou Du, Wen Qingtian, Liu Na, Li State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

Elbow wear, which is most likely occurring in pneumatic conveying, becomes a key factor in development of pneumatic conveying. This paper used 3D DEM-CFD to simulate the elbow wear in pneumatic conveying system. Simulation results show that: elbow wear is linear with material mass flow rate. Elbow wear increases along with the increasement of material particle velocity. When the velocity changes from 0 to 10m/s, the elbow wear increases 3.13 times. Elbow wear increases while the radius of material particles is growing. When the particles radius increases from 0.1mm to 0.5mm, the elbow wear increases 11.13%. This paper also established a complete pneumatic conveying device for experiment. In pneumatic conveying experiment, the pressure loss was measured in situations: different airflow velocity, different velocity of material particles. The results of experiment show the same regular indicated in simulation. © 2021 The Japan Society of Mechanical Engineers.

关键词： Wear of materials

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Thermal and film dynamics of multi-nozzle flash spray cooling towards large area and non-uniform heat source

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Thermal Science and engineering Progress 2025年 63卷

作者： Lin, Xiang-Wei Wang, Xu-Dong Zhou, Zhi-Fu Zhu, Dong-Qing Xu, Wen-Wei Zhu, Hai State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Huawei Technologies Co. Ltd. Shenzhen China

Thermal management poses a crucial challenge to the operational reliability of high-power devices which characterized by large area and uneven heat sources. Flash spray, as one of the start-of-the-art technologies, satisfies the requirements of rapid heat removal and superior droplet breakup effects. This study aims to investigate the liquid dynamics and heat transfer characteristics of multi-nozzle flash spray on a non-uniform heat flux surface. Here, the Euler-Lagrangian method is coupled to account for the gas-droplet interactions, and the Lagrangian wall-film is applied to describe the liquid film evolution. The effects of spray height and nozzle number are systematically discussed in terms of velocity, liquid film thickness, average surface temperature, and temperature non-uniformity. Results reveal that the enhanced spray-to-spray interaction can greatly alter liquid film distribution, which in turn affects the heat transfer efficiency. Notably, while increasing spray coverage improves thermal contact area, it exhibits a non-linear relationship with temperature reduction, showing an optimal spray height and nozzle number for minimizing average temperature and temperature non-uniformity. The main contribution of present work lies in its in-depth analysis of multi-nozzle flash spray on large area and uneven heating surface, which is prevalent in industrial applications buy underexplored in prior works. These findings are expected to offer actionable guidelines for understanding complex spray cooling mechanisms and designing efficient thermal management systems. © 2025 Elsevier Ltd

关键词： Film cooling

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Numerical Analysis of Thermal-Hydraulic Characteristics of the Whole Lfr Core Under Blockage Conditions

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SSRN 2024年

作者： Yu, Jiacheng Liu, Kai Qiu, Hanrui Wang, Mingjun Tian, Wenxi Su, Guanghui State Key Laboratory of Multiphase Flow in Power Engineering Department of Nuclear Science and Technology Xi’an Jiaotong University Xi’an China

Blockage accidents are critical scenarios in the design and safety analysis of lead-bismuth cooled fast reactor (LFR) core. Traditional analysis of blockage accidents in LFR focuses on localized, fine-scale computational fluid dynamics (CFD) simulations of single or three assemblies, but the analysis of the whole core scale impact caused by blockage accidents is insufficient. Therefore, this paper uses CorTAF-LBE, a three-dimensional thermal-hydraulic analysis code developed by XJTU-NuTHeL, to analyze the impact of blockage accidents on the whole core of the LFR. The reliability of the code in calculating thermal-hydraulic parameters under blockage accidents was validated based on the KALLA-THEADES and KALLA-IWF experiments. Taking the MYRRHA-FASTEF core as the object, simulations and analyses are conducted for various blockage scenarios with different lengths and positions. The results indicate that blockage accidents lead to an enlarged coolant temperature gradient at the core outlet. Lengthening the blockage results in an elevation of the peak temperature in the cladding. Under 2.06% blockage at the center of the assembly, blockage in the middle of the heating segment poses the greatest threat to cladding integrity, with the maximum temperature reaching 1336.9K, an increase of 635.4K compared to normal operating conditions. Under 4.59% blockage at the edge of the assembly, the maximum cladding temperature reaches 1381.8K, and the heat transfer rate of the inter-wrapper flow (IWF) adjacent to the blockage area is 24.2% higher than under normal operation. Additionally, severe degradation in heat transfer downstream was not observed in several simulated blockage scenarios. © 2024, The Authors. All rights reserved.

关键词： Fast reactors

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Experimental study on the influence of the temperature and thermal Stress of water wall in different arrangements of burners

Experimental study on the influence of the temperature and t...

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International Conference on power engineering 2021, ICOPE 2021

作者： Wei, Lin Zhou, Qulan Liu, Zhuhan Li, Na State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

To study the water walls' safety problems of the opposed firing boiler, thermal experiments for four typical arrangements of burners conditions are run in a laboratory-scale boiler. The four working conditions include 25% rated load (four burners are arranged side by side on the front wall), 50% rated load (eight burners are all arranged on the front wall;eight burners are arranged opposed to each other on the front and rear walls) and 100% load (front and rear walls are filled with sixteen burners). The principal strain, principal stress and temperature distribution of the water wall under four operating conditions are drawn for comparison and analysis. In addition, the results of the thermal stress, principal main stress direction and water wall temperature of the four working conditions are counted respectively to summarize the laws of them. This study highlights the influence of the temperature and thermal stress on water walls in different arrangements of burners to guide the safe operation of water walls in the real opposed firing boiler. © 2021 The Japan Society of Mechanical Engineers.

关键词： Thermal stress

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Prediction of von Mises stress on the membrane wall in a lab-scale arch-fired boiler based on artificial neural work

Prediction of von Mises stress on the membrane wall in a lab...

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International Conference on power engineering 2021, ICOPE 2021

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

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An Innovative Damping Random Walk Algorithm with Compulsive Evolution for the Synthesis of Heat Exchanger Networks

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SSRN 2024年

作者： Huang, Xiaohuang Liu, Weiwei Xu, Yue Xiao, Yuan Duan, Huanhuan Cui, Guomin 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 Shanghai200093 China

The development of heat exchanger networks is considered a hot research topic within the chemical processing sector. In this regard, the proper design of heat exchanger networks significantly improves energy efficiency, reduces costs, and decreases carbon footprints. However, the design of optimal heat exchanger networks is often a challenge, primarily because the problem is characterized by nonlinear, nonconvex, and discontinuous attributes. Moreover, it is coupled with the prevalence of numerous local optima in the solution space. At a certain level of the optimization problem, the process becomes trapped in local extremes. Thus, the process will not be able to advance further, leading to a stagnation in the optimization. This study introduces an innovative damping Random Walk Algorithm with Compulsive Evolution (damping RWCE). The proposed method is an extension of the stochastic RWCE algorithm, which has received a lot of attention recently. The presented damping RWCE algorithm incorporates a damping coefficient to temper the acceptance of optimal solutions. This slows the rate of structural changes without undue interference. The added value of this approach lies in its thorough examination of both discrete and continuous variables, which, in turn, decreases the probability of neglecting potential solutions. This method successfully navigates out of local optima, increasing the likelihood of identifying the global optimum. To implement and evaluate the proposed method, three types of damping coefficients are defined. The method effectiveness is then validated, considering three case scenarios. The results demonstrated that the optimal total annual costs obtained in this study are more favorable compared to the optimal results listed in the literatures. © 2024, The Authors. All rights reserved.

关键词： Damping

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In Situ Synthesis of Cu_(3)P/P-Doped g-C_(3)N_(4)Tight 2D/2D Heterojunction Boosting Photocatalytic H2 Evolution

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Chinese Journal of Chemistry 2023年第2期41卷 173-180页

作者： Fangyong Hou Feng Liu Haochen Wu Muhammad Qasim Yi Chen Yang Duan Zhibo Feng Maochang Liu International Research Center for Renewable Energy&State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'anShaanxi 710049China School of Electronic Engineering Jiujiang UniversityJiujiangJiangxi 332005China Gree Altairnano New Energy Inc ZhuhaiGuangdong 519040China Suzhou Academy of Xi'an Jiao tong University SuzhouJiangsu 215123China

Heterojunction design in a two-dimensional(2D)fashion has been deemed beneficial for improving the photocatalytic activity of g-C_(3)N_(4)because of the promoted interfacial charge transfer,yet still facing ***,we construct a novel 2D/2D Cu_(3)P nanosheet/P-doped g-C_(3)N_(4)(PCN)nanosheet heterojunction photocatalyst(PCN/Cu_(3)P)through a simple in-situ phosphorization treatment of 2D/2D CuS/g-C_(3)N_(4)composite for photocatalytic H2 *** demonstrate that the 2D lamellar structure of both CuS and g-C_(3)N_(4)could be well reserved in the phosphorization process,while CuS and g-C_(3)N_(4)in-situ transformed into Cu_(3)P and PCN,respectively,leading to the formation of PCN/Cu_(3)P tight 2D/2D *** to the large contact area provided by intimate face-to-face 2D/2D structure,the PCN/Cu_(3)P photocatalyst exhibits significantly enhanced charge separation efficiency,thus achieving a boosted visible-light-driven photocatalytic *** highest rate for H2 evolution reaches 5.12 umol·h^(-1),nearly 24 times and 368 times higher than that of pristine PCN and g-C_(3)N_(4),*** work represents an excellent example in elaborately con-structing g-C_(3)N_(4)-based 2D/2D heterostructure and could be extended to other photocatalyst/co-catalyst system.

关键词： Photocatalysis Water splitting 2D/2D heterojunction g-C_(3)N_(4) Energy conversion Charge transfer Nanosheet photocatalyst

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Experimental Study on Condensation Heat Transfer Characteristics inside an Inclined Wave-Finned Flat Tube of Direct Air-Cooling System

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Journal of Thermal Science 2021年第2期30卷 432-440页

作者： WANG Haitao TAO Tao MEI Xuesong WANG Haijun GU Hongfang State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong UniversityXi'an 710049China Shaanxi Key Laboratory of Intelligent Robots School of Mechanical EngineeringXi'an Jiaotong UniversityXi'an 710049China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

In this paper,the condensation heat transfer characteristics of parallel flow and counter flow inside an inclined wave-finned flat tube is investigated *** condensation heat transfer coefficients are analyzed based on the experimental *** of experiments show that condensation heat transfer coefficient decreases as the temperature difference Δt=ts-tw increases and mass flow rate *** parallel flow has a similar development with the counter flow,and the condensation heat transfer coefficient of counter flow is less than that of parallel flow under the same air cooling *** addition,condensation heat transfer coefficient correlations are also obtained under experimental *** calculations agree well with the measured data and the agreement is seen to be within ±4% for the parallel flow and ±5% for the counter flow.

关键词： condensation heat transfer wave-finned fiat tube modified model parallel flow counter flow

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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 engineering 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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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 engineering 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 15kw 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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