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Deformation Analysis and Prediction of Pneumatic Probe Based on Fluid-structure Interaction

International Journal of Fluid Machinery and Systems 2023年第1期16卷 1-13页

作者： Fan, Yang Dexin, Qiu Xinwei, Zhao Qingyi, Sai Xiaoshu, Cai School of Energy and Power Engineering University of Shanghai for Science and Technology No. 516 Jungong Road Shanghai200093 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Sh anghai for Science and Technology No. 516 Jungong Road Shanghai200093 China

As an essential tool for measuring flow field, pneumatic probes have gained a wide range of applications. In order to obtain the flow field parameters accurately, it is also crucial to study the deformation of the pneumatic probe structure in flow field. In this paper, the deformation of the conical probe is numerically simulated under the condition of steady incoming flow in the transonic flow field. The fluid-structure interaction and modal analysis methods are used to obtain the deformation and vibration frequency of the probe. The results show that the vibration of the probe is underdamped under the action of two-way fluid-structure interaction, and the total deformation decays exponentially, and the total deformation after stabilization is the same as the result of one-way fluid-structure interaction. For the same material probe, the total deformation changes with time in the same dimensionless expression, and the vibration frequency as well as damping factor do not change due to the variation of flow field. The accuracy of the dimensionless expressions was verified by different incoming flow conditions and the probe material. For the cases studied in this paper, the maximum total deformation, vibration frequency and damping factor of the probe in the flow field can be obtained by using one-way fluid-structure interaction, modal analysis and two-way fluid-structure interaction with a small number of cycles, respectively, so that the total deformation of the probe in the flow field can be predicted over time. The method obtained in this paper can significantly reduce the calculation time for obtaining the probe deformation data in the flow field and improve the work efficiency, which can provide a reference for the design, calibration and application of probes in engineering applications. © 2023, Turbomachinery Society of Japan. All rights reserved.

关键词： Modal analysis

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Experimental Study on flow Boiling and Circumferential Non-Uniform Heat Transfer Characteristics in Helically-Coiled Tube Under Coupled Heat Transfer Conditions

SSRN

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SSRN 2024年

作者： Wang, Hengyuan Xuan, Qiyu Lei, Hailin Li, Xi Li, Zhibin Li, Huixiong State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an710049 China

Because of its compact structure and high energy conversion efficiency, helically-coiled tube steam generator has been widely used in nuclear reactor, energy power, petrochemical and other systems. In the liquid metal reactor, the liquid metal on the primary side of the helically-coiled tube steam generator washes the helically-coiled tube bundles, and exchanges heat with the water on the secondary side. Due to the coupled heat transfer between liquid metal and water, the distribution of the wall temperature or heat transfer coefficient of helically-coiled tube are significant different in the circumference direction of the tube cross-section. An experimental system of helically-coiled tube steam generator was set up in this paper. The non-uniform heat transfer characteristics of secondary side fluid of helically-coiled tube steam generator were studied under the coupled heat transfer conditions between the heat transfer of primary side and secondary sides fluid. It was found the local wall temperature or local heat transfer coefficient in the circumferential direction of the tube cross-section was significantly different, and they showed different change trends with the change of the parameters such as subcooling degree, mass flux of the secondary side fluid, system pressure of secondary side fluid, heating temperature of primary side fluid, etc. Secondly, ηt and ηh were defined to represent the degree of local non-uniformity of local wall temperature or local heat transfer coefficient in the circumferential distribution of the tube cross-section, respectively. δt and δh were defined to characterize the degree of overall non-uniformity of wall temperature or heat transfer coefficient in the circumferential distribution of the tube cross-section, respectively. The variation rules of ηt and ηh, δt and δh with subcooling degree、system pressure、mass flux of primary side fluid、mass flux of secondary side fluid and heating temperature of primary side fluid were obtained.

关键词： Steam generators

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ReaxFF-MD simulation investigation of the degradation pathway of phenol for hydrogen production by supercritical water gasification

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Energy Storage and Saving 2023年第4期2卷 578-585页

作者： Deming Zhang Shaoqi Wang Yu Feng Zixuan Wang Hui Jin School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhenGuangdong518055China Institute of Intelligent Ocean Engineering Harbin Institute of TechnologyShenzhenGuangdong518055China State Key Laboratory of Multiphase Flow in Power Engineering(SKLMF) Xi’an Jiaotong UniversityXi’an710049China

Wastewater from the thermochemical conversion of coal and biomass contains a significant amount of phenolic structures *** degradation of these phenolic compounds to hydrogen-rich gasses can prevent envi-ronmental pollution and save *** water(SCW)gasification of phenol is experimentally studied and a reactive force field molecular dynamics(ReaxFF-MD)simulation is conducted to investigate the catalytic mechanism of Ni/Al2 O3 in the phenol *** experimental results indicate that Ni/Al2 O3 facilitates the conversion of phenol to 1-ethoxy butane via ring opening,which is a crucial step for complete *** ReaxFF-MD simulation demonstrated that Ni facilitates the formation of H3 O free radicals and Ni-phenol inter-mediates.H3 O free radicals can be decomposed into H2 and OH free *** the generated OH free radical and Ni-phenol intermediate promote the ring-opening reaction of *** promotes the direct decomposition of phenol into C1,C2,and C3 fragments,which is beneficial for further complete gasification.

关键词： Supercritical water gasification Phenol degradation Ring opening process ReaxFF-MD

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A n-Si/CoOx/Ni:CoOOH photoanode producing 600 mV photovoltage for efficient photoelectrochemical water splitting

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Science China Materials 2022年第12期65卷 3442-3451页

作者： Zhuocheng Yin Yuchuan Shi Shaohua Shen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049China

n-Si,believed as a promising photoanode candidate,has suffered from sluggish oxygen evolution reaction(OER)kinetics and poor chemical stability when exposed to aqueous ***,CoO_(x)/Ni:CoOOH bilayers were successfully deposited on n-Si substrate by atomic layer-deposition(ALD)and photoassisted electrochemical deposition(PED)for stabilizing and catalyzing photoelectrochemical(PEC)water *** comparison to the n-Si/CoO_(x)photoanode as reference,the prepared n-Si/CoO_(x)/Ni:CoOOH photoanode upon the optimized PED process presents a much improved PEC performance for water splitting,with the onset potential cathodically shifted to~1.03 V *** hydrogen electrode(RHE)and the photocurrent density much increased to 20 mA cm^(−2)at 1.23 V *** is revealed that the introduction of Ni dopants increases the work functions of the deposited Ni:CoOOH overlayers,which gives rise to the upward band bending weakened at the n-Si/CoO_(x)/Ni:CoOOH cascading interface while strengthened at the Ni:CoOOH/electrolyte interface(with the band bending shifted from downward to upward),contributing to the decreased and the increased driving forces for charge transfer at the interfaces,***,the balanced driving forces at the interfaces would endow the n-Si/CoO_(x)/Ni:CoOOH photoanode with the best PEC ***,PED has been evidenced superior to ED to dope Ni into CoOOH with the formed overlayer effectively catalyzing and stabilizing PEC water splitting.

关键词： n-Si photoanode work function photoelectrochemical water splitting

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Comparative analysis on gas–solid drag models in MFIX-DEM simulations of bubbling fluidized bed

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Chinese Journal of Chemical engineering 2023年第12期64卷 64-75页

作者： Ruiyu Li Xiaole Huang Yuhao Wu Lingxiao Dong Srdjan Beloševic Aleksandar Milicevic Ivan Tomanovic Lei Deng Defu Che State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an 710049China Shunde Institute of Inspection Guangdong Institute of Special Equipment Inspection and ResearchFoshan 528300China Department of Thermal Engineering and Energy "VINCA" Institute of Nuclear Sciences–National Institute of the Republic of SerbiaUniversity of BelgradeMike Petrovica Alasa 12-1411351 VincaPO Box 52211001 BelgradeSerbia

In this study,the open-source software MFIX-DEM simulations of a bubbling fluidized bed(BFB)are applied to assess nine drag models according to experimental and direct numerical simulation(DNS)*** influence of superficial gas velocity on gas–solid flow is also *** results show that according to the distribution of time-averaged particle axial velocity in y direction,except for Wen–Yu and Tenneti–Garg–Subramaniam(TGS),other drag models are consistent with the experimental and DNS *** the TGS drag model,the layer-by-layer movement of particles is observed,which indicates the particle velocity is not correctly *** time domain and frequency domain analysis results of pressure drop of each drag model are *** is recommended to use the drag model derived from DNS or fine grid computational fluid dynamics–discrete element method(CFD-DEM)data first for CFD-DEM *** the investigated BFB,the superficial gas velocity less than 0.9 m·s^(-1) should be adopted to obtain normal hydrodynamics.

关键词： MFIX-DEM Simulation Dense flow Gas-solid Bubbling fluidized bed Drag model

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Experimental Investigation on Product and Temperature Distribution in a Continuous flow Packed-Bed Reactor for Dodecahydro-N-Ethylcarbazole Dehydrogenation

SSRN

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SSRN 2024年

作者： Xue, Jingwen Li, Pengzhao Yu, Pengfei Yi, Jinhao Ma, Tao Liu, Hu Che, Defu State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'An710049 China

The dehydrogenation of dodecahydro-N-ethylcarbazole (H12-NEC) generates enormous gas accompanied by intense heat absorption, affecting heat and mass transfer in porous catalysts. A packed-bed reactor equipped with a temperature measurement device was designed to investigate the continuous flow dehydrogenation of H12-NEC. The effects of weight hourly space velocity (WHSV), reaction temperature, catalyst particle size, and pressure were evaluated. The results reveal that the volume flow rate of hydrogen will increase with the increase of WHSV. And the generation of hydrogen enhances heat transfer by strengthening the perturbation of flow. As the temperature rises, the hydrogen yield increases along with more by-products. The decrease of catalyst particle size improves the hydrogen yield and a more uniform temperature distribution can be created within the reactor due to the weakened wall effect. 456 K and 2 mm of catalyst particle size are determined to be the optimal reaction conditions in the study, achieving the hydrogen production rate of 9.61 [[EQUATION]]. With pressure increasing, the hydrogen yield gradually decreases, but the decreased evaporation of H12-NEC results in a smaller temperature difference between the reactor and heating wall. A comparison with the thermodynamic equilibrium model reveals that the effect of pressure on chemical equilibrium may be more significant than the temperature. © 2024, The Authors. All rights reserved.

关键词： Temperature distribution

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Preferential Formation of Ethylene via Electrocatalytic CO_(2) Reduction on Mesoporous Cu_(2)O Nanoparticles:Synergistic Effects of Pore Structure Confinement and Surface Amine

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Chinese Journal of Chemistry 2024年第16期42卷 1846-1852页

作者： Haifeng Zhang Dun Li Zhifang Chen Yingying Wang Haoyu Sun Feng Liu Maochang Liu Yiqun Zheng Hongwen Huang School of Chemistry Chemical Engineering and MaterialsJining UniversityQufuShandong 273155China College of Materials Science and Engineering Hunan UniversityChangshaHunan 410082China Health Management Department Shandong Vocational College of Light IndustryZiboShandong 255300China International Research Center for Renewable Energy National Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiotong UniversityXi'anShaanxi 710049China

We present a facile synthetic strategy to create mesoporous Cu_(2)O nanocrystals with tunable pore structures and surface functional groups of amine derivatives for efficient and preferable electrochemical conversion of CO_(2) into *** structural characteristics of theseCu_(2)O nanocrystals can be manipulated using a set of amine derivatives,such as pyridine,4,4'-bipyridine,and hexamethylenetetramine,during the oxidative etching process of Cu nanocrystals by bubbling gaseous oxygen in N,N-dimethylformamide *** amine derivatives not only serve as surface functional groups but also significantly affect the resulting pore *** synergistic effect of pore structure confinement and surface amine functionalization leads to the superb Faradaic efficiency(FE)of 51.9% for C_(2)H_(4),respectively,together with the C_(2)H_(4) partial current density of -209.4 mA·cm^(-2) at -0.8 V *** hydrogen electrode(RHE).The relatively high selectivity towards C_(2)H_(4) was investigated using DFT simulations,where 4,4'-bipyridine functionalized Cu_(2)O seemed to favor the C_(2)H_(4) formation with the low free energy of the *** study provides a feasible strategy to manipulate the pore structure and surface functionalization of mesoporous Cu_(2)O nanocrystals by regulating the oxidative etching process,which sheds light on the rational preparation of high-performance CO_(2)RR electrocatalysts.

关键词： Amines Ethylene Cuprous oxide CO_(2)reduction Mesoporous materials

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MULTIPLE SOLVERS FOR IMPLICIT TEMPERATURE CALCULATION OF HEAT CONDUCTION WITH THE MPS METHOD 15

MULTIPLE SOLVERS FOR IMPLICIT TEMPERATURE CALCULATION OF HEA...

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15th World Congress on Computational Mechanics and 8th Asian Pacific Congress on Computational Mechanics: Pursuing the Infinite Potential of Computational Mechanics, WCCM-APCOM 2022

作者： Li, Sijun Zhong, Yubao Cai, Qinghang Xiao, Xinkun Guo, Kailun Chen, Ronghua Tian, Wenxi Qiu, Suizheng Su, Guanghui School of Nuclear Science and Technology Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

In this study, an implicit algorithm and different solvers are applied to the Moving Particle Semi-Implicit (MPS) method for temperature calculation. The original MPS method uses an explicit method for temperature calculation and is limited by time increment due to diffusion number. In this paper, the heat conduction of plates with Dirichlet boundary condition and Neumann boundary condition is studied. The accuracy of explicit and implicit calculation of plate heat transfer cases are compared. In addition, different solvers are compared. Consequently, it is shown that the error of the implicit algorithm is not much different from the original one. And CG is still the better solver, CGS is also a superior solver. The implicit algorithm increases the size of a single time step by a maximum of 50 times (original diffusion number is 0.2), while the calculation time of a single time step does not increase Substantially, so it has a significant effect on the acceleration of calculation. © 2022 WCCM-APCOM 2022 - 15th World Congress on Computational Mechanics and 8th Asian Pacific Congress on Computational Mechanics: Pursuing the Infinite Potential of Computational Mechanics. All rights reserved.

关键词： Heat conduction

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An integrated flexible self-healing Zn-ion battery using dendrite-suppressible hydrogel electrolyte and free-standing electrodes for wearable electronics

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Nano Research 2023年第8期16卷 11000-11011页

作者： Jiawei Long Tianli Han Xirong Lin Yajun Zhu Yingyi Ding Jinyun Liu Huigang Zhang Key Laboratory of Functional Molecular Solids Ministry of EducationCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China National Key Laboratory of Science and Technology on Micro/Nano Fabrication Department of Micro/Nano-electronicsShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Among many aqueous batteries,flexible zinc-ion(Zn-ion)battery becomes the focus owing to the merits of low cost,non-toxicity,and ***,a Zn dendrite-suppressible hydrogel electrolyte with both flexible and self-healing properties is developed via photoinitiated *** cross-linked structure of the polyacrylamide-N,N'-methylenebisacrylamide(PAM-MBA)-Zn/Mn hydrogel endows an enlarged chemical stable window,high ionic conductivity,and low polarization *** cycling at the current density of 0.5 mA·cm^(−2)for 250 h,Zn‖Zn symmetrical cell based on PAM-MBA-Zn/Mn electrolyte delivers a low polarization of 40 *** suppressed dendrite growth is ascribed to the uniform Zn deposition/stripping on *** galvanostatic intermittent titration technique curves display that the Zn-ion battery constructed by the PAM-MBA-Zn/Mn hydrogel electrolyte,free-standing FeVO_(4)/carbon cloth cathode,and Zn nanosheets/carbon cloth anode presents low reaction resistance and fast diffusion coefficient,indicating good endurance of cycling at high current *** battery with PAM-MBA-Zn/Mn hydrogel electrolyte presents a good flexible and self-healing *** bending 0°,60°,90°,and 180°for 30 times,batteries deliver stable *** cutting into ten pieces,the battery could self-heal and display a potential retention of 93.7%compared to the fresh cell.A good rate-performance is also *** cutting/healing three times during cycling,capacity recovers well compared to the first-time cutting/***,the battery exhibits good flexibility using in an electric watch,indicating a promising potential for wearable electronics.

关键词： Zn-ion battery flexible self-healing dendrite growth cycling life

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Editorial: multiphase flow in energy studies and applications—A special issue for MTCUE-2022

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Physics of Fluids 2023年第7期35卷 1-7页

作者： Zhu, Li-Tao Xu, Fei Jin, Hui Xiong, Qingang Department of Chemical and Biological Engineering University of British Columbia VancouverBCV6T 1Z3 Canada School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai200240 China Electronics Business Unit Ansys Inc. AustinTX78746 United States State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangzhou510641 China

Establishing a clean, low-carbon, and efficient energy system is paramount for the sustainable development of industries and human society. multiphase flows are encountered extensively in various energy applications, including transportation, conversion, and utilization of fossil, renewable, hydrogen, and nuclear energies. These flows encompass a wide range of phenomena, such as fluid flow, heat and mass transfer, combustion, and chemical reactions. However, multiphase flows are highly intricate due to the coexistence of multiple phases, states, and components, as well as the interactions among them that occur across diverse spatiotemporal scales. Consequently, both academia and industry face significant challenges in comprehending and harnessing multiphase flows. Thus, establishing connections between basic research and industrial applications in the field of multiphase flows is fundamental and indispensable for advancements in energy science and technologies. © 2023 Author(s).

关键词： multiphase flow

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