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12th Asia-Pacific Conference on Combustion, ASPACC 2019

作者： Yang, Meng Tang, Chenglong Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xianning West Road Xi'an Shaanxi710049 China

In this work, the auto-ignition experiments of nitromethane at the low to intermediate temperature, fuel concentration of 2%, pressure of 30 bar and different equivalence ratios have been investigated by using rapid compression machine. The pressure profiles of nitromethane ignition were observed. Results show that a distinct two-stage heat release process is found at ? = 0.5. And multi-stage heat release is also observed with temperature decreasing. Subsequently, the effect of equivalence ratio on the nitromethane ignition is performed. The results show that the dependence of nitromethane ignition on the equivalence ratio is weak. In addition, the experimental data are used to validate the recent developed mechanisms of nitromethane. Relative large deviations are observed between experiments and predictions. © Asia-Pacific Conference on Combustion, ASPACC *** right reserved.

关键词： Combustion

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Performance of cone meter for measuring cryogenic fluid considering cavitation

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International Journal of Fluid Machinery and Systems 2019年第1期12卷 12-21页

作者： He, Denghui Chang, Zhuang Bai, Bofeng Chen, Senlin Guo, Pengcheng State Key Laboratory of Eco-hydraulic in Northwest Arid Region Xi’an University of Technology NO.5 South Jinhua Road Xi’an710048 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University No.28 Xianning West Road Xi’an710049 China

The performance of the cone meter when measuring the cryogenic fluid was investigated by numerical simulation. The results show that the discharge coefficient and pressure loss coefficient of the cone meter are almost constant when the Reynolds number in the "stable region". The cryogenic fluids, especially the liquid hydrogen, have wider stable Reynolds number ranges than the water. There is little effect of cavitation on the discharge coefficient and pressure loss coefficient at the initial stage of cavitation. Thus the effect of slight cavitation on the measurement error of the flow rate is small, whose relative error is less than ±0.5% in present cases. This study opens a new avenue for measuring the flow rate of the cryogenic fluid. © 2019, Turbomachinery Society of Japan. All rights reserved.

关键词： Cavitation

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Performance of different flocculants for harvesting Chlorella vulgaris by dissolved air flotation and sedimentation

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Bioresource technology 2025年 433卷 132743页

作者： X Wei N R H Rao S Tyagi W Thielemans W Cao L J Guo K Muylaert State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi China Laboratory of Aquatic Biology KU Leuven Campus Kulak Kortrijk 8500 Kortrijk Belgium. Laboratory of Aquatic Biology KU Leuven Campus Kulak Kortrijk 8500 Kortrijk Belgium Sustainable Materials Laboratory Department of Chemical Engineering KU Leuven Campus Kulak Kortrijk 8500 Kortrijk Belgium. Electronic address: n.hanumanthrao@unsw.edu.au. Sustainable Materials Laboratory Department of Chemical Engineering KU Leuven Campus Kulak Kortrijk 8500 Kortrijk Belgium. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi China. Electronic address: caowenxjtu@***. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi China. Electronic address: lj-guo@***. Laboratory of Aquatic Biology KU Leuven Campus Kulak Kortrijk 8500 Kortrijk Belgium. Electronic address: koenraad.muylaert@kuleuven.be.

This study systematically evaluated the performance of dissolved air flotation and sedimentation for harvesting Chlorella vulgaris using eight different flocculants. Significant variation was observed in both the maximum harvesting efficiency and the minimum effective flocculant dose across different flocculant-process combinations. Among the tested flocculants, pyridinium modified cellulose nanocrystals achieved the highest harvesting efficiency of 99 % in both dissolved air flotation and sedimentation, while chitosan required the lowest minimum flocculant dose (∼2 mg·g) to induce flocculation. The impact of floc size formed during the flocculation step on harvesting performance was also investigated, revealing that large flocs significantly favored sedimentation-based microalgae harvesting. A preliminary cost analysis highlighted the importance of integrating economic considerations into the selection of both flocculant and harvesting method. The findings suggest that optimal flocculant and process selection should be based not only on harvesting efficiency but also on cost-effectiveness for microalgal biomass recovery.

关键词： Cationic flocculants Dissolved air flotation optimization Floc size distribution Microalgal recovery Water treatment

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Characterizing the catalyst fluidization with field synergy to improve the amine absorption for CO2 capture

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Chinese Journal of Chemical Engineering 2019年第7期27卷 1608-1617页

作者： Yunsong Yu Chen Zhang Zaoxiao Zhang Geoff Wang School of Chemical Engineering and Technology Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China School of Chemical Engineering The University of QueenslandSt LuciaQLD 4072Australia

There are great interests to capture the CO2 to control the greenhouse gas *** absorption of CO2 is being taken as an effective way to capture CO2 in ***,the amine absorption of CO2 is cost-ineffective due to great energy consumption and solution *** order to reduce the capture cost,catalyst fluidization is proposed here to intensify the mass transfer and heat *** fluidization with field synergy and DFT model is developed by incorporating the effects of catalyst reaction kinetics,drag force and multi-field into the mass transfer,heat transfer,fluid flow and catalyst *** with an improved distributor are performed well to validate the *** reaction kinetics is determined by the DFT simulation and *** mass transfer coefficient in the fluidized reactor is identified as 17%higher than the conventional packed *** the field synergy of catalyst fluidization,the energy consumption for CO2 desorption is reduced by 9%.Stepwise operation and inclination reactor are used to improve catalyst fluidization process.

关键词： CO2 capture Catalyst fluidization Mass transfer DFT Energy consumption Field synergy

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PREFACE: SPECIAL ISSUE FOR THE 2ND INTERNATIONAL SYMPOSIUM ON THERMAL-FLUID DYNAMICS (ISTFD2021)

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Heat Transfer Research 2022年第8期53卷 V-VI页

作者： Cheng, Lixin Bai, Bofeng Guo, Zhixiong School of Energy and Power Engineering Beijing University of Technology Beijing100124 China Department of Engineering and Mathematics Sheffield Hallam University SheffieldS1 1WB United Kingdom State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Department of Mechanical and Aerospace Engineering Rutgers The State University of New Jersey PiscatawayNJ08854 United States

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Combustion and heat transfer characteristics of a 300 MW pulverized-coal boiler retrofitted with biogas co-combustion

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Thermal Science and Engineering Progress 2025年

作者： Fengxia An Fanhui Shen Zhaoping Zhong Yunan Chen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Nanjing 210096 China China Energy Science and Technology Research Institute Co. Ltd. Nanjing 210023 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

Biomass co-combustion is an important measure to reduce the carbon dioxide emissions for pulverized-coal boilers. However, little work has been done to reveal the change in the heat transfer performance of retrofitted boilers. In this paper, the heat transfer process of furnace heating surfaces in a 300 MW pulverized-coal boiler with biogas co-combustion is invested by numerical simulation which combines the three-dimensional (3D) CFD model for combustion and heat transfer process of flue gas and the one-dimensional (1D) analytical model for the working fluid. The following conclusions can be drawn: the completeness of fuel combustion will be improved when biogas is injected into the furnace, and the peak concentration of carbon monoxide (CO) in the primary combustion zone decreases from 2.5 % to 0.93 % when the biogas co-combustion ratio increases from 0 % to 30 %, indicating that the risk of high-temperature corrosion on the water wall can be reduced. The 30 % biogas co-firing scheme with the biogas injection positions being both SA-1 and SOFA-3 is best in all cases studied in this work, because the temperature in the furnace and the heat transfer between the flue gas and the working fluid are most uniform, which contributes to the high boiler efficiency, low thermal NO x formation and good flexibility. Co-combusting 30 % biogas can increase the outlet working fluid dryness from 0.39 to 0.53 at the outlet of waterwalls, leading to an increase in the heat absorption in the furnace and a decrease in heat absorption at the tail convective heating surfaces, which should be considered carefully in the operation of the biogas co-combustion boilers. The research findings of this paper will provide technical support for the operation and control of pulverized-coal boilers co-firing biogas.

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Full-core normal and preliminary transient analysis for SiC-based rod designs 14

Full-core normal and preliminary transient analysis for SiC-...

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14th International Nuclear Fuel Cycle Conference, GLOBAL 2019 and Light Water Reactor Fuel Performance Conference, TOP FUEL 2019

作者： He, Yanan Deng, Yangbin Wu, Yingwei Shirvan, Koroush Department of Nuclear Science and Engineering MIT CambridgeMA02139 United States State Key Laboratory of Multiphase Flow in Power Engineering Department of Nuclear Science and Technology Xi'an Jiaotong University Xi'an City710049 China College of Physics and Energy Shenzhen University Shenzhen518060 China

When introducing a new fuel concept in traditional light water reactors (LWRs), analyzing its performance under a variety of power histories while attempting to simulate its stress state as realistic as possible is desired. By having access to such capability, the fuel developer can assess the safety characteristics of the new fuel concept and optimize its design performance. SiC/SiC Ceramic Matrix Composite (CMC) with chemically vapor deposited (CVD) SiC, is an accident tolerant fuel (ATF) concept owing to its high mechanical strength and remarkably enhanced oxidation-resistance. The modeling of SiC cladding requires capability to simulate multilayers and capture the nonlinear response of SiC material under neutron radiation. In addition, considering its probabilistic failure characteristics, efficient running fuel performance tools are required to assess its initial safety performance and optimize its design. In this work, we added a multi-layer deformation model in FRAPCON-4.0 and FRAPTRAN-2.0, with the primary motivation to analyze the performance of SiC cladding for UO2, annular UO2 and U3Si2 fuels from a full core point-of-view. We then performed reactivity-initiated accident (RIA) and loss-of-coolant accident (LOCA) for the limiting rod. During normal conditions, the failure risk of SiC cladding is mainly determined by pellet-cladding mechanical interaction (PCMI) and U3Si2 is a more promising fuel compared to UO2. While promising performance was simulated during LOCA for all fuels, during RIA, U3Si2 performance was found to be likely more limiting compared to UO2. Results show that the full core simulation methods developed for this work are robust and computationally efficient and can be adopted for other ATF design analysis. Copyright © GLOBAL 2019 - International Nuclear Fuel Cycle Conference and TOP FUEL 2019 - Light Water Reactor Fuel Performance *** rights reserved.

关键词： Silicon carbide

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Exploring Geometric Chirality in Nanocrystals for Boosting Solar-to-Hydrogen Conversion

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Angewandte Chemie 2024年第45期136卷

作者： Wenlong Fu Qi Gao Chunyang Zhang Lili Tan Biao Jiang Chengyu Xiao Prof. Maochang Liu Prof. Peng-peng Wang State Key Laboratory for Mechanical Behavior of Materials Shaanxi International Research Center for Soft Matter School of Materials Science and Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 PR China International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 PR China

Advancing catalyst design is pivotal for the enhancement of photocatalytic processes in renewable energy conversion. The incorporation of structural chirality into conventional inorganic solar hydrogen nanocatalysts promises a significant transformation in catalysis, a feature absent in this field. Here we unveil the unexplored potential of geometric chirality by creating a chiral composite that integrates geometric chiral Au nanoparticles (NPs) with two-dimensional C 3 N 4 nanosheets, significantly boosting photocatalytic H 2 evolution beyond the achiral counterparts. The superior performance is driven by the geometric chirality of Au NPs, which facilitates efficient charge carrier separation through the favorable C 3 N 4 -chiral Au NP interface and chiral induced spin polarization, and exploits high-activity facets within the concave surfaces of chiral Au NPs. The resulting synergistic effect leads to a remarkable increase in photocatalytic H 2 evolution, with an apparent quantum yield of 44.64 % at 400 nm. Furthermore, we explore the selective polarized photo-induced carrier separation behavior, revealing a distinct chiral-dependent photocatalytic HER performance. Our work advances the design and utilization of chiral inorganic nanostructures for superior performance in energy conversion processes.

关键词： Geometric chirality Nanoparticles Photocatalytic hydrogen evolution reaction Chiral effect

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Cyclone separation in a supercritical water circulating fluidized bed reactor for coallbiomass gasification： Structural design and numerical analysis

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Particuology 2018年第4期16卷 55-67页

作者： Guoxing Li Youjun Lu State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China

A new concept of a supercritical water （SCW） circulating fiuidized bed reactor is proposed to produce hydrogen from coal/biomass gasification. The cyclone is a key component of the reactor system, in this paper, cyclones with a single circular inlet （SCI） or a double circular inlet （DCI） were designed to adapt to the supercritical conditions. We evaluated the separation performance of the two cyclones using numerical simulations. A three-dimensional Reynolds stress model was used to simulate the turbulent flow of the fluid, and a stochastic Lagrangian model was used to simulate the particle motion. The flow fields of both cyclones were three-dimensionally unsteady and similar to those of traditional gas-solid cyclones. Secondary circulation phenomena were discovered and their influence on particle separation was estimated. Analyzing the distribution of the turbulence kinetic energy revealed that the most intensive turbulence existed in the zone near the vortex finder while the flow in the central part was relatively stable. The particle concentration distribution was non-uniform because of centrifugal forces. The distribution area can be divided into three parts according to the motion of the particles. In addition, the separation efficiency of both cyclones increased with the inlet SCaN velocity. Because of its perturbance flow, the DCI separator had higher separation efficiency than the SCI separator under comparable simulations. However, this was at the expense of a higher pressure drop across the cyclone.

关键词： CycloneStructural design Supercritical water-solid flow Separation performance Circulating fluidized bed Computational fluid dynamics

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MHD Simulations Preliminarily Predict The Habitability and Radio Emission of TRAPPIST-1e

arXiv

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arXiv 2025年

作者： Wang, BoRui Ye, ShengYi Varela, J. Luo, XinYi Department of Earth and Space Sciences Southern University of Science and Technology Shenzhen518055 China Institute for Fusion Studies University of Texas AustinTX78712 United States State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China

Context. As the closest Earth-like exoplanet within the habitable zone of the M-dwarf star TRAPPIST-1, TRAPPIST-1e exhibits a magnetic field topology that is dependent on space weather conditions. Variations in these conditions influence its habitability and contribute to its radio emissions. Aims. Our objective is to analyze the response of different terrestrial magnetosphere structures of TRAPPIST-1e to various space weather conditions, including events analogous to coronal mass ejections (CMEs). We assess its habitability by computing the magnetopause standoff distance and predict the resulting radio emissions using scaling laws. This study provides some priors for future radio observations. Methods. We perform three-dimensional magnetohydrodynamic (MHD) simulations of the TRAPPIST-1e system using the PLUTO code in spherical coordinates. Assuming TRAPPIST-1e possesses various Earth-like magnetospheres, we analyze the impact of four distinct space weather conditions on its magnetospheric topology. The space weather parameters range from sub-Alfvénic conditions to CMEs. Results. Our analysis indicates that the predicted habitability and radio emission of TRAPPIST-1e strongly depend on the planet’s magnetic field intensity and magnetic axis inclination. Within sub-Alfvénic, super-Alfvénic, and transitional stellar wind regimes, the radio emission intensity positively correlates with both planetary magnetic field strength and axial tilt, while planetary habitability, quantified by the magnetopause standoff distance, shows a positive correlation with magnetic field strength and a negative correlation with magnetic axis tilt. If TRAPPIST-1e possesses a magnetic field strength and axial tilt comparable to Earth’s (∼ 0.32G and ∼ 23.5◦). its magnetosphere can effectively shield the planetary surface from stellar wind erosion even under severe space weather conditions (e.g., CME events). However, for larger axial tilts (∼ 45◦), a stronger planetary magnetic field would be

关键词： Plasma magnetohydrodynamic waves

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