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Effects of Fluid Inertia on Adhesion Behaviors of Elastic Capsules

Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2017年第4期38卷 776-780页

作者： Luo, Zheng-Yuan Bai, Bo-Feng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Elastic capsules (consisting of viscous fluid enclosed by elastic membranes) can form specific adhesion bonds with functionalized surface. Adhesion force in these bonds and viscous and inertial force in fluids determine adhesive dynamics of capsules under flow. In this paper, based on the front-tracking finite-element method we developed previously, we further combine the kinetic adhesion dynamics model and develop a three-dimensional model for adhesive dynamics of capsules, in which membrane elasticity, fluid inertia and viscosity can be considered simultaneously. The effects of fluid inertia on adhesive characteristics of capsules are investigated systematically. Results show that fluid inertia induces the increase of both drag and lift forces from the surrounding fluid. As a consequent, the detachment of the elastic capsule is promoted by fluid inertia. © 2017, Science Press. All right reserved.

关键词： Dynamics

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On the effects of shear and compositional inhomogeneities in turbulent, lean, premixed flames 11

On the effects of shear and compositional inhomogeneities in...

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11th Asia-Pacific Conference on Combustion, ASPACC 2017

作者： Steinmetz, S.A. Juddoo, M. Jin, W. Masri, A.R. School of Aerospace Mechanical and Mechatronic Engineering University of Sydney NSW2006 Australia State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xian710049 China

This paper presents some initial results on the separate effects of shear and compositional inhomogeneities on the global structure of turbulent lean piloted premixed flames. Shear is introduced by injecting the mixture in two streams through two concentric tubes at different velocities. Compositional inhomogeneity, for the same shear rate, is obtained by injecting air in the annulus and fuel or rich fuel-air mixtures through the inner jet which may be recessed upstream of the jet exit plane. It is found that increasing the shear inhomogeneity can lead to a shorter flame where the tip may transition from "open" to "closed". The latter refers to a "Bunsen-like" flame while an "open" flame has reacting edges that do not close at the tip. Compositional inhomogeneity seems to have little effects on the global structure despite the presence of mixture fraction gradients a noted from Rayleigh scattering performed the jet exit plane. Measurements of velocity fields and imaging of reaction zones will be performed to enable a better understanding of the structure of these flames and to locate them on the premixed flames regime diagram. © 2018 Combustion Institute. All Rights Reserved.

关键词： Mixtures

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Numerical study on the laminar flame characteristics of acetylene-methanol blends 11

Numerical study on the laminar flame characteristics of acet...

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11th Asia-Pacific Conference on Combustion, ASPACC 2017

作者： Li, Qianqian Zhang, Yemiao Zhang, Yingjia Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No. 28th Xianning West Road Xi’anShaanxi710049 China

Laminar flame characteristics of the blends of acetylene and methanol were numerically studied at 0.1 MPa and 363 K. A model was adopted to do the simulations with the accuracy validated with published laminar flame speeds data of methanol and acetylene. Simulation results showed that the methanol addition into acetylene leads to the significant increase of laminar flame speed with the equivalence ratio corresponding the maximum value shifting to the rich side. The reasons behind were analyzed and found the thermal and chemical kinetic effects both contribute the laminar flame speed variation while the contribution of the diffusion effect can be ignored. Besides, the equivalence ratio shift is found to be closely related to the adiabatic temperature and OH concentrations.

关键词： Acetylene

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Performance of V-Cone flowmeter applied to cryogenic fluid measurement considering cavitation

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IOP Conference Series: Earth and Environmental Science 2019年第6期240卷

作者： Denghui He Bofeng Bai Senlin Chen Jie Zhang Pengcheng Guo State Key Laboratory of Eco-hydraulic in Northwest Arid Region Xi'an University of Technology Xi'an 710048 Shaanxi China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi China

The V-Cone flowmeter is a promising differential pressure flowmeter for metering the cryogenic fluid for its many advantages. When the cryogen velocity increases to a certain value, the cavitation may occur in flowmeter, which may significantly affect the performance of V-Cone flowmeter. However, the effect of cavitation on performance of V-Cone flowmeter remains unclear and there are no published studies to our knowledge on this issue. Here we investigate the performance of V-Cone flowmeter when measuring the cryogenic fluids, especially the effects of cavitation on the discharge coefficient and pressure loss coefficient of the flowmeter. Two cryogenic fluids are investigated, including liquid nitrogen (LN2) and liquid hydrogen (LH2). For comparison, the water is also investigated. The realizable κ-ε model is used to describe the turbulence. The Schnerr-Sauer cavitation model is used to investigate the effect of cavitation on the performance of the V-Cone flowmeter. The results show that there was little effect of cavitation on the discharge coefficient and pressure loss coefficient at the initial stage of cavitation. When the cloud cavitation occurred downstream of V-Cone, the discharge coefficient decreases rapidly with Reynolds number increasing, while the pressure loss coefficient rises quickly. The average discharge coefficient is almost the same for different fluids in the stable region; while the cryogenic fluids have wider stable Reynolds number ranges than the water. The lower limits of the Reynolds number for the constant discharge coefficient is very close for three fluids, however, for the upper limits of Reynolds number are quite different. We conclude that measurement range of the cryogenic fluid is much larger than that of the water, which shows that the V-Cone flowmeter exhibits great potential in the measurement of cryogenic fluid. This study provides insights into the effect of cavitation on the measurement of V-Cone flowmeter and opens a new aven

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Experimental research on the characteristics of steam-water counter-current flow in the Pressurizer Surge Line assembly

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Experimental Thermal and Fluid Science 2018年 96卷 180-191页

作者： Jiangtao Yu Dalin Zhang Leitai Shi Zhiwei Wang Wenxi Tian G.H. Su S.Z. Qiu State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University 28 Xianning West Road Xi’an 710049 China Shaanxi Key Lab. of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University 28 Xianning West Road Xi’an 710049 China

To investigate Counter-Current flow (CCF) characteristics in the Pressurizer Surge Line (PZR SL) assembly of the large advanced passive nuclear reactors, steam-water CCF experiments are carried out on a stainless steel test section, which is a 1:4 scaled-down model of the AP1000 PZR SL assembly. The inner diameter of the test PZR SL pipe is 90 mm, which also belongs to the large-diameter pipes, as same as the prototype PZR SL pipe, in the field of Counter-Current flow Limitation (CCFL) researches. The present steam-water CCFL experiments are conducted under normal pressure and saturated temperature, with the PZR simulator collapse water level ranging from 350 to 900 mm. CCFL becomes severer at higher steam flow rate, and the most limiting CCFL effect locates between the PZR simulator bottom head and the vertical part of PZR SL pipe. The onset of CCFL and zero liquid penetration (ZP) are two critical conditions in the CCF development process, dividing the process into three stages: Before-CCFL, Partial-CCFL, and CCFL-ZP. According to the local CCFL conditions, the development of the CCFL process is also divided into four-regions since onset of CCFL. The present steam-water CCF data are well normalized in terms of dimensionless Kutateladze (Ku) numbers, and a Ku-type empirical partial CCFL correlation is developed. The comparisons of the present CCF data and partial CCFL correlation with the CCF data and correlations of former experiment researches validate that the present empirical partial CCFL correlation is conservative to predict steam-water partial CCFL in the prototype PZR SL assembly of the large advanced passive nuclear reactors.

关键词： Steam-water counter-current flow Partial CCFL correlation Pressurizer surge line assembly Advanced passive nuclear reactors ADS Automatic Depressurization System ADS1-3 First to Third Stages of ADS ADS4 Fourth Stage of ADS CCF Counter-Current flow CCFL Counter-Current flow Limitation CCFL-1 The 1st grade of CCFL region CCFL-2 The 2nd grade of CCFL region CCFL-3 The 3rd grade of CCFL region CCFL-L Local CCFL at the T-junction of HL pipe and PZR SL pipe CCFL-S Local CCFL along the PZR SL pipe CCFL-U Local CCFL at the location between the PZR simulator bottom head and vertical part of PZR SL pipe CCFL-ZP Zero liquid penetration region or stage CMT Core Makeup Tank COCF Co-Current flow HL Hot Leg IRWST In-containment Refueling Water Storage Tank Ku Kutateladze PRHR Passive Containment Cooling System PWRs Pressurized Water Reactors PZR SL Pressurizer Surge Line RC Reactor Core RCS Reactor Coolant System RPV Reactor Pressure Vessel SBLOCAs Small-Break Loss-of-Coolant Accidents ZP zero liquid penetration

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Optimization of the fuel rod＇s arrangement cooled by turbulentnanofluids flow in pressurized water reactor (PWR)

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Chinese Journal of Chemical engineering 2017年第6期25卷 722-731页

作者： M. Hatami MJ.Z. Ganfi I. Sohrabiasl D. Jing International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'anJiaotong University Xi'an 710049 China Department of Mechanical Engineering Esfarayen University of Technology Esfarayen North Khorasan lran Department of Renewable Energies Engineering Faculty of New Sdences & Technologies University of Tehran Tehran lran Department of Mechanical Engineering Babol University of Technology Babol lran

In this paper, response surface methodology(RSM) based on central composite design(CCD) is applied to obtain an optimization design for the fuel rod's diameter and distance cooled by turbulent Al_2O_3–water nanofluid for a typical pressurized water reactor(PWR). Fuel rods and nanofluid flow between them are simulated 3D using computational fluid dynamics(CFD) by ANSYS-FLUNET package software. The RNG k–ε model is used to simulate turbulent nanofluid flow between the rods. The effect of different nanoparticles concentration is also investigated on the Nusselt number from heat transfer efficiency view point. Results reveal that when distance parameter(a) is in the minimum level and diameter parameter(r) is in the maximum possible level, cooling the rods will be better due to higher Nusselt number in this situation. Also, using the different nanoparticles on the cooling process confirms that Al_2O_3 averagely 17% and TiO_2 10% improve the Nusselt numbers.

关键词： Optimization Fuel rods Nanofluid Pressurized water reactor

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Solar Hydrocarbons: Single-Step, Atmospheric-Pressure Synthesis of C2−C4Alkanes and Alkenes from CO2

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Angewandte Chemie 2023年第27期135卷

作者： Rui Song Zhao Li Jiuli Guo Paul N. Duchesne Chenyue Qiu Chengliang Mao Jia Jia Sanli Tang Yang-Fan Xu Wenzhe Zhou Lu Wang Wei Sun Xiaoliang Yan Liejin Guo Dengwei Jing Geoffrey A. Ozin International Research Center for Renewable Energy & State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China Solar Fuels Group Department of Chemistry University of Toronto 80 St. George Street Toronto Ontario M5S 3H6 Canada Contribution: Conceptualization (equal) Data curation (lead) Formal analysis (lead) Investigation (lead) Methodology (lead) Writing - original draft (equal) Contribution: Data curation (supporting) Formal analysis (equal) Writing - original draft (supporting) School of Chemistry and Chemical Engineering Anyang Normal University Anyang Henan 455000 P. R. China Contribution: Data curation (supporting) Formal analysis (supporting) Methodology (equal) Software (supporting) Writing - original draft (supporting) Contribution: Data curation (supporting) Software (lead) Department of Materials Science and Engineering University of Toronto Toronto Ontario M5S 3E4 Canada Contribution: Data curation (supporting) Contribution: Conceptualization (supporting) Contribution: Formal analysis (supporting) Contribution: Methodology (supporting) State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang University Hangzhou Zhejiang 310058 China Contribution: Project administration (supporting) Contribution: Conceptualization (lead) Formal analysis (lead) Funding acquisition (equal) Project administration (equal) Supervision (equal) Writing - original draft (lead) Contribution: Conceptualization (lead) Funding acquisition (equal) Project administration (equal) Writing - original draft (lead)

Cobalt ferrite (CoFe 2 O 4 ) spinel has been found to produce C 2 −C 4 hydrocarbons in a single-step, ambient-pressure, photocatalytic hydrogenation of CO 2 with a rate of 1.1 mmol g −1 h −1 , selectivity of 29.8 % and conversion yield of 12.9 %. On stream the CoFe 2 O 4 reconstructs to a CoFe−CoFe 2 O 4 alloy-spinel nanocomposite which facilitates the light-assisted transformation of CO 2 to CO and hydrogenation of the CO to C 2 −C 4 hydrocarbons. Promising results obtained from a laboratory demonstrator bode well for the development of a solar hydrocarbon pilot refinery.

关键词： C2−C4 Hydrocarbons CO2 Hydrogenation Cobalt Ferrite Photocatalysis

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Experimental Study on Heat Transfer Characteristics of Static Flash Evaporation Process

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Energy Procedia 2017年 105卷 4776-4781页

作者： Qingzhong Yang Dan Zhang Daotong Chong Yu Wang Junjie Yan State Key Laboratory of Multiphase Flow in Power Engineering School of Energy & Power Engineering Xi’an Jiaotong University Xi’an Shaan

An experimental study on flash evaporation process in static flash evaporation of aqueous NaCl solution was presented. Experiments were carried out with initial concentration of waterfilm varied from 0 to 0.15, initial height from 0.1 to 0.4 m, and superheat from 1.8 to 49.5 K. Instant superheat was the driving force during flash evaporation. A negative correlation was found between temperature drop rate and instant superheat. Instant heat transfer coefficient increased with the increase of instant superheat. A peak value of instant superheat existed during static flash. The evolution of instant superheat was affected by initial superheat, or initial height, or initial concentration of waterfilm.

关键词： Static flash evaporation Instant superheat Aqueous NaCl solution temperature drop rate

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Sand particle lift-off velocity measurements and numerical simulation of mass flux distributions in a wind tunnel

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Journal of Arid Land 2017年第3期9卷 331-344页

作者： XIAO Fengjun DONG Zhibao GUO Liejin WANG Yueshe LI Debiao National Demonstration Center for Experimental Geography Education College of Tourism and Environment Shaanxi Normal University Xi'an 710119 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Xi'an Special Equipment Inspection Institute Xi'an 710065 China

Lift-off velocity of saltating sand particles in wind-blown sand located at 1.0 mm above the sand bed surface was measured using a phase Doppler particle analyzer in a wind tunnel. The results show that the probability distribution of lift-off velocity can be expressed as a lognormal function, while that of lift-off angle follows an exponential function. The probability distribution of lift-off angle conditioned for each lift-off velocity also follows an exponential function, with a slope that becomes steeper with increasing lift-off velocity. This implies that the probability distribution of lift-off velocity is strongly dependent on the lift-off angle. However, these lift-off parameters are generally treated as an independent joint probability distribution in the literature. Numerical simulations were carried out to investigate the effects of conditional versus independent joint probability distributions on the vertical sand mass flux distribution. The simulation results derived from the conditional joint probability distribution agree much better with experimental data than those from the independent ones. Thus, it is better to describe the lift-off velocity of saltating sand particles using the conditional joint probability distribution. These results improve our understanding of saltation processes in wind-blown sand.

关键词： lift-off velocity lift-off angle joint probability distribution sand mass flux saltation

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Sa2045 MAGNETIC ANCHORING ASSISTED ENDOSCOPIC IRREVERSIBLE ELECTROPORATION FOR GASTRIC MUCOSAL ABLATION: A PRECLINICAL FEASIBILITY STUDY IN CANINE MODEL

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Gastrointestinal Endoscopy 2020年第6期91卷 AB257-AB257页

作者： Fenggang Ren Qingshan Li Xuyao Gao Yuchi Zhang Jing Zhang Zhuoqun Li Dake Chu Zheng Wu Rongqian Wu Yi Lv National Local Joint Engineering Research Center for Precision Surgery and Regenerative Medicine First Affiliated Hospital of Xi’an Jiaotong University Xi'an China Department of Hepatobiliary Surgery First Affiliated Hospital of Xi’an Jiaotong University Xi'an China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China Department of Gastroenterology First Affiliated Hospital of Xi’an Jiaotong University Xi'an China

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