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Numerical investigation on characteristics of interfacial wave of liquid film in gas-liquid two-phase flow using OpenFOAM

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Chinese Journal of Aeronautics 2024年第2期37卷 233-248页

作者： Xiaoqi MA yueshe wang Jiaming TIAN State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China

Liquid film cooling as an advanced cooling technology is widely used in space *** operation of liquid film along the rocket combustion inner wall is crucial for thermal protection of rocket *** stability of liquid film is mainly determined by the characteristics of interfacial wave,which is rarely investigated right *** to improve the stability of thin film has become a hot *** view of this,an advanced model based on the conventional Volume of Fluid(VOF)model is adopted to investigate the characteristics of interfacial wave in gas-liquid flow by using OpenFOAM,and the mechanism of formation and development of wave is revealed intuitively through numerical *** effects from gas velocity,surface tension and dynamic viscosity of liquid(three factors)on the wave are studied *** can be found that the gas velocity is critical to the formation and development of wave,and four modes of droplets generation are illustrated in this ***,a gas vortex near the gas-liquid interface can induce formation of wave easily,so changing the gas vortex state can regulate formation and development of ***’s more,the change rules of three factors influencing on the interfacial wave are obtained,and the surface tension has a negative effect on the formation and development of wave only when the surface tension coefficient is above the critical value,whereas the dynamic viscosity has a positive effect in this ***,the maximum height and maximum slope angle of wave will level off as the gas velocity ***,the maximum slope angle of wave is usually no more than 38°,no matter what happens to the three factors.

关键词： Interfacial wave Gas-liquid Two-phase flow VOF model OpenFOAM

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安全壳内放射性气溶胶输运特性模拟研究

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核动力工程 2024年第2期45卷 88-95页

作者：田家铭王跃社李彪邹琳西安交通大学动力工程多相流国家重点实验室西安710049

为探明实际安全壳尺寸下严重事故中放射性气溶胶的输运特征,利用计算流体动力学和颗粒群平衡方程耦合,模拟了严重事故中放射性气溶胶在安全壳内的空间分布规律,并重点定量分析了不同聚并机制和沉积机制对于气溶胶输运过程的影响。结果表... 详细信息

为探明实际安全壳尺寸下严重事故中放射性气溶胶的输运特征,利用计算流体动力学和颗粒群平衡方程耦合,模拟了严重事故中放射性气溶胶在安全壳内的空间分布规律,并重点定量分析了不同聚并机制和沉积机制对于气溶胶输运过程的影响。结果表明,粒径小于0.1μm的气溶胶颗粒的相互作用主要受布朗聚并影响,粒径大于10μm的主要受湍流惯性聚并影响,粒径介于两者之间的受布朗聚并和湍流聚并(湍流惯性聚并和湍流剪切聚并)共同影响。对于沉积现象,粒径小于0.1μm的气溶胶主要受布朗扩散沉积影响,粒径大于0.1μm的主要受重力沉积影响。湍流聚并的平均聚并速度是布朗聚并速度的2.99倍,布朗扩散沉积的平均沉积速率是重力沉积的1.38倍。本研究为实际安全壳尺寸下放射性气溶胶去除技术的选取提供了解决思路。

关键词：安全壳气溶胶颗粒群平衡聚并沉积输运性质

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Discrete particle simulation of mixed sand transport

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Particuology 2012年第2期10卷 221-228页

作者： Fengjiun Xiao Lieiin Guo Debiao Li yueshe wang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

An Eulerian/Lagrangian numerical simulation is performed on mixed sand transport. Volume averaged Navier-Stokes equations are solved to calculate gas motion, and particle motion is calculated using Newton＇s equation, involving a hard sphere model to describe particle-to-particle and particle-to-wall collisions. The influence of wall characteristics, size distribution of sand particles and boundary layer depth on vertical distribution of sand mass flux and particle mean horizontal velocity is analyzed, suggesting that all these three factors affect sand transport at different levels. In all cases, for small size groups, sand mass flux first increases with height and then decreases while for large size groups, it decreases exponen- tially with height and for middle size groups the behavior is in-between. The mean horizontal velocity for all size groups well fits experimental data, that is, increasing logarithmically with height in the middle height region. Wall characteristics greatly affects particle to wall collision and makes the fiat bed similar to a Gobi surface and the rough bed similar to a sandy surface. Particle size distribution largely affects the sand mass flux and the highest heights they can reach especially for larger particles.

关键词： Mixed sand transportHard sphere modelSand mass fluxParticle horizontal mean velocity

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Multi-physics analysis of the galvanic corrosion of Mg-steel couple under the influence of time-dependent anisotropic deposition film

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Journal of Magnesium and Alloys 2021年第3期9卷 866-882页

作者： Kai wang Chenpei Li Yanhui Li Jinling Lu yueshe wang Xingqi Luo State Key Laboratory of Eco-hydraulics in Northwest Arid Region Xi'an University of TechnologyNo.5 Jinhua South RoadXi'an 710048China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityNo.28 Xianning West RoadXi'an 710049China

The anisotropic deposit film formed during the galvanic corrosion can impede the mass transfer of the involved species,thereby affecting the electro-chemical behavior and the evolution of galvanic *** limitations of experimental studies in the spatial-temporal scales restrict a deeper understanding of the corrosion mechanism,which can be complemented by numerical simulation.A multi-physics coupled model is proposed in this work to systematically investigate the temporal and spatial evolution of galvanic corrosion of the Mg-steel couple with the growing anisotropic deposition *** utilizing the multi-physics field coupled technique,various coupled physical-chemical processes underlying the corrosion behavior are built into the model,including chemical reactions,ionic mass transfer in the bulk solution and the deposition layer,interfacial reaction,deposition of corrosion products as well as the morphological transitions caused by metal dissolution and *** particular,the anisotropic deposit film is considered to be a porous layer with a porosity varying in time and space as the corrosion *** predicted corrosion morphology by this model is better than the previous *** coupled relationship between the electrochemical behavior(e.g.,electrode reaction kinetics,current density,surface potential)and the physical processes(e.g.,ionic transport,geometric evolution of metal surface and film interface)is *** results indicate that a porous deposition layer with a denser inner layer and a loose outer layer is generated,leading to more significant inhibition of mass transfer in the inner layer than the outer *** anisotropism of the deposition layer results in a non-uniform conductivity distribution and a discontinuous current density distribution in the *** current density on the electrode surface is inhibited by the deposition layer and the variation in the cathode/anode area ratio during the corrosion *** c

关键词： Galvanic corrosion Corrosion product film Modeling Mass transport Porosity

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Insight into the interaction between water and surfactant aerosol particles based on molecular dynamics simulations

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颗粒学报:英文版 2023年第6期77卷 128-135页

作者： Chao Zhang Zhichao Zhang Longxiang Bu Yang Yang Wei Xiong yueshe wang School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and TechnologyShanghai200093China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an710049China

The ubiquitous surfactant significantly influences the hygroscopic growth of atmospheric aerosol ***,knowledge on the morphology of surfactant particles after the adsorption of water is *** this study,the interaction between water and particles composed of surface active malonic acid(MA)or adipic acid(AA)are simulated based on the molecular dynamics *** key point is the combined effect of temperature and water content on the structural properties of particles and the surface propensity of surfactants at the equilibrium *** show that demixed structure 1 with the adsorption of water clusters on acid grain,mixed structure and demixed structure 2 with acids coating on water droplet can be *** temperature increasing from 160 K to 330 K the surface propensity of MA and AA increases first and then *** the standard atmospheric temperature(280-330 K),the surface propensity of MA and AA increases with increasing water content and alkyl group,and its sensitivity to temperature and water content varies ***,all surfactants at the particle surface orient their hydrophobic groups toward the *** findings improve our insight into the surfactant partitioning and further assist in more accurate prediction of the particle hygroscopic growth.

关键词： Aerosol particles Surfactant Surface propensity Hygroscopic growth Molecular dynamics

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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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单喷嘴低压引射器的结构设计与数值分析

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化工进展 2017年第B11期36卷 107-114页

作者：尚阳王跃社西安交通大学动力工程多相流国家重点实验室陕西西安710049

引射器作为大气式燃烧器的重要组件,对燃烧器的稳定、完全燃烧具有重要的影响,因此对引射器的工作过程和影响其工作性能因素的研究尤为重要。本文首先对大气式燃烧器用的单喷嘴低压引射器的结构形式及具体尺寸进行了设计,并对设计出的... 详细信息

引射器作为大气式燃烧器的重要组件,对燃烧器的稳定、完全燃烧具有重要的影响,因此对引射器的工作过程和影响其工作性能因素的研究尤为重要。本文首先对大气式燃烧器用的单喷嘴低压引射器的结构形式及具体尺寸进行了设计,并对设计出的引射器建立了三维、稳态的数学模型。然后利用计算流体力学(computational fluid dynamics,CFD)软件对引射器进行了模拟计算,探究了引射器内燃气与空气发生动量和质量交换的混合过程并研究了工作喷嘴出口直径、混合室长度、燃气供气压力、引射器出口背压4个因素对引射器质量流量引射系数的影响。研究结果表明:当引射器其他参数相同时,工作喷嘴出口直径与混合管长度都存在一个最佳值使得引射器达到最优的引射系数;燃气供气压力增大对引射系数的影响很小,引射系数几乎不变,而当引射器出口背压增大时,引射系数却下降的很快。

关键词：单喷嘴低压引射器结构设计混合质量流量引射系数数值分析

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Numerical simulation of predicting and reducing solid particle erosion of solid-liquid two-phase flow in a choke

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Petroleum Science 2009年第1期6卷 91-97页

作者： Li Guomei wang yueshe He Renyang Cao Xuewen Lin Changzhi Meng Tao State Key Laboratory of Multiphase Flow in Power Engineering Xi＇an Jiaotong University Xi＇an Shaanxi 710049 China China Special Equipment Inspection and Research Institute Beijing 100013 China School of Transport ＆ Storage and Civil Engineering China University of Petroleum Qingdao Shandong 266555 China Petroleum Exploration and Production Research Institute Sinopec Beijing 100083 China

Chokes are one of the most important components of downhole flow-control equipment. The particle erosion mathematical model, which considers particle-particle interaction, was established and used to simulate solid particle movement as well as particle erosion characteristics of the solid-liquid two-phase flow in a choke. The corresponding erosion reduction approach by setting ribs on the inner wall of the choke was advanced. This mathematical model includes three parts： the flow field simulation of the continuous carrier fluid by an Eulerian approach, the particle interaction simulation using the discrete particle hard sphere model by a Lagrangian approach and calculation of erosion rate using semiempirical correlations. The results show that particles accumulated in a narrow region from inlet to outlet of the choke and the dominating factor affecting particle motion is the fluid drag force. As a result, the optimization of rib geometrical parameters indicates that good anti-erosion performance can be achieved by four ribs, each of them with a height （H） of 3 mm and a width （B） of 5 mm equaling the interval between ribs （L）.

关键词： Solid-liquid two-phase flow discrete particle hard sphere model choke erosion rate antierosion numerical simulation

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Experimental Study on Convective Boiling Heat Transfer in Vertical Narrow-Gap Annular Tube

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Journal of Thermal Science 2001年第2期10卷 148-152页

作者： Li Bin He Anding wang yueshe Zhou Fangde The National Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China The National Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049 China

Experiments are conducted to investigate the characteristics of single-phase forced-flow convection and boiling heat transfer of R113 flowing through annular tube with gap of l, 1.5 and 2.5 mm. and also the visualization test are carried out to get two-phase flow regime. The data show that the Nusselt numbers for the narrow-gap are higher than those predicted by traditional large channel correlation and boiling heat transfer is enhanced. Based on the data obtained in this investigation, correlations for single-phase, forced convection and flow boiling in annular tube of different gap size has been developed.

关键词： annular tube single-phase forced convection boiling heat transfer narrow gap.

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变热负荷下蒸发面流量分配的试验与模拟研究

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太阳能学报 2019年第1期40卷 38-43页

作者：郝芸王跃社胡甜邓倩西安交通大学动力工程多相流国家重点实验室西安710049

塔式太阳能热发电系统中,由于定日镜场的聚焦作用使得腔式吸热器受热面局部区域热负荷高度集中且随时间和空间不断变化导致吸热器系统工质流量分配特性恶化。该文以吸热器蒸发受热面水动力特性的试验平台为研究对象,结合吸热器内辐射-... 详细信息

塔式太阳能热发电系统中,由于定日镜场的聚焦作用使得腔式吸热器受热面局部区域热负荷高度集中且随时间和空间不断变化导致吸热器系统工质流量分配特性恶化。该文以吸热器蒸发受热面水动力特性的试验平台为研究对象,结合吸热器内辐射-对流的能量传递过程,建立受热管内工质流动换热计算模型,在此基础上建立非均匀热负荷分布条件下腔式吸热器水动力计算的非线性数学模型,得出不同工况下蒸发受热面内工质的流量分配规律。

关键词：太阳能发电热负荷流体动力学数值模型

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