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Effects of Inertia and Viscosity on Single Droplet deformation in Confined Shear Flow

Communications in Computational Physics 2013年第3期13卷 706-724页

作者： Samaneh Farokhirad Taehun Lee Jeffrey F.Morris Department of Mechanical Engineering City College of City University of New YorkNew YorkNew York 10031USA Department of Chemical Engineering and Levich Institute City College of City University of New YorkNew YorkNew York 10031USA

Lattice Boltzmann simulations based on the Cahn-Hilliard diffuse interface approach are performed for droplet dynamics in viscous fluid under shear flow,where the degree of confinement between two parallel walls can play an important role.The effects of viscosity ratio,capillary number,Reynolds number,and confinement ratio on Droplet deformation and break-up in moderately and highly confined shear flows are investigated.

关键词： Lattice Boltzmann method Droplet deformation confinement

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Experimental study on the electrohydrodynamic deformation of droplets in a combined DC electric field and shear flow field: 收藏
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引用; Fundamental Research 2023年第2期3卷 274-287页; 作者： Xiangdong Liu Guanqiu Hao Bo Li Yongping Chen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China School of Electrical Energy and Power EngineeringYangzhou UniversityYangzhou 225009China Laser Fusion Research Center China Academy of Engineering PhysicsMianyang 621900China; A visualization experiment was conducted to investigate the electrohydrodynamic deformation of droplets in a combined DC electric field and shear flow field.Detailed experimental data on both the transient and steady ... 详细信息; A visualization experiment was conducted to investigate the electrohydrodynamic deformation of droplets in a combined DC electric field and shear flow field.Detailed experimental data on both the transient and steady Droplet deformation parameters(D)and orientations(ϕ_(d))are provided at R>S and Rdroplet were also examined via the digital particle image velocimetry(DPIV)method.Due to the competition of the extensional component(EC)and the rotational component(RC)of these two fields on the droplet,the response ofϕ_(d) is faster than that of D when an electric field is combined with a shear flow.Additionally,under the competition of the EC and RC at R>S and RDroplet deformation at R>S and Rdroplet in the combined fields,and its velocity is lower under R>S and higher under R; 关键词： Droplet deformation Electrohydrodynamics Electric field Shear flow Prediction model; 来源：维普期刊数据库评论; 学校读者我要写书评

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Numerical simulation of two-phase flow and droplet breakage of glycerin-water mixture and kerosene in the cyclone reactor

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Chinese Journal of Chemical Engineering 2021年第6期34卷 150-159页

作者： Yanni Chi Rui Zhang Xianghai Meng Jian Xu Wei Du Haiyan Liu Zhichang Liu State Key Laboratory of Heavy Oil Processing China University of Petroleum-BeijingBeijing 102249China

A liquid-liquid cyclone reactor(LLCR)was designed to achieve mixing-reaction-separation integration during isobutane alkylation catalyzed by ionic liquids.However,studies of the droplets deformation and breakage in th... 详细信息

A liquid-liquid cyclone reactor(LLCR)was designed to achieve mixing-reaction-separation integration during isobutane alkylation catalyzed by ionic liquids.However,studies of the droplets deformation and breakage in the kind of reactors are lacking.In this work,the research studied the velocity distribution,pressure field,and turbulent field to investigate the flow pattern and the main energy loss location in the LLCR through the computational fluid dynamics(CFD)method.The simulation results were verified by experiemnts to prove the correctness of the model.Then the deformation and breakage process of droplets,and the influencing factors of droplets breakage were studied by remodeling which was based on the tangential velocity distribution result of the three dimensional model.The three dimensional simulation results clearly showed that the pressure of the LLCR was mainly concentrated in the cone section and fluid turbulent motion was the most intense near the lateral wall.The reconstruct the results of the two dimensional model clearly showed that the deformation and breakage location of droplets were mainly occurred in the velocity boundary layer,while it was difficult to break in the mainstream region.In addition,low surface tension and high Weber number had a positive effect on droplet breakage.

关键词： Liquid-liquid cyclone reactor Ionic liquid separation Droplet deformation droplet breakage Computational fluid dynamics

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Simulation of SLD Impingement on Wind Turbine Blade Airfoil

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Transactions of Nanjing University of Aeronautics and Astronautics 2016年第1期33卷 112-120页

作者： Zhu Chengxiang Zhu Chunling Fu Bin ZhaoHuanyu Key Laboratory of Fundamental Science for National Defense Advanced Design Technology of Flight Vehicle Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China Science and Technology on Space Physics Laboratory Beijing 100076P.R.China

Accurate prediction of droplet impingement on wind turbine blade is one of the most important premises of anti-icing and de-icing system design.In a super-cooled large droplets(SLD)conditions,droplet no longer maintai... 详细信息

Accurate prediction of droplet impingement on wind turbine blade is one of the most important premises of anti-icing and de-icing system design.In a super-cooled large droplets(SLD)conditions,droplet no longer maintains a sphere shape,and it may deform,break up,and splash when moving or impinging on the surface.Semi-empirical models of droplet dynamic behaviours are embedded into the Eulerian droplet model to improve the accuracy of the numerical simulation of droplet impingement limits and local collection efficiency.Eulerian droplet model(Model 1)for small droplets and improved Eulerian droplet model(Model 2)for large droplet are both validated by comparing to the wind tunnel experiment results.Using the proposed methods,droplet impingement limitation and local collection efficiency on the S809 airfoil are calculated in various conditions.A detailed derivation of Model 1and Model 2is presented along with a comparison of numerical trajectories,drag coefficient and collection efficiency distributions.The results show that droplet dynamic behaviours,including splashing,break-up and deforming,must be considered to accurately simulate the impingement behaviour in the SLD conditions.And with the increase of the droplet diameters,the effects of the droplet dynamic behaviors on the impingement characteristics are more obvious.

关键词： wind turbine icing super large droplet Droplet deformation splash

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