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bubble dynamics and Heat Transfer on Biphilic Surfaces:Experiments and Numerical Simulation

Journal of Bionic Engineering 2020年第4期17卷 809-821页

作者： Pedro Pontes Ricardo Cautela Emanuele Teodori Ana Sofia Moita Anastasios Georgoulas António Luís Nobre Moreira Moreira IN+-Center for Innovation Technology and Policy ResearchDepartment of Mechanical EngineeringInstituto Superior TécnicoUniversidade de LisboaAv.Rovisco Pais1049-001 LisboaPortugal ASML Holding N.V. De Run 65015504 DRVeldhovenThe Netherlands Department of Exact Sciences and Engineering Portuguese Military AcademyR.Gomes Freire2031169-203 LisboaPortugal Advanced Engineering Centre School of ComputingEngineering and MathematicsCockcroft BuildingLewes RoadUniversity of Brighton BN24GJUK

Wettability is known to play a major role in enhancing pool boiling heat *** this context bioinspired surfaces can bring significant advantages in pool boiling *** work addresses a numerical investigation of bubble growth and detachment on a biphilic surface pattern,namely in a superhydrophobic region surrounded by a hydrophilic *** characteristics resemble bioinspired solutions explored in our research group,mainly considering the main topographical *** numerical approach is intended to provide additional information to an experimental approach,allowing to obtain temperature,pressure and velocity fields in and around the bubble,which help to describe bubble *** model was validated based on experimental data obtained with extensive image processing of synchronized high-speed video and high-speed thermographic *** results obtained here clearly evidence that combining enhanced direct numerical simulations with high-resolution transient experimental measurements is a promising tool to describe the complex and intricate hydrodynamic and heat transfer phenomena governing pool boiling on heated biphilic surfaces.

关键词： bioinspired biphilic surfaces bubble dynamics two-phase heat transfer time resolved infrared thermography CFD model

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bubble dynamics in a two-dimensional gas-solid fluidized bed

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China Particuology 2007年第4期5卷 284-294页

作者： Ruoyu Hong Zhiqiang Ren Jianmin Ding M. Kawaji Hongzhong Li Chemical Engineering Department & Key Laboratory of Organic Synthesis Soochow University Dushuh SIP Suzhou 215123 China Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China IBM HYDA/050-3 C202 3605 Highway 52 North Rochester MN 55901 USA Department of Chemical Engineering and Applied Chemistry University of Toronto Toronto Ont. M5S 3E5 Canada 不详

Related referential studies on gas-solid two-phase flows were briefly reviewed. bubble ascending in a two-dimensional （2D） gas-solid fluidized bed was studied both experimentally and numerically. A modified continuum model expressed in the conservation form was used in numerical simulation. Solid-phase pressure was modeled via local sound speed; gas-phase turbulence was described by the K-ε two-equation model. The modified implicit multiphase formulation （IMF） scheme was used to solve the model equations in 2D Cartesian/cylindrical coordinates. The bubble ascending velocity and particle motion in the 2D fluidized bed were measured using the photochromic dye activation （PDA） technique, which was based on UV light activation of particles impregnated with the dye. Effects of bed height and superficial gas velocity on bubble formation and ascent were investigated numerically. The numerically obtained bubble ascending velocities were compared with experimental measurements. Gas bubble in jetting gas-solids fluidized bed was also simulated numerically.

关键词： Fluidization Numerical simulation Flow visualization bubble dynamics

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Quantitative calculation of reaction performance in sonochemical reactor by bubble dynamics

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Chinese Physics B 2015年第10期24卷 285-291页

作者：徐峥安田启司刘晓峻 School of Physics Science and Engineering Tongji University Department of Chemical Engineering Nagoya University School of Physics Nanjing University

In order to design a sonochemical reactor with high reaction efficiency, it is important to clarify the size and intensity of the sonochemical reaction field. In this study, the reaction field in a sonochemical reactor is estimated from the distribution of pressure above the threshold for cavitation. The quantitation of hydroxide radical in a sonochemical reactor is obtained from the calculation of bubble dynamics and reaction equations. The distribution of the reaction field of the numerical simulation is consistent with that of the sonochemical luminescence. The sound absorption coefficient of liquid in the sonochemical reactor is much larger than that attributed to classical contributions which are heat conduction and shear viscosity. Under the dual irradiation, the reaction field becomes extensive and intensive because the acoustic pressure amplitude is intensified by the interference of two ultrasonic waves.

关键词： reaction field cavitation bubble dynamics hydroxide radical

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Numerical study on the bubble dynamics in a broken confined domain

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Journal of Hydrodynamics 2020年第6期32卷 1029-1042页

作者： Hao Tang Yun-Long Liu Pu Cui A-Man Zhang College of Shipbuilding Engineering Harbin Engineering UniversityHarbin150001China

In this paper,the dynamic characteristics of the bubble in a broken confined domain are *** broken confined domain is composed of a solid wall and a plate that has a *** axisymmetric numerical model is established by combining the Eulerian finite-element method with volume of fluid(VOF)method,and is validated by comparing the results with those from an *** the influences of the wall distance,plate distance and size of the hole are *** results show that cavity-attraction jet caused by the hole and annular jet caused by the upper solid wall compete with each other to dominate the bubble *** cavity-attraction jet develops earlier,but ***,jet load in the bubble stage is mainly generated by the annular jet with a higher impact *** a certain range,the closer the hole is to the bubble or the smaller the hole,the longer the pulsation period of the bubble will be.

关键词： bubble dynamics Eulerian finite element method underwater explosion broken confined domain

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Modeling tail bubble dynamics during the launch of an underwater vehicle using the boundary element method

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Journal of Hydrodynamics 2022年第3期34卷 434-443页

作者： Shao-hua Cheng Xiao-bo Quan Sai Zhang Tian-yuan Zhang Shuai Li College of Shipbuilding Engineering Harbin Engineering UniversityHarbin150001China Beijing Institute of Astronautical Systems Engineering Beijing100076China China Academy of Launch Vehicle Technology Beijing100076China

A tail bubble is generated behind a high-speed vehicle at the early stage of the underwater launch *** tail bubble dynamic behavior involves expansion,overexpansion,contraction,pinch-off and jet formation,and it significantly influences the vehicle’s ***,the tail bubble dynamic behavior is an issue not very well *** paper establishes a numerical model for the interaction between the tail bubble and the vehicle based on the boundary element method(BEM)to gain new insight into this *** BEM results are compared to a computational fluid dynamics model to validate the numerical model,and good agreement is ***,a convergence test of the BEM model is conducted to verify its independence of the mesh *** influence of some governing parameters on the evolution of the tail bubble is then systematically studied,focusing on its maximum radius,pinch-off time,and pinch-off *** are two pinch-off position regimes of the tail bubble,one at the bottom and the other near the middle.

关键词： Underwater launch tail bubble bubble dynamics boundary element method

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Volume of fluid simulation of single argon bubble dynamics in liquid steel under RH vacuum conditions

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Journal of Iron and Steel Research International 2024年第4期31卷 828-837页

作者： Gu-jun Chen Sheng-ping He College of Materials Science and Engineering Yangtze Normal UniversityChongqing 400044China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

Single argon bubble dynamics in liquid steel under Ruhrstahl-Heraeus(RH)vacuum conditions were simulated using the volume of fluid method,and the ideal gas law was used to consider bubble growth due to heat transfer and pressure *** simulation with a constant bubble density was also performed to validate the numerical method,and the predicted terminal bubble shape and velocity were found to agree with those presented in the Grace diagram and calculated by drag correlation,*** simulation results under RH conditions indicate that the terminal bubble shape and velocity cannot be *** primary bubble growth occurs within a rising distance of 0.3 m owing to heating by the high-temperature liquid steel;subsequently,the bubble continues to grow under equilibrium with the hydrostatic *** the initial diameter is 8-32 mm,the bubble diameter and rising velocity near the liquid surface are 80-200 mm and 0.5-0.8 m/s,*** bubble rises rectilinearly with an axisymmetric shape,and the shape evolution history includes an initial sphere,(dimpled)ellipsoid,and spherical cap with satellite bubbles.

关键词： bubble dynamics Liquid steel Volume of fluid bubble growth bubble shape Rising velocity

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Effect of supercritical water shell on cavitation bubble dynamics

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Chinese Physics B 2015年第5期24卷 421-427页

作者：邵纬航陈伟中 The Key Laboratory of Modern Acoustics Nanjing University

Based on reported experimental data, a new model for single cavitation bubble dynamics is proposed considering a supercritical water （SCW） shell surrounding the bubble. Theoretical investigations show that the SCW shell apparently slows down the oscillation of the bubble and cools the gas temperature inside the collapsing bubble. Furthermore, the model is simplified to a Rayleigh-Plesset-like equation for a thin SCW shell. The dependence of the bubble dynamics on the thickness and density of the SCW shell is studied. The results show the bubble dynamics depends on the thickness but is insensitive to the density of the SCW shell. The thicker the SCW shell is, the smaller are the wall velocity and the gas temperature in the bubble. In the authors＇ opinion, the SCW shell works as a buffering agent. In collapsing, it is compressed to absorb a good deal of the work transformed into the bubble internal energy during bubble collapse so that it weakens the bubble oscillations.

关键词： supercritical water shell bubble dynamics

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Experimental and Numerical Study on the bubble dynamics near Two-Connected Walls with An Obtuse Angle

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China Ocean Engineering 2020年第6期34卷 828-839页

作者： LI Shi-min CUI Pu ZHANG Shuai LIU Wen-tao PENG Yu-xiang College of Shipbuilding Engineering Harbin Engineering UniversityHarbin 150001China

This study is concerned with the dynamic characteristics of bubbles near two connected walls(one horizontal and the other inclined with an obtuse angle from the horizontal one). In this study, we set up an experiment system to conduct typical cases, and the boundary element method is employed to explain the bubble behavior and study the effect of relative parameters. Comparing the two mutually perpendicular walls, we find that the liquid jet deviates from the horizontal direction within a much shorter range. On the intersection of the two walls, the motions of bubbles have similar trends. The relatively low pressure between the bubble and walls causes the transition of the bubble, and a local high-pressure zone leads to the formation of a liquid jet. Moreover, there are moments when the two walls are evenly stressed in the first bubble cycle. Through parameter analysis, we find that the jet directions of bubbles perform interesting discrepancies for different buoyancy and distances to walls. Some instructive conclusions are given to serve practical applications.

关键词： bubble dynamics solid walls liquid jets

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Theoretical study on bubble dynamics under hybrid-boundary and multi-bubble conditions using the unified equation

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Science China(Physics,Mechanics & Astronomy) 2023年第12期66卷 142-157页

作者： A-Man Zhang Shi-Min Li Pu Cui Shuai Li Yun-Long Liu College of Shipbuilding Engineering Harbin Engineering UniversityHarbin 150001China Nanhai Institute of Harbin Engineering University Sanya 572024China

This paper aims to use the unified bubble dynamics equation to investigate bubble behavior in complex scenarios involving hybrid free surface/wall boundaries and interactions between multiple *** effect of singularity movement on the unified equation’s form is analyzed after deriving the bubble pulsation equation using a moving point source and a dipole,followed by discussions on the effect of migration compressibility-related terms on the bubble *** addition,the present study accounts for the impact of hybrid boundaries,including crossed and parallel boundaries,by introducing a finite number of mirror bubbles for the former and an infinite number of mirror bubbles for the *** bubble experiments and numerical simulation are conducted to validate the present *** application of the unified equation in multi-bubble interactions is exemplified by computing a spherical bubble array containing more than 100 uniformly distributed cavitation bubbles under different boundary *** bubble cluster-induced pressure peak can reach nearly two times or even higher than that of an individual bubble,highlighting the damage potential caused by cavitation bubble clusters.

关键词： bubble dynamics multiphase flows cavitation

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Investigation of the gas bubble dynamics induced by an electric arc in insulation oil

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Plasma Science and Technology 2022年第4期24卷 21-28页

作者： Chenguang YAN Ya XU Peng ZHANG Shiqi KANG Xian ZHOU Shuyou ZHU State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'an 710049People's Republic of China Beijing Zhongruihe Electrical Co. Ltd.Beijing 101300People's Republic of China

In this work,experimental and theoretical studies were carried out on arc-induced bubble dynamic behaviors in insulation *** experimental evidence indicated that the arc-induced bubble experiences pulsating growth rather than a continuous ***,a theoretical model and numerical calculation method were proposed,which revealed the dynamic mechanism of bubble *** agreement between the theoretical results and experimental observations verified the general correctness and feasibility of the proposed method.

关键词： high-energy arc bubble dynamics insulation oil on-site test

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