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Artykuły w czasopismach na temat „Bubbles”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Zhang, Peng-li, and Shu-yu Lin. "Study on Bubble Cavitation in Liquids for Bubbles Arranged in a Columnar Bubble Group." Applied Sciences 9, no. 24 (2019): 5292. http://dx.doi.org/10.3390/app9245292.

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In liquids, bubbles usually exist in the form of bubble groups. Due to their interaction with other bubbles, the resonance frequency of bubbles decreases. In this paper, the resonance frequency of bubbles in a columnar bubble group is obtained by linear simplification of the bubbles’ dynamic equation. The correction coefficient between the resonance frequency of the bubbles in the columnar bubble group and the Minnaert frequency of a single bubble is given. The results show that the resonance frequency of bubbles in the bubble group is affected by many parameters such as the initial radius of

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2

Zhao, Zhi Xin, Jian Hua Niu, Lan Huang, and Huan Ran Wang. "Simulation of the Motion of Two Bubbles in Aluminum Foams Produced Process by Using Level Set Method." Applied Mechanics and Materials 757 (April 2015): 13–17. http://dx.doi.org/10.4028/www.scientific.net/amm.757.13.

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In this paper, the three-dimensional motion of two bubbles in melt Aluminum was simulated by using level set method. Through changing the positions and sizes of two bubbles, the influence of bubbles wake flow and their interaction are considered. Our numerical simulations demonstrate the bubbles characteristic behavior such as distortion, attraction, and repulsion. The velocity field around the bubbles reveals the interaction between the wakes of two bubbles in fluid dynamics. For the two bubbles placed horizontally or vertically, it is found that the coalescence of bubbles may happen when 50%

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3

Bettaieb, Afef, Nabila Filali, Taoufik Filali, and Habib Ben Aissia. "An efficient algorithm for overlapping bubbles segmentation." Computer Optics 44, no. 3 (2020): 363–74. http://dx.doi.org/10.18287/2412-6179-co-605.

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Image processing is an effective method for characterizing various two-phase gas/liquid flow systems. However, bubbly flows at a high void fraction impose significant challenges such as diverse bubble shapes and sizes, large overlapping bubble clusters occurrence, as well as out-of-focus bubbles. This study describes an efficient multi-level image processing algorithm for highly overlapping bubbles recognition. The proposed approach performs mainly in three steps: overlapping bubbles classification, contour segmentation and arcs grouping for bubble reconstruction. In the first step, we classif

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4

Noguchi, Ryo, Ayako Yano, and Kenji Amagai. "Behaviors of Bubbles Trapped in Film Coating during Spray Gun Coating and Its Influences on Coating Defects." Coatings 13, no. 11 (2023): 1860. http://dx.doi.org/10.3390/coatings13111860.

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In this paper, we investigated the behaviors of bubbles entrained in a film coating during spray coating. Air bubbles that remain in a film coating after diluent evaporation cause coating defects called bubbling defects, including fish-eye and crater defects. In this study, the visualization of a film coating revealed that smaller bubbles in the film shrank slowly and disappeared, while larger bubbles remained. These remaining bubbles grew during the heating process for the drying of the film coating. The shrinking phenomenon was explained using bubble dynamics based on the Young–Laplace equat

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5

Cai, Runze, Jiao Sun, and Wenyi Chen. "Experimental Investigation on the Dynamic Characteristics of Bubble-in-Chain Near a Vertical Wall." Applied Sciences 14, no. 14 (2024): 6076. http://dx.doi.org/10.3390/app14146076.

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The motion of near-wall bubble-in-chain, which is a crucial aspect of the study of near-wall bubble flows, involves not only the wall effect but also the interactions between bubbles. However, there have been few studies on this topic. In this study, we investigated the motion of near-wall bubble-in-chain using a dual-camera orthogonal shadow method and tracked bubbles using image processing and feature matching techniques. Considering both the wall effect and bubble generation frequency, we discussed the statistical characteristics, motion modes, dynamic characteristics, and energy evolution

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6

Meernik, P. R., and M. C. Yuen. "An Optical Method for Determining Bubble Size Distributions—Part I:Theory." Journal of Fluids Engineering 110, no. 3 (1988): 325–31. http://dx.doi.org/10.1115/1.3243551.

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A new optical technique is developed to determine the size distribution of bubbles in a two-phase flow. Implementation involves passing a narrow beam of light through the bubbly flow and monitoring the transmitted light intensity. The basic units of data are the rate at which each bubble blocks off the beam and the duration of blockage. Adding the hypothesis that the distance of closest approach between a bubble’s center and the beam axis is randomly distributed, a statistical analysis yields the bubble size distribution.

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7

Han, Rui, Jiayi Chen, and Taikun Guo. "A Modified Phase-Transition Model for Multi-Oscillations of Spark-Generated Bubbles." Inventions 8, no. 5 (2023): 131. http://dx.doi.org/10.3390/inventions8050131.

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The main composition within a spark-generated bubble primarily consists of vapor, accompanied by a minor presence of noncondensable gases. The phase transition exerts a substantial influence on bubble dynamics throughout various stages, a facet that has been frequently overlooked in prior research. In this study, we introduce a modified theoretical model aimed at accurately predicting the multiple oscillations of spark-generated bubbles. Leveraging the Plesset equation, which integrates second-order corrections for compressibility and non-equilibrium evaporation, we further incorporate the the

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8

Zhou, Ge. "THE SPIRIT OF CAPITALISM AND RATIONAL BUBBLES." Macroeconomic Dynamics 20, no. 6 (2015): 1432–57. http://dx.doi.org/10.1017/s1365100514000972.

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This study provides an infinite-horizon model of rational bubbles in a production economy. A bubble can arise when the pursuit of status is modeled explicitly, capturing the notion of “the spirit of capitalism.” Using a parameterized model, I demonstrate the specific conditions for the existence of bubbles and their implications. Bubbles crowd out investment, stimulate consumption, and slow economic growth. I also discuss a stochastic bubble that bursts with an exogenous probability. I show that there could be multiple stochastic bubbly equilibria. Moreover, I suggest that taxing wealth proper

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9

Prakash, Vivek N., J. Martínez Mercado, Leen van Wijngaarden, et al. "Energy spectra in turbulent bubbly flows." Journal of Fluid Mechanics 791 (February 15, 2016): 174–90. http://dx.doi.org/10.1017/jfm.2016.49.

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We conduct experiments in a turbulent bubbly flow to study the nature of the transition between the classical $-5/3$ energy spectrum scaling for a single-phase turbulent flow and the $-3$ scaling for a swarm of bubbles rising in a quiescent liquid and of bubble-dominated turbulence. The bubblance parameter (Lance & Bataille J. Fluid Mech., vol. 222, 1991, pp. 95–118; Rensen et al., J. Fluid Mech., vol. 538, 2005, pp. 153–187), which measures the ratio of the bubble-induced kinetic energy to the kinetic energy induced by the turbulent liquid fluctuations before bubble injection, is often us

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10

Loisy, Aurore, Aurore Naso, and Peter D. M. Spelt. "Buoyancy-driven bubbly flows: ordered and free rise at small and intermediate volume fraction." Journal of Fluid Mechanics 816 (March 3, 2017): 94–141. http://dx.doi.org/10.1017/jfm.2017.64.

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Various expressions have been proposed previously for the rise velocity of gas bubbles in homogeneous steady bubbly flows, generally a monotonically decreasing function of the bubble volume fraction. For suspensions of freely moving bubbles, some of these are of the form expected for ordered arrays of bubbles, and vice versa, as they do not reduce to the behaviour expected theoretically in the dilute limit. The microstructure of weakly inhomogeneous bubbly flows not being known generally, the effect of microstructure is an important consideration. We revisit this problem here for bubbly flows

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11

Cheng, Yuezhu, Jie Shi, Yuan Cao, and Haoyang Zhang. "Predictions of the Effect of Non-Homogeneous Ocean Bubbles on Sound Propagation." Journal of Marine Science and Engineering 12, no. 9 (2024): 1510. http://dx.doi.org/10.3390/jmse12091510.

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In the ocean, bubbles rarely appear alone and are often not evenly distributed, which makes it complicated to predict the effect of ocean bubbles on sound propagation. To solve this problem, researchers have tried to use approximations such as equivalent and multiple scattering models, but these approximations are accompanied by large errors. Therefore, we propose a semi-numerical and semi-analytical calculation method for underwater sound fields containing non-homogeneous bubbles in this paper. Based on the attenuation cross section and scattering cross section of a single bubble, the non-hom

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12

Lu, Jiacai, and Gretar Tryggvason. "Dynamics of nearly spherical bubbles in a turbulent channel upflow." Journal of Fluid Mechanics 732 (August 30, 2013): 166–89. http://dx.doi.org/10.1017/jfm.2013.397.

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AbstractThe dynamics of bubbles in upflow, in a vertical channel, is examined using direct numerical simulations (DNS), where both the flow and the bubbles are fully resolved. Two cases are simulated. In one case all the bubbles are of the same size and sufficiently small so they remain nearly spherical. In the second case, some of the small bubbles are coalesced into one large bubble. In both cases lift forces drive small bubbles to the wall, removing bubbles from the channel interior until the two-phase mixture is in hydrostatic equilibrium, and forming a bubble-rich wall layer. The same evo

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13

Battistella, Alessandro, Sander Aelen, Ivo Roghair, and Martin van Sint Annaland. "Euler–Lagrange Modeling of Bubbles Formation in Supersaturated Water." ChemEngineering 2, no. 3 (2018): 39. http://dx.doi.org/10.3390/chemengineering2030039.

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Phase transition, and more specifically bubble formation, plays an important role in many industrial applications, where bubbles are formed as a consequence of reaction such as in electrolytic processes or fermentation. Predictive tools, such as numerical models, are thus required to study, design or optimize these processes. This paper aims at providing a meso-scale modelling description of gas–liquid bubbly flows including heterogeneous bubble nucleation using a Discrete Bubble Model (DBM), which tracks each bubble individually and which has been extended to include phase transition. The mod

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14

Jamali, Bentolhoda, Sohrab Behnia, and Samira Fathizadeh. "Bubble dynamics: The role of acoustic pressure and temperature on stability and multifractality." Journal of the Acoustical Society of America 157, no. 4 (2025): 3133–47. https://doi.org/10.1121/10.0036458.

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Environmental temperature significantly affects bubble dynamics. The temperature directly influences the liquid's surface tension, viscosity, and the bubble's spherical shape. These properties, in turn, affect the bubble expansion rate and collapse intensity. Thus, temperature plays a crucial role in the formation, growth, and collapse of bubbles. This study investigates the radial oscillation stabilities of microbubbles, considering the environmental temperature, functional acoustic pressure generator, bubble oscillation frequency, and initial radius. Using methods from dynamical systems theo

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15

Martin, Alberto, and Jaume Ventura. "Economic Growth with Bubbles." American Economic Review 102, no. 6 (2012): 3033–58. http://dx.doi.org/10.1257/aer.102.6.3033.

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We develop a stylized model of economic growth with bubbles in which changes in investor sentiment lead to the appearance and collapse of macroeconomic bubbles or pyramid schemes. These bubbles mitigate the effects of financial frictions. During bubbly episodes, unproductive investors demand bubbles while productive investors supply them. These transfers of resources improve economic efficiency thereby expanding consumption, the capital stock and output. When bubbly episodes end, there is a fall in consumption, the capital stock and output. We argue that the stochastic equilibria of the model

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16

Wang, HanBin, Yang Xu, and Jinjun Wang. "Experimental Study On Bubble Pairs And Induced Flow Fields Using Tomographic Particle Image Velocimetry." Proceedings of the International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 21 (July 8, 2024): 1–10. http://dx.doi.org/10.55037/lxlaser.21st.147.

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Gas-liquid two-phase flows, such as bubbly flows, are widely used across various engineering and military applications due to their distinctive fluid dynamics. This study utilizes advanced imaging techniques, including shadowgraphy and laser-induced fluorescence tomographic particle image velocimetry (LIF-TPIV), to provide a quantitative analysis of bubble motions and the resulting flow fields. We systematically investigate the effects of orifice distances (s) set at 10, 15, 20, and 25 mm to assess the impact of spacing on bubble behavior and interactions. Our findings indicate that at orifice

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17

Chen, Yong, Tao Wu, and Jian-Ping Lin. "Numerical Study on the Influence of Bubble Defection on the Bond Strength of Externally Bonded Fiber-Reinforced Polymer-to-Concrete Joints." Buildings 13, no. 10 (2023): 2479. http://dx.doi.org/10.3390/buildings13102479.

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The influences of bubble defects on the bond strengths of externally bonded fiber-reinforced polymer (EB-FRP) concrete joints were investigated using numerical method in this research. Studies of the influences of increasing bubble defect areas on interfacial bonding performance were first conducted. It was observed that the influence of a bubble deficiency located in the middle of the bond region is not significant when the size of the bubble area is less than 2.5% of the effective bond area. Then, further investigation was conducted on the influences of the distances between the bubble and t

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18

Wang, Yi-Chun. "Effects of Nuclei Size Distribution on the Dynamics of a Spherical Cloud of Cavitation Bubbles." Journal of Fluids Engineering 121, no. 4 (1999): 881–86. http://dx.doi.org/10.1115/1.2823550.

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The nonlinear dynamics of a spherical bubble cloud with nuclei size distribution are studied numerically. The spectrum of nuclei is assumed uniform initially. The simulations employ a nonlinear continuum bubbly mixture model with consideration of the presence of bubbles of different sizes. This model is then coupled with the Rayleigh-Plesset equation for the dynamics of bubbles. A numerical method based on the integral representation of the mixture continuity and momentum equations in the Lagrangian coordinates is developed to solve this set of integro-differential equations. Computational res

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19

Van Liew, Hugh D., and Soumya Raychaudhuri. "Stabilized bubbles in the body: pressure-radius relationships and the limits to stabilization." Journal of Applied Physiology 82, no. 6 (1997): 2045–53. http://dx.doi.org/10.1152/jappl.1997.82.6.2045.

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Van Liew, Hugh D., and Soumya Raychaudhuri. Stabilized bubbles in the body: pressure-radius relationships and the limits to stabilization. J. Appl. Physiol.82(6): 2045–2053, 1997.—We previously outlined the fundamental principles that govern behavior of stabilized bubbles, such as the microbubbles being put forward as ultrasound contrast agents. Our present goals are to develop the idea that there are limits to the stabilization and to provide a conceptual framework for comparison of bubbles stabilized by different mechanisms. Gases diffuse in or out of stabilized bubbles in a limited and reve

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20

Reeder, D. Benjamin, John E. Joseph, Thomas A. Rago, Jeremy M. Bullard, David Honegger, and Merrick C. Haller. "Acoustic spectrometry of bubbles in an estuarine front: Sound speed dispersion, void fraction, and bubble density." Journal of the Acoustical Society of America 151, no. 4 (2022): 2429–43. http://dx.doi.org/10.1121/10.0009923.

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Estuaries constitute a unique waveguide for acoustic propagation. The spatiotemporally varying three-dimensional front between the seawater and the outflowing freshwater during both flood and ebb constitutes an interfacial sound speed gradient capable of supporting significant vertical and horizontal acoustic refraction. The collision of these two water masses often produces breaking waves, injecting air bubbles into the water column; the negative vertical velocities of the denser saltwater often subduct bubbles to the bottom of these shallow waveguides, filling the water column with a bubbly

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21

Su, Chi-Wei, Lu Liu, and Kai-Hua Wang. "Do Bubble Behaviors Exist in Chinese Film Stocks?" SAGE Open 10, no. 4 (2020): 215824402098330. http://dx.doi.org/10.1177/2158244020983300.

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This article investigates bubbles in the Chinese film industry to reveal the industry’s boom and bust process that influences employment, citizen’s livelihoods, and even economic growth. We adopt the film stock index to reflect the industry’s trajectory and employ the generalized and backward sup augmented Dickey–Fuller tests to detect bubble periods. Empirical results indicate that there are three positive bubbles in 2007, 2013, and 2015, indicating that the film market continues to expand after temporary frustrations. Meanwhile, one negative bubble is found in 2019, which demonstrates that t

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22

Zhao, Mengke, Jianjun Zhou, Willem A. Baan, et al. "Magnetic Field of Molecular Gas Measured with the Velocity Gradient Technique. II. Curved Magnetic Field in kpc-scale Bubble of NGC 628." Astrophysical Journal 967, no. 1 (2024): 18. http://dx.doi.org/10.3847/1538-4357/ad3a62.

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Abstract We report the detection of the ordered alignment between the magnetic field and kpc-scale bubbles in the nearby spiral galaxy, NGC 628. Applying the Velocity Gradient Technique on CO spectroscopic data from the ALMA-PHANGS, the magnetic field of NGC 628 is measured at the scale of 191 pc (∼4″). The large-scale magnetic field is oriented parallel to the spiral arms and curves around the galactic bubble structures in the mid-infrared emission observed by the James Webb Space Telescope. A total of 21 bubble structures have been identified at the edges of spiral arms with scales over 300

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23

Mundhra, Raghav, Rajaram Lakkaraju, Prasanta Kumar Das, Maksim A. Pakhomov, and Pavel D. Lobanov. "Effect of Wall Proximity and Surface Tension on a Single Bubble Rising near a Vertical Wall." Water 15, no. 8 (2023): 1567. http://dx.doi.org/10.3390/w15081567.

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Path instability of a rising bubble is a complex phenomenon. In many industrial applications, bubbles encounter walls, and the interactions between the bubbles and the wall have a significant impact on flow physics. A single bubble rising near a vertical wall was experimentally observed to follow a bouncing trajectory. To investigate the near-wall dynamics of rising bubbles, 3D numerical simulations were performed based on the volume of fluid (VOF) method using the open source solver OpenFOAM. The effect of wall proximity and surface tension on the bubble trajectory was investigated. Previous

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24

DELALE, C. F., G. H. SCHNERR, and J. SAUER. "Quasi-one-dimensional steady-state cavitating nozzle flows." Journal of Fluid Mechanics 427 (January 25, 2001): 167–204. http://dx.doi.org/10.1017/s0022112000002330.

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Quasi-one-dimensional cavitating nozzle flows are considered by employing a homogeneous bubbly liquid flow model. The nonlinear dynamics of cavitating bubbles is described by a modified Rayleigh–Plesset equation that takes into account bubble/bubble interactions by a local homogeneous mean-field theory and the various damping mechanisms by a damping coefficient, lumping them together in the form of viscous dissipation. The resulting system of quasi-one-dimensional cavitating nozzle flow equations is then uncoupled leading to a nonlinear third-order ordinary differential equation for the flow s

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25

Ren, Zhong-Fu, Fang-Zhi Kong, Fei-Yan Wang, and Gui-Fang Hu. "Effect of bubble size on nanofiber diameter in bubble electrospinning." Thermal Science 20, no. 3 (2016): 845–48. http://dx.doi.org/10.2298/tsci1603845r.

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Polymer bubbles are widely used for fabrication of nanofibers. Bubble size affects not only bubble's surface tension, but also fiber's morphology. A mathematical model is established to reveal the effect of bubble size on the spinning process, and the experiment verification shows the theoretical analysis is reliable.

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26

Bogatko, Tatiana V., Aleksandr V. Chinak, Ilia A. Evdokimenko, Dmitriy V. Kulikov, Pavel D. Lobanov, and Maksim A. Pakhomov. "The Effect of a Backward-Facing Step on Flow and Heat Transfer in a Polydispersed Upward Bubbly Duct Flow." Water 13, no. 17 (2021): 2318. http://dx.doi.org/10.3390/w13172318.

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The experimental and numerical results on the flow structure and heat transfer in a bubbly polydispersed upward duct flow in a backward-facing step are presented. Measurements of the carrier fluid phase velocity and gas bubbles motion are carried out using the PIV/PLIF system. The set of RANS equations is used for modeling the two-phase bubbly flow. Turbulence of the carrier fluid phase is predicted using the Reynolds stress model. The effect of bubble addition on the mean and turbulent flow structure is taken into account. The motion and heat transfer in a dispersed phase is modeled using the

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27

Wang, Chuanxi, Yashar Mehmani, and Ke Xu. "Capillary equilibrium of bubbles in porous media." Proceedings of the National Academy of Sciences 118, no. 17 (2021): e2024069118. http://dx.doi.org/10.1073/pnas.2024069118.

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In geologic, biologic, and engineering porous media, bubbles (or droplets, ganglia) emerge in the aftermath of flow, phase change, or chemical reactions, where capillary equilibrium of bubbles significantly impacts the hydraulic, transport, and reactive processes. There has previously been great progress in general understanding of capillarity in porous media, but specific investigation into bubbles is lacking. Here, we propose a conceptual model of a bubble’s capillary equilibrium associated with free energy inside a porous medium. We quantify the multistability and hysteretic behaviors of a

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28

Yoon, Dongik, Hyun Jin Park, Yuji Tasaka, and Yuichi Murai. "Lift coefficient of bubble sliding inside turbulent boundary layers in an inclinable channel flow." Physics of Fluids 34, no. 5 (2022): 053301. http://dx.doi.org/10.1063/5.0086777.

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The behavior of bubbles traveling in the proximity of a tilted wall is studied experimentally to understand the fundamental sliding motion of bubbles inside turbulent boundary layers along an inclined wall. The qualitative visualization of sliding bubbles confirms the contribution of bubble buoyancy on the sliding motion for negative and positive inclinations of the channel. An opto-acoustic combined measurement technique is adopted to explore the sliding motion. Liquid velocity profiles in the bubbly flow and the distance between the wall and bottom of the bubble are obtained using the ultras

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29

Nguyen, Van Luc, Tomohiro Degawa, and Tomomi Uchiyama. "Numerical simulation of the interaction between a vortex ring and a bubble plume." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 9 (2019): 3192–224. http://dx.doi.org/10.1108/hff-12-2018-0734.

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Purpose This paper aims to provide discussions of a numerical method for bubbly flows and the interaction between a vortex ring and a bubble plume. Design/methodology/approach Small bubbles are released into quiescent water from a cylinder tip. They rise under the buoyant force, forming a plume. A vortex ring is launched vertically upward into the bubble plume. The interactions between the vortex ring and the bubble plume are numerically simulated using a semi-Lagrangian–Lagrangian approach composed of a vortex-in-cell method for the fluid phase and a Lagrangian description of the gas phase. F

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Yang, Zhi Yong, Jian Dong Li, and Guo Hua Zhang. "Numerical Simulation of Bubble Coalescence Based on VOF Method." Applied Mechanics and Materials 148-149 (December 2011): 814–17. http://dx.doi.org/10.4028/www.scientific.net/amm.148-149.814.

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This paper takes bubbles of bubble shell as research object, mainly studies two bubbles arranged in a vertical position. Applying VOF (volume of fluid) method to simulate interaction between two bubbles, analyses the effect of center distances and diameters on deformation and coalescence of bubbles. Results show that coalescence time of two bubbles with same diameters increases as the center distance increases. To two bubbles with different diameters, when the bigger bubble located beneath at the initial time, the smaller bubble moves upward first and then moves downward before two bubbles coa

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Bulatova, A. Z., O. A. Solnyshkina, and N. B. Fatkullina. "Numerical study of single bubble mobility in triangular and deltoid microchannels using the boundary element method." Journal of Physics: Conference Series 2057, no. 1 (2021): 012042. http://dx.doi.org/10.1088/1742-6596/2057/1/012042.

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Abstract The study of bubbly liquid dynamics in microchannels of unconventional shapes is of great importance for different fields of science and industry. This work investigates the dynamics of the incompressible single bubbles in the slow periodic flow of viscous liquid in a triangular channel with a variable pressure gradient. The numerical approach used in this research is based on the boundary element method (BEM). This method is widely used for solving three-dimensional problems and problems in areas with complex geometry. The influence of the bubble’s initial position relative to the ch

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32

Truby, J. M., S. P. Mueller, E. W. Llewellin, and H. M. Mader. "The rheology of three-phase suspensions at low bubble capillary number." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 471, no. 2173 (2015): 20140557. http://dx.doi.org/10.1098/rspa.2014.0557.

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We develop a model for the rheology of a three-phase suspension of bubbles and particles in a Newtonian liquid undergoing steady flow. We adopt an ‘effective-medium’ approach in which the bubbly liquid is treated as a continuous medium which suspends the particles. The resulting three-phase model combines separate two-phase models for bubble suspension rheology and particle suspension rheology, which are taken from the literature. The model is validated against new experimental data for three-phase suspensions of bubbles and spherical particles, collected in the low bubble capillary number reg

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Jia, Zheng, Mingjun Pang, and Ruipeng Niu. "Numerical Investigation on Effect of Bubbles Arrangement and Volume Fraction on Apparent Viscosity of Bubbly Suspensions." Recent Innovations in Chemical Engineering (Formerly Recent Patents on Chemical Engineering) 16, no. 4 (2023): 285–304. http://dx.doi.org/10.2174/0124055204268474230922054143.

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Background:: Bubbly suspensions can be often run into in natural and industrial processes. The addition of bubbles with different sizes can lead to a significant change in the rheological properties of a matrix liquid. It is extremely significant to fully understand the rheological properties of bubbly suspensions for improving process efficiencies and optimizing productive processes. background: Bubbly suspensions can be often run into in natural and industrial processes. The addition of bubbles of different sizes can greatly change the rheological properties of matrix liquid. It is extremely

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Lu, Tianshi, Roman Samulyak, and James Glimm. "Direct Numerical Simulation of Bubbly Flows and Application to Cavitation Mitigation." Journal of Fluids Engineering 129, no. 5 (2006): 595–604. http://dx.doi.org/10.1115/1.2720477.

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The direct numerical simulation (DNS) method has been used to the study of the linear and shock wave propagation in bubbly fluids and the estimation of the efficiency of the cavitation mitigation in the container of the Spallation Neutron Source liquid mercury target. The DNS method for bubbly flows is based on the front tracking technique developed for free surface flows. Our front tracking hydrodynamic simulation code FronTier is capable of tracking and resolving topological changes of a large number of interfaces in two- and three-dimensional spaces. Both the bubbles and the fluid are compr

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Lelouvetel, J., T. Tanaka, Y. Sato, and K. Hishida. "Transport mechanisms of the turbulent energy cascade in upward/downward bubbly flows." Journal of Fluid Mechanics 741 (February 13, 2014): 514–42. http://dx.doi.org/10.1017/jfm.2014.24.

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AbstractThe turbulent energy cascade in an upward or downward bubbly pipe flow with a Reynolds number of 1.5 × 104 was experimentally investigated in order to examine the effects of the flow direction on the turbulence modifications by bubbles. The bubble diameter was approximately 1 mm. The combination of a particle tracking velocimetry (PTV) system with Kolmogorov-order spatial and temporal resolutions and a shape projection imaging (SPI) system was used to simultaneously capture the liquid and bubble motions. The physical mechanisms of turbulence modification at each length scale, or in wav

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Sun, T. Y., R. N. Parthasarathy, and G. M. Faeth. "Structure of Bubbly Round Condensing Jets." Journal of Heat Transfer 108, no. 4 (1986): 951–59. http://dx.doi.org/10.1115/1.3247040.

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A theoretical and experimental study of turbulent bubbly condensing jets is reported. Tests involved initially monodisperse carbon dioxide bubbles in water (∼ 1 mm diameter bubbles with initial gas volume fractions of 2.4 and 4.8 percent) injected vertically upward in still water. Measurements were made of mean and fluctuating phase velocities, mean bubble diameters, mean bubble number intensities, and mean concentrations of dissolved carbon dioxide. Three theoretical methods were used to interpret the measurements: (1) locally homogeneous flow analysis, assuming infinitely fast interphase tra

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Ban, Zhen Hong, Kok Keong Lau, and Mohd Sharif Azmi. "Bubble Nucleation and Growth of Dissolved Gas in Solution Flowing across a Cavitating Nozzle." Applied Mechanics and Materials 773-774 (July 2015): 304–8. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.304.

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Computational modelling of dissolved gas bubble formation and growth in supersaturated solution is essential for various engineering applications, including flash vaporisation of petroleum crude oil. The common mathematical modelling of bubbly flow only caters for single liquid and its vapour, which is known as cavitation. This work aims to simulate the bubble nucleation and growth of dissolved CO2 in water across a cavitating nozzle. The dynamics of bubble nucleation and growth phenomenon will be predicted based on the hydrodynamics in the computational domain. The complex interrelated bubble

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THO, PAUL, RICHARD MANASSEH, and ANDREW OOI. "Cavitation microstreaming patterns in single and multiple bubble systems." Journal of Fluid Mechanics 576 (March 28, 2007): 191–233. http://dx.doi.org/10.1017/s0022112006004393.

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Cavitation microstreaming is a well-known phenomenon; however, few flow visualizations or measurements of the velocity fields have been conducted. In this paper micro-PIV (particle image velocimetry) measurements and streak photography were used to study the flow field around a single and two oscillating bubbles resting on a solid boundary. The mode of oscillation of the bubble was also measured in terms of the variation in the radius of the bubble and the movement of the bubble's centroid so that the streaming flow field could be accurately related to the bubble's oscillatory motion. The mode

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Liu 刘, Teng 腾., Andrea Merloni, Jeremy Sanders, et al. "Morphological Evidence for the eROSITA Bubbles Being Giant and Distant Structures." Astrophysical Journal Letters 967, no. 2 (2024): L27. http://dx.doi.org/10.3847/2041-8213/ad47e0.

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Abstract There are two contradictory views of the eROSITA bubbles: either a 104 pc scale pair of giant bubbles blown by the Galactic center (GC), or a 102 pc scale local structure coincidentally located in the direction of GC. A key element of this controversy is the distance to the bubbles. Based on the 3D dust distribution in the Galactic plane, we found three isolated, distant (500–800 pc) clouds at intermediate Galactic latitudes. Their projected morphologies perfectly match the X-ray shadows on the defining features of the north eROSITA bubble, i.e., the North Polar Spur (NPS) and the Lot

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Ochiai, N., and J. Ishimoto. "Numerical investigation of multiple-bubble behaviour and induced pressure in a megasonic field." Journal of Fluid Mechanics 818 (April 6, 2017): 562–94. http://dx.doi.org/10.1017/jfm.2017.154.

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Clarifying the mechanism of particle removal by megasonic cleaning and multiple-bubble dynamics in megasonic fields is essential for removing contaminant particles during nanodevice cleaning without pattern damage. In particular, the effect of the interaction of multiple bubbles on bubble-collapse behaviour and impulsive pressure induced by bubble collapse should also be discussed. In this study, a compressible locally homogeneous model of a gas–liquid two-phase medium is used to numerically analyse the multiple-bubble behaviour in a megasonic field. The numerical results indicate that, for bu

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CHEW, LUP WAI, BOO CHEONG KHOO, EVERT KLASEBOER, and SIEW-WAN OHL. "INTERACTION OF TWO DIFFERENTLY SIZED BUBBLES IN A FREE FIELD." International Journal of Modern Physics: Conference Series 19 (January 2012): 180–84. http://dx.doi.org/10.1142/s2010194512008720.

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The interaction between two different sized (spark created, non-equilibrium) bubbles is studied by using high speed photography. The bubble size ranges from 2 to 7 mm. The experimental results are compared to that of the similar sized bubbles reported in the literature. Interestingly, all the four major behaviors of bubble-bubble interactions (i.e. 'bubble-collapsed' induced liquid jets directed away from each other, liquid jets directed towards each other, bubble coalescence and the 'catapult' effect) are observed which bear much similarity to that found for similar sized bubbles' interaction

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Chen, Junliang, Mao Lei, Shaobo Lu, Xiaolong Xiao, Mingxiu Yao, and Qiang Li. "Numerical simulation of single bubble motion fragmentation mechanism in Venturi-type bubble generator." Mechanics & Industry 25 (2024): 21. http://dx.doi.org/10.1051/meca/2024016.

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Microbubbles have been widely used in power, chemical, mining and petroleum applications to improve energy efficiency. The venture-type bubble generator can improve reaction efficiency in chemical engineering as an efficient bubble generation method. Studying the flow field and bubble bursting mechanism can enhance the bubble generation performance. The volume of fluid (VOF) multiphase flow model was used in the Open Field Operation and Manipulation (OpenFOAM) framework to study the deformation and fragmentation behaviour of a single bubble in a Quasi three-dimensional. The relationship betwee

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Guo, Wenqi, Fulin Yu, Chao Su, Zhanquan Li, Fengguang Jia, and Yueying Gong. "Experimental Study on Multi Bubble Ice Breaking Under Layer Ice Boundary Conditions." Advances in Computer and Engineering Technology Research 1, no. 1 (2023): 210. http://dx.doi.org/10.61935/acetr.1.1.2023.p210.

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Under certain conditions of bubble spacing and bubble to ice distance, the motion state and ice breaking effect of horizontal and vertical bubbles under ice plate boundary conditions were studied. Bubbles are generated through underwater discharge, and the generating device is placed horizontally or vertically below the ice plate, and the experimental phenomenon is observed through an ultra-high-speed camera. Firstly, the motion characteristics and ice breaking ability of two horizontal bubbles under an unperforated ice block were demonstrated. Then, the motion characteristics of two horizonta

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van Lookeren Campagne, C., R. Nicodemus, G. J. de Bruin, and D. Lohse. "A Method for Pressure Calculation in Ball Valves Containing Bubbles." Journal of Fluids Engineering 124, no. 3 (2002): 765–71. http://dx.doi.org/10.1115/1.1486220.

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A method of analyzing bubbly flow in a ball valve in a hydraulic circuit is presented. The dynamics of a single bubble can be well described by a quasi-static approximation of the Rayleigh-Plesset equation. Hence the presence of bubbles in low volume fractions can be modeled through an effective compressibility of the flow, which is easy to implement in commercial CFD packages. In the sample valve, a volume fraction of 4% air bubbles results in a mass flux reduction of up to 10%, as the bubbles expand due to the pressure drop in the valve and partly block it.

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Yang, Weidong, Zhiguo Luo, Nannan Zhao, and Zongshu Zou. "Numerical Analysis of Effect of Initial Bubble Size on Captured Bubble Distribution in Steel Continuous Casting Using Euler-Lagrange Approach Considering Bubble Coalescence and Breakup." Metals 10, no. 9 (2020): 1160. http://dx.doi.org/10.3390/met10091160.

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A mathematic model considering the bubble coalescence and breakup using the Euler-Lagrange approach has been developed to study the effect of the initial bubble size on the distribution of bubbles captured by the solidification shell. A hard sphere model was applied for dealing with the bubble collision. Advanced bubble coalescence and breakup models suitable for the continuous casting system and an advanced bubble captured criteria have been identified established with the help of user-defined functions of FLUENT. The predictions of bubble behavior and captured bubble distribution agree with

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Roshid, Mohammed M., and Richard Manasseh. "Passive acoustic measurement of bubble size and number from a bubble chain." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A110. http://dx.doi.org/10.1121/10.0022953.

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Experiments and matching simulations are presented on the passive-acoustic emissions of a chain of bubbles, with the aim of deducing both the bubble size and number of bubbles from the emitted sound. It is well known that bubble-acoustic interactions cause shifts in frequency from those predicted for single bubbles, complicating the goal of measuring bubble size by measuring frequency, and also affecting the collective resonances of bubbles driven by ultrasound. A horizontal line of identical bubbles was held fixed in space, eliminating uncertainties in earlier studies due to the variable shap

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Jiang, Mingzuo, Kun Liu, Jiaxia Wang, Xiaojie Zhao, and Shizeng Wu. "Exploration of the Pulsation Characteristics of a Bubble Adjacent to the Structure with Multiple Air Bubble Adhesions." Journal of Marine Science and Engineering 12, no. 9 (2024): 1631. http://dx.doi.org/10.3390/jmse12091631.

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The dynamics of bubbles have garnered extensive interest among researchers both domestically and internationally due to their applications in engineering and military fields. The exploration of the mechanisms behind bubble loading, cavitation damage, and impact destruction has always been a focal point of study. However, in practical applications, bubbles often do not occur in isolation, and the interactions between multiple bubbles are highly complex. Therefore, this study investigates the pulsation characteristics of bubbles near rigid boundaries with multiple air bubbles attached in differe

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d’Agostino, Luca, and Fabio Burzagli. "On the Stability of Parallel Bubbly Cavitating Flows." Journal of Fluids Engineering 122, no. 3 (2000): 471–80. http://dx.doi.org/10.1115/1.1287036.

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This paper illustrates the effects of the dynamics of bubbles with arbitrary vapor-gas contents on the inviscid and viscous stability of two-dimensional parallel bubbly flows of low void fraction. The linear perturbation equations derived for the stability analysis include the effects of bubble compressibility, inertia, and energy dissipation due to the viscosity of the liquid and the transfer of heat and mass as a consequence of compression/expansion of the noncondensable gas and evaporation/condensation of the vapor contained in the bubbles. Numerical solution of the spatial stability proble

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Wu, Yaorong, Weizhong Chen, Lingling Zhang, Yang Shen, Guoying Zhao, and Shaoyang Kou. "The left-right symmetrical and asymmetrical deformations in a three-bubble system." Journal of the Acoustical Society of America 152, no. 4 (2022): 2446–55. http://dx.doi.org/10.1121/10.0014905.

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This paper studies the simplest system that can possess left-right symmetrical and asymmetrical surroundings, three bubbles in a line. Assuming that the deformations are small, the surfaces of bubbles are described by a combination of the first three Legendre polynomials, that is, spherical symmetrical mode P0, L-R antisymmetrical mode P1, and symmetrical mode P2. A dynamical model is built to describe aspherical oscillations of central and two side bubbles. It is found that when three identical bubbles are separated uniformly, the central bubble only has a P2 component and P1 component tends

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Özcan, İsmail, Sırma Zeynep Alparslan Gök, and Gerhard-wilhelm Weber. "On the core of cooperative grey games under bubbly uncertainty." Journal of Turkish Operations Management 8, no. 2 (2024): 530–36. https://doi.org/10.56554/jtom.1285698.

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This paper introduces a novel category of cooperative games called cooperative bubbly grey games, in which the value of each coalition is represented by a grey bubble rather than a numerical value. To be exact, rather of using actual numbers, the coalition values are rep- resented as bubbles. Accordingly, we use the cooperative grey game model to overcome the bubbly uncertainty. Both the idea of the bub- bly core and the cooperative bubbly game concept are introduced. Grey data may be used as a tool in cooperative grey games to address pro t or cost-sharing challenges. When considering coopera

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