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Journal articles on the topic 'Bubble growth'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

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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2

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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3

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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4

CHOI, JAEHYUG, CHAO-TSUNG HSIAO, GEORGES CHAHINE, and STEVEN CECCIO. "Growth, oscillation and collapse of vortex cavitation bubbles." Journal of Fluid Mechanics 624 (April 10, 2009): 255–79. http://dx.doi.org/10.1017/s0022112008005430.

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The growth, oscillation and collapse of vortex cavitation bubbles are examined using both two- and three-dimensional numerical models. As the bubble changes volume within the core of the vortex, the vorticity distribution of the surrounding flow is modified, which then changes the pressures at the bubble interface. This interaction can be complex. In the case of cylindrical cavitation bubbles, the bubble radius will oscillate as the bubble grows or collapses. The period of this oscillation is of the order of the vortex time scale, τV = 2πrc/uθ, max, where rc is the vortex core radius and uθ, m

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5

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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6

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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7

Yao, Shouguang, Tao Huang, Kai Zhao, Jianbang Zeng, and Shuhua Wang. "Simulation of flow boiling of nanofluid in tube based on lattice Boltzmann model." Thermal Science 23, no. 1 (2019): 159–68. http://dx.doi.org/10.2298/tsci160817006y.

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In this study, a lattice Boltzmann model of bubble flow boiling in a tube is established. The bubble growth, integration, and departure of 3% Al2O3-water nanofluid in the process of flow boiling are selected to simulate. The effects of different bubble distances and lateral accelerations a on the bubble growth process and the effect of heat transfer are investigated. Results showed that with an increase in the bubble distance, the bubble coalescence and the effect of heat transfer become gradual. With an increase in lateral acceleration a, the bubble growth is different. When a = 0.5e?7 and a

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8

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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9

Nie Teng-Fei, Xu Qiang, Luo Xin-Yi, Hong Ao-Yue, Cao Ze-Shui, and Guo Lie-Jin. "Kinetic study of oxygen bubble growth in water decomposition." Acta Physica Sinica 74, no. 10 (2025): 0. https://doi.org/10.7498/aps.74.20250014.

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Understanding the oxygen bubble evolution on the electrode surface is important to enhance the efficiency of large-scale water decomposition. In this paper, a numerical model for the growth of oxygen bubbles on the electrode surface based on the dissolved oxygen flux at the bubble boundary is proposed, and the mechanisms of the reaction area and current on the bubble growth are investigated. The results show that the bubble diameters calculated from the oxygen flux at the bubble boundary are in good agreement with the growth of the bubbles in the control phase of the chemical reaction. As the

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10

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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11

Chen, Gang, Xuekui Wang, Bingyang Zhang, et al. "Role of Bubble Evolution in the Bubble-Propelled Janus Micromotors." Micromachines 14, no. 7 (2023): 1456. http://dx.doi.org/10.3390/mi14071456.

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Bubble-propelled Janus micromotors have attracted extensive attention in recent years and have been regarded as powerful tools in the environmental and medical fields due to their excellent movement ability. The movement ability can mainly be attributed to the periodic growth, detachment, and/or collapse of the bubble. However, subjected to the experimental conditions, the mechanism of bubble evolution on the motion of the micromotor could not be elucidated clearly. In this work, a finite element method was employed for exploring the role of bubble evolution in bubble-propelled Janus micromoto

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12

Taqieddin, Amir, Yuxuan Liu, Akram N. Alshawabkeh, and Michael R. Allshouse. "Computational Modeling of Bubbles Growth Using the Coupled Level Set—Volume of Fluid Method." Fluids 5, no. 3 (2020): 120. http://dx.doi.org/10.3390/fluids5030120.

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Understanding the generation, growth, and dynamics of bubbles as they absorb or release dissolved gas in reactive flows is crucial for optimizing the efficiency of electrochemically gas-evolving systems like alkaline water electrolysis or hydrogen production. To better model these bubbly flow systems, we use a coupled level set and volume of fluid approach integrated with a one-fluid transport of species model to study the dynamics of stationary and rising bubbles in reactive two-phase flows. To accomplish this, source terms are incorporated into the continuity and phase conservation equations

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13

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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14

Zhang, Yiping, Mengxian Hu, and Yongchao Zhou. "An Experimental Study on Bubble Growth in Laponite RD as Thixotropic Yield Material." Materials 13, no. 13 (2020): 2887. http://dx.doi.org/10.3390/ma13132887.

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The growth and release of the leading major bubble at the tip of a needle in the thixotropic yield material Laponite RD was different from subsequent minor bubbles. The gas injection experiments combined with high-speed camera were conducted. The results showed that the shape of the major bubbles transformed from an inverted carrot shape to an inverted teardrop shape, while the shape of the minor bubbles tended to be elliptical. In addition, the pressure of bubble emergence consisted of hydrostatic pressure, capillary pressure, and cracking pressure. The major and minor bubbles differed only i

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15

Walsh, C., E. Stride, U. Cheema, and N. Ovenden. "A combined three-dimensional in vitro–in silico approach to modelling bubble dynamics in decompression sickness." Journal of The Royal Society Interface 14, no. 137 (2017): 20170653. http://dx.doi.org/10.1098/rsif.2017.0653.

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The growth of bubbles within the body is widely believed to be the cause of decompression sickness (DCS). Dive computer algorithms that aim to prevent DCS by mathematically modelling bubble dynamics and tissue gas kinetics are challenging to validate. This is due to lack of understanding regarding the mechanism(s) leading from bubble formation to DCS. In this work, a biomimetic in vitro tissue phantom and a three-dimensional computational model, comprising a hyperelastic strain-energy density function to model tissue elasticity, were combined to investigate key areas of bubble dynamics. A sens

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16

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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17

Tiwari, A., C. Pantano, and J. B. Freund. "Growth-and-collapse dynamics of small bubble clusters near a wall." Journal of Fluid Mechanics 775 (June 16, 2015): 1–23. http://dx.doi.org/10.1017/jfm.2015.287.

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The violent collapse of bubble clusters is thought to damage adjacent material in both engineering and biomedical applications. Yet the complexities of the root mechanisms have restricted theoretical descriptions to significantly simplified configurations. Reduced-physics models based upon either homogenization or arrays of idealized spherical bubbles do reproduce important gross cluster-scale features. However, these models neglect detailed local bubble–bubble interactions, which are expected to mediate damage mechanisms. To describe these bubble-scale interactions, we simulate the expansion

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18

Michelin, Sébastien, Giacomo Gallino, François Gallaire, and Eric Lauga. "Viscous growth and rebound of a bubble near a rigid surface." Journal of Fluid Mechanics 860 (December 3, 2018): 172–99. http://dx.doi.org/10.1017/jfm.2018.876.

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Motivated by the dynamics of microbubbles near catalytic surfaces in bubble-powered microrockets, we consider theoretically the growth of a free spherical bubble near a flat no-slip surface in a Stokes flow. The flow at the bubble surface is characterised by a constant slip length allowing us to tune the hydrodynamic mobility of its surface and tackle in one formulation both clean and contaminated bubbles as well as rigid shells. Starting with a bubble of infinitesimal size, the fluid flow and hydrodynamic forces on the growing bubble are obtained analytically. We demonstrate that, depending o

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19

Yao, Shun, Yichong Chen, Yijie Ling, Dongdong Hu, Zhenhao Xi, and Ling Zhao. "Analysis of Bubble Growth in Supercritical CO2 Extrusion Foaming Polyethylene Terephthalate Process Based on Dynamic Flow Simulation." Polymers 13, no. 16 (2021): 2799. http://dx.doi.org/10.3390/polym13162799.

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Bubble growth in the polymer extrusion foaming process occurs under a dynamic melt flow. For non-Newtonian fluids, this work successfully coupled the dynamic melt flow simulation with the bubble growth model to realize bubble growth predictions in an extrusion flow. The initial thermophysical properties and dynamic rheological property distribution at the cross section of the die exit were calculated based on the finite element method. It was found that dynamic rheological properties provided a necessary solution for predicting bubble growth during the supercritical CO2 polyethylene terephthal

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20

Wang, Huigang, Chengyu Zhang, and Hongbing Xiong. "Growth and Collapse Dynamics of a Vapor Bubble near or at a Wall." Water 13, no. 1 (2020): 12. http://dx.doi.org/10.3390/w13010012.

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This study investigated the dynamics of vapor bubble growth and collapse for a laser-induced bubble. The smoothed particle hydrodynamics (SPH) method was utilized, considering the liquid and vapor phases as the van der Waals (VDW) fluid and the solid wall as a boundary. We compared our numerical results with analytical solutions of bubble density distribution and radius curve slope near a wall and the experimental bubble shape at a wall, which all obtained a fairly good agreement. After validation, nine cases with varying heating distances (L2 to L4) or liquid heights (h2 to h10) were simulate

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21

Stanic, Nikolina, and Espen Sandnes. "Bubble Behavior on Horizontal and Vertical Carbon Anode Surfaces in Cryolite Melt Applying a See-Through Cell." Materials Proceedings 3, no. 1 (2021): 8. http://dx.doi.org/10.3390/iec2m-09238.

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Gas bubble behavior on a carbon anode in a cryolite melt has been studied by visual observation using a see-through cell. The bubble phenomena studied have included growth, coalescence, and detachment during electrolysis. Two different anode designs were tested, an anode with a horizontal facing-downwards surface and an anode with a vertical surface. At the horizontal anode, it was found that one large bubble was formed by the growth and coalescence of smaller bubbles, and finally, the large bubble detached periodically. For the vertical anode surface, many smaller bubbles were formed and deta

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22

TOMITA, Y., P. B. ROBINSON, R. P. TONG, and J. R. BLAKE. "Growth and collapse of cavitation bubbles near a curved rigid boundary." Journal of Fluid Mechanics 466 (September 10, 2002): 259–83. http://dx.doi.org/10.1017/s0022112002001209.

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Laser-induced cavitation bubbles near a curved rigid boundary are observed experimentally using high-speed photography. An image theory is applied to obtain information on global bubble motion while a boundary integral method is employed to gain a more detailed understanding of the behaviour of a liquid jet that threads a collapsing bubble, creating a toroidal bubble. Comparisons between the theory and experiment show that when a comparable sized bubble is located near a rigid boundary the bubble motion is significantly influenced by the surface curvature of the boundary, which is characterize

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23

Foster, Philip P., Alan H. Feiveson, Roland Glowinski, Michael Izygon, and Aladin M. Boriek. "A model for influence of exercise on formation and growth of tissue bubbles during altitude decompression." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 279, no. 6 (2000): R2304—R2316. http://dx.doi.org/10.1152/ajpregu.2000.279.6.r2304.

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In response to exercise performed before or after altitude decompression, physiological changes are suspected to affect the formation and growth of decompression bubbles. We hypothesized that the work to change the size of a bubble is done by gas pressure gradients in a macro- and microsystem of thermodynamic forces and that the number of bubbles formed through time follows a Poisson process. We modeled the influence of tissue O2 consumption on bubble dynamics in the O2transport system in series against resistances, from the alveolus to the microsystem containing the bubble and its surrounding

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24

Wang, Yuliang, Mikhail E. Zaytsev, Guillaume Lajoinie, et al. "Giant and explosive plasmonic bubbles by delayed nucleation." Proceedings of the National Academy of Sciences 115, no. 30 (2018): 7676–81. http://dx.doi.org/10.1073/pnas.1805912115.

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When illuminated by a laser, plasmonic nanoparticles immersed in water can very quickly and strongly heat up, leading to the nucleation of so-called plasmonic vapor bubbles. While the long-time behavior of such bubbles has been well-studied, here, using ultrahigh-speed imaging, we reveal the nucleation and early life phase of these bubbles. After some delay time from the beginning of the illumination, a giant bubble explosively grows, and collapses again within 200 μs (bubble life phase 1). The maximal bubble volume Vmax remarkably increases with decreasing laser power, leading to less total d

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25

Maria, Naomi Sta, and David M. Eckmann. "Model Predictions of Gas Embolism Growth and Reabsorption during Xenon Anesthesia." Anesthesiology 99, no. 3 (2003): 638–45. http://dx.doi.org/10.1097/00000542-200309000-00019.

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Background It is not readily obvious whether an intravascular bubble will grow or shrink in a particular tissue bed. This depends on the constituent gases initially present in the bubble, the surrounding tissue, and the delivered gas admixture. The authors used a computational model based on the physics of gas exchange to predict cerebrovascular embolism behavior during xenon anesthesia. Methods The authors estimated values of gas transport parameters missing from the literature. The computational model was used with those parameters to predict bubble size over time for a range of temperatures

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26

Sato, K. "Occurrence of Bubbles in a Thin Wire at Low Reynolds Number." Journal of Fluids Engineering 114, no. 2 (1992): 255–60. http://dx.doi.org/10.1115/1.2910024.

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Thin wires of various diameters from 0.07 to 0.7 mm are examined about appearances and characteristics of bubble occurrence behind them in the range of low Reynolds numbers. The appearance of bubbles is very dependent on diameters of wires. Two different types of bubbles can be observed in the present experiment. One is a streamer-type bubble for smaller wires and the other is a small unspherical bubble for larger wires. The incipient and the desinent values of cavitation number also change greatly with the bubble types. The streamer-type bubble is related to the presence of laminar separation

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27

Moreno Soto, Álvaro, Andrea Prosperetti, Detlef Lohse, and Devaraj van der Meer. "Gas depletion through single gas bubble diffusive growth and its effect on subsequent bubbles." Journal of Fluid Mechanics 831 (October 13, 2017): 474–90. http://dx.doi.org/10.1017/jfm.2017.623.

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When a gas bubble grows by diffusion in a gas–liquid solution, it affects the distribution of gas in its surroundings. If the density of the solution is sensitive to the local amount of dissolved gas, there is the potential for the onset of natural convection, which will affect the bubble growth rate. The experimental study of the successive quasi-static growth of many bubbles from the same nucleation site described in this paper illustrates some consequences of this effect. The enhanced growth due to convection causes a local depletion of dissolved gas in the neighbourhood of each bubble beyo

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28

Chu, Jie, and Xiaofei Xu. "Bubble Growth in Poly(methyl methacrylate) and Carbon Dioxide Mixture." Polymers 11, no. 4 (2019): 648. http://dx.doi.org/10.3390/polym11040648.

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In this paper, we study bubble nucleation and growth in a poly(methyl methacrylate) and CO 2 mixture by molecular dynamics simulations. It is known in the foaming industry that the bubble size has a more uniform distribution with a higher start-up pressure. The real physical reason remains unclear. In this work, we found that the free volume-rich polymer segments could adsorb many small-size bubbles in the region close to the polymer chain. The existence of these small bubbles limits the number of free CO 2 molecules, which is helpful for bubble stabilization. Moreover, the free volume of poly

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Chen, Rouxi, Yuqin Wan, Na Si, Ji-Huan He, Frank Ko, and Shu-Qiang Wang. "Bubble rupture in bubble electrospinning." Thermal Science 19, no. 4 (2015): 1141–49. http://dx.doi.org/10.2298/tsci1504141c.

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As the distinctive properties and different applications of nanofibers, the demand of nanofibers increased sharply in recently years. Bubble electrospinning is one of the most effective and industrialized methods for nanofiber production. To optimize the set-up of bubble electrospinning and improve its mass production, the dynamic properties of un-charged and charged bubbles are studied experimentally, the growth and rupture process of a bubble are also discussed in this paper.

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Hu, Xiaowei, Liejin Guo, and Yechun Wang. "In Situ Measurement of Local Hydrogen Production Rate by Bubble-Evolved Recording." International Journal of Photoenergy 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/568206.

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Hydrogen visibly bubbles during photocatalytic water splitting under illumination with above-bandgap radiation, which provides a direct measurement of local gas-evolving reaction rate. In this paper, optical microscopy of superfield depth was used for recording the hydrogen bubble growth on Cd0.5Zn0.5S photocatalyst in reaction liquid and illuminated with purple light. By analyzing change of hydrogen bubble size as a function of time, we understood that hydrogen bubble growth experienced two periods, which were inertia effect dominated period and diffusion effect dominated period, respectively

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Arhar, Klara, Matic Može, Matevž Zupančič, and Iztok Golobič. "Evaluation of Hydrogen Bubble Growth on a Platinum Microelectrode Under Varying Electrical Potential." Applied Sciences 15, no. 8 (2025): 4107. https://doi.org/10.3390/app15084107.

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Green hydrogen, produced via electrolysis using renewable energy, is a zero-emission fuel essential for the global transition to sustainable energy systems. Optimizing hydrogen production requires a detailed understanding of bubble dynamics at the cathode, which involves three key stages: nucleation, growth, and detachment. In this study, hydrogen bubble growth was investigated in a custom-built electrolysis cell with microelectrodes, combining high-speed imaging and electrochemical measurements with a potentiostat. The results reveal distinct growth regimes governed by a potential-dependent t

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CHOI, JAEHYUG, and STEVEN L. CECCIO. "Dynamics and noise emission of vortex cavitation bubbles." Journal of Fluid Mechanics 575 (March 2007): 1–26. http://dx.doi.org/10.1017/s0022112006003776.

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The growth and collapse of a cavitation bubble forming within the core of a line vortex was examined experimentally to determine how the dynamics and noise emission of the elongated cavitation bubble is influenced by the underlying non-cavitating vortex properties. A steady line vortex was formed downstream of a hydrofoil mounted in the test section of a recirculating water channel. A focused pulse of laser light was used to initiate a nucleus in the core of a vortex, allowing for the detailed examination of the growth, splitting and collapse of individual cavitation bubbles as they experience

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Miller, R. S. "Photographic Observations of Bubble Formation in Flashing Nozzle Flow." Journal of Heat Transfer 107, no. 4 (1985): 750–55. http://dx.doi.org/10.1115/1.3247500.

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Visual observations have been made of bubble growth in the nucleation region of flashing flow of initially subcooled water in a converging-diverging nozzle. Experiments performed under various flow rates, saturation temperatures, turbulence levels, noncondensable gas content, and artificial nucleation sites failed to produce isolated spherical bubbles of the size or density predicted by common bubble nucleation and growth models. Heterogeneous nucleation in the bulk flow was never observed and it is concluded from bubble growth rates that the role of convection in the heat and mass transfer en

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34

Gao, Xianming, Fangcai Lu, Wang Zhang, and Wenxuan Yang. "Experimental Study on the Effect of Microchannel Spacing and Fractal Angle on Bubble Growth Behavior." Machines 11, no. 9 (2023): 862. http://dx.doi.org/10.3390/machines11090862.

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Bubble growth behavior significantly influences boiling heat transfer performance, and different microchannel structures and configurations affect bubble growth behavior. To explore the impact of microchannel structures and configurations on the growth behavior of boiling bubbles, two types of microchannel test plates were fabricated on copper substrates using laser machining technology. It was a parallel configuration plate with five different microchannel spacings and a blade vein configuration plate with four different fractal angles. The bubble growth behavior on these two types of surface

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35

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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Nourhani, Amir, Emil Karshalev, Fernando Soto, and Joseph Wang. "Multigear Bubble Propulsion of Transient Micromotors." Research 2020 (February 21, 2020): 1–9. http://dx.doi.org/10.34133/2020/7823615.

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Transient, chemically powered micromotors are promising biocompatible engines for microrobots. We propose a framework to investigate in detail the dynamics and the underlying mechanisms of bubble propulsion for transient chemically powered micromotors. Our observations on the variations of the micromotor active material and geometry over its lifetime, from initial activation to the final inactive state, indicate different bubble growth and ejection mechanisms that occur stochastically, resulting in time-varying micromotor velocity. We identify three processes of bubble growth and ejection, and

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Randsøe, T., T. M. Kvist, and O. Hyldegaard. "Effect of oxygen and heliox breathing on air bubbles in adipose tissue during 25-kPa altitude exposures." Journal of Applied Physiology 105, no. 5 (2008): 1492–97. http://dx.doi.org/10.1152/japplphysiol.90840.2008.

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At altitude, bubbles are known to form and grow in blood and tissues causing altitude decompression sickness. Previous reports indicate that treatment of decompression sickness by means of oxygen breathing at altitude may cause unwanted bubble growth. In this report we visually followed the in vivo changes of micro air bubbles injected into adipose tissue of anesthetized rats at 101.3 kPa (sea level) after which they were decompressed from 101.3 kPa to and held at 25 kPa (10,350 m), during breathing of oxygen or a heliox(34:66) mixture (34% helium and 66% oxygen). Furthermore, bubbles were stu

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den Brok, Bas, Cees Passchier, and Michel Sieber. "Fibre growth in wet salt aggregates in a temperature gradient field." Mineralogical Magazine 62, no. 04 (1998): 527–32. http://dx.doi.org/10.1180/002646198547792.

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Abstract Intense fibrosity develops in wet porous NaCl crystal aggregates (grain size 250–500 µm) held in a temperature (T) gradient field (0.5–4°C/mm) at temperatures between 20 and 50–60°C. In situ microscopic observation of the process shows that fibre growth is associated with T-gradient driven motion of tiny gas (air, water vapour) bubbles present in the saturated intercrystalline aqueous NaCl solution. Gas bubbles move through the intercrystalline pore fluid into the cold direction. They only move if they are next to an NaCl crystal; bubbles that are ‘free’ do not move. Each bubble is ‘p

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Randsoe, Thomas, and Ole Hyldegaard. "Effect of oxygen breathing on micro oxygen bubbles in nitrogen-depleted rat adipose tissue at sea level and 25 kPa altitude exposures." Journal of Applied Physiology 113, no. 3 (2012): 426–33. http://dx.doi.org/10.1152/japplphysiol.00193.2012.

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The standard treatment of altitude decompression sickness (aDCS) caused by nitrogen bubble formation is oxygen breathing and recompression. However, micro air bubbles (containing 79% nitrogen), injected into adipose tissue, grow and stabilize at 25 kPa regardless of continued oxygen breathing and the tissue nitrogen pressure. To quantify the contribution of oxygen to bubble growth at altitude, micro oxygen bubbles (containing 0% nitrogen) were injected into the adipose tissue of rats depleted from nitrogen by means of preoxygenation (fraction of inspired oxygen = 1.0; 100%) and the bubbles stu

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Lü, M., Z. Ning, K. Yan, J. Fu, and C. H. Sun. "Numerical Simulation of Cavitation Bubble Growth within a Droplet." Journal of Mechanics 32, no. 2 (2015): 211–17. http://dx.doi.org/10.1017/jmech.2015.57.

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ABSTRACTCavitation bubbles, which always exist in the diesel jet leaving the nozzle and in diesel droplets breaking up from the jet as a result of supercavitation of the diesel within the injection nozzle, increase the instability of jet and droplets in part due to the two-phase mixture, while the mechanism of this effect is still unclear. Cavitation bubble expansion within the diesel droplet has been simulated numerically based on the volume of fluid (VOF) method, and the control mechanism of bubble growth process is analyzed by Rayleigh-Plesset equation. The process of bubble growth is divid

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Kolomietz, V. M. "Bubble instability in overheated liquid Helium-3." Modern Physics Letters B 28, no. 28 (2014): 1450221. http://dx.doi.org/10.1142/s0217984914502212.

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The generation and the growth of vapor bubbles in metastable liquid Helium-3 are studied. The finite diffuse layer of vapor bubble, the temperature dependence of the surface tension and the relaxation processes are taken into consideration. We show that the growth of bubble in overheated liquid Helium-3 is significantly influenced by the memory effects caused by the dynamic Fermi-surface distortions. In particular, the increase of bubble is strongly hindered and accompanied by the characteristic oscillations of the bubble radius. The oscillations of the bubble radius disappear in a short relax

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Moreno Soto, Álvaro, Oscar R. Enríquez, Andrea Prosperetti, Detlef Lohse, and Devaraj van der Meer. "Transition to convection in single bubble diffusive growth." Journal of Fluid Mechanics 871 (May 20, 2019): 332–49. http://dx.doi.org/10.1017/jfm.2019.276.

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We investigate the growth of gas bubbles in a water solution at rest with a supersaturation level that is generally associated with diffusive mass transfer. For $\text{CO}_{2}$ bubbles, it has been previously observed that, after some time of growing in a diffusive regime, a density-driven convective flow enhances the mass transfer rate into the bubble. This is due to the lower density of the gas-depleted liquid which surrounds the bubble. In this work, we report on experiments with different supersaturation values, measuring the time $t_{conv}$ it takes for convection to dominate over the dif

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Boziuk, Thomas R., Marc K. Smith, and Ari Glezer. "Dynamics of vapor bubble condensation under directional ultrasonic actuation." Physics of Fluids 35, no. 1 (2023): 017126. http://dx.doi.org/10.1063/5.0134326.

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Direct-contact condensation of vapor bubbles injected into a subcooled liquid is enhanced using ultrasonic O(1 MHz) acoustic actuation. In the absence of actuation, the surface tension-driven pinch-off process of the vapor bubble from the injection orifice induces a liquid spear that travels upward through the bubble and ruptures the top interface to form a toroidal bubble. Similarly, the acoustic actuator produces a narrow high-intensity acoustic beam that deforms the top interface of the vapor bubble via radiation pressure to form a liquid spear that travels downward though the bubble and ru

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Mohammadein, S. A., and A. F. Abu-Bakr. "The growth of vapour bubble in a superheated liquid between two phase turbulent flow." Canadian Journal of Physics 88, no. 5 (2010): 317–24. http://dx.doi.org/10.1139/p10-022.

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In this paper, the growth of a vapour bubble in superheated water for two-phase turbulent flow is studied. The growth problem is formulated by mass and momentum equations under physical assumptions between two finite boundaries. The analytical solution is obtained in terms of the vapour bubble radius. The bubbly growth is affected by thermal diffusivity, superheating, and the Péclet number. The fact that the scale of the bubble is larger than the scale of the turbulence in the mixture surrounding the growing bubble is considered. The previous models of growth for laminar flow are obtained as a

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Kendoush, Abdullah Abbas. "Viscous Fluid Displacement by the Growing Bubble." Journal of Heat Transfer 128, no. 1 (2005): 100–103. http://dx.doi.org/10.1115/1.2130409.

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Equations were derived for the forces experienced by the growing bubble in displacing the liquid radially. The derivation was based on integrating the viscous dissipation function over the entire surface of the bubble. The resulted equations were applicable to bubbles in boiling and in cavitation. The derived equations were validated by applying them to the heterogeneous nucleation and growth of bubbles from cavities in pool boiling and in cavitation. The derived equations approached asymptotically the familiar equation of heterogeneous nucleation and growth of bubbles.

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Sarkar, Shahjahan K. A., Piotr M. Machniewski, and Geoffrey M. Evans. "Modelling and Measurement of Bubble Formation and Growth in Electroflotation Processes." Chemical and Process Engineering 34, no. 3 (2013): 327–36. http://dx.doi.org/10.2478/cpe-2013-0026.

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Abstract Electroflotation is used in the water treatment industry for the recovery of suspended particles. In this study the bubble formation and release of hydrogen bubbles generated electrolytically from a platinum cathode was investigated. Previously, it was found that both the growth rate and detachment diameter increased with increasing wire diameter. Conversely, current density had little effect on the released bubble size. It was also found that the detached bubbles rapidly increased in volume as they rose through the liquid as a result of decreasing hydrostatic pressure and high levels

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Randsoe, T., and O. Hyldegaard. "Effect of oxygen breathing and perfluorocarbon emulsion treatment on air bubbles in adipose tissue during decompression sickness." Journal of Applied Physiology 107, no. 6 (2009): 1857–63. http://dx.doi.org/10.1152/japplphysiol.00785.2009.

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Decompression sickness (DCS) after air diving has been treated with success by means of combined normobaric oxygen breathing and intravascular perfluorocarbon (PFC) emulsions causing increased survival rate and faster bubble clearance from the intravascular compartment. The beneficial PFC effect has been explained by the increased transport capacity of oxygen and inert gases in blood. However, previous reports have shown that extravascular bubbles in lipid tissue of rats suffering from DCS will initially grow during oxygen breathing at normobaric conditions. We hypothesize that the combined ef

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Abu-Nab, Ahmed K., Amerah M. Hakami, and Ali F. Abu-Bakr. "Charged Cavitation Multibubbles Dynamics Model: Growth Process." Mathematics 12, no. 4 (2024): 569. http://dx.doi.org/10.3390/math12040569.

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The nonlinear dynamics of charged cavitation bubbles are investigated theoretically and analytically in this study through the Rayleigh–Plesset model in dielectric liquids. The physical and mathematical situations consist of two models: the first one is noninteracting charged cavitation bubbles (like single cavitation bubble) and the second one is interacting charged cavitation bubbles. The proposed models are formulated and solved analytically based on the Plesset–Zwick technique. The study examines the behaviour of charged cavitation bubble growth processes under the influence of the polytro

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Zhang, Yong, Chuanbao Jia, Jianxin Wang, Bo Zhao, and Chuansong Wu. "Investigation on the bubble dynamic behaviors and corresponding regulation method in underwater flux-cored arc welding." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 233, no. 7 (2018): 1808–17. http://dx.doi.org/10.1177/0954405418789983.

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Observed two bubble growth modes indicated that the stability of arc burning and bubble growth relied on each other. Under selected welding parameters, the maximum diameters of generated bubbles complied with approximately normal distribution. Higher preset welding parameters generated larger bubbles with gradually receding influences. Vaporization, condensation, and reactions happened rapidly inside the bubbles even after detachment and when coming to water surface. Gas-assisted underwater flux-cored arc welding was proposed to improve the slag coverage. This method was also effective in achi

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Brondi, Cosimo, Mercedes Santiago-Calvo, Ernesto Di Maio, and Miguel Ángel Rodríguez-Perez. "Role of Air Bubble Inclusion on Polyurethane Reaction Kinetics." Materials 15, no. 9 (2022): 3135. http://dx.doi.org/10.3390/ma15093135.

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In this study, we investigated the influence of mixing conditions on the foaming process of water blown polyurethane (PU) foams obtained at different mixing speeds (50, 500, 1000 and 2000 rpm). In particular, the morphological evolution during the foaming process, in terms of the bubble size and bubble density, was studied via optical observations, while the effects on the reaction kinetics were monitored using in situ FTIR spectroscopy. At the slow mixing speed (50 rpm), no air bubbles were included and the early foaming process was characterized by the formation of new bubbles (CO2 nucleatio

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