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Relevant bibliographies by topics / Bubble growth

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Academic literature on the topic 'Bubble growth'

Author: Grafiati

Published: 4 June 2021

Last updated: 20 February 2023

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Journal articles on the topic "Bubble growth"

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 dynamics, mass transfer and hydrodynamics was coupled by using Computational Fluid Dynamics (CFD) and bubble nucleation and growth model. Generally, the bubbles nucleate at the throat of the nozzle and grow along with the flow. Therefore, only the region after the throat of the nozzle has bubbles. This approach is expected to be useful for various types of bubbly flow modelling in supersaturated condition.

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2

Martin, Alberto, and Jaume Ventura. "Economic Growth with Bubbles." American Economic Review 102, no. 6 (October 1, 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 provide a natural way of introducing bubble shocks into business cycle models. (JEL E22, E23, E32, E44, O41)

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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 speed. This equation is then cast into a nonlinear dynamical system of scaled variables which describe deviations of the flow field from its corresponding incompressible single-phase value. The solution of the initial-value problem of this dynamical system can be carried out very accurately, leading to an exact description of the hydrodynamic field for the model considered.A bubbly liquid composed of water vapour–air bubbles in water at 20 °C for two different area variations is considered, and the initial cavitation number is chosen in such a way that cavitation can occur in the nozzle. Results obtained, when bubble/bubble interactions are neglected, show solutions with flow instabilities, similar to the flashing flow solutions found recently by Wang and Brennen. Stable steady-state cavitating nozzle flow solutions, either with continuous growth of bubbles or with growth followed by collapse of bubbles, were obtained when bubble/bubble interactions were considered together with various damping mechanisms.

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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, max is its maximum tangential velocity. However, the period, oscillation amplitude and final bubble radius are sensitive to variations in the vortex properties and the rate and magnitude of the pressure reduction or increase. The growth and collapse of three-dimensional bubbles are reminiscent of the two-dimensional bubble dynamics. But, the axial and radial growth of the vortex bubbles are often strongly coupled, especially near the axial extents of the bubble. As an initially spherical nucleus grows into an elongated bubble, it may take on complex shapes and have volume oscillations that also scale with τV. Axial flow produced at the ends of the bubble can produce local pinching and fission of the elongated bubble. Again, small changes in flow parameters can result in substantial changes to the detailed volume history of the bubbles.

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Battistella, Alessandro, Sander Aelen, Ivo Roghair, and Martin van Sint Annaland. "Euler–Lagrange Modeling of Bubbles Formation in Supersaturated Water." ChemEngineering 2, no. 3 (August 24, 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 model is able to initialize gas pockets (as spherical bubbles) representing randomly generated conical nucleation sites, which can host, grow and detach a bubble. To demonstrate its capabilities, the model was used to study the formation of bubbles on a surface as a result of supersaturation. A higher supersaturation results in a faster rate of nucleation, which means more bubbles in the column. A clear depletion effect could be observed during the initial growth of the bubbles, due to insufficient mixing.

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Zhou, Ge. "THE SPIRIT OF CAPITALISM AND RATIONAL BUBBLES." Macroeconomic Dynamics 20, no. 6 (June 30, 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 properly can eliminate bubbles and achieve the social optimum.

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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 (December 4, 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 bubbles, the number of bubbles in the bubble group, and the distance between bubbles. The initial radius of the bubbles and the distance between bubbles are found to have more significant influence on the resonance frequency of the bubbles. When the distance between bubbles increases to 20 times the bubbles’ initial radius, the coupling effect between bubbles can be ignored, and after that the bubbles’ resonance frequency in the bubble group tends to the resonance frequency of a single bubble’s resonance frequency. Fluent software is used to simulate the bubble growth, shrinkage, and collapse of five and seven bubbles under an ultrasonic field. The simulation results show that when the bubble breaks, the two bubbles at the outer field first begin to break and form a micro-jet along the axis line of the bubbles. Our methods and conclusions will provide a reference for further simulations and indicate the significance of the prevention or utilization of cavitation.

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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 = 0.5e?6, the bubble growth includes the process of bubble growth, coalescence, detachment, and fusion with the top bubble and when a = 0.5e?5 and a = 0.5e?4, the bubbles only experience growth and fusion, and the bubbles do not merge with the top bubble directly to the right movement because the lateral acceleration is too large, resulting in the enhanced effect of heat transfer in the tube.

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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 (July 23, 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 to allow the bubble to grow or shrink as the species moves through the interface. Verification of the hydrodynamics of the solver for non-reactive systems demonstrates the requisite high fidelity interface capturing and mass conservation necessary to incorporate transport of species. In reactive systems where the species impacts the bubble volume, the model reproduces the theoretically predicted and experimentally measured diffusion-controlled growth rate (i.e., R(t)∝t0.5). The model is then applied to rising bubbles to demonstrate the impact of transport of species on both the bubble velocity and shape as well as the concentration field in its wake. This improved model enables the incorporation of electric fields and chemical reactions that are essential for studying the physicochemical hydrodynamics in multiphysics systems.

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Su, Chi-Wei, Lu Liu, and Kai-Hua Wang. "Do Bubble Behaviors Exist in Chinese Film Stocks?" SAGE Open 10, no. 4 (October 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 the bubble’s negative impacts persist and the film industry is still having problems such as declining industrial output. Economic growth, film quality, and industrial policies are common factors for all bubbles. The global financial crisis, capital in- and outflows, internet giants’ entry and sky-high remuneration are reasons for certain bubble behaviors. Hence, market practitioners should actively recognize bubbles and observe their evolution, which will favor industrial stabilization. A perfect legal system, moderate industrial policies, a competitive market environment, and other measures are needed to confront the opportunities and challenges.

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Dissertations / Theses on the topic "Bubble growth"

1

Robinson, Anthony James Judd R. L. "Bubble growth dynamics in boiling /." *McMaster only, 2003.

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Cyr, David Robert. "Bubble growth behavior in supersaturated liquid solutions." Fogler Library, University of Maine, 2001. http://www.library.umaine.edu/theses/pdf/CyrDR2001.pdf.

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Mori, Brian Katsuo. "Studies of bubble growth and departure from artificial nucleation sites." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0009/NQ35258.pdf.

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Vidinha, Tania Dos Santos Moreno. "Theoretical and experimental studies of bubble growth at an orifice." Thesis, University of Strathclyde, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275186.

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Marshall, Stephen Henry. "Air bubble formation from an orifice with liquid cross-flow." Phd thesis, Faculty of Engineering, 1992. http://hdl.handle.net/2123/5343.

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Fan, Jintian. "Bubble growth and starch conversion in extruded and baked cereal systems." Thesis, University of Nottingham, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260706.

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Hilton, Matthew. "Rhyolite degassing : an experimental study." Thesis, University of Bristol, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245574.

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8

Bai, Liping. "Experimental study of bubble growth in Stromboli basalt melts at 1 atmosphere." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=101831.

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In order to investigate bubble formation and growth at 1 atmosphere, degassing experiments using a Stromboli basalt with dissolved H2O or H2O + CO2 were performed in a custom furnace on a beamline at the Advanced Photon Source. The glasses were synthesized at 1250°C and 1000 MPa, with ~3.0 wt%, ~5.0 wt%, or ~7.0 wt% H2O or with mixtures of H2O + CO2, ~3.0 wt% H2O and ~440 ppm CO2, ~5.0 wt% H2O and 880 ppm CO2, ~7.0 wt% H2O and ~1480 ppm CO2, then heated on the beamline while recording the bubble growth. The 3D bubble size distributions in the quenched samples were then studied with synchrotron X-ray microtomography.
The experimental results show that bubble nucleation and growth are volatile-concentration dependent. Bubbles can easily nucleate in melts initially containing high volatile concentrations. CO2 has no significant effect on bubble formation and growth because of low CO2 concentrations. Multiple nucleation events occur in most of these degassing samples, and they are more pronounced in more supersaturated melts. Bubble growth is initially controlled by viscosity near glass transition temperatures and by diffusion at higher temperatures where melt viscous relaxation occurs rapidly. Bubble foam forms when bubbles are highly connected due to coalescence, and bubbles begin pop, 10 to 20 seconds after the foam is developed. The degree of bubble coalescence increases with time, and bubble coalescence can significantly change the bubble size distribution. Bubble size distributions follow power-law relations at vesicularities of 1.0% to 65%, and bubble size distributions evolve from power-law relations to exponential relations at vesicularities of 65% to 83%. This evolution is associated with the change from far-from-equilibrium degassing to near-equilibrium degassing.
The experimental results imply that during basaltic eruptions both far-from-equilibrium degassing and near-equilibrium degassing can occur. The far-from-equilibrium degassing generally generates the power-law bubble size distributions whereas the near-equilibrium degassing produces exponential bubble size distributions Bubbles begin to pop when the vesicularities attain 65% to 83%. Bubble expansion in the foam possibly accounts for the mechanism of magma fragmentation.
Afin d'étudier la formation et la croissance de bulle; sous pression d'une atmosphère, desexpériences de dégazage sur un basalte de Stromboli, avec HiO ou H20 + CO2 dissouts,ont été exécutées dans un four pilote sous rayonnement synchrotron à l'APS (AdvancedPhoton Source). Les verres ont été synthétisés à une température de 1250°C et unepression de 1000 MPa, avec des teneurs en eau dissoute de ~ 3.0, ~ 5.0 ou ~ 7.0% (enpoids), et des mélanges H20 + C02 à teneurs de ~ 3.0% H20 (en poids) et 440 ppm CO2,~ 5% H20 et 880 ppm CO2, et de ~ 7.0% H20 et 1480 ppm CO2. La croissance des bullesest enregistrée pendant le chauffage du mélange en utilisant le rayonnement synchrotron.Les distributions tridimensionnelles de la taille des bulles dans les échantillons trempésont été étudiées par microtomographie à rayon X synchrotron.

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Lapeyronie, Octave Serge Christian Marie. "The Brazilian real state market in 2012: robust growth or speculative bubble?" reponame:Repositório Institucional do FGV, 2012. http://hdl.handle.net/10438/10333.

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Submitted by Eliene Soares da Silva (eliene.silva@fgv.br) on 2012-12-26T12:21:55Z No. of bitstreams: 1 Octave_Thesis final_2012.pdf: 908204 bytes, checksum: e7ca97f82bb0014fec615367ceb99499 (MD5)
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Rising home prices in Brazil have sparked debate on a possible housing bubble. In light of the credit and housing crisis in the United States, it is fair to question whether or not Brazil’s situation is analogous. Looking at both quantitative and fundamental arguments, we examine the context of the Brazilian housing boom and question its sustainability in the near term. First, home prices tested with basic rental yields and affordability ratios as well an imputed rent model to assess their relative to equilibrium levels. Second, we examine some fundamental factors affecting housing prices – supply and demand, credit and regulation, cultural factors – to find evidence justifying the rising home prices. From these observations, we attempt to draw rational inferences on the likely near future evolution of the Brazilian housing market. While data suggests that home prices are overvalued in comparison to rent levels, there is an evidence of legitimate new housing demand in the rising middle class. A more serious risk may lie in the credit markets in that the Brazilian consumer is already highly leveraged. Nevertheless, we find no evidence suggesting more than a temporary slowdown or correction of home prices.
A forte alta dos imóveis no Brasil nos últimos anos iniciou um debate sobre a possível existência de uma bolha especulativa. Dada a recente crise do crédito nos Estados Unidos, é factível questionar se a situação atual no Brasil pode ser comparada à crise americana. Considerando argumentos quantitativos e fundamentais, examina-se o contexto imobiliário brasileiro e questiona-se a sustentabilidade em um futuro próximo. Primeiramente, analisou-se a taxa de aluguel e o nível de acesso aos imóveis e também utilizou-se um modelo do custo real para ver se o mercado está em equilíbrio o não. Depois examinou-se alguns fatores fundamentais que afetam o preço dos imóveis – oferta e demanda, crédito e regulação, fatores culturais – para encontrar evidências que justificam o aumento dos preços dos imóveis. A partir dessas observações tentou-se chegar a uma conclusão sobre a evolução dos preços no mercado imobiliário brasileiro. Enquanto os dados sugerem que os preços dos imóveis estão supervalorizados em comparação ao preço dos aluguéis, há evidências de uma legítima demanda por novos imóveis na emergente classe média brasileira. Um risco maior pode estar no mercado de crédito, altamente alavancado em relação ao consumidor brasileiro. No entanto, não se encontrou evidências que sugerem mais do que uma temporária estabilização ou correção no preço dos imóveis.

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Li, Weizhong. "A numerical investigation on the behaviour of a rising bubble in a quiescent hot liquid." Thesis, Nottingham Trent University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369237.

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Books on the topic "Bubble growth"

1

Gardner, C. L. The dynamics of bubble growth for Rayleigh-Taylor unstable interfaces. New York: Courant Mathematics and Computing Laboratory, New York University, 1987.

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Gardner, Carl. The dynamics of bubble growth for Rayleigh-Taylor unstable interfaces. New York: Courant Institute of Mathematical Sciences, New York University, 1987.

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service), SpringerLink (Online, ed. Postwar Japanese Economy: Lessons of Economic Growth and the Bubble Economy. New York, NY: Springer Science+Business Media, LLC, 2010.

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Smith, Ian Heaton. A study of foam stability and the kinetics of bubble growth in glass at high temperatures. Salford: University of Salford, 1987.

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5

Martin, Alberto. Economic growth with bubbles. Cambridge, MA: National Bureau of Economic Research, 2010.

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Yanagawa, Noriyuki. Asset bubbles and endogenous growth. Cambridge, MA: National Bureau of Economic Research, 1992.

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Meier, G. E. A. Flows with phase transition: EUROMECH Colloquium 331. Koln: DLR, 1995.

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Binswanger, Mathias. Stock markets, speculative bubbles and economic growth: New dimensions in the co-evolution of real and financial markets. Northampton, Mass: E. Elgar, 1999.

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United States. National Aeronautics and Space Administration., ed. Some problems of the theory of bubble growth and condensation in bubble chambers. Washington, DC: National Aeronautics and Space Administration, 1988.

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10

Chen, Wen-Chin. Vapor bubble growth in heterogeneous boiling. 1995.

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Book chapters on the topic "Bubble growth"

1

Laine, M. "Hydrodynamics of Bubble Growth." In NATO ASI Series, 355–57. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4899-1304-3_37.

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Avdeev, Alexander A. "Thermally Controlled Bubble Growth." In Mathematical Engineering, 99–132. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29288-5_4.

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Kolev, Nikolay Ivanov. "Bubble growth in superheated liquid." In Multiphase Flow Dynamics 3, 35–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21372-4_2.

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Zudin, Yuri B. "Binary Schemes of Vapor Bubble Growth." In Non-equilibrium Evaporation and Condensation Processes, 157–84. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-13815-8_7.

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Zudin, Yuri B. "Binary Schemes of Vapor Bubble Growth." In Non-equilibrium Evaporation and Condensation Processes, 115–31. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67306-6_7.

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Ramesh, N. S., and Nelson Malwitz. "Bubble Growth Dynamics in Olefinic Foams." In ACS Symposium Series, 206–13. Washington, DC: American Chemical Society, 1997. http://dx.doi.org/10.1021/bk-1997-0669.ch014.

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Zudin, Yuri B. "Binary Schemes of Vapor Bubble Growth." In Non-equilibrium Evaporation and Condensation Processes, 209–27. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67553-0_7.

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Johansson, Johny K., and Masaaki Hirano. "Japanese Marketing in the Post-Bubble Era." In Restructuring Japanese Business for Growth, 243–57. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4593-4_14.

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Avdeev, Alexander A. "Bubble Growth, Condensation (Dissolution) in Turbulent Flows." In Mathematical Engineering, 133–80. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29288-5_5.

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Aggarwal, Raj. "Introduction: The Challenge of Post-Bubble Japanese Business Growth." In Restructuring Japanese Business for Growth, 1–8. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4593-4_1.

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Conference papers on the topic "Bubble growth"

1

Zheng, Qiang, Puzhen Gao, and Jian Hu. "Bubble Growth During Subcooled Forced Convective Flow Boiling." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-16200.

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The inception, growth and collapse of vapor bubbles were observed and measured by using visual method under subcooled flow nucleation. The test section was a single-side heated rectangular channel by the scale of 2×40×700mm and the working fluid was clean water. The working condition was set as: the inlet subcooling Δ Tin = 330 °C, the mass flux m = 694kg/(m2s), the heat flux q = 210kW/m2 and the absolute pressure p = 0.22MPa. A high speed camera was used to record the bubble behaviors at the speed of 5000fps (frame per second). The results showed that the bubble lifetime was from 0.4ms to 2.2ms and the fraction of bubble with short lifetime was bigger than that of long lifetime. The bubble’s average diameter showed a linear relationship with the lifetime and it was also found that the sliding bubble would enhance heat transfer.

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Hetsroni, G., and A. Mosyak. "Bubble Growth in Surfactant Solutions." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23091.

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The presence of surfactant additives in water was found to enhance significantly the boiling heat transfer. The objective of the present investigation was to compare the bubble growth in water to that of a surfactant solution with negligible environmental impact. The study was conducted to clarify the effect of the heat flux on the dynamics of bubble nucleation. The bubble growth under condition of pool boiling in water and surfactant solutions was studied using high speed video technique. The bubble generation was studied on a horizontal flat surface; where the natural roughness of the surface was used to produce the bubbles. At heat flux of q= 10 kW/m2 the life-time and the volume of bubble growth in surfactant solution did not differ significantly from those of water. The time behavior of the contact angle of bubble growing in surfactant solution is qualitatively similar to that of water. At a heat flux of q= 50 kW/m2, boiling in surfactant solution, when compared with that of pure water, was observed to be more vigorous. Surfactant promotes activation of nucleation sites; the bubbles appeared in a cluster mode; the life-time of each bubble in the cluster is shorter than that of a single water bubble. The detachment diameter of water bubble increases with increasing heat flux, whereas analysis of bubble growth in surfactant solution reveals the opposite effect: the detachment diameter of the bubble decreases with increasing heat flux. Natural convection boiling of water and surfactants at atmospheric pressure in narrow horizontal annular channels was studied experimentally in the range of Bond numbers Bo = 0.185–1.52. The flow pattern was visualized by high-speed video recording to identify the different regimes of boiling of water and surfactants. The channel length was 24mm and 36mm, the gap size was 0.45, 1.2, 2.2, and 3.7mm. The heat flux was in the range of 20–500 kW/m2, the concentration of surfactant solutions was varied from 10 to 600 ppm. For water boiling at Bond numbers Bo<1 the CHF in restricted space is lower than that in unconfined space. This effect increases with increasing the channel length. For water at Bond number Bo = 1.52, boiling can almost be considered as unconfined. Additive of surfactant led to enhancement of heat transfer compared to water boiling in the same gap size, however, this effect decreased with decreasing gap size. For the same gap size, CHF in surfactant solutions was significantly lower than that in water. Hysteresis was observed for boiling in degraded surfactant solutions.

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Wasfy, Hatem M., and Tamer M. Wasfy. "Zero Dimensional Model for the Growth of Heterogeneous Gas Bubbles." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15815.

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A zero dimensional energy based model for heterogeneous gas bubble growth from conical surface pits is presented. The spherical cap bubble growth is divided into 3 stages. In the first stage, the bubble is within the surface pit. In the second stage, the bubble is anchored to the circular opening of the surface cavity and the apparent bubble contact angle decreases while the bubble's contact radius remains the same. The third growth stage starts when the apparent contact angle becomes the same as the contact angle under the ambient conditions. In the third growth stage, the contact radius increases while the contact angle remains constant. The predicted bubble radius versus time since the detachment of the previous bubble was found to be in good agreement with published experimental data for CO2 bubbles growing in water. The long wait time observed in the experiments before a measurable bubble appears after the detachment of the previous bubble was also calculated.

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Gopalakrishna, Sridhar, and Noam Lior. "BUBBLE GROWTH IN FLASH EVAPORATION." In International Heat Transfer Conference 9. Connecticut: Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.3720.

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Shin, Min‐Su, Hy Trac, and Renyue Cen. "HII Bubble Growth during Reionization." In FIRST STARS III: First Stars II Conference. American Institute of Physics, 2008. http://dx.doi.org/10.1063/1.2905661.

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Dietzel, Dirk, Timon Hitz, Claus-Dieter Munz, and Andreas Kronenburg. "Expansion rates of bubble clusters in superheated liquids." In ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.4714.

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The present work analyses the growth of multiple bubbles in superheated liquid jets by means of direct numericalsimulations (DNS). A discontinuous Galerkin approach is used to solve the Euler equations and an adequate in- terface resolution is ensured by applying finite-volume sub-cells in cells with interfaces. An approximate Riemann solver has been adapted to account for evaporation and provides consistency of all conserved quantities across the interface. The setup mimics conditions typical for orbital manoeuvring systems when liquid oxygen (LOX) is injected into the combustion chamber prior to ignition. The liquid oxygen will then be in a superheated state, bubble nucleation will occur and the growth of the bubbles will determine the break-up of the liquid jet. The expansion rates of bubble groups under such conditions are not known and standard models rely on single bubble assumptions. This is a first DNS study on bubble-bubble interactions in flash boiling sprays and on the effects of these interactions on the growth rates of the individual bubbles. The present simulations resolve a small section of the jet close to the nozzle exit and the growth of bubble groups inside of the jet is analysed. The results suggest that an individual bubble within the group grows more slowly than conventional models for single bubble growth would predict. The reduction in bubble growth can amount to up to 30% and depends on the distances between the bubbles and the number of bubbles within the bubble group. In the present case, the volume expansion of the superheated liquiddecreases by approximately 50% if the distance between the bubbles is doubled.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4714

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Christopher, David M., and Xipeng Lin. "Bubble Growth During Nucleate Boiling in Microchannels." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22725.

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The flow and heat transfer in microchannels has been of great interest for some years now due to the significantly higher heat transfer coefficients useful for enhancing the heat transfer in very small but high heat flux applications such as electronics cooling. Nucleate boiling heat transfer in microchannels is also of great interest for generating even higher heat transfer rates; however, numerous studies have shown that the bubble formation immediately fills the entire microchannel with vapor significantly reducing the heat transfer since the bubble size is normally of the same size as the microchannel. The bubble growth process is very fast and difficult to study experimentally, even with high speed cameras. This study numerically analyzes the flow and bubble growth in a microchannel for various conditions by solving the Navier-Stokes equations with the VOF model with an analytical microlayer model to provide the large amount of vapor produced by the curved region of the microlayer. As each bubble forms, the large pressure drop around the bubble causes the bubble to quickly break away from the nucleation site and move quickly downstream. The bubbles are quite small with the size depending on the bulk flow velocity, subcooling and the heating rate. The numerical results compare quite well with preliminary experimental observations of bubble growth on a microheater embedded in the channel wall for FC-72 flowing in a microchannel.

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Duhar, G., and C. Colin. "Dynamics of Vapor Bubble Growth and Detachment in a Channel Flow." In ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/fedsm2006-98505.

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The aim of this study is to improve the knowledge of the dynamics of vapor bubbles growing on a wall in a shear flow. Vapor bubbles are created on a hot film probe flushed mounted in the lower wall of a horizontal channel. The film overheat temperature controlled by an anemometer is limited to 20°C to avoid the growth of multiple bubbles. The liquid flow in the channel measured by Particle Image Velocimetry is laminar or turbulent. Bubble growth and detachment in the channel flow are filmed with a high-speed video camera at 2000 frame/second. Image processing allows obtaining the temporal evolutions of the bubble kinematics characteristics: the equivalent radius and the position of the centre of gravity. These data are then used to calculate the bubble growth rate and the forces acting on the bubbles during their growth and after their detachment. After detachment, drag, buoyancy and added mass forces play a dominant role. From the investigation of the bubble trajectories after detachment, the drag coefficient can be determined. When the bubble is attached to the wall capillary forces are dominant. A predictive model for bubble radius at detachment is provided depending on the wall overheat.

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Pakleza, Jaroslaw, Marie-Christine Duluc, and Tomasz A. Kowalewski. "Experimental investigation of vapor bubble growth." In International Heat Transfer Conference 12. Connecticut: Begellhouse, 2002. http://dx.doi.org/10.1615/ihtc12.2580.

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Ramesh, N. S. "Bubble Growth in Thermoplastic Foam Extrusion." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0926.

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Abstract A condensed review will be presented regarding the bubble growth study. A modified model fitting to foam extrusion system will be discussed. The improved model focuses on the influence of blowing agent on bubble growth during thermoplastic foam extrusion. Extrusion has been conventionally used for producing low-density foam sheet and rods with physical blowing agents in the last decades. Foam nucleation, bubble growth, and cell coalescence are the three major events in the foaming process. Only the bubble growth study is addressed here. The bubble growth is influenced by the concentration-dependent blowing agent diffusion coefficient, transient cooling of the expanding foam, influence of blowing agent on polymer viscosity, and the escape of blowing agent from the surface of the foam. The blowing efficiency is affected by the escape of gas from the cells closer to the surface of the foam. Previous models in the literature do not consider these significant influences. A modified model will be presented accounting for those more subtle effects. In addition, a new experimental technique will be described to collect experimental bubble growth data. Predictions of the new model reasonably agree with the experimental data.

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Reports on the topic "Bubble growth"

1

Johnson, Bruce D., and Bernard P. Boudreau. Gas Bubble Growth in Muddy Sediments. Fort Belvoir, VA: Defense Technical Information Center, September 2000. http://dx.doi.org/10.21236/ada609860.

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Johnson, Bruce D., and Bernard P. Boudreau. Gas Bubble Growth in Muddy Sediments. Fort Belvoir, VA: Defense Technical Information Center, August 2001. http://dx.doi.org/10.21236/ada628165.

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Johnson, Bruce D., and Bernard P. Boudreau. Gas Bubble Growth In Muddy Sediments. Fort Belvoir, VA: Defense Technical Information Center, September 2002. http://dx.doi.org/10.21236/ada628879.

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Boudreau, Bernard P., and Bruce Johnson. Gas Bubble Growth in Muddy Sediments. Fort Belvoir, VA: Defense Technical Information Center, September 1999. http://dx.doi.org/10.21236/ada630884.

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Satik, C., X. Li, and Y. C. Yortsos. Scaling of bubble growth in a porous medium. Office of Scientific and Technical Information (OSTI), September 1994. http://dx.doi.org/10.2172/10184586.

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de Almeida, Valmor F., Sophie Blondel, David E. Bernholdt, and Brian D. Wirth. Cluster Dynamics Modeling with Bubble Nucleation, Growth and Coalescence. Office of Scientific and Technical Information (OSTI), June 2017. http://dx.doi.org/10.2172/1376497.

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Boudreau, Bernard P., and Bruce D. Johnson. The Mechanics of Bubble Growth and Rise in Sediments. Fort Belvoir, VA: Defense Technical Information Center, September 2007. http://dx.doi.org/10.21236/ada570939.

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Li, Xuehai, and Y. C. Yortsos. Visualization and simulation of bubble growth in pore networks. Office of Scientific and Technical Information (OSTI), March 1994. http://dx.doi.org/10.2172/10132010.

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Gardner, C. L., J. Glimm, O. McBryan, R. Menikoff, and D. Sharp. The Dynamics of Bubble Growth for Rayleigh-Taylor Unstable Interfaces. Fort Belvoir, VA: Defense Technical Information Center, May 1987. http://dx.doi.org/10.21236/ada184752.

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Cowgill, Donald F. Helium Bubble Growth and Retention Characteristics in Aging Palladium Tritide. Office of Scientific and Technical Information (OSTI), March 2020. http://dx.doi.org/10.2172/1608242.

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