Download or read book Bubble Dynamics Oscillations and Breakup Under Forced Vibration written by Mohammad Movassat and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bubble Dynamics and Shock Waves written by Can F. Delale and published by Springer. This book was released on 2014-11-09 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the interplay of bubble dynamics and shock waves, covering shock wave emission by laser generated bubbles, pulsating bubbles near boundaries, interaction of shock waves with bubble clouds, applications in shock wave lithotripsy, and more.

Download or read book Bubble Dynamics and Interface Phenomena written by John R. Blake and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains papers presented at the IUTAM Symposium on Bubble Dynamics and Interface Phenomena held at the University of Birmingham from 6-9 September 1993. In many respects it follows on a decade later from the very successful IUTAM Symposium held at CALTECH in June 1981 on the Mechanics and physics of bubbles in liquids which was organised by the late Milton Plesset and Leen van Wijngaarden. The intervening period has seen major development with both experiment and theory. On the experimental side there have been ad vances with very high speed photography and data recording that provide detailed information on fluid and interface motion. Major developments in both computer hardware and software have also led to extensive improvement in our understand ing of bubble and interface dynamics although development is still limited by the sheer complexity of the laminar and turbulent flow regimes often associated with bubbly flows. The symposium attracts wide and extensive interest from engineers, physical, chemical, biological and medical scientists and applied mathematicians. The sci entific committee sought to achieve a balance between theory and experiment over a range of fields in bubble dynamics and interface phenomena. It was our intention to emphasise both the breadth and recent developments in these various fields and to encourage cross-fertilisation of ideas on both experimental techniques and theo retical developments. The programme, and the proceedings recorded herein, cover bubble dynamics, sound and wave propagation, bubbles in flow, sonoluminescence, acoustic cavitation, underwater explosions, bursting bubbles and ESWL.

Download or read book Bubble Dynamics and Breakup in Straining Flows written by In Seok Kang and published by . This book was released on 1988 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bubble Dynamics in Stagnation Flow written by John E. Starrett and published by . This book was released on 1982 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bubble Motion Deformation and Breakup Final Report written by and published by . This book was released on 2003 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The last three projects considered various aspects of the behavior of bubbles in high Reynolds number flows. One common theme of these studies has been on the effects of surfactants on bubble motion.

Download or read book Bubbles Drops and Particles written by R. Clift and published by Courier Corporation. This book was released on 2013-04-22 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume offers a unified treatment and critical review of the literature related to the fluid dynamics, heat transfer, and mass transfer of single bubbles, drops, and particles. 1978 edition.

Download or read book Numerical Simulation of the Compressibility Effect on Bubble Dynamics written by Qun Wang and published by . This book was released on 1995 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bubble Motion Deformation and Breakup in Stirred Tanks written by Dongying Qian and published by . This book was released on 2003 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Oscillation and Collapse of a Cavitation Bubble in the Vicinity of a Two liquid Interface written by G. L. Chahine and published by . This book was released on 1979 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Copy of Interface Breakup Bubble Formation and Unexpected Bubble Motion in a Vibration Environment written by and published by . This book was released on 2011 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamics of the Breakup of an Underwater Air Bubble The Curvature Singularity and Water Fingers written by Lipeng Lai and published by . This book was released on 2012 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: The presence of slight azimuthal asymmetry in the initial shape of an underwater bubble entirely alters the final break-up dynamics. Vibrations in the cross-section shape of the bubble develop, grow relative to the average size of the bubble neck and bring about a coalescence mode of breakup in which distant regions along the air-water surface curve inwards and eventually collide with finite speed. Here we present boundary integral simulation results showing that these coalescence modes of breakups are interspersed with dynamics that give rise to sharp tips along the bubble surface. Our numerics show that when the initial condition is tuned towards some threshold value, the surface appears to evolve into a finite-time curvature singularity by developing sharp tips with infinite curvatures. However, starting with initial conditions at the threshold values, the surface evolution towards the curvature singularity is pre-empted by coalescence. We also show that the dynamics around the curvature singularity corresponds to a saddle-node evolution. In other words, an evolution towards a cross-section shape with sharp tips invariably later evolves away from it. The maximum curvature attained when the interface evolves towards the curvature singularity increases as the amplitude of the initial perturbation decreases. Taken together, the results suggest that the curvature singularity appears to be attained only in the limit that the initial perturbation amplitude approaches 0. For a phase space trajectory close to the curvature singularity, as the singularity is approached, the curvature of the sharp tip diverges approximately as (R-R c)-0.8, where R describes the average size of the horizontal cross-section of the bubble neck minimum and Rc corresponds to the onset of the singularity, and the velocity of the tip diverges approximately as (R-Rc) -0.4. In practice, these divergences imply that viscous drag and compressibility of the gas flow, two effects not included in our analysis, become significant as the interface evolves towards the curvature singularity.

Download or read book Bubble Wake Dynamics in Liquids and Liquid Solid Suspensions written by Liang-Shih Fan and published by Butterworth-Heinemann. This book was released on 1990 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to a fundamental understanding of the fluid dynamic nature of a bubble wake, more specifically the primary wake, in liquids and liquid-solid suspensions, an dto the role it plays in various important flow phenomena of multiphase systems. Examples of these phenomena are liquid/solids mixing, bubble coalescence and disintergration, particle entrainment to the freeboard, and bed contraction.

Download or read book Some Analytical Aspects of Bubble Dynamics written by Din-Yu Hsieh and published by . This book was released on 1965 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: A unified, systematic survey of the recent developments of bubble dynamics is presented with the emphasis on its analytical aspects. A general formulation of the problem is established first; then it is shown how simplifications may result from the spherical symmetry of the system and the assumption of uniform interior of the bubble. Two classes of problems of physical interest are treated subsequently; namely, the growth and collapse of a bubble, and the bubble in oscillation. In the first category, various aspects of the problem are investigated depending on whether the inertial, the thermal, or the diffusive effect is the dominating controlling factor of the motion. In the second category, the non-linear mechanical oscillations are discussed, as well as the linear oscillations with thermal and diffusive interactions. The paper concludes with a study of the stability of the spherical symmetry of the flow system. (Author).

Download or read book Micro bubble Dynamics in Turbulent Flow written by Zhentong Zhang (docteur en mécanique des fluides).) and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is devoted to the study of the motion of small bubbles in homogeneous isotropic turbulent flows. The work addresses several questions related to the statistical description of the hydrodynamic forces exerted on a bubble as well as the stochastic modeling of their high frequency fluctuations. First, we propose a model for the acceleration of micro-bubbles (smaller than the dissipative scale of the flow) subjected to the drag and the fluid inertia forces. This model, that depends on the Stokes number, the Reynolds number and the density ratio, reproduces the evolution of the acceleration variance as well as the relative importance and alignment of the two forces as observed from Direct Numerical Simulations (DNS). Second, based on the observation that acceleration statistics conditional to the local kinetic energy dissipation rate are invariant with the Stokes number and the dissipation rate, we propose a stochastic model for the instantaneous bubble acceleration vector accounting for the small-scale intermittency of the turbulent flows. The norm of the bubble acceleration is obtained by modeling the dissipation rate along the bubble trajectory from a log-normal stochastic process, whereas its orientation is given by two coupled random walk on a unit sphere in order to model the evolution of the joint orientation of the drag and inertia forces acting on the bubble. Furthermore, the proposed stochastic model for the bubble acceleration is used in the context of large eddy simulations (LES) of turbulent flows laden with small bubbles. It can effectively reproduce effect of turbulent motion at scales smaller than the mesh resolution by adding a random contribution depending on local average dissipation rate. Comparisons with DNS and standard LES, show that the proposed model improves significantly the statistics of the bubbly phase. Third, we extend the previous results in the case of bubbles with large Reynolds number by considering non-linear drag laws. We define an effective relaxation time based on the drag coefficient to characterize bubble motion (acceleration,velocity). Eventually we study the effect of buoyancy and lift force on the bubble dynamics, and analyze the reduction of the average rising velocity in turbulent flow compared to quiescent flows. It is observed that bubbles preferentially explore region having downward fluid acceleration which contributes through the inertia force to reduction of the rising velocity. In addition, as already observed, the lift force brings preferably bubbles into downstream fluid motion which also reduce their rising velocity.

Download or read book Cavitation and Bubble Dynamics written by Professor Department of Mechanical Engineering Christopher E Brennen and published by . This book was released on 2014-05-28 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cavitation and Bubble Dynamics deals with fundamental physical processes of bubble dynamics and cavitation for graduate students and researchers.

Download or read book Cloud Cavitation and Collective Bubble Dynamics written by Georges L. Chahine and published by . This book was released on 1986 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study described in this report extends our knowledge of single bubble dynamics to multibubble dynamics. Within the restriction of characteristic bubble size small compared to interbubble distance, the dynamics of a bubble cloud is investigated. Dynamic effects in absence as well as in presence of heat and mass transfer at the bubble wall are considered. The matched asymptotic expansion method is used and enables derivation of differential equations for the bubble shape components at the various orders of approximation. These were solved numerically and the pressure field was deduced. When, during a significant portion of the imposed pressure field history, the liquid is superheated or gas supersaturated, heat and mass transfer at the interface interfere with the dynamics of the bubble growth or oscillations. In that case, the dynamic equation of a bubble in the cloud is coupled to the heat or mass transfer equation by the value of the partial pressures of the liquid vapor and noncondensible gas inside the bubble which are then transfer dependent. This problem is solved when the liquid properties or conditions are such that the variation of the liquid temperature of the gas concentration in the liquid occurs primarily in a thin boundary layer at the bubble wall. In that case an integral equation relates bubble dynamics and heat or mass transfer at the bubble interface.