Dynamics of Bubbly Flows

Invited Lecturers

Dieter Bothe (Technische Universität Darmstadt, Germany)
5 lectures on: Modeling and Direct Numerical Simulation of Bubbles: (1) continuum thermodynamics of two-phase systems employing sharp-interface approach; (2) discussion of various numerical methods for DNS, with emphasis on VOF; (3) applications to bubble dynamics and multi physics with emphasis on mass transfer.

Jacques Magnaudet (Université de Toulouse, France)
5 lectures on: The physical origin of the hydrodynamic forces on bubbles is discussed: added-mass, shear-induced lift, viscous drag, history drag and wall effect. Theoretical or semi-empirical expressions are given for all Reynolds numbers. Their predictions are compared with available data in practical situations.

Andrea Prosperetti (Johns Hopkins University, Baltimore, MD, USA)
5 lectures on: Pressure waves in bubbly flows: (1) Fundamental of bubble dynamics; (2) Simple averaging approaches for linear waves; (3) Nonlinear waves and shocks; (4) Ensemble averaging tools; (5) Derivation of averaged equations by ensemble averaging.

Frédéric Risso (CNRS and Université de Toulouse, France)
5 lectures on: Statistical and spectral features of the liquid agitation induced by moving bubbles are described. Underlying physical mechanisms are explained by distinguishing localized spatial disturbances from collective flow instability. Practical consequences on mixing and interfacial transfer are presented.

Chao Sun (University of Twente, The Netherlands)
5 lectures on: Advanced experimental techniques for bubbly flows are presented and discussed: high-speed imaging, flow visualizations, phase-sensitive hot-film anemometry, laser-Doppler anemometry, particle image velocimetry and tracking. A particular emphasis is put on 3D characterization.

Shu Takagi (The University of Tokyo, Japan)
5 lectures on: Engineering and medical applications of bubbly flows are discussed with an emphasis on fundamental physics: water purification using microbubbles; skin friction reduction for ship propulsion by bubble injection; microbubbles as contrast agent of ultrasound diagnosis with application to the therapy.

Roberto Zenit (Universidad Nacional Autónoma de México, Mexico)
5 lectures on: Starting from fundamental rheological concepts, the influence of viscoelasticity and shear-dependent viscosity on the motion of single bubbles and pair interactions are analyzed. Then, the original key features of non-Newtonian bubbly liquids, such as cluster formations, are discussed.

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