Dynamics of bubbles across scales
Doctoral thesis, 2023
Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics
Laser-induced vapour bubble as a means for crystal nucleation in supersaturated solutions - Formulation of a numerical framework
Experimental and Computational Multiphase Flow,; Vol. 1(2019)
Numerical Frameworks for Laser-Induced Cavitation: Is Interface Supersaturation a Plausible Primary Nucleation Mechanism?
Crystal Growth & Design,; Vol. 20(2020)p. 7276-7290
A multiscale methodology for small-scale bubble dynamics in turbulence
International Journal of Multiphase Flow,; Vol. 150(2022)
The lift force on deformable and freely moving bubbles in linear shear flows
Journal of Fluid Mechanics,; Vol. 952(2022)
N. Hidman, H. Ström, S. Sasic, and G. Sardina. Assessing passive scalar dynamics in bubble-induced turbulence using DNS.
exchangers, froth flotation tanks and atmosphere-ocean exchanges. This type of multiphase flow is
characterised by good heat and mass transfer properties without the need for mechanical mixing and
therefore requires lower operating and maintenance costs. To understand and design efficient
applications, it is essential that we can accurately predict the bubbly flow dynamics. However,
numerical predictions of bubbly flows are very challenging, mainly because of the wide range of
coupled phenomena where, for example, the motion of individual bubbles interacts with the large
scale motion of the entire bubbly flow.
In this thesis, we develop numerical frameworks to study bubbly flow phenomena across a wide
range of relevant length scales. The frameworks are used to study the growth of micrometer-sized
vapour bubbles, the forces acting on individual rising bubbles and the mixing properties of turbulent
bubbly flows relevant in industrial applications. Our findings increase the current knowledge of
these bubble phenomena and facilitate the development of improved numerical predictions. The
developed numerical frameworks are useful for studying many other relevant bubble phenomena
such as cavitation/boiling, bubble dynamics in turbulence and heat transfer in bubbly flows.
Possible applications and recommendations for future work are also discussed.
Fluid Mechanics and Acoustics
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 5240
EC-salen, Hörsalsvägen 11
Opponent: Prof. Stéphane Zaleski, Sorbonne Université & CNRS, France