Freezing-induced topological transition of double-emulsion

Meijer, Jochem G.; Kant, Pallav; Lohse, Detlef

doi:10.1039/d3sm01657a

Soft Matter

2024

DOI: 10.1039/d3sm01657a

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Freezing-induced topological transition of double-emulsion

Jochem G. Meijer,

Pallav Kant,

Detlef Lohse

Abstract: While freezing a double-emulsion, sudden topological transitions of compound droplets are observed caused by partial solidification, triggering liquid-to-vapor phase transitions.

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Cited by 2 publications

References 34 publications

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Enhanced bubble growth near an advancing solidification front

Meijer,

Rocha,

Linnenbank

et al. 2024

J. Fluid Mech.

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Frozen water might appear opaque since gas bubbles can get trapped in the ice during the freezing process. They nucleate and then grow near the advancing solidification front, due to the formation of a gas supersaturation region in its vicinity. A delicate interplay between the rate of mass transfer and the rate of freezing dictates the final shapes and sizes of the entrapped gas bubbles. In this work, we experimentally and numerically investigate the initial growth of such gas bubbles that nucleate and grow near the advancing ice front. We show that the initial growth of these bubbles is governed by diffusion and is enhanced due to a combination of the presence of the background gas concentration gradient and the motion of the approaching front. Additionally, we recast the problem into that of mass transfer to a moving spherical object in a homogeneous concentration field, finding good agreement between our experimental data and the existing scaling relations for that latter problem. Lastly, we address how fluid flow around the bubble might further affect this growth and qualitatively explore this through numerical simulations.

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Enhanced bubble growth near an advancing solidification front

Meijer,

Rocha,

Linnenbank

et al. 2024

J. Fluid Mech.

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Deforming Ice with Drops

van Buuren,

Kant,

Meijer

et al. 2024

Phys. Rev. Lett.

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A uniform solidification front undergoes nontrivial deformations when encountering an insoluble dispersed particle in a melt. For solid particles, the overall deformation characteristics are primarily dictated by heat transfer between the particle and the surrounding, remaining unaffected by the rate of approach of the solidification front. In this Letter we show that, conversely, when interacting with a droplet or a bubble, the deformation behavior exhibits entirely different and unexpected behavior. It arises from an interfacial dynamics which is specific to particles with free interfaces, namely, thermal Marangoni forces. Our Letter employs a combination of experiments, theory, and numerical simulations to investigate the interaction between the droplet and the freezing front and unveils its surprising behavior. In particular, we quantitatively understand the dependence of the front deformation Δ on the front propagation velocity, set by the strength of the applied thermal gradient, which, for larger front velocities (larger applied thermal gradients), can even revert from attraction (Δ<0) to repulsion (Δ>0). Published by the American Physical Society 2024

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Freezing-induced topological transition of double-emulsion

Abstract: While freezing a double-emulsion, sudden topological transitions of compound droplets are observed caused by partial solidification, triggering liquid-to-vapor phase transitions.

Cited by 2 publications

References 34 publications

Enhanced bubble growth near an advancing solidification front

Enhanced bubble growth near an advancing solidification front

Deforming Ice with Drops

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