Turbulent breakup in emulsification devices is a dynamic process. Small viscous drops undergo a sequence of oscillations before entering the monotonic deformation phase leading to breakup. The turbulence-interface interactions prior to reaching critical deformation are therefore essential for understanding and modeling breakup. This contribution uses numerical experiments to characterize the critically deformed state (defined as a state from which breakup will follow deterministically, even if no further external stresses would act on the drop). Critical deformation does not coincide with a threshold maximum surface area, as previously suggested. A drop is critically deformed when a neck has formed locally with a curvature such that the Laplace pressure exceeds that of the smallest of the bulbs connected by the neck. This corresponds to a destabilizing internal flow, further thinning the neck. Assuming that the deformation leads to two spherical bulbs linked by a cylindrical neck, the critical deformation is achieved when the neck diameter becomes smaller than the radius of the smallest bulb. The role of emulsifiers is also discussed.

A criterion for when an emulsion drop undergoing turbulent deformation has reached a critically deformed state / Hakansson, A; Crialesi-Esposito, M; Nilsson, L; Brandt, L. - In: COLLOIDS AND SURFACES. A, PHYSICOCHEMICAL AND ENGINEERING ASPECTS. - ISSN 0927-7757. - 648:(2022), pp. 129213-129213. [10.1016/j.colsurfa.2022.129213]

A criterion for when an emulsion drop undergoing turbulent deformation has reached a critically deformed state

Crialesi-Esposito, M;
2022

Abstract

Turbulent breakup in emulsification devices is a dynamic process. Small viscous drops undergo a sequence of oscillations before entering the monotonic deformation phase leading to breakup. The turbulence-interface interactions prior to reaching critical deformation are therefore essential for understanding and modeling breakup. This contribution uses numerical experiments to characterize the critically deformed state (defined as a state from which breakup will follow deterministically, even if no further external stresses would act on the drop). Critical deformation does not coincide with a threshold maximum surface area, as previously suggested. A drop is critically deformed when a neck has formed locally with a curvature such that the Laplace pressure exceeds that of the smallest of the bulbs connected by the neck. This corresponds to a destabilizing internal flow, further thinning the neck. Assuming that the deformation leads to two spherical bulbs linked by a cylindrical neck, the critical deformation is achieved when the neck diameter becomes smaller than the radius of the smallest bulb. The role of emulsifiers is also discussed.
2022
648
129213
129213
A criterion for when an emulsion drop undergoing turbulent deformation has reached a critically deformed state / Hakansson, A; Crialesi-Esposito, M; Nilsson, L; Brandt, L. - In: COLLOIDS AND SURFACES. A, PHYSICOCHEMICAL AND ENGINEERING ASPECTS. - ISSN 0927-7757. - 648:(2022), pp. 129213-129213. [10.1016/j.colsurfa.2022.129213]
Hakansson, A; Crialesi-Esposito, M; Nilsson, L; Brandt, L
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1301451
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