Bursting bubble in a viscoplastic medium. (10th September 2021)

• Record Type: Journal Article
• Authors: Sanjay, Vatsal; Lohse, Detlef; Jalaal, Maziyar
• Is Part Of: Journal of fluid mechanics. Volume 922(2021)
• Publication Date: 2021-09-10
• Subjects: complex fluids -- drops and bubbles -- interfacial flows (free surface); Fluid mechanics -- Periodicals; 532.005
• DOI: 10.1017/jfm.2021.489
• Languages: English
• ISSNs: 0022-1120

Abstract

Abstract: Abstract : When a rising bubble in a Newtonian liquid reaches the liquid–air interface, it can burst, leading to the formation of capillary waves and a jet on the surface. Here, we numerically study this phenomenon in a yield-stress fluid. We show how viscoplasticity controls the fate of these capillary waves and their interaction at the bottom of the cavity. Unlike Newtonian liquids, the free surface converges to a non-flat final equilibrium shape once the driving stresses inside the pool fall below the yield stress. Details of the dynamics, including flow energy budgets, are discussed. The work culminates in a regime map with four main regimes, all with different characteristic behaviours.