Abstract
The numerical simulation using a boundary element method is presented for a gas bubble bursting at a free surface in a potential flow with a viscous fluid assumption. Systematic comparisons are given with experimental data on the first “jet drop” size in relation with the parent bubble size, and on the critical bubble radius above which no jet drop forms. The computations were made for different liquids. It is pointed out that an exact description of the jet formation and break up requires the complete Navier–Stokes equations only in the final phase of the evolution.
Highlights
The droplets formation that follows gas bubbles bursting at a free liquid surface plays an important role in mass transfer between phases in stratified two-phase flows
Numerical simulations of the break up stage of an isolated air bubble bursting at a free surface has been systematically performed for several pure Newtonian liquids and different parent bubble sizes, in order to compare numerical and experimental data
To study the jet drop formation, the final sequence of a bursting bubble process was modelled for several air/liquid couples, using a potential flow of a pure viscous fluid
Summary
The droplets formation that follows gas bubbles bursting at a free liquid surface plays an important role in mass transfer between phases in stratified two-phase flows. Many applications can be found in chemical and nuclear engineering, as well as in the geophysical field. Processes that involve a wide spectrum of bubble sizes, such as aeration, boiling, degassing, distillation, or evaporation are the most common examples. The considerable amount of salt transfer at sea surface is made through the aerosols ejected in the atmosphere. New health and environmental problems appear from the liquid droplets capacity of carrying pathogenic or radioactive substances collected on their surface. The bursting bubble process leads to the production of two types of droplets:
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