ABSTRACT
Bubbles play an important role in many industrial and natural systems. A few examples include chemical reactors, mass transfer operations, froth flotation, and aeration systems. In some situations, buoyancy is the main cause of bubble motion. However, in lowgravity environments, more subtle effects such as surface tension gradients may be the primary mechanism for bubble motion. In turbulent flows, bubbles tend to follow the motion of the surrounding liquid. These examples may give some impression of the scope of the subject that we will attempt to address in this chapter.
