Abstract
The bubble motion behavior in viscoelastic fluid is very important the
in related gas-liquid processes. Thus, the emphasis of this review is to
discuss the three peculiar phenomena of bubbles rising in viscoelastic
fluids, i.e. the formation of the cusp, negative wake and velocity jump
discontinuity and to highlight the possible future directions of the
subject. The mechanism as well as influence factors on the three
peculiar phenomena is discussed in detail. The comparison of results has
shown that the change of bubble shape is mainly related to the
viscoelasticity of the fluid. However, the mechanism of two-dimensional
cusp, the tip-streaming, “blade-edge” tip, “fish-bone” tip and the
tail breaking into two different threads phenomena in some special
viscoelastic fluids is not very clear. For bubble velocity jump
discontinuity phenomenon, viscoelasticity is the most critical factor,
and the cusp of bubble, surface modification only played ancillary role.