Abstract
Vortex breakdown is an abrupt change of flow structure that occurs in swirling flows. More than 3 decades of research in this area has not shed light upon this very basic fluid dynamical phenomenon. The mechanism that leads to vortex breakdown is very poorly understood despite numerous theoretical and experimental investigations. There is still a need for a coherent theory. In this paper these issues are considered in the form of a review of current literature on the phenomenon of vortex breakdown. Some existing criteria to predict the breakdown are presented.
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