Abstract
We experimentally investigate the vortex breakdown (VB) of swirling jet with density difference in inverted gravity (+1g). The trends of the changes in the jet half-angle and stagnation point height are investigated in detail for the stable VB. Our physical model derived by considering the momentum balance in a swirling flow is adopted to understand the mechanism of the change in the stagnation point height in +1g with increasing swirl number of the inner jet and Reynolds number of the outer jet.
