Both the estimation of the time that small heavy particles remain inside a 3D vortex and the estimation of the average settling\nvelocity of those particles are some important features in many practical situations. Previous works focused on the case of a\nhorizontal 2D vortex. In this paper, we simulate the dynamics of heavy particles initially situated inside a three-dimensional vortex\nobtaining a formula for their average settling velocity. In a previous paper we obtained the trajectories of the particles and a formula\nthat provides the time that they need to escape,
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