Abstract
Under specific conditions, a secondary flow can develop from a laminar horizontal buoyant jet released through a round nozzle. This secondary flow is a veil-shaped plane plume, which detaches from the main jet. The conditions for its apparition have been empirically determined and are available in the open literature. This paper aims to give theoretical basis to these conditions and to show some novel experimental observations and measurements on horizontal buoyant jets with secondary plume. One of the main results is the identification of the persistence of transversal velocity components in the release section of horizontal buoyant jets.
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