Natural Breakdown of Planar Jets

Abstract : The growth of planar jets is studied using the hydrogen bubble technique of flow visualization. Flows which are initially laminar and initially turbulent at the nozzle exit are considered. Generation of streaklines and timelines permit characterization of the process of vortex formation and coalescence. Both symmetrical and asymmetrical modes of vortex growth and coalescence, along with the resultant deformation of the jet core flow, are examined. Nascent and mature stage coalescence are defined and portrayed. Vortex axial transport velocity and frequency of formation of the vortices are evaluated for selected Reynolds numbers. (Author)