Abstract
The available literature in the area of flow structures associated with impinging jet flows reveals that the large scale structures are an important mechanism in enhancing the transport phenomena between the jets and the impingement surface. In this study, naturally occurring structures in jet arrays are investigated in contrast to other studies which have examined externally forced single jets. In this experimental work a three-by-three submerged elliptic water jet array is used. The dynamics of the flow structures of the central jet of the array are investigated. The hydrodynamic conditions are limited to low Reynolds numbers (Re=300 and 1500) and impingement distances from one to five jet hydraulic diameters. Elliptic jet aspect ratios, for this study, are two and three. Particle Image Velocimetry (PFV) is used in the quantitative analysis of the large scale flow structures. The vorticity distribution in the jet and along the impingement surface is calculated and is found to be associated with the influence of the hydrodynamic conditions on the features of the flow structures. In addition, a modified circulation is used to quantify the flow structures strength.
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