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Author(s): Adélio Cavadas
Fernando Tavares de Pinho
João Campos
Title: Flow field in a liquid impinging jets confined by slopping plane walls
Issue Date: 2006
Abstract: An experimental investigation was carried out to characterize the flow field in a liquid impingingjet confined by slopping plane walls and emanating from a rectangular duct. The fluids are Newtonianflowing in the laminar (Re= 135 and 276) and turbulent regimes (Re=13,750) and the two-dimensionalrectangular cell has an aspect-ratio equal to 13. The fully-developed rectangular jet impinging the flat surface(plate) is confined by two slopping plane walls, each one making an angle of 12° relative to the plate. Thepresence of the impact plate is felt upstream at y/H= -0.2 in the laminar regime and at y/H= -0.4 in theturbulent regime. The results show that the flow is symmetric relative to the x-y and x-z center planes. Nearthe plane slopping wall there is separated flow for Reynolds numbers in excess of 208, as was observed invisualization studies. For Re= 275 this small separated flow zone has a normalized length, xR/H = 0.25,whereas for turbulent flow xR/H is equal to 0.9. In the turbulent flow regime turbulence is very high at the jetimpact region due to strong fluid deceleration, but the maximum turbulence is observed in the shear layerformed between the jet along the impinging wall and the separated flow region on the sloping wall. We alsoreport three-dimensional effects due to finite slenderness of the flow geometry.
Source: 13th International Symposium on Applications of Laser Techniques to fluid Mechanics
Document Type: Artigo em Livro de Atas de Conferência Internacional
Rights: openAccess
Appears in Collections:FEUP - Artigo em Livro de Atas de Conferência Internacional

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