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• W2183637864 abstract "The structure of a quasi-two-dimensional turbulen t jet in a narrow channel was investigated experimentally in this work. Study of spatio-tempor al flow structure was produced by the Time-resolved PIV technique. The 3D flow structure in the near field of the jet was studied by Tomographic PIV. Secondary flows in the bounded jet were obtained by Tomographic PIV for the first time. Jet flows are one of the most common forms of fluid dynamics in technological and natural systems. Recently, researchers are paying particula r attention to micro and mini jets in a confined space. This is due to general trends in the develop ment of small-scale technical systems. The jet in a narrow or slot channel has a number of features tha t significantly distinguish it from free jets and flows in channels. The presence of the bounding sur faces leads to different characteristic scales: small-scale three-dimensional flow with a maximum scale of the order of a channel depth and quasi-two-dimensional large-scale flow with the cha racteristic scales greater than the channel depth (Bilsky et al. 2007). The features of such flows al low investigating the properties of quasi-two- dimensional turbulence and the mechanisms of interaction between large-scale two-dimensional structures and small-scale three-dimensional turbul ence in a laboratory. Heskestad (1965) showed that the jets in confined c hannels cannot be described by two-dimensional flow equations. Secondary flows are formed near the bounding planes inside a jet shear layer which lead to a significant three-dimensional flow. Featu res of the bounded two-dimensional jets have been studied in Foss and Jones (1968). The authors showed that the flat bounded jet is not a superposition of two flows: a boundary layer and a two-dimensional jet. Based on measured velocity distributions in a cross section, the auth ors proposed a physical model of secondary flows. Later, in the paper Holdeman and Foss (1975) the au thors confirmed this effect by the results of hot-wire measurements and direct vorticity strength measurements by a small mechanical turbine. The model assumed that the secondary flows arise fr om the curvature of the vortex tube, which is formed on an edge of a nozzle. The vortex tube is s imilar to that formed at the end of the free rectangular jets, but the presence of bounding surf aces leads to the generation of longitudinal vorticity due to bending of the vortex tube near th e bounding surfaces. The reorientation of the vortex tube is directly related to its curvature, a rising due to the presence of slip at the wall and the velocity gradient near the wall. The authors showed that the secondary flows are completely determined by the longitudinal vorticity. A model b ased on the curvature of the vortex tube, also confirmed by other authors on the study of three-di mensional wall jet. However, Owczarek and Rockwell (1972) suggest another mechanism of secondary flows in a slot jet. Their model is based on the fact that the sources of secondary flows in the jet flow are rising out of the corners of a rectangular nozzle. The mechanism of secondary flows in rectangular channels, and in semi-infinite angles is well studied and confirmed in many experi mental works." @default.
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• W2183637864 date "2012-01-01" @default.
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• W2183637864 title "Tomographic PIV and Planar Time-resolved PIV Measurements in a Turbulent Slot Jet" @default.
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