Abstract
The development of three-dimensional turbulent wall jets emanating from long channels with outlet cross-sectional aspect ratios from 1 to 8 was investigated by measuring the mean and turbulent flowfields using hot-wire anemometry. The turbulent velocity profiles indicate that the core of the jet behaves like a two-dimensional wall jet before the interaction of the lateral shear layers. Contours of the full flowfield indicate that the turbulent mechanism that causes the lateral growth of the three-dimensional wall jets is located in the lateral shear layers near the wall. Increasing the outlet aspect ratio separates the lateral shear layers, causing a wider core region of two-dimensional wall-jet development that, in turn, delays the onset of far-field three-dimensional wall-jet development. The development of the different aspect-ratio wall jets collapsed onto a single curve when the streamwise coordinate was normalized by the square root of the channel cross-sectional area and the vertical and lateral jet half-widths were normalized by the height and width of the channel, respectively.
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