Abstract
We have performed an experimental campaign in the laboratory on the near field behavior of inclined negatively buoyant jets, issuing from a circular sharp-edged orifice, in order to investigate the symmetry properties of this phenomenon. The velocity measurements were obtained via a non intrusive image analysis technique, namely Feature Tracking Velocimetry. We present here both first and second order statistics, showing that the asymmetry of inclined negatively buoyant jets cannot be considered only a far field feature of this phenomenon, as it arises very close to the release point.
Highlights
2 ExperimentsThe laboratory section was set-up in order to reproduce a standard configuration of sea discharge, i.e. a portion of pipe, laid down on the sea floor, which discharges the effluent from the orifices along its wall (Wright et al 1982 [11], Avanzini et al 2006 [12])
In order to show the general behavior of an inclined negatively buoyant jets (INBJs), in Figure 1 the mean velocity field U, normalized by the maximum velocity at the outlet Umax, for an INBJ with Fr = 8, Re = 1000, and θ = 65° is shown
The INBJ is driven by two forces acting in different directions: momentum and buoyancy
Summary
The laboratory section was set-up in order to reproduce a standard configuration of sea discharge, i.e. a portion of pipe, laid down on the sea floor, which discharges the effluent from the orifices along its wall (Wright et al 1982 [11], Avanzini et al 2006 [12]). The adopted set-up, described in more details in Besalduch et al 2013 [3], consists in a 21 m long and 30 cm wide flume, with glass walls, filled with 46 cm of water where the discharge comes through a pipe, which is connected to a constant head tank, by means of a cylindrical vessel of 0.10 m diameter, with a sharp-edge orifice of diameter D = 4 mm, on its lateral wall. - to validate the samples via an algorithm based on a Gaussian filtering of first neighbors (defined by the Delaunay triangulation) As a consequence, this technique is able to perform measurements on a wide range of seeding density and in presence of non-homogeneous seedings, where the commonly adopted techniques can be affected by significant errors
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