<p>Transverse jet from elevated source is found in various environmental and industrial field which include smoke exhausting from stack into atmosphere and sewage water disposal in deep-ocean. The investigation on continuous jet exiting in crossflow environment from circular stack and its wake at lower Reynolds number is carried out in water tunnel using flow visualization technique. Since the dye has been injected in both the crossflow and jet shear layer, the vortices formed in wake (both stack and jet wake) as well as in shear layer can be seen optically. The flow phenomena in such a flow configuration depends on three non-dimensional parameters: Reynolds number, velocity ratio and aspect ratio of the elevated round stack. The experiments have been performed for axisymmetric round jet of aspect ratio of 9.0 with the velocity ratio varying up to &nbsp;2.0 at a Reynolds number (calculated based on free stream crossflow velocity and jet external diameter) of 1000. Result shows the formation of (i) delayed regular clockwise vortices at the lee side of the jet shear layer (for velocity ratio less than 0.8), (ii) intermittent anticlockwise vortex at the upstream of jet shear layer along with clockwise vortices at the lee side of the jet shear layer that together forms mushroom vortices (for velocity ratio ranging from 0.9 to 1.0) (iii) regular mushroom vortices (for velocity ratio ranging from 1.08 to 1.9) are observed. The other vortex found is large recirculating region in the wake near the free end of the stack for velocity ratio less than 0.6. &nbsp;Above this velocity ratio the recirculating region behind the jet is observed which is bounded on sides of upright vortices.</p>

Large Scale Structures in Elevated Jet Normal to Crossflow

Paper Proceedings: https://asmedigitalcollection.asme.org/FEDSM/FEDSM2021/volume/85284

ASME 2021 Fluids Engineering Division Summer Meeting (FEDSM2021)

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