• A KARTHEESWARAN

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    • Visualisation studies on plane jets at low Reynolds numbers

      A KARTHEESWARAN T J S JOTHI RAHUL S ARACKAL

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      Flow visualisation of plane jets in the Reynolds number (Re) range of 90 to 750 is carried out experimentally, considering water as fluid. A conventional rectangular nozzle with the exit dimensions of 20 mm 9 2 mm is used. Various visualisation experiments are carried out using a colour dye mixed or injected with thejet flow. Images are processed using image processing software to estimate the characteristics of the jets. Besides, to assess the growth of the shear layer in free jets, a nozzle with an extension of its base wall by 5 mm is considered. The resulting images indicate that the mean spread rate of a turbulent plane jet is around 0.152. In the case of laminar jets, a vortex street with large size vortices is observed at lower Reynolds numbers. The Strouhal number of the vortices formed in the laminar jet is observed to increase with an increase in theReynolds number. The amplitude of the oscillations of a laminar jet column at Re & 90 is observed to increase with an increase in the axial distance. The dissipation and spread rates are lower for smaller Reynolds number laminar jet. The flow emerging from a nozzle with an extended base-wall is found to be asymmetric along its nozzle centreline, attributed to the delay in the shear layer formation at the wall side

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