Abstract
Swirling jets produced using inlet swirlers are often used to increase the heat or mass diffusion rates in heat exchangers or reactors, separation of smoke and dust suspended in the air in ventilation ducts etc. The aim of this work is to validate a CFD model through streak-line comparison and to define the fully laminar and turbulent regime for decaying vortex flow produced using a set of axial swirlers in an annular pipe. Flow visualization was conducted using fluorescent dye to visualize on eddy formation along the pipe. Decaying vortex flow was produced using static axial swirlers fitted at the inlet of the annular pipe. In this study, three different swirl angles were investigated: 30°, 45° and 60°. In addition, the Reynolds number (Re) was varied from 10 to 1800. Results shows that the flow regimes for decaying vortex flow in annuli can be defined with reference to axial annular pipe flow.
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