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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Instability of horizontal dense jets at low and moderate reynolds number
Instability of horizontal dense jets at low and moderate reynolds number
Laminar horizontal buoyant jet has been found to exhibit peculiar behaviour of unstable nature, e.g., bifurcation in the
form of a vertical secondary plume deriving from the primary jet, due to the unstable stratification on one interface
between the jet and the ambient fluid. However, the majority of the existing studies were focused on the low Reynolds
number regime (Re<500), whether the jet instability will persist into the transitional regime (500 open question. In this study, we explored the structure and stability, i.e., the tendency to bifurcate, of horizontal dense
jets at low and moderate Reynolds numbers in the laboratory. Planar Laser Induced Fluorescence (PLIF) was employed
for flow visualization. Three different flow patterns characterised with distinctive structures, namely, primary jet with
vertical secondary plume, primary jet with pseudo secondary jet, and quasi-turbulent horizontal buoyant jet, were
identified from longitudinal and cross-sectional images, together with their distribution on the Re-Fr parameter map. The
results provide new insight on the structure and stability of horizontal dense jets in the laminar and transitional regimes.
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 18/08/2015
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