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|Title:||Vortex breakdown in an unconfined vortical flow||Authors:||Khoo, B.C.
|Issue Date:||Feb-1997||Citation:||Khoo, B.C.,Yeo, K.S.,Lim, D.F.,He, X. (1997-02). Vortex breakdown in an unconfined vortical flow. Experimental Thermal and Fluid Science 14 (2) : 131-148. ScholarBank@NUS Repository.||Abstract:||Flow visualization experiments were conducted on an unconfined vortex formed on a stationary impermeable base. At the low circulation range, all seven modes of vortex breakdown previously documented for a confined flow could be observed, in spite of the vast differences in the two sets of apparatus. The unconfined flow also revealed the existence of a conical breakdown. This occurrence was first reported by the authors (5th ISOPE Conf. 11-15 June 1995) and has since been recently observed under confined swirling flows. It is characterized by a conical breakdown envelope and occurs at the high swirl regions. At the higher circulation range, the vortex structure erupted from the base into a large-scale turbulent flow. Results are presented on a chart using parameters related to the intrinsic flow properties of the vortical flow - circulation, extent of vortex stretching, and core size. © Elsevier Science Inc., 1997.||Source Title:||Experimental Thermal and Fluid Science||URI:||http://scholarbank.nus.edu.sg/handle/10635/58913||ISSN:||08941777|
|Appears in Collections:||Staff Publications|
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