Vortex pairing : the mechanism of turbulent mixing-layer growth at moderate Reynolds number

DOI Web Site 被引用文献10件

書誌事項

公開日
1974-04-03
権利情報
  • https://www.cambridge.org/core/terms
DOI
  • 10.1017/s0022112074001121
公開者
Cambridge University Press (CUP)

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説明

<jats:p>A mixing layer is formed by bringing two streams of water, moving at different velocities, together in a lucite-walled channel. The Reynolds number, based on the velocity difference and the thickness of the shear layer, varies from about 45, where the shear layer originates, to about 850 at a distance of 50 cm. Dye is injected between the two streams just before they are brought together, marking the vorticity-carrying fluid. Unstable waves grow, and fluid is observed to roll up into discrete two-dimensional vortical structures. These turbulent vortices interact by rolling around each other, and a single vortical structure, with approximately twice the spacing of the former vortices, is formed. This pairing process is observed to occur repeatedly, controlling the growth of the mixing layer. A simple model of the mixing layer contains, as the important elements controlling growth, the degree of non-uniformity in the vortex train and the ‘lumpiness’ of the vorticity field.</jats:p>

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