Positively buoyant jet in still air. Smoke flow visualization. See also visualizations of cigarette smoke.
Reference: Perry, A.E. & Lim, T.T. (1978) Coherent structures in coflowing jets and wakes, JOURNAL OF FLUID MECHANICS, Vol 88 , 451 - 463
Visit T. T. Lim's web site at http://serve.me.nus.edu.sg/limtt/.
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