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Annular impinging jet with recirculation zone expanded by acoustic excitation

By Z. Trávnícek and V. Tesar


Flow visualization and mass transfer (naphthalene sublimation) experiments were\ud performed on acoustically excited annular air jet with diameter ratio Di/Do=0.95. Two\ud different regimes of the time-mean flow field were found, differing in the size of the\ud central recirculation zone, with either the single stagnation point or the stagnation\ud circle. The switching between the two regimes is accomplished by acoustic excitation,\ud under identical geometry conditions. An effective stabilization of the large\ud recirculation zone, as well as remarkable augmentation of average heat/mass transfer\ud by 23%, have been achieved at the excitation Strouhal number Sh=0.94

Year: 2004
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