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