Flow visualization and mass transfer (naphthalene sublimation) experiments wereudperformed on acoustically excited annular air jet with diameter ratio Di/Do=0.95. Twouddifferent regimes of the time-mean flow field were found, differing in the size of theudcentral recirculation zone, with either the single stagnation point or the stagnationudcircle. The switching between the two regimes is accomplished by acoustic excitation,udunder identical geometry conditions. An effective stabilization of the largeudrecirculation zone, as well as remarkable augmentation of average heat/mass transferudby 23%, have been achieved at the excitation Strouhal number Sh=0.94.
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机译：在直径比Di / Do = 0.95的声激发环形空气射流上进行了流动可视化和传质（萘升华）实验。发现了两种平均时间流场，其中心再循环区的大小不同，具有单个停滞点或停滞 ucircle。在相同的几何条件下，通过声激发来实现两种状态之间的切换。在激发斯特劳哈尔数Sh = 0.94时，已经实现了大的再循环区域的有效稳定，并且平均热/质量传递显着提高了23％。
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