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W HEN a jet impinges on a sharp edge, the flow near the edge is excited and emits an edgetone. The edgetone phenomenon is observed in some instruments, such as pipe organs and flutes, and some researchers [1] have attempted to use its mechanism to enhance fluid mixing. The basic characteristics of the edgetone phenomenon have been investigated in previous studies [2–15]. Powell [4,6] constructed a feedback-loop equation predicting the peak frequency of the edgetone:
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Nonomura et al. (2010) studied this question.
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