Figure 5.

(a) Equivalent diameter D_p as a function of phase angle for one cycle. (b) Equivalent diameter D_p as a function of phase angle for one cycle for nonflapping cases (1, 2, 4, and 6) for positive (+y) and negative (−y) nozzle cross sections. (c) Equivalent diameter D_p as a function of phase angle for one cycle for flapping cases (3 and 5) for positive (+y) and negative (−y) nozzle cross sections. (d) High-speed images of the motion of flexible tube at different instances of the microphone cycle for case 2.