Abstract:A small air bubble (radius $a$) is injected in water (kinematic viscosity $\nu$) in the vicinity (distance $r_0$) of a propeller (radius $r_p$, angular frequency $\omega$). We study experimentally and theoretically the conditions under which the bubble can be ‘captured’, i.e. deviated from its vertical trajectory (imposed by gravity $g$) and moved toward the centre of the propeller ($r\,{=}\,0$). We show that the capture frequency $\omega_{\hbox{\scriptsize\it capt}}$ follows the relationship \[\omega_{\hbox{\… Show more
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