Abstract
A micro-electromechanical resonator, consisting of a $$125 \times 125\,\upmu \hbox {m}^2$$ center plate suspended $$2\,\upmu \hbox {m}$$ above a substrate, was immersed in $$^4$$ He along with a quartz tuning fork. The tuning fork was placed 5 mm above the resonator and was used to generate turbulence. The damping of the resonator was investigated in the presence of turbulence generated by the tuning fork. We observe a velocity, $$v_c \simeq 5\,\hbox {mm}\,\hbox {s}^{-1}$$ , above which the damping on the resonator is drastically reduced for all tuning fork velocities studied. We attribute this change in damping to the shedding and capture of vortices.
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