Abstract
Turbulence in boundary layers of superfluid $^{4}\mathrm{He}$ is studied using a vibrating wire. We developed a vortex filtering method for providing a superfluid practically free of remanent vortices in which a vibrating wire cannot generate turbulence. Based on this superfluid, we find that vortex lines are nucleated by cooling through the superfluid transition and remain forming bridges between the wire and a surrounding wall. Vibration of the wire causes instability of bridged vortex lines, generating turbulence. Dense vortex lines produce the nonlinear modes of wire vibration, which is very sensitive to temperature, disappearing above $60\phantom{\rule{0.3em}{0ex}}\mathrm{mK}$.
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