Transition from laminar to turbulent drag in flow due to a vibrating quartz fork.

@article{Blakov2007TransitionFL,
  title={Transition from laminar to turbulent drag in flow due to a vibrating quartz fork.},
  author={Martina Bla{\vz}kov{\'a} and David Schmoranzer and Ladislav Skrbek},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  year={2007},
  volume={75 2 Pt 2},
  pages={025302}
}
Flow due to a commercially available vibrating quartz fork is studied in gaseous helium, He I and He II, over a wide range of temperatures and pressures. On increasing the driving force applied to the fork, the drag changes in character from laminar (characterized by a linear drive vs velocity dependence) to turbulent (characterized by a quadratic drive vs velocity dependence). We characterize this transition by a critical Reynolds number Recrdelta=Ucrdelta/nu, where Ucr is the critical… CONTINUE READING

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