Transition from laminar to turbulent drag in flow due to a vibrating quartz fork
- Joint Low Temperature Laboratory, Institute of Physics ASCR and Faculty of Mathematics and Physics, Charles University, V Holesovickach 2, 180 00 Prague (Czech Republic)
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 Re{sub cr}{sup {delta}}=U{sub cr}{delta}/{nu}, where U{sub cr} is the critical velocity, {nu} stands for the kinematic viscosity, {delta}={radical}(2{nu}/{omega}) is the viscous penetration depth, and {omega} is the angular frequency of oscillations. We have experimentally verified that the corresponding scaling U{sub cr}{proportional_to}{radical}({nu}{omega}) holds in a classical viscous fluid over two decades of {nu}.
- OSTI ID:
- 21072380
- Journal Information:
- Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, Vol. 75, Issue 2; Other Information: DOI: 10.1103/PhysRevE.75.025302; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-651X
- Country of Publication:
- United States
- Language:
- English
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