Experiments on the transition to time-dependence in highly strained vortex flow inside a rectangular cavity
✍ Scribed by H. C. Kuhlmann; C. Blohm; S. Albensoeder; H. J. Rath
- Publisher
- John Wiley and Sons
- Year
- 2002
- Weight
- 118 KB
- Volume
- 1
- Category
- Article
- ISSN
- 1617-7061
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✦ Synopsis
Experiments on the transition to time-dependence in highly strained vortex flow inside a rectangular cavity
The flows in a two-sided lid-driven cavity with a cross-sectional aspect ratio Γ = 1.96 is experimentally investigated by laser-Doppler anemometry and by hot-film measurements. When the two facing walls move in opposite directions, a robust three-dimensional flow consisting of four cells arises for Reynolds numbers Re ≥ 275 as a result of the elliptic instability. The flow within these steady cells is measured to high precision. For Re > 825 the four cell flow becomes oscillatory. The oscillations are due to a standing wave with the same wavelength as the underlying cellular flow.