Open Channel Boundary Layer Relaxation Behind A Forward Facing Step at Low Reynolds Numbers  

Oleh:

Tachie, Mark F. ; Balachandar, Ram ; Bergstrom, D. J.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Fluids Engineering vol. 123 no. 3 (2001), page 539-544.
Topik: RELAXATION; boundary layer; relaxation; facing step; low reynolds number

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ89.2 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

This paper reports laser - Doppler anemometer measurements of mean velocity and turbulence statistics upstream and downstream of a 3 - mm forward facing step in a shallow open channel flow. The Reynolds numbers based on the momentum thickness (o) of the approaching upstream flow and step height (h) are in the range 1010 <= Re(o) <= 2240 and 960 <= Re(h) <= 1890, respectively. Measurements are obtained at 50 step heights upstream of the leading edge of the step and 1 <= x/h <= 162 downstream of the step. The results show that the overlap region develops more slowly than the inner and outer regions. The mean field recovers at x/h = 50. Distributions of the turbulence intensity tend to become self - similar for x/h > 100 but the profiles do not necessarily collapse onto the upstream profiles.

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