Visualization of a locally-forced separated flow over a backward-facing step

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A laboratory water channel experiment was made of the separated flow over a backward-facing step. The flow was excited by a sinusoidally oscillating jet issuing from a separation line. The slit was connected to a cavity in which water was forced through a rigid pipe by a scotch-yoke system. The Reynolds number based on the step height (H) was fixed at Re-H = 1200. The forcing frequency was varied in the range 0.305 less than or equal to St(H) less than or equal to 0.955 at the forcing amplitude A(o) = 0.3. Time-averaged flow measurements were made by a LDV system, especially in the recirculating region behind the backward-facing step. To characterize the large-scale vortex evolution due to the local forcing, flow visualizations were performed by a dye tracer method with fluorescent ink. The vortex amalgamation process was captured at the effective forcing frequency (St(H) = 0.477) for laminar separation. This vortex merging process enhances flow mixing, which leads to the shortening of the reattachment length.
Publisher
Springer
Issue Date
1998-07
Language
English
Article Type
Article
Keywords

LAMINAR

Citation

EXPERIMENTS IN FLUIDS, v.25, no.2, pp.133 - 142

ISSN
0723-4864
URI
http://hdl.handle.net/10203/13640
Appears in Collection
ME-Journal Papers(저널논문)
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