Effect of a standing baffle on the flow structure in a rectangular open channel

• Published in: Journal of hydraulic research Vol. 48; no. 3; pp. 400 - 404
• Main Authors: Jamshidnia, Hamidreza, Takeda, Yasushi, Firoozabadi, Bahar
• Format: Journal Article
• Language: English
• Published: Delft Taylor & Francis 01.06.2010; International Association for Hydraulic Research
• Subjects: Acoustic Doppler velocimetry; baffle; Baffles; Channels; Doppler; Doppler effect; Earth sciences; Earth, ocean, space; Energy dissipation; Exact sciences and technology; Fluid dynamics; Hydrology. Hydrogeology; Power spectra; spatial structure; temporal structure; Upstream; energy dissipation; spectra; spatial structure; channels; power spectra; temporal structure; baffle; velocity; vertical component; flow structures; Acoustic Doppler velocimetry
• ISSN: 0022-1686; 1814-2079
• DOI: 10.1080/00221681003726296

The effect of an intermediate standing baffle on the flow structure in a rectangular open channel has been investigated by a three-dimensional acoustic Doppler velocimeter. Investigation of time-averaged velocity profiles at different streamwise positions reveals that the approach flow is fully developed upstream of the baffle. By analysing the space-averaged power spectra of streamwise velocity, a peak structure was observed in the upstream baffle region. Downstream of the baffle this peak structure has been alleviated by the baffle. The same analysis for the vertical component indicates the existence of a peak structure both up- and downstream of the baffle. Consequently, a baffle affects the streamwise energy dissipation but not the vertical energy dissipation.