Author(s): Y. Yasuda; H. Chanson
Linked Author(s):
Keywords: Ir-water flow; Intrusive measurements; Velocity distribution; Turbulence; Bubble sizes; Cluster structure
Abstract: Stepped chute flows are characterised by intense turbulence and strong flow aeration (Fig. 1), but most studies did not investigate the turbulence characteristics. Detailed air-water flow properties were measured in skimming flow on a stepped chute (θ = 16o, h =0.05 m). Longitudinal oscillations of depth-averaged flow properties were observed with a wave length of about two step cavity lengths. High turbulence levels were recorded downstream of inception, and the data were correlated to the air-water interface. In the bubbly flow region (C < 0.3), bubble size distributions demonstrated a broad range of entrained bubbles, with a fair proportion associated with a bubble cluster structure. Overall the results emphasise the complexity of air-water skimming flows down stepped chutes.
Year: 2003