Abstract
Studies of secondary flow in vertically standing rectangular-sectioned, strongly curved ducts whose radius of curvature 0.6 and 1.5 wer made.
The duct is 5 cm breadth by 6 cm thickness with 108 cm long upstream and downstream straight duct attached at both ends of the bend, the former is riser and the latter downcomer.
Reynolds number for the test considered from 260 to 2740 in this studies.
Mean longitudinal velocity contours obtained by laser-Doppler velocimetry, pressure distribution along the inner and outer walls, and still and cine photography recordings of flow-streak were made.
In comparison with two curvature, there are striking discrepancies in flow patterns between them, found in these studies.
