Shape Effects on Resistance to Flow in Smooth Semi-Circular Channels

摘要

Information on the variation of boundary shear, friction factor and shape effects of flowing water in a semicircular open channel is lacking at the present stage. In pipes flowing partly full there is a pronounced discontinuity in the discharge curves for depths greater than half the diameter. A series of experiments with smooth semicircular channels was designed and carried out to study the effects of channel shape on resistance in the case of semicircular channels. The results of these experiments are of interest not only for the study of shape effects but also in providing a comparison between the resistance to flow in channels of other cross sectional shapes and in a semicircular one for which very little data is available in the literature.