Author(s): S. K. Lama; K. Keita; K. Mikio
Linked Author(s):
Keywords: Flow separations; Surface dividing streamline; Bottom dividing streamline; Water surface profile; Discharge division; Flow contraction; Surface of discontinuity
Abstract: Flow characteristics of the dividing flow at open channel junction depend upon the incoming flow condition, backwater effect of the main and the branch channels, aspect ratio d1/b3 (defined as ratio of depth of incoming flow to the width of the branch channel) and junction intersection angles etc. Division of flow discharges at the 30o intersection channels with free flow condition at the branch channel (i.e. no flow control provision at the end of the branch channel) were found to be primarily depending upon the incoming Froude Number (F1) in which depth ratio of branch to main channel (d3/d1) has found to have less effect. The width of the bottom dividing streamline, which is the important characteristics of the dividing flow at the junction, was found to be depending on the F1 and decreased with the increase of F1. Various types of separation zones were observed at the junction depending upon the change of the flow condition. For junction flow division with 30o intersection having free flow condition at branch channel and width ratios of main to branch channel greater than 4:1, water surface profiles and flow characteristics were found to be similar to each other allowing modeling of such 30o junction flow study.
Year: 2003