Analysis of the Split Width Ratio and Vortex Tube Deployment Angle Effect on Trap Efficiency and Flow Losses in Meandered Rivers
M.R.Rafiee, M. H. Mohebi, A. Moradi, R.Aghamajidi
Providing a condition that supplies maximum impoundment along with minimum sediment is one of the significant issues in designing basins to prevent the blockage of the basin, which occurs due to sediment accumulation. Vortex tube is one of the bed sediments substrate separator which is constructed at the beginning of the transmission channels. This sediment can be used permanently and is economical due to small dimensions and easy installation. The optimal design of the vortex tube requires finding dimensions that can increase the trap efficiency. The 180-degrees experimental model with a torsional radius (R / B = 3) of 3 and a vortex tube deployment angle of 115 degrees with a 45-degree of impoundment angle to evaluate the effect of split width ratio and the vortex tube deployment angle on the sediment trap efficiency and flow losses. The findings of the current research indicate that the maximum efficiency of sediment trap is different depending on the angle of the vortex tube deployment angle and occurs in different Froude numbers, however, the angle of 60 degrees generally has the highest sediment trap efficiency between the test angles (60, 70, 80 and 90 degrees). Water losses also decrease with the increase in Froude numbers so that the maximum water loss is about 30% in the Froude number of 0.5 and the lowest is about 5.4% in the Froude number of 1.2.