Abstract
The roughness elements are efficient tools to control the features of the hydraulic jump in the rectangular stilling basins. The present study suggests the use of modified elements to control the features of the free jump. The proposed tool is an incomplete circular pile. The use of piles in a one row with the different setup has been investigated. The measurements showed that the case of piles with the comparative summation areas A/∆=6.72 and the comparative distances between piles X/H1 =0.0 reduced the comparative height and length of the free jump by 11% and 24.6%, respectively. The paper detected the necessary helpful statistical formulas for the phenomenon.
Highlights
The hydraulic jump features were examined using the lab measures over the years by many investigators (Aal et al, 2013; Abdel-aal et al, 2014; Abdel-Aal et al, 2016; Mohamed, 2010; Nassar, 2014; Parsamehr et al, 2012)
E1 comparative lost energy through the free H. jump; E1 is the total energy at the start of the free H. jump; F is the factor defined by Froude, F=√vgH1 1; v1 is the average flow velocity at the start of the free H. jump; A is the summation areas of the incomplete circular piles es; ∆ = H12; X is the length between two consecutive incomplete circular piles
The 1st phase researches for the effect of the comparative summation areas of the incomplete circular piles A/ on the features of the free H. jump
Summary
The hydraulic jump features were examined using the lab measures over the years by many investigators (Aal et al, 2013; Abdel-aal et al, 2014; Abdel-Aal et al, 2016; Mohamed, 2010; Nassar, 2014; Parsamehr et al, 2012). A scientific paper discussed the use of the lozenge shape as a roughness element on the features of the jump (Parsamehr et al, 2017). A scientific paper discussed the consequences of the use of the curved steel sheets elements on the features of the jump (Habib and Nassar, 2013). The proposed elements reduced the jump depth and length by the percent of 15.5 and 19, respectively. It increased the lost energy of 17%. A scientific paper discussed theoretically the features of the hydraulic jump in the sloped rectangular basin including roughness elements (Alhamid and Negm, 1996).
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