Hydraulic jump is one of the most important phenomena in a rapid changing flow. It occurs when flow change from supercritical into subcritical and there is an increase in the depth over a small distance. In the present study, the characteristics of hydraulic jumps in contractions and expansions with curved walls were investigated for five Froude numbers in the range 5.8<Fr1<9.1. The values of the depths and instantaneous velocities were measured at different locations in the hydraulic jumps throughout the transition. The results of the study indicated that energy dissipation in the contraction compared with the expansion decreased on average by 8.74%. On the other hand, the values of the second depth and the jump length increased by 1.8 and 2.5 cm in average. Also, the findings of the study revealed that as the longitudinal distance from the beginning of jump increased, the maximum amount of Reynolds intensions increased in the contraction and decreased in the expansion.
[1]
Zhilin Sun,et al.
Effect of prismatic elements as bed roughness on hydraulic jump characteristics
,
2012
.
[2]
G. Ezizah,et al.
Hydraulic Jumps on New Roughened Beds
,
2012
.
[3]
Stefano Pagliara,et al.
Hydraulic jump on rough bed of stream rehabilitation structures
,
2008
.
[4]
R. Narayanan,et al.
Gradually expanding hydraulic jump in a trapezoidal channel
,
2007
.
[5]
John A. McCorquodale,et al.
Radial Hydraulic Jump
,
1979
.
[6]
Farzin Salmasi,et al.
Numerical Study of Hydraulic Jump on Rough Beds Stilling Basins
,
2013
.
[7]
A. Tabebordbar,et al.
Hydraulic jumps on adverse slope in two cases of rough and smooth bed.
,
2010
.