Characteristics of Hydraulic Jump on a Striped Channel Bed

Abstract

The substantive conditions are affecting the subjective process of creating rapid turbulent changes in flow. Such character happens in hydraulic jump phenomenon, which depends on how much of flow kinetic energy changes into potential energy. During this process part of the kinetic energy is dissipated by taking other types of energy in the channel. The quantity of energy dissipated reflects on the height and length of the jump. The effects of lowering the bed of channel by means of square strips of six different spaces (2, 3, 4,5,6,7 cm) respectively are studied experimentally with additional smooth bed. The investigation leads that bed strips increases the energy dissipation by 6%. The energy dissipation increases with the increase of strips spacing, the best spacing is between 5 and 6 cm. Consequently jump height decreases which is reflected by the reduction of the relative sequent depth value by (6%-15%). While the relative length of jump decreases by 22% and 28% compared with the smooth bed. The mean dimensionless depth deficit is 0.15 and normalized jump length is 2.5. Within the limitations of this work, different relationships are suggested to predict hydraulic jump characteristics with coefficient of determination more than 0.9.

Numerical and analysis effects of rectangular prism rough beds on hydraulic jumps in open channels

“…This study builds upon the physical models proposed by JALIL, SARHAN [8], which aim to reduce hydraulic jump characteristics. However, the original model still required modification to achieve optimal results.…”

“…Based on the above grid selection, grid 2 will be used for validating the numerical model. The experimental data of JALIL, SARHAN [8] will be used to validate the Flow-3D model. This paper compares the hydraulic jumps in the Sheet (2) model test 4 and R_IV model numerical simulations with the experimental data [8].…”

“…The experimental data of JALIL, SARHAN [8] will be used to validate the Flow-3D model. This paper compares the hydraulic jumps in the Sheet (2) model test 4 and R_IV model numerical simulations with the experimental data [8]. The geometrical parameters of both the physical and numerical models are specified in Fig.…”

“…These studies aimed to analyze the impact of rough beds on hydraulic jump characteristics such as sequent depth, jump length, energy loss, and velocity field. Using experiments and numerical models, researchers have investigated the phenomenon of stable and free hydraulic jumps on rough beds [1][2][3][4][5][6][7][8][9]. The results indicate that the rough bed reduces the downstream water depth and jump length, without causing channel structure cavitation.…”

“…This study proposes a novel approach to analyze the impact of rough beds in the form of rectangular prisms on the primary hydraulic jump characteristics. Based on the previous research by JALIL, SARHAN [8],…”