Exploring the Influence of Divergence and Convergence Angles on Hydraulic Jump Characteristics in Divergent-Convergent Transformations: A Laboratory Study

Subject Areas : Article frome a thesis

Mohammad Hosein Jafari Abnavi ¹ , Reza Mohammadpour ^{2 *} , Mohammad Karim Beirami ³

1 - depratment of civil engineering- Islamic azad university - Estahban branch
2 - Assistant Professor, Department of Civil Engineering, Islamic Azad University, Estahban branch, Iran
3 - Associate Professor, Isfahan University of Technology, Iran

Received: 2024-02-29 Accepted : 2024-08-17 Published : 2024-08-17

Keywords: Divergent basin, hydraulic jump, divergent-convergent transformations, Second depth,

Abstract :

Introduction: Hydraulic jumps are used as one of the key factors for energy dissipation in the downstream of hydraulic structures such as gates and spillways. This research focuses on studying hydraulic jumps in divergent-convergent basins while considering the influence of the divergence angle.

Methods: All experiments were conducted in a channel with a length of 11, depth of 0.7 and width of 0.48 meters using two basin models, which have a divergence and convergence angle of 8 and 6 degrees, respectively, and vice versa.

Findings: The results show that at the maximum flow rate, the ratio of flow depth  and flow length  in the first model is 48.6 and 122.9% respectively and in the second model it is 35.5% and 95.8% respectively has decreased compared to the classic basin. On the other hand, the ratio of energy loss in both models has increased by 26.8 and 23.7 percent, respectively, compared to classic basins. The comparison of the results between the two divergent-convergent basins, showed that increasing the ratio of the angle of divergence to convergence  will increase the performance of the basins.

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