Journal Menu

Archive

Last Edition
Journal information

Vol.1, No.2, 2022: pp.57-64

FLOW AND ENERGY DISSIPATION OVER A CYLINDRICAL STEPPED WEIR

Authors:

Mazin S. Jomaa, Ahmed Y. Mohammed

Received: 30.04.2022.
Accepted: 16.06.2022.
Available: 30.06.2022.

Abstract:

The great economic importance of increasing the energy dissipation flow rate in stepped weirs prompted researchers to make several changes to the geometrical shape. In this study, (36) physical models were constructed to compare cylindrical stepped weirs with traditional weirs. (27) Models of cylindrical stepped weirs and (9) traditional stepped weirs were based on three heights and three diameters of steps. There are three shapes of the weir steps (Fc = all the steps in a circular shape, i.e., without cutting), (Fc & Hc = one round and the other half cut, respectively) and (Hc = all the steps are cut in half). The study showed that the percentage of energy dissipation in weirs increases with the height of the weir (P). Increasing the diameter of the degree (D) and increasing the number of steps (n), and changing the shape of the degrees, as the case (Fc & Hc) was better than the case (Fc). In contrast, the state (Hc) was the best among the other instances in the percentage of flow energy dissipation. The cylindrical gradient weirs are more efficient than traditional stepped weirs by approximately (10%), and the highest value for the energy dissipation of the flow was obtained for stepped cylindrical weirs (67.27%).

Keywords:

MCDM, R method, CURLI method, data normalization, weight

References:

[1] J. H. Kim, Water quality management by stepped overflow weir as a method of instream flow solution. In Proceedings of the First International Conference on Solutions of Water Shortage and Instream Flow Problems in Asia, Incheon, Korea, 2003, pp.24-36.
[2] H. Chanson, Forum article. Hydraulics of stepped spillways: current status. Journal of hydraulic engineering, 126(9), (2000): 636-637. https://doi.org/10.1061/(ASCE)0733-9429(2000)126:9(636)
[3] A. N. AL-Talib, H.A. AL-Majeed Hayawi, (2009). Laboratory study of flow energy dissipation using stepped weirs. Al-Rafidain Engineering Journal (AREJ), 17(4), 42-51. https://doi.org/10.33899/rengj.2009.43300
[4] A. N. AlTalib, A. Y. Mohammed, H. A. Hayawi. Hydraulic jump and energy dissipation downstream stepped weir. Flow Measurement and Instrumentation, 69, (2019): 101616. https://doi.org/10.1016/j.flowmeasinst.2019.101616
[5] A. -H. K. Al-Shukur, S. K. H. Al-Khalaf, I. M. A. Alsharifi, Flow characteristics and energy dissipation losses in different configurations of steps of the stepped spillway. International Journal of Innovative Research in Science, Engineering and Technology, 3(1), (2014):8823-8832.
[6] T. R. Al-Husseini, Experimental study of increasing energy dissipation on the stepped spillway. Journal of Kerbala University, 13(3), (2015): 87-100.
[7] T. R. Abdul-Mehdi, H. A. Al-Mussawy, A. S. T. AlMadhhachi, A laboratory study attempts of flow and energy dissipation in stepped spillways. Journal of Engineering, 22(12), (2016): 48-64.
[8] J. S. Maatooq, Kinetic Energy Dissipation on Labyrinth Configuration Stepped Spillway. Tikrit Journal of Engineering Sciences, 23(3), (2016): 12-24. https://doi.org/10.25130/tjes.23.3.02
[9] T. R. Al-Husseini, A Novel experimental work and study on flow and energy dissipation over stepped spillways. Journal of Babylon University-Engineering Sciences, 24(4), (2016): 1050-1063.
[10] A. Hamedi, M. Ketabdar, Energy loss estimation and flow simulation in the skimming flow regime of stepped spillways with inclined steps and end sill: A numerical model. International Journal of Science and Engineering Applications, 5(7), (2016): 399-407. https://doi.org/10.7753/IJSEA0507.1006
[11] D. S. Krisnayanti, Soehardjono, V. Dermawan, M. Sholichin, Flow and energy dissipation over on flat and pooled stepped spillway. Jurnal Teknologi (Sciences & Engineering) 78(8), (2016): 79-86.
[12] U. A. Jahad, R. Al-Ameri, S. Das, Energy dissipation and geometry effects over stepped spillways. International journal of civil engineering and technology, 7(4), (2016): 188- 198.
[13] A. A. J. Jamel, Numerical Simulation for Estimating Energy Dissipation over Different Types of Stepped Spillways and Evaluate the Performance by Artificial Neural Network. Tikrit Journal of Engineering Sciences, 25(2), (2018): 18-26. http://dx.doi.org/10.25130/tjes.25.2.03
[14] G. M. A. Aal, M. Sobeah, E. Helal, M. El-Fooly, Improving energy dissipation on stepped spillways using breakers. Ain Shams Engineering Journal, 9(4), (2018): 1887-1896 http://dx.doi.org/10.1016/j.asej.2017.01.008
[15] A. Ghaderi, S. Abbasi, J. Abraham, H. M. Azamathulla, Efficiency of trapezoidal labyrinth shaped stepped spillways. Flow measurement and instrumentation, 72, (2020): 101711. https://doi.org/10.1016/j.flowmeasinst.2020.101711

© 2022 by the authors. This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0)

Volume 3
Number 2
June 2024.

 

Loading

How to Cite

M.S. Jomaa, A.Y. Mohammed, Flow and Energy Dissipation Over a Cylindrical Stepped Weir. Advanced Engineering Letters, 1(2), 2022: 57–64.
https://doi.org/10.46793/adeletters.2022.1.2.4

More Citation Formats

Jomaa, M. S., & Mohammed, A. Y. (2022). Flow and Energy Dissipation Over a Cylindrical Stepped Weir. Advanced Engineering Letters1(2), 57–64. https://doi.org/10.46793/adeletters.2022.1.2.4

Jomaa, Mazin S., and Ahmed Y. Mohammed. “Flow and Energy Dissipation Over a Cylindrical Stepped Weir” Advanced Engineering Letters, vol. 1, no. 2, July 2022, pp. 57–64, https://doi.org/10.46793/adeletters.2022.1.2.4.

Jomaa, Mazin S., and Ahmed Y. Mohammed. 2022. “Flow and Energy Dissipation Over a Cylindrical Stepped Weir.” Advanced Engineering Letters 1 (2): 57–64. https://doi.org/10.46793/adeletters.2022.1.2.4.

Jomaa, M.S. and Mohammed, A.Y. (2022). Flow and Energy Dissipation Over a Cylindrical Stepped Weir. Advanced Engineering Letters, 1(2), pp.57–64. doi: 10.46793/adeletters.2022.1.2.4.