Study of Near Field Performance of Multi-ports Diffuser in Relatively Deep Rivers.
El-Alfy, K., Sobeih, M., Khattab, A., Saad, M., Shawky, Y. (2021). Study of Near Field Performance of Multi-ports Diffuser in Relatively Deep Rivers.. EKB Journal Management System, 27(2), 1-13. doi: 10.21608/bfemu.2021.142617
Kasem Salah Abd El-Wahab El-Alfy; M. F. Sobeih; A. F. Khattab; M. B. Saad; Y. M. Shawky. "Study of Near Field Performance of Multi-ports Diffuser in Relatively Deep Rivers.". EKB Journal Management System, 27, 2, 2021, 1-13. doi: 10.21608/bfemu.2021.142617
El-Alfy, K., Sobeih, M., Khattab, A., Saad, M., Shawky, Y. (2021). 'Study of Near Field Performance of Multi-ports Diffuser in Relatively Deep Rivers.', EKB Journal Management System, 27(2), pp. 1-13. doi: 10.21608/bfemu.2021.142617
El-Alfy, K., Sobeih, M., Khattab, A., Saad, M., Shawky, Y. Study of Near Field Performance of Multi-ports Diffuser in Relatively Deep Rivers.. EKB Journal Management System, 2021; 27(2): 1-13. doi: 10.21608/bfemu.2021.142617

Study of Near Field Performance of Multi-ports Diffuser in Relatively Deep Rivers.

MEJ- Mansoura Engineering Journal
Article 6, Volume 27, Issue 2, June 2002, Page 1-13  XML PDF (410.73 K)
Document Type: Research Studies
DOI: 10.21608/bfemu.2021.142617
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Authors
Kasem Salah Abd El-Wahab El-Alfy* 1; M. F. Sobeih2; A. F. Khattab3; M. B. Saad4; Y. M. Shawky5
1Irrigation & Hydraulics Department., Faculty of Engineering., El-Mansoura University., Egypt.
2Associate Professor., Civil Engineering Department., Faculty of Engineering., Minufiya University., Egypt.
3Professor., Chan, Maintiance Res, Inst., National Research Centre., Egypt.
4Professor., Director of Hydr. Res. Inst.(HRI), National Water Research Centre, Egypt.
5Ph.D, Researcher, Hydr. Research. Institute (HRI). Egypt.
Abstract
In this paper an experimental study is presented for the problem of the thermal power stations, which is discharging the hot water into relatively deep rivers. The receiving water of the river is said to be deep when the jet is free to mix due to entrainment and buoyancy and is not constrained by neither the river bed nor the water surface (6), which increases the temperature dilution. The water depth (H) is constant during the experiments. The main objective of this paper is to develop a new general equation which can be used in designing the multi-ports diffuser of the thermal power plant discharging hot water into relatively deep rivers. Also, the rapid dilution and minimizing of the mixing zone length of the hot water 10 reduce the environmental effects are considered. In this paper, the effects of the different parameters related to both the out-fall structure and the river characteristics on the rapid dilution of the hot water concentration (Cm/Co) are considered. These parameters are, the effluent/ambient velocity ratio (V/U), the number of ports (n), the spacing between the ports with respect to its diameter (s/D). the vertical angle of ports in combination with the ratio of its height to the flow depth (θh/H), and the horizontal angle between the diffuser line and the flow direction (β). The analysis of the experimental results shows that the relative thermal concentration ( 
Cm/Co ) is directly proportional to V/U, n, θh/Hand β. while it is inversely proportional to SD. Also, it is found that the maximum value of Cm/Co occurs when the diffuser is aligned parallel to the direction of flow. A general equation between the relative thermal concentration (Cm/Co) and the aforementioned parameters is developed. The comparative study between the experimental results, which is carried out by Mowed [7], and the corresponding results by applying the developed equation, illustrates that there is a good compatibility between the two results.
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