Dilution of a Single-Port Submerged Diffuser with Fixed Vanes

Document Type : Original Research Paper

Authors

1 National Water Research Center (NWRC), Hydraulics Research Institute (HRI), El-Qanater El-Khiriaya 13621, Egypt

2 Department of Mechanical Power Engineering., Faculty of Engineering, Fayoum University, Fayoum 63514, Egypt

3 Technical College, Imam Ja'afar Al-Sadiq University, Baghdad, Iraq

4 Mechanical Eng. Dept., Faculty of Engineering, South Valley University, Qena-83523, Egypt

10.22059/poll.2024.374295.2305

Abstract

Thermal pollution refers to the alteration of water properties caused by the use of water as a cooling fluid. This occurs when water is pulled from a water source, condensed to release heat, and then recirculated back into the water source as thermal discharge. The characteristics of thermal discharge dilution are influenced by factors such as jet momentum, buoyancy, turbulence-induced distribution, density stratification of the surrounding environment, configuration of water currents, presence of solid boundaries, and heat exchange at the surface. A single-port diffuser is used for the discharge of hot water. This study employed experimental methods to investigate the impact of fixed vanes on the thermal effluent dilution of a single-port submerged diffuser. The use of fixed vanes increases the dilution of a single-port submerged diffuser. Using fixed vans for H= 1, ΔTm was reduced by 3.13%, 10.26%, and 2.74%, and ΔTe was reduced by 15.66%, 17.86%, and 22.86%, respectively, for each flow ratio. For H= 2, ΔTm decreased by 2.38%, 3.41%, and 4.48%, and ΔTe decreased by 8.33%, 15%, and 16.67%, respectively, for each flow ratio. For H= 3, ΔTm decreased by 2.86%, 2.22%, and 3.45%, and ΔTe decreased by 5%, 29.41%, and 22.73%, respectively, for each flow ratio. In addition, increasing the Reynolds number ratio reduces the mixing zone and increases the dilution temperature.

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References

Ahmad, N., & Baddour, R. E. (2012). Dilution and penetration of vertical negatively buoyant thermal jets. Journal of Hydraulic Engineering, 138(10), 850–857. 
Ahmad, N., & Suzuki, T. (2016). Study of dilution, height, and lateral spread of vertical dense jets in marine shallow water. Water Science & Technology, 73(12), 2986–2997.
Angelidis P.B. (2001). A Numerical Model for The Mixing of an Inclined Submerged Heated Plane Water Jet in Calm fluid. International Journal of Heat and Mass Transfer, volume, 45, pp. 2567–2575.
Ashmawy, A., Aboelnasr, M., El-Ghorab, E. A., Hashim, M., & Abotaleb, H. (2020). Dilution of single port submerged diffuser clogged by a free rotating propeller. American Journal of Engineering and Applied Sciences, 13(2), 182–190.
Chowdhury M.R., and Testik F.Y. (2014). A review of gravity currents formed by submerged single-port discharges in inland and coastal waters. Environ Fluid Mech., volume 14, pp. 265–293.
Economopoulou, M. A., Economopoulou, A. A., & Economopoulos, A. P. (2003). Sensitivity Analysis and Comparative Performance of Outfalls with Single Buoyant Plumes. Journal of Environmental Engineering, 129(2), 169–178.
Huai, W., & Fang, S. (2006). Numerical simulation of obstructed round buoyant jets in a static uniform ambient. Journal of Hydraulic Engineering, 132(4), 428–431.
Huang, H., Fergen, R. E., Proni, J. R., & Tsai, J. J. (1998). Initial dilution equations for Buoyancy-Dominated jets in current. Journal of Hydraulic Engineering, 124(1), 105–108.
Jirka G.H. (2004). Integral Model for Turbulent Buoyant Jets in Unbounded Stratified Flows. Part I: Single Round Jet. Environmental Fluid Mechanics, Volume 4, pp.1–56.
Kim D.G., and Cho H.Y. (2006). Modeling the buoyant flow of heated water discharged from surface and submerged side outfalls in shallow and deep water with a cross flow. Environ Fluid Mech., volume 6, pp. 501–518.
Kim, J. K., Savulescu, L., & Smith, R. (2001). Design of cooling systems for effluent temperature reduction. Chemical Engineering Science, 56(5), 1811–1830.
Kim, Y. D., Seo, I. W., Kang, S. W., & Oh, B. C. (2002). Jet Integral–Particle Tracking Hybrid model for single buoyant jets. Journal of Hydraulic Engineering, 128(8), 753–760.
Ibrahim, M., Ashmawy, A., Dalia, M., & Refaey, M. A. (2023). Numerical investigation of the effect of hot-water outlet inclination angle on the temperature dilution in open channel flow. Ain Shams Engineering Journal, 14(12), 102234.
Marmorino, G., Savelyev, I., & Smith, G. B. (2014). Surface thermal structure in a shallow-water, vertical discharge from a coastal power plant. Environmental Fluid Mechanics, 15(1), 207–229.
Paik J. (2011). Numerical Simulation of Thermal Discharges in Crossflow . IEEE 3rd International Conference on Communication Software and Networks, Xi’an, China, pp. 328-332.
Stamou A.I., and Nikiforakis I.K. (2013). Integrated modelling of single port, steady-state thermal discharges in unstratified coastal waters. Environ Fluid Mech., volume 13, pp. 309–336.
Tang H.S., Paik J., Sotiropoulos F., and Khangaonkar T. (2008). Three-Dimensional Numerical Modeling of Initial Mixing of Thermal Discharges at Real-Life Configurations. Journal of Hydraulic Engineering, Volume 134, pp. 1210-1224.
Wen-xin H. and Shen-guang F. (2006). Rounded flowing states of obstructed buoyant jet. Applied Mathematics and Mechanics, 27(8), 1133–1139. 
Huai, W., Fang, S., & Dai, H. (2006). Behavior of obstructed square buoyant vertical jets in static ambient (I)—verification of mathematical model and numerical method. Applied Mathematics and Mechanics, 27(5), 645–652.
Yazdi S.S. R., and Marvasti S.S. (2010). Depth average simulation of thermal mixing mechanism of a power-plant in the coastal region. Second International Symposium on Environmental Engineering, January 19-21, Tehran, Iran.
Zeng, Y., & Huai, W. (2008). Characteristics of round thermal discharging in a flowing environment. Journal of Hydro-environment Research, 2(3), 164–171.  
Pollution
Volume 11, Issue 1
November 2024
Pages 23-38

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