Estimating Depth Spreading Coefficient of Convergent Plane Surface Jet Flow Into Deep Ambient

Document Type : Research Paper

Authors

1 M.Sc. Graduate., River Engineering, Khorramshahr University of Marine Science and Technology, Iran

2 Assist. Prof., Marine Structures Dept., Khorramshahr University of Marine Science and Technology, Iran

3 Assoc. Prof., Water Engineering Dept., Shahid Chamran University of Ahvaz, Iran

Abstract

In this study, the depth spreading coefficient in surface discharge of dense jet flow from convergent and inclined rectangular channels into deep and stagnant ambient have been investigated. Therefore, the experiments were done in the hydraulic laboratory of Shahid Chamran University on a flume with 3.2-meter length, 0.6-meter width and 0.9-meter depth. For purposes of this research, the jet flow was injected with three different flow rates and concentrations. Also, for surface discharge of the jet flow, a rectangular channel with floor width of 6 cm and four different convergence angles of 12.5, 25, 45 and 90 degrees was used. The discharge channel was installed in three slopes of 0, 4 and 8 percent in order to be the surface discharge of the jet fluid tangent to the ambient water surface. After conducting the tests, the data were analyzed using the routing process of the prepared images. Then, the coefficients of depth spreading were calculated and the results were extracted. The results showed that increasing the channel slope, reducing the convergence angle and increasing densimetric Froude number increased the depth spreading coefficient. Quantitatively, the results showed that change of channel slope from 0 to 8 percent caused an increase in the spreading coefficient up to 34 percent and the change of convergence angle from 90 to 12.5 degrees caused an increase up to 27 percent. Finally, a statistical relationship between spreading coefficient and the other relevant parameters was extracted that its root mean square error was obtained 0.024.

Keywords

References

Abessi O, Saeedi M, Hajizadeh-Zaker N and Kheirkhah H, 2010. Flow characterization dilution in surface discharge of negatively buoyant flow in stagnant and non-stratified water bodies. Journal of Water and Wastewater 4: 71-82.
Abessi O, Saeedi M, Hajizadeh-Zaker N and Kheirkhah-Gildeh H, 2011. Waste field characteristics, ultimate mixing and dilution in surface discharge of dense jets into stagnant water bodies. Journal of Water and Wastewater 1: 2-14.
Ahadian J and Musavi-Jahromi SH, 2009. Effects of jet hydraulic properties on geometry of trajectory in circular buoyant jets in the static ambient flow. Journal of Applied Sciences 9(21): 3843-3849.
Albertson ML, Dai YB, Jensen RA and Rouse H, 1950. Diffusion of submerged jets. Trans 115: 639-644.
Bleninger T and Jirka GH, 2008. Modelling and environmentally sound management of brine discharges from desalination plants. Desalination 221: 585-597.
Bleninger T, Neipelt A and Jirka GH, 2009. Desalination plant discharge calculator. Clean water and energy Conference. May 17-20 Baden-Baden Germany.
Bradbury LJS, 1965. The structure of a self-preserving turbulent plant jet. Journal of Fluid Mechanic 23: 31-64.
Davidson MJ and Wang HJ, 2002. Strongly advected jet in a coflow. Journal of Hydraulic Engineering 128(8): 742-752.
Del Ben JV, Jirka GH and Largier J, 1994. Ocean brine disposal. Journal of Hydraulic Engineering 97(1-3): 365-372.
Gustaffson B and Larsen I, 1970. Jet diffusion in stagnant stratified waters. Journal of Water Research 4:353-361.
Jirka GH, 2004. Integral model for turbulent buoyant jets in unbounded stratified flows. Part I: Single round jet. Environmental Fluid Mechanics 4: 1-56.
Kassem A, Imran J and Khan J, 2003. Three-Dimensional modelling of negatively buoyant flow in diverging channels. Journal of Hydraulic Engineering 129(12): 936-947.
Kotsovinos NE, 1976. A note on the spreading rate and virtual origin of a plane turbulent jet. Journal of Fluid Mechanic 77: 305-311.
Manabendra P, Anoop D and Anupam D, 2008. An investigation of turbulent rectangular jet discharged into a narrow channel weak crossflow. Journal of Hydrodynamics 20: 154-163.
Miller D and Comings E, 1957. Static pressure distribution in the free turbulent jet. Journal of Fluid Mechanic (3): 1-16.
Nash JD and Jirka GH, 1996. Buoyant surface discharges into unsteady ambient flow. Dynamics of Atmospheres and Oceans 24: 75-84.
Ogino F and Katai K, 1994. Buoyancy effect on three-dimentional turbulent surface jet. Journal of Heat Mass Transfer 37(1): 281-289.
Palomar P, Lara LJ and Rodrigo M and Alvarez A, 2012. Near field brine discharge modelling. Part 1: Analysis of commercial tools. Desalination 290: 14-27.
Shahrabani DM and Ditmars JD, 1976. Negatively buoyant slot jets. Coastal Engineering 29: 2976-2993.
Voustrou MK, Yannopoulos PC and Christodoulou GC, 2015. Experiments on plane negatively buoyant jets. Proceedings of the 36th  JAHR World Congress 28 June- 3 July, Hague, Netherlands.
 
Water and Soil Science
Volume 27, Issue 4
January 2017
Pages 27-36

Files

Share

How to cite

Statistics