عنوان مقاله [English]
In this research, the single and turbulent surface jet is evaluated for discharge of dense current by evaluating the effect of various parameters on circular surface buoyant jet flow. To achieve the purposes of this research, a physical model with 3.2 m length, 0.6 m width and 0.9 m height was applied. Then, the experiments were conducted by using the nozzles with diameters of 5, 8 and 15 mm at different contraction angles. The final limit of horizontal length of jet flux to inlet of effluent position (plunge point position), Xp, the maximum of upper limit length, Xmax, and the maximum of inferior limit length were considered as important properties of path trajectory. Findings showed development of surface jet flux occurred in supercritical Froude Number. Hence, the trajectory properties including Xp, Xmax and Xmin was increased by 41, 40 and 45 percent with increase of contraction angle 15 into 90 degrees, respectively. Result of statistical analysis showed a nonlinear relationship exists as a satisfactory correlation between trajectory properties and jet flux parameters.
Keywords: Contraction Angle, Densimetric Froude Number, Jet Flux, Progressive Weber Number, Trajectory
Abessi, O. and Roberts, P. 2014. Multiport diffusers for dense discharges. J. Hydraul. Eng. ASCE.
Abessi, O., Saeedi, M., Bleninger, T. and Davidson, M. 2012. Surface discharge of negatively buoyant effluent in unstratified stagnant water. J. Hydro-Environ. Res. 6(3): 181-193.
Abessi, O., Saeedi, M., Hajizadeh-Zaker, N. and Khirkhah-Gildeh, H. 2011. Flow characterization dilution in surface discharge of negatively buoyant flow in stagnant and non-stratified water bodies. J. Water Waste Water. 22(4): 71-82. (in Persian)
Ahadiyan, J., Mohamadi, F. and Bahrami, H. 2014. Effect of vertical angle and hydraulic properties on flow distribution of single dense jet using physical model. J. Khoramshahr Marine Sci. Technol. 13(1): 51-60. (in Persian)
Ahadiyan, J. and Musavi-Jahromi, S. H. 2010. Evaluation of effective parameters on buoyant jets development in the stagnant ambient fluid. J. Water Soil. 23(4): 179-192. (in Persian)
Ahadiyan, J. and Musavi-Jahromi, S. H. 2009. Effects of jet hydraulic properties on geometry of trajectory in circular buoyant jets in the static ambient flow. J. Appl. Sci. 9(21): 3843-3849.
Cuthberston, A. and Davis, P. 2008. Deposition from particle-laden, round, turbulent, horizontal, buoyant jets in stationary and coflowing receiving fluids. J. Hydraul. Eng. ASCE. 134(4): 390-402.
Dastgheib, S., Musavi-Jahromi, S. H. and Nowroozpour, A. 2013. Predicting hydraulic properties of circular buoyant jets in the static ambient flow using ANN and ANFIS. World Environmental and Water Resources Congress. May 19-23. Ohio.
De wit, L., Van Rhee, C. and Keetels, G. 2014. Turbulent interaction of a buoyant jet with cross-flow. J. Hydraul. Eng. ASCE. 140(12): 04014060.
Jirka, G. H. 2006. Integral model for turbulent buoyant jets in unbounded stratified flows. Part 2: plane jet dynamics resulting from multiport diffuser jets. Environ. Fluid Mech. 6(1): 43-100.
Kheirkhah-Gildeh, H., Mohammadian, A., Nistor, I. and Qiblawey, H. 2014. Numerical modeling of turbulent buoyant wall jets in stationary ambient water. J. Hydraul. Eng. ASCE. 140(6): 04014012.
Kourafalou, V. H. 2001. River plume development in semi-enclosed mediterranean regions: north adriatic sea and northwestern Aegean sea. J. Marine Syst. 30(3-4): 181-205.
Lai, C. C. K. and Lee, j. H. W. 2012. Mixing of incliend dense jet in stationary ambient. J. Hydro- Environ. Res. 6(1): 9-28.
Lee, Y., Cho, J., Seo, Y., Lee, J. and Ahn, K. 2002. Modeling of submerged membrane bioreactor process for wastewater treatment processes. Desalination. 146, 451-457.
Oliver, C. J., Davidson, M. J. and Nokes, R. I. 2013a. Predicting the near-field mixing of desalination discharges in a station environment. Desalination. 309, 148-155.
Oliver, C. J., Davidson, M. J. and Nokes, R. I. 2013b. Removing the boundary influence on negatively buoyant jets. J. Environmen. Fluid Mech. 13, 625-648.
Oliver, C. J., Davidson, M. J. and Nokes, R. I. 2013c. Behavior of dense discharges beyond the return point. J. Hydraul. Eng. ASCE. 139(12): 1304-1308.
Salmanzade, S. and Ahadiyan, J. 2016. Distribution limit of jet flow in the same and dissimilar phases of ambient fluid. J. Irrig. Sci. Eng. 39(1): 93-107.
Shao, D. and Law, A. W. K. 2011. Boundary impingement and attachment of horizontal offset dense. J. Hydro-Environ. Res. 5(1): 15-24.
Zhang, W. and Zhu, D. 2014. Trajectories of air-water bubbly jets in crossflows. J. Hydraul. Eng. ASCE. 140(7): 06014011.