TECHNICAL PAPERS
Sep 1, 1994

Short Circuiting and Density Interface in Primary Clarifiers

Publication: Journal of Hydraulic Engineering
Volume 120, Issue 9

Abstract

The unsteady flow regime and the temperature mixing in temperature‐stratified settling tanks associated with a warm influent are investigated by application of a numerical model with two different turbulence models. The model consists of a series of conservation equations for fluid mass, momentum, and temperature, with one version using the algebraic stress model and the other version using the conventional kε model. The simulation results are compared with existing experimental data for the temperature distribution. The velocity measurements were made under the same laboratory conditions that were used for the temperature surveys. The experimental results are presented and compared with those predicted by the numerical model.

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References

1.
Abdel‐Gawad, S. M., and McCorquodale, J. A. (1984). “Strip integral method applied to settling tanks.” J. Hydr. Engrg., ASCE, 110(1), 1–17.
2.
Adams, E. W., and Rodi, W. (1990). “Modeling flow and mixing in sedimentation tanks.” J. Hydr. Engrg., ASCE, 116(7).
3.
Autret, A., and Grandotto, M. (1987). “Finite element computation of a turbulent flow over a two‐dimensional backward‐faceing step.” Int. J. for Numerical Methods in Fluids, Vol. 7, 89–102.
4.
Baddour, R. E. (1991). “Thermal hydraulic jump: theory and experiment.” J. Fluid Mech., Vol. 226, 243–256.
5.
Camp, T. R. (1946). “Sedimentation and the design of settling tanks.” Trans., ASCE, Vol. 111, 895–936.
6.
Casonato, M., and Gallerano, F. (1990). “A finite difference self‐adaptive mesh solution of flow in a sedimentation tank.” Int. J. for Numerical Methods in Fluids, Vol. 10, 697–711.
7.
Chen, C. J. (1985). “Prediction of turbulent flows in rectangular cavity with kεe and kεa models.” Proc., Int. Symp. on Refined Flow Modelling and Turbulence Measurements, Iowa City, Iowa.
8.
Celik, I., Rodi, W., and Stamou, A. (1985). “Prediction of hydrodynamic characteristics of rectangular settling tanks.” Proc., Int. Symp. Refined Flow Modelling and Turbulence Measurements, Iowa City, Iowa.
9.
Celik, I., and Rodi, W. (1988). “Modeling suspended sediment transport in nonequilibrium situations.” J. Hydr. Engrg., ASCE, 114(10), 1157–1188.
10.
DeVantier, B. A., and Larock, B. E. (1986). “Modeling a recirculation density‐driven turbulent flow.” Int. J. for Numerical Methods in Fluids, 6(4), 241–253.
11.
DeVantier, B. A., and Larock, B. E. (1987). “Modeling sediment‐induced density current in sedimentation basins.” J. Hydr. Engrg., 113(1), 80–94.
12.
Dobbins, W. E. (1944). “Effect of turbulence on sedimentation.” Trans., ASCE, 109(2218), 629–656.
13.
Godo, A. M. (1989). “A study of density current in settling tanks,” M.S. thesis, University of Windsor, Windsor, Canada.
14.
Guetter, A. K., and Jain, S. C. (1991). “Analytical solution for density currents in settling basins.” J. Hydr. Engrg., ASCE, 117(3), 324–345.
15.
Heinke, G. W. (1974). “Design and performance criteria for settling tanks for removal of physical‐chemical flocs.” Summary Rep., University of Toronto, Canada.
16.
Heinke, G. W., Qazi, M. A., and Tay, A. (1975). “Design and performance criteria for settling tanks for removal of physical‐chemical flocs.” Res. Rep., University of Toronto, Canada.
17.
Hinze, S. O. (1975). Turbulence. McGraw‐Hill, New York, N.Y.
18.
Hossain, M. S., and Rodi, W. (1982). “A turbulence model for buoyant flows and its application to vertical buoyant jets.” Turbulent Jets and Plumes, W. Rodi, ed., Pergamon Press, Tarrytown, N.Y.
19.
Imam, E., McCorquodale, J. A., and Bewtra, J. K. (1983). “Numerical modelling of sedimentation tanks.” J. Hydr. Engrg., ASCE, 109(12), 1740–1754.
20.
Krebs, P. (1991). “The hydraulics of final settling tanks.” Water Sci. and Tech., 23(4/6), 1037–1046.
21.
Larsen, P. (1977). “On the hydraulics of rectangular settling basins, experimental and theoretical studies.” Rep. No. 1001, Dept. of Water Resources Engineering, Lund Institute of Technology, Lund University, Lund, Sweden.
22.
Lyn, D. A., and Zhang, Z. (1989). “Boundary‐fitted numerical modelling of sedimentation tanks.” Proc., 23rd, IAHR and AIRH Conf., Ottawa, Canada.
23.
Lyn, D. A., and Rodi, W. (1990). “Turbulence measurements in model settling tank.” J. Hydr. Engrg., ASCE, 116(1), 3–21.
24.
Lyn, D. A., Stamou, A. I., and Rodi, W. (1992). “Density currents and shear‐induced flocculation in sedimentation tanks.” J. Hydr. Engrg., ASCE, 118(6), 849–867.
25.
McCorquodale, J. A. (1976). “Hydraulic study of the circular settling tanks at the West Windsor Pollution Control Plant.” Rep., University of Windsor, Windsor, Ontario, Canada.
26.
McCorquodale, J. A. (1987). “Density currents in clarifiers.” Proc., 1987 Nat. Conf. on Hydr. Engrg., ASCE, New York, N.Y.
27.
McCorquodale, J. A., Yuen, E. M., Vitasovic, Z., and Samstag, R (1991). “Numerical simulation of unsteady conditions in clarifiers.” Water Poll. Res. J., Canada, 26(2), 201–222.
28.
Ni, H., Wang, N., and Zhong, Y. (1987). “Numerical simulation of turbulence flow in discharge and intake of power station.” Chinese J. of Water Resour., 10(6), 11–16.
29.
Patankar, S. V., and Spalding, D. B. (1972). “A calculation procedure for heat, mass and momentum trasfer in three‐dimensional parabolic flow.” Int. J. Heat Mass Transfer, Vol. 15, 1787.
30.
Patankar, S. V. (1980). Numerical heat transfer and fluid flow. McGraw‐Hill, New York, N.Y.
31.
Rodi, W. (1980). “Turbulence models and their application in hydraulics: a state‐of‐the‐art review.” Rep., International Association for Hydraulic Research, Delft, The Netherlands.
32.
Rodi, W. (1985). “Calculation of stably stratified shear‐layer flow with a buoyancy‐extended kε model.” Turbulence and diffusion in stable environment, J. C. R. Hunt, ed., Oxford University Press, Oxford, England, 111–140.
33.
Schamber, D. R., and Larock, B. E. (1981). “Numerical analysis of flow in sedimentation basins.” J. Hydr. Div., ASCE, 107(5), 575–591.
34.
Zhou, S., and McCorquodale, J. A. (1992a). “Modeling of rectangular settling tanks.” J. Hydr. Engrg., ASCE, 118(10), 1391–1405.
35.
Zhou, S., and McCorquodale, J. A. (1992b). “Influence of skirt radius on performance of circular clarifier with density stratification.” Int. J. for Numerical Methods in Fluids, 14(8), 919–934.
36.
Zhou, S., McCorquodale, J. A., and Vitasovic, Z. (1992c). “Influences of density on circular clarifier with baffles.” J. of Envir. Engrg., ASCE, 118(6), 829–847.
37.
Zhou, S., and McCorquodale, J. A. (1992d). “Mathematical modelling for a circular clarifier.” Can. J. Civ. Engrg., 19(3), 365–374.
38.
Zhou, S., McCorquodale, J. A., and Ji, Z. (1993). “Semi‐implicit skew upwind method for problems of environmental hydraulics.” Int. J. for Numerical Methods in Fluids, Vol. 17, 803–823.

Information & Authors

Information

Published In

Go to Journal of Hydraulic Engineering
Journal of Hydraulic Engineering
Volume 120Issue 9September 1994
Pages: 1060 - 1080

History

Received: Jan 4, 1993
Published online: Sep 1, 1994
Published in print: Sep 1994

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Authors

Affiliations

Siping Zhou
Res. Assoc., Dept. of Civ. and Envir. Engrg., Univ. of Windsor, Windsor, Canada N9B 3P4
J. A. McCorquodale, Member, ASCE
Prof., Dept. of Civ. and Envir. Engrg., Univ. of Windsor, Windsor, Canada N9B 3P4
A. M. Godo, Member, ASCE
Hydr. Engr., R. Meo and Assoc., Consulting Engrs., Windsor, Canada N8X 3N9

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