Circulation regions always exist in the settling tanks. These regions reduce the tank’s performance and decrease effective volume of the tank. Recirculation zones would also result in short-circuiting and high flow mixing problems. Inlet position would also have effect on these, too. Using good baffle configuration may increase performance of settling tanks. One method for comparison of different tanks with each others is to use FTC. In this paper, by using FTC the effects of inlet position and baffle configuration on the hydraulic performance of primary settling tanks are studied. The best position of baffle is also determined.

Volume Subject Area:
Fluids Engineering
Topics:
Flow (Dynamics)
1.
Dobbins
W. E.
, “
Effects of turbulence on sedimentation
,”
Transactions, ASCE
, Vol.
109
, no.
2218
, pp.
629
–
656
,
1944
.
2.
Camp
T. R.
, “
Sedimentation and the design of settling tanks
,”
Transactions, ASCE
, Vol.
3
PP.
895
–
936
,
1946
.
3.
Larsen, P. and Gotthardson, S., ‘Om sedimenteringsgassangers hydraulic,’ Bulletin erie A. Nr. Inst. For Tekniks Vattenresurslare, Lund, Sweden (in Swedish), 1977.
4.
Imam
E.
and
Mc Corquodale
J. A.
, “
Numerical modeling of sedimentation tanks
,”
J. Hydraulic Eng. ASCE
Vol.
109
, No.
12
, pp.
1740
–
1754
,
1983
.
5.
Celik, I., Rodi, W. and Stamou, A.I., ‘ Prediction of hydrodynamic characteristics of rectangular settling tanks,’ Int. Symposium of Refined Flow Modeling and Turbulence Measurements, Iowa USA, 1985.
6.
Adams
E. W.
,
Rodi
W.
, “
Modeling flow and mixing in sedimentation tanks
,”
J. Hydraulic Engineering
, Vol.
116
, No.
7
, pp.
895
–
913
,
1990
.
7.
Rodi
W.
,
Adams
E. W.
and,
Stamou
A. L.
, “
Numerical modeling of flow and settling in primary rectangular Clarifiers
,”
J. Hydraulic Research
, vol.
27
, pp.
665
–
682
,
1990
.
8.
Stamou, A., Katsiris, I., Georgiadis, S., Kanellopoulou, S., Tzoumerkas, F. and Xenos, D., ‘Improving the efficiency of existing water process tanks using water process tanks using flow through curves (FTCs) and mathematical models,’ Int. Conf. on Environmental Science and Technology, Greece, 2001.
9.
Ashjari, M.A. and Firoozabadi, B., ‘Use of nonlinear k - ε in calculation of performance of settling tanks,’ Int. Conf. Mech. Engineering, Iran, 2002.
10.
Tamayol, A., Nazari, M., Firoozabadi, B. and Nabovati, A., ‘Effects of turbulent models and baffle position on hydrodynamics of settling tanks,’ Int. Mech. Eng. Con., Kuwait, 2004.
11.
Tamayol, A., Nazari, M., Firoozabadi, B. and Nabovati, A., ‘Numerical modeling and study of effects of inlet position and height of inlet baffle on the performance of settling tanks,’ Fluid Dynamics Conf., Iran, 2005 (In Persian).
12.
Fluent 5.2.3 User Manual, Fluent Inc.
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