<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>An investigation has been carried out using the FLUENT Computational Fluid Dynamics (CFD) software, which uses the finite-volume method to determine whether it is feasible to improve the capacity and quality of the clarifier at the Al-Wathba Water Treatment Works (Iraq) by some relatively inexpensive means. Simulations were carried out with two dimensional, radially symmetric models, representing the existing configuration as well as a number of proposed modifications involving baffles and additional clarified water off-takes. A convection-diffusion equation, which is extended to incorporate the sedimentation of sludge flocs in the field of gravity, governs the mass transfer in the clarifier. The standard <italic>k</italic>-ε turbulence model is used to compute the turbulent motion, and our CFD model accounts for buoyancy flow. The sludge settling velocity was measured as a function of the concentration, and we have used the double-exponential settling velocity function to describe its dependence on the concentration. The CFD model is validated using measured concentration profiles. The results were evaluated on the basis of the simulated profiles of vertical up-flow velocity in the body of the clarifier.</p></abstract>

An investigation has been carried out using the FLUENT Computational Fluid Dynamics (CFD) software, which uses the finite-volume method to determine whether it is feasible to improve the capacity and quality of the clarifier at the Al-Wathba Water Treatment Works (Iraq) by some relatively inexpensive means. Simulations were carried out with two dimensional, radially symmetric models, representing the existing configuration as well as a number of proposed modifications involving baffles and additional clarified water off-takes. A convection-diffusion equation, which is extended to incorporate the sedimentation of sludge flocs in the field of gravity, governs the mass transfer in the clarifier. The standard k-ε turbulence model is used to compute the turbulent motion, and our CFD model accounts for buoyancy flow. The sludge settling velocity was measured as a function of the concentration, and we have used the double-exponential settling velocity function to describe its dependence on the concentration. The CFD model is validated using measured concentration profiles. The results were evaluated on the basis of the simulated profiles of vertical up-flow velocity in the body of the clarifier.

Improvement performance of Al-Wathba settling tank by a computational fluid dynamics model

Faculty of Civil Engineering, Department of Sanitary and Environmental Engineering, Slovak University of Technology, Radlinského 11, 813 68 Bratislava, Slovakia

College of Engineering Department of Civil Engineering, Al-Qadissiyia University, Iraq

Journal of Hydrology and Hydromechanics

An investigation has been carried out using the FLUENT Computational Fluid Dynamics (CFD) software, which uses the finite-volume method to determine whether it...

Improvement performance of Al-Wathba settling tank by a computational fluid dynamics model

Online veröffentlicht: 26. Aug. 2010

Seitenbereich: 201 - 210

DOI: https://doi.org/10.2478/v10098-010-0019-8

Schlüsselwörter
počítačová simulácia prúdenia kvapalín, úprava vody, číriče, usmerňovače, kvalita vody

This content is open access.

Improvement performance of Al-Wathba settling tank by a computational fluid dynamics model

Online veröffentlicht: 26. Aug. 2010

Seitenbereich: 201 - 210

DOI: https://doi.org/10.2478/v10098-010-0019-8

Schlüsselwörterpočítačová simulácia prúdenia kvapalín, úprava vody, číriče, usmerňovače, kvalita vody

This content is open access.

Schlüsselwörter
počítačová simulácia prúdenia kvapalín, úprava vody, číriče, usmerňovače, kvalita vody