Sedimentation Tanks for Treating Rainwater: CFD Simulations and PIV Experiments

Energies

Andżelika Krupińska¹  Sylwia Włodarczak¹  Marek Ochowiak¹  Michał Hyrycz¹  Tomasz Zawilski¹  Magdalena Matuszak¹  Leszek Dudek¹  Ivan Pavlenko²  Krystian Czernek³  Stanisław Witczak³  Daniel Janecki⁴ 

[1] Department of Chemical Engineering and Equipment, Poznan University of Technology, 60-965 Poznan, Poland;Department of Computational Mechanics Named after V. Martsynkovskyy, Sumy State University, 2, Rymskogo-Korsakova St., 40007 Sumy, Ukraine;Faculty of Mechanical Engineering, Opole University of Technology, 45-758 Opole, Poland;Institute of Environmental Engineering and Biotechnology, University of Opole, 45-032 Opole, Poland;

关键词: CFD;    PIV;    rainwater treatment;    sedimentation tank;    swirl motion;   

DOI  :  10.3390/en14237852

来源: DOAJ

【 摘 要 】

The removal of solids is the most important step when treating rainwater. The article evaluates two designs of sedimentation tanks that can be used for the continuous separation of fine particles from water: OS—standard sedimentation tanks, and OW—swirl sedimentation tanks. The tanks were studied by conducting computational fluid dynamics (CFD) modeling and particle image velocimetry (PIV) experiments. The settling process in sedimentation tank was carried out at varying operating flow rates. A tank with a modified structure was used for the tests, where water was supplied by a nozzle placed at an angle. This solution made it possible to obtain a rotational flow that transported the suspended particles towards its wall, where downward axial velocity resulted in the settling of particles. Based on the research, it was observed that the flow patterns showed inward flow at the bottom of the tank and an upward flow and the lifting of the settled particles near the hatch at the bottom. The presented experimental measurements provided detailed insight into flow patterns, and valuable calibration and verification data for further CFD modeling. Traditional PIV techniques are useful in the case of standard design, whereas CFD is invaluable for supporting this work and for investigating the design of novel sedimentation tanks.

【 授权许可】

Unknown