Turbulence intensity in the vortex settling tank

• Autorzy: Krukowski Marcin , Rusjan Anna , Kiczko Adam , Siwicki Piotr , Kozioł Adam

Identyfikatory

DOI

10.5604/01.3001.0054.6308

• Języki publikacji: EN

Abstrakty

EN

Experimental research was undertaken to investigate changes in flow velocity and turbulence intensity in a vortex settling tank as a result of increasing flow rate. Two studies were conducted for two different flow rates through the settling tank. The changes in the flow turbulence structure were analysed at two depths of the settling tank based on the measured instantaneous flow velocities. The instantaneous velocities were measured using a three-component acoustic Doppler velocity meter. Changes in values and distributions of velocity and turbulence intensity in the vortex settling tank were presented. It was observed that a twofold increase in flow caused an up to a threefold increase in the average flow velocity near the settling tank walls, a twofold increase in the turbulence intensity near the settling tank walls, and an increase in zones of local turbulence. In these zones, the increase in the gradient of turbulence intensity values is much greater than in the others. The zone of turbulence with maximum values occurs on the left side of the settling tank near the outlet deflector. The presented changes in the turbulence structure negatively affect the efficiency of the settling tank by increasing the values of velocity and turbulence intensity.

Słowa kluczowe

EN

vortex settling tank; turbulence intensity; velocity

• Wydawca: Szkoła Główna Służby Pożarniczej
• Czasopismo: Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej
• Rocznik: 2024
• Tom: Nr 90 (tom 1)
• Strony: 131--144
• Opis fizyczny: Bibliogr. 13 poz., rys., tab.

Twórcy

autor

Krukowski Marcin

• Warsaw University of Life Sciences, Institute of Environmental Engineering, Warsaw, Poland

• https://orcid.org/0000-0002-4010-7916

autor

Rusjan Anna

• Warsaw University of Life Sciences, Institute of Environmental Engineering, Warsaw, Poland

autor

Kiczko Adam

• Warsaw University of Life Sciences, Institute of Environmental Engineering, Warsaw, Poland

• https://orcid.org/0000-0003-0213-2413

autor

Siwicki Piotr

• Warsaw University of Life Sciences, Institute of Environmental Engineering, Warsaw, Poland

• https://orcid.org/0000-0002-3097-8662

autor

Kozioł Adam

• Warsaw University of Life Sciences, Institute of Environmental Engineering, Warsaw, Poland

• https://orcid.org/0000-0002-4059-8639

Bibliografia

• 1. Buffin-Bélanger, T., Roy, A.G., (2005). 1 Min in the Life of a River: Selecting the Optimal Record Length for the Measurement of Turbulence in Fluvial Boundary Layers. Geomorphology, 68, 77–94. http://dx.doi.org/10.1016/j.geomorph.2004.09.032
• 2. Cheremisinff, N.P., (2002). Handbook of Water and Wastewater Treatment Technologies, An Overview of Water and Water Treatments, Butterworth-Heinemann Publication, pp. 1–60.
• 3. Elsner, J., (1987). Turbulencja przepływów. Warsaw: PWN.
• 4. He, C., Chittibabu, P., Nguyen, D., (2022). Investigating the Effectiveness of Vortex- Enhanced Particle Settling in a Hydraulic Separator Using Physical Modeling. Journal of Environmental Engineering, Volume 148, Issue 6, pp. 55–66. https://doi.org/10.1061/(ASCE)EE.1943-7870.0002004
• 5. Jover-Smet, M., Martín-Pascual, J., Trapote, A., (2017). Model of suspended solids removal in the primary sedimentation tanks for the treatment of urban wastewater. J. Water (Switz.), 9(6), p. 448, https://doi.org/10.3390/w9060448
• 6. Kiss, K., Patziger, M., (2013). Novel measurements in primary settling tanks of large municipal wastewater treatment plants. YBL Journal Built Environ., 1. http://dx.doi.org/10.2478/jbe-2013-0001
• 7. Lim, M.T.N., Lam, S. W., Amal, R., Cathers, B., Pinson, D., (2012). Computational and Experimental Studies of Floc Behaviour in a Vortex Separator. Global Solutions for Urban Drainage: Proceedings of the Ninth International Conference on Urban Drainage, 1–14. https://doi.org/10.1061/40644(2002)303.
• 8. Markowska, M., Fus, A., Włodarczak, S., Kruszelnicka, I., Ochowiak, M., (2018). Symulacje CFD procesu separacji układu ciało stałe-ciecz w zmodyfikowanych osadnikach wirowych. Inżynieria i Aparatura Chemiczna, no 6, pp. 170–171.
• 9. Markowska, M., (2021). Analiza procesu separacji ciało stałe-ciecz i ciecz-ciecz w zmodyfikowanych osadnikach wirowych. Doctoral dissertation. https://sin.put.poznan.pl/dissertations/details/d2942. [14.05.2024]
• 10. Ochowiak, M., Matuszak, M., Włodarczak, S., Ancukiewic,z M., Gościniak, A., (2016). Badania sprawności oczyszczania strumienia wód opadowych w osadnikach-piaskownikach wirowych. Inż. Ap. Chem., 55(5), 1.
• 11. Ochowiak M., Markowska M., Matuszak M., Włodarczak S., (2018). Analiza pracy zmodyfikowanego separatora wirowego. Inż. Ap. Chem., 57(1), 12–13.
• 12. Tarpagkou, R., Pantokratoras, A., (2013). CFD methodology for sedimentation tanks: The effect of secondary phase on fluid phase using DPM coupled calculations. J. Appl. Math. Model, 37(5), 3478–3494. https://doi.org/10.1016/j.apm.2012.08.011
• 13. Roszczyk, K., (2021). Wykorzystanie modelowania CFD do wyznaczenia skuteczności działania urządzeń ograniczających zanieczyszczenia w spływach opadowych. Master’s thesis. Typescript.