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Publikācija: Interpretation of Loose Deposits Motion in Drinking Water Distribution Network

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Nosaukums oriģinālvalodā Interpretation of Loose Deposits Motion in Drinking Water Distribution Network
Pētniecības nozare 2. Inženierzinātnes un tehnoloģijas
Pētniecības apakšnozare 2.1. Būvniecības un transporta inženierzinātnes
Autori Kaspars Neilands
Jānis Rubulis
Atslēgas vārdi bend, local hydraulic losses, loose deposits, unidirectional flushing, tee, turbidity curve
Anotācija The present study was designed to describe the turbidity curve obtained during planned unidirectional flushing in drinking water distribution system of a diameter 100-300 mm. The online measurements of flow and turbidity for cast iron (n=16), polyethylene (PE, n=7) and polyvinylchloride (PVC, n=4) pipe sections and calculations of hydraulic values indicated that the turbidity curve peaks appeared at the locations of bends, tees, narrow parts of the pipes etc viz. where increased hydraulic drops take place. The applcation of on-line measurements during the wash-out of loose deposits in both cases from one and two hydrants simulataneusly, the calculations of average velocity (0.72 m/s, n=22) and shear stress (2.05 N/m2, n=29) on pipe walls showed that the loose deposits in the pipes move according to plug-flow principle in a turbulent regime. The granulometric analysis of loose deposits showed that the average diameter ranged from <1-558.4 μm (n=16) and did not correspond to the cohesive nature and average surface area of loose deposits which was 48.864 m2/g (n=17) with lowest values for samples of PE and PVC pipe sections (1.684 m2/g) and highest for CI sections - 148.991 m2/g. The analysis of X-ray crystalline phases of loose deposits indicated the predominance of goethite and quartz. The observations of peaks from turbidity curves fitted for junctions of pipe network are significant for modeling of loose deposit discoloration events in distribution network.
Hipersaite: http://ascelibrary.org/doi/abs/10.1061/41203%28425%2961 
Atsauce Neilands, K., Rubulis, J. Interpretation of Loose Deposits Motion in Drinking Water Distribution Network. No: 12th Annual Water Distribution Systems Analysis Conference, Amerikas savienotās valstis, Tucson, 12.-15. septembris, 2010. Tucson: American Society of Civil Engineers, 2010, 1.-12.lpp. e-ISBN 978-0-7844-1203-9.
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  • Scopus  0
ID 8023