20.500.12556/RUL-114379 Transient flow of liquid in plastic pipes Prehodni kapljevinski tok v plastičnih ceveh Nowadays, plastic pipes play a key role in fluid conveyance, for example, in urban water supply systems. Dynamic analysis of designed water pipe networks requires the use of numerical methods that allow for solving basic equations that describe transient flows occurring in plastic pipes. In this paper, the main equations were formulated with pressure (p) and velocity (v) as the principal variables. A novel simplified retarded strain solution is used to properly model the pipe-wall viscoelasticity effect during transient flow process. Unsteady friction is calculated with the use of a filtered weighting function (with three exponential terms). The proposed numerical method enables the efficient modelling of transient flow in plastic pressurized pipes. Extensive simulations are performed and compared with experimental results known from three different European research centres (London, Cassino, and Lyon), with the aim of demonstrating the impacts of plastic pipe properties and frequency-dependent hydraulic resistance on transient pipe flow oscillations. The effectiveness of the proposed method for determining the creep functions of plastic pipes is also examined and discussed. plastic pipes viscoelasticity water hammer transient flow method of characteristics unsteady friction plastične cevi nestabilno trenje viskoelastičnost numerične metode true false true Angleški jezik Slovenski jezik Članek v reviji 2020-02-24 13:55:22 2020-02-24 13:55:27 2022-08-26 03:50:10 0000-00-00 00:00:00 2020 0 0 Str. 77-90 no. 2 Vol. 66 Feb. 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 519.61(045) 0039-2480 10.5545/sv-jme.2019.6324 17045019 762116 RAZ_Urbanowicz_Kamil_2020.pdf RAZ_Urbanowicz_Kamil_2020.pdf 1 E2F2AABCB47A0E27B707242E08B7CD1D 35f26a876a5157400149975246048827d79ec905b1bd45f51ab49c6712501418 346d9dc5-a1b8-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=126548 https://www.sv-jme.eu/sl/article/transient-flow-of-liquid-in-plastic-pipes/ 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=126547 Fakulteta za strojništvo Strojniški vestnik 0 0 0