| Original language | English |
|---|---|
| Article number | 2470 |
| Journal | Water (Switzerland) |
| Volume | 12 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published (VoR) - Sept 2020 |
Funding
Numerical modelling and simulation study based on the experimental results are carried out by at the first pressure test point is obvious, which forms a crest. However, the shear force of four FLUENT to evaluate the performance of two-phase flow flushing method for removal of the “growth monitoring points dropped sharply at the time of stopping the air inflow. ring”. The simulation results match the experimental results. Pressure, water-phase flow velocity and The severe fluctuation of the shear force at the tangential direction of the pipe makes the air–water water-phase volume ratio distributions in a section of pipe are simulated and analysed. Within the two-phase flow flushing method its unique advantage, which can efficiently clean the water supply first 4 s air inflow time, the pressure and water-phase velocity in the pipe gradually increase along pipeline with less water consumption and flushing time. the direction of water flow (the positive direction of the X-axis). After 4 s, the air inflow stops and the 4.Conclusionspressure and water-phase velocity in the pipe gradually decreases until the end of the 10 s period. The air–water two-phase flow flushing process is a slug flow with severe turbulence. The shear force against time in a period is obtained and analysed. There is severe fluctuation of the shear force at the tangential direction of the pipe for efficient removal of the “growth ring” in the water pipe. This study suggests that elbow pipes cause flushing energy loss, and, therefore, at most one section of elbow water-phase volume ratio distributions in a section of pipe are simulated and analysed. Within the first 4 s air inflow time, the pressure and water-phase velocity in the pipe gradually increase along the direction of water flow (the positive direction of the X-axis). After 4 s, the air inflow stops and the pressure and water-phase velocity in the pipe gradually decreases until the end of the 10 s period. The air–water two-phase flow flushing process is a slug flow with severe turbulence. The shear force agaiCn.sFt.,tRim.Te.;iInnvaespteigraiotidoni,sXo.bHt.a;iMneetdhoadnodloagnya,lXy.sHe.d; .PrTohjeecrteaidsmseinviestrreatfilounc,tJu.La.t,iCon.F.o,fRt.hT.e;Rsheseoaurrfcoersc, eWa.Wt t.h, eM.Z.; tangSeunpteiarvlidsiiorenc,tWion.Wo.f, Mth.eZp.,iJp.Le.,foCr.Fe.f,fiRc.iTe.n; tVraelmidoatvioanl,oRf.tTh.e; W“grriotiwngt—h roirniggi”nainl dthraeftw, Zat.Ter.; pWipriet.inTgh—isresvtuiedwyand suggests that elbow pipes cause flushing energy loss, and, therefore, at most one section of elbow pipe is flushed in one flushing period for the best cleaning results. In conclusion, this research establishes a new way to potentially use numerical modelling and simulation results to guide pipe engineers to effic5i1e6n0t5ly48a5n,danedffe1c1ti5v7e5l1y18fl),usShhewnzahteerndSisciternibcue tiaonndpTipecehlinoelos.gy Project (Grant Nos. JCYJ20170817100658231, JCYJ20180305124317872, JCYJ20180507182106754, and JCYJ20180507182439574), China Postdoctoral Science Author Contributions: Conceptualization, Z.T., W.W., M.Z.; Formal analysis, X.H.; Funding acquisition, J.L., C.F., R.T.; Investigation, X.H.; Methodology, X.H.; Project administration, J.L., C.F., R.T.; Resources, W.W., M.Z.; SupeCrvoinsfiolinc,tsWo.Wf I.n, Mte.rZes.,tJ:.LT.h,eC a.Fu.,thRo.Tr.s; dVeaclildaareti onno,cRo.nT.f;liWctroitfi ningt—eroersitg.inal draft, Z.T.; Writing—review and editing, Z.T., W.W., M.Z., R.T. All authors have read and agreed to the published version of the manuscript. Funding:ReferThisencersesearch was funded by National Key Research and Development Programme of China (Grant No. 2016YFB0402705), National Natural Science Foundation of China (NSFC) (Grant Nos. 11704261, 11974252, 51605485, and 11575118), Shenzhen Science and Technology Project (Grant Nos. JCYJ20170817100658231, JCYJ20180d3e0g5r1a2d4a3t1io7n87o2f, trJiCchYlJo2r0o1e8t0h5y0l7en18e2 b1y06F7e5n4t,ona-nlidkeJ CreYaJc2t0io1n8.0W50a7t1e8r224031985,7140),,1C37h6in. a Postdoctoral Science Foundation (Grant No. 2019M653018).
Keywords
- Growth ring
- Pipeline cleaning
- Two-phase flow
- Water distribution
- Water quality