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Unsteady time-dependent incompressible Newtonian fluid flow between two parallel plates by homotopy analysis method(HAm),homotopy perturbation method(HPm)and collocation method(Cm)

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Propulsion and Power research 2018年第3期7卷 247-256页

作者： m.r.shirkhani H.A.Hoshyar I.rahimipetroudi H.Akhavan D.D.Ganji Department of mechanical Engineering Sari BranchIslamic Azad UniversitySariIran Young researchers Club Sari BranchIslamic Azad UniversitySariIran Department of mechanical Engineering Ghaemshahr BranchIslamic Azad UniversityGhaemshahrIran

Analytical and numerical analyses have performed to study the problem of the flow of incompressible Newtonian fluid between two parallel plates approaching or receding from each other *** Navier–Stokes equations have been transformed into an ordinary differential equation using a similarity *** powerful analytical methods called collocation method(Cm),the homotopy perturbation method(HPm),and the homotopy analysis method(HAm)have been used to solve nonlinear differential *** has been attempted to show the capabilities and wide-range applications of the proposed methods in comparison with a type of numerical analysis as fourth-order runge–Kutta numerical method in solving this ***,velocity fields have been computed and shown graphically for various values of physical *** objective of the present work is to investigate the effect of reynolds number and suction or injection characteristic parameter on the velocity field.

关键词： Homotopy analysis method(HAm) Collocation method(Cm) Homotopy perturbation method(HPm) Parallel porous plates Unsteady flow

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relationships between regulated DBPs and emerging DBPs of health concern in U.S. drinking water

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Journal of Environmental Sciences 2022年第7期34卷 161-172页

作者： Stuart W.Krasner Ai Jia Chih-Fen T.Lee raha shirkhani Joshua m.Allen Susan D.richardson michael J.Plewa metropolitan Water District of Southern California Water Quality LaboratoryCA 91750USA Department of Chemistry and Biochemistry University of South CarolinaSC 29208USA Department of Crop Sciences University of Illinois at Urbana-ChampaignIL 61801USA Safe Global Water Institute University of Illinois at Urbana-ChampaignIL 61801USA

A survey was conducted at eight U.S. drinking water plants, that spanned a wide range of water qualities and treatment/disinfection practices. Plants that treated heavily-wastewaterimpacted source waters had lower trihalomethane to dihaloacetonitrile ratios due to the presence of more organic nitrogen and HAN precursors. As the bromide to total organic carbon ratio increased, there was more bromine incorporation into DBPs. This has been shown in other studies for THms and selected emerging DBPs(HANs), whereas this study examined bromine incorporation for a wider group of emerging DBPs(haloacetaldehydes, halonitromethanes). moreover, bromine incorporation into the emerging DBPs was, in general, similar to that of the THms. Epidemiology studies that show an association between adverse health effects and brominated THms may be due to the formation of brominated emerging DBPs of heath concern. Plants with higher free chlorine contact times before ammonia addition to form chloramines had less iodinated DBP formation in chloraminated distribution systems, where there was more oxidation of the iodide to iodate(a sink for the iodide) by the chlorine. This has been shown in many bench-scale studies(primarily for iodinated THms), but seldom in full-scale studies(where this study also showed the impact on total organic iodine. Collectively, the THms, haloacetic acids, and emerging DBPs accounted for a significant portion of the TOCl, TOBr, and TOI;however, ~50% of the TOCl and TOBr is still unknown. The correlation of the sum of detected DBPs with the TOCl and TOBr suggests that they can be used as reliable surrogates.

关键词： Disinfection by-products Total organic bromine Total organic iodine Trihalomethanes Haloacetonitriles Haloacetaldehydes Iodo-trihalomethanes Iodoacetic acids

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