SummaryThis paper presents a numerical simulation of a pulsating flow generated inside an ejector; the flow is intended to oxidize ferrous iron (Fe 2+ ) dissolved in drinking water to ferric iron (Fe 3+ ). The pulsating flow ejector can be used in water treatment systems where the water is saturated with oxygen before being treated by filters. It is shown that the pulsating flow is generated due to fluctuations in the pressure, density, and velocity of the flow inside the ejector. It is established that the flow pressure inside the ejector varies from 0.513 to 0.0719 MPa, the flow density varies from 4.64 to 0.66 kg/m 3 , and the flow velocity varies from 0 to 590 m/s. Numerical simulation results have shown that an acoustic field is generated inside the ejector during the mixing of air with water, which accelerates the coagulation of iron particles. The obtained sound power level value of 100 dB shows that the pulsating flow ejector can be used for non-reagent water treatment.
A number of modern iron removal systems used in individual houses do not work properly. One of the reasons could be inappropriate work of the aeration system. Therefore, the aim of this research is to analyze three types of jet pumps used in individual houses in Lithuania and compare the amount of sucked oxygen with demand for dissolved oxygen the amount of which is calculated. When summarizing the results of research, it was discovered that the ejector worked unstable when flow was low, and therefore stable operation require additional pressure.
The article deals with changes in the density of pulsating water and air flow generated in pulsating flow ejector. Transformation of the fluid motion equation to Lighthill’s equation describing density change and acoustic radiation of the flow is presented. Calculation results demonstrate suitability of the ejector to cause acoustic agglomeration and effectively remove iron particles from potable water.
ČIURKŠLINIO SIURBLIO pULSUOjaNČIO SpIRaLINIO SūKURIO fORmavImaS IR tyRImaS vladas vekteris 1 , andrius Styra 2 , vytautas Striška 3 Vilniaus Gedimino technikos universitetas El. paštas: 1 vladas.vekteris@vgtu.lt; 2 andrius.styra@vgtu.lt; 3 vytautas.striska@vgtu.ltSantrauka. Straipsnyje tyrinėjamas spiralinio sūkurio formavimas ir taikymas skysčio aeratoriuose. Vizualiniu metodu išbandytos trys naujos srautinių čiurkšlinių siurblių konstrukcijos. Parodyta, kad čiurkšliniu siurbliu su menteliniu skysčio užsukimu, esant tam pačiam darbinio srauto debitui, sukuriamas didžiausias siurbiamo skysčio sąlyčio paviršius. Pastebėta, kad mentelinio čiurkšlinio siurblio fakelo forma artima spiralinio sūkurio formai, kuri sukuria srauto pulsacijas, pagerinančias deguonies tirpumą skystyje.Reikšminiai žodžiai: aeravimas, čiurkšlinis siurblys, spiralinio sūkurio forma, srauto fakelas.
RESEaRCH aND fORmatION Of tHE WHIRLING vORtEX Of tHE jEt pUmp v. vekteris, a. Styra, v. Striška
AbstractThis article explores the formation of spiral vortex and application of liquid aerators. Visually, the new method has been applied for three structures of the stream ejector. The paper shows that under the same traffic flow, the venturi tube with blade cup liquid creates maximum ejected liquid contact surface. It has been noticed that the flared shape of the ejector blade that is close to the form of the spiral vortex, creates improvements in a pulsation flow and thus increases the solubility of oxygen in the liquid.
Santrauka. Lietuvos pozeminiame vandenyje gelezis jTa svarbiausias komponentas, pazeidziantis geriamojo vandens kokybés normatyvinius reikalavimus, todél tiriamas akustinio lauko naudojimas sioms daleléms sukibti skystyje. Siuo metu garso virpesiai yra placiai taikomi ¡vairiose pramonès sakose: metalurgijoje, chemijos ir maisto pramonéje, gaminant jrenginius ir medicinoje. Akustikos naudojimas oksidacijos proeesui vandenyje sustiprinti, nusodinant stambi^sias priemaiSas, dar labiau isplecia sio fizikinio método taikjmio sritj.ReikSminiai zodziai: akustinis laukas, garso daznis, koaguliacija.
{vadas
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.