Transactions of FAMENA, Vol. 42 No. 2, 2018.
Professional paper
https://doi.org/10.21278/TOF.42208
Numerical Simulation of a Pulsating Flow Generated in an Ejector
Vladas Vekteris
; Vilnius Gediminas Technical University, Department of Mechanical and Material Engineering, Vilnius, Lithuania
Andrius Styra
; Vilnius Gediminas Technical University, Department of Mechanical and Material Engineering, Vilnius, Lithuania
Vadim Mokšin
; Vilnius Gediminas Technical University, Department of Mechanical and Material Engineering, Vilnius, Lithuania
Irina Grinbergienė
; Vilnius Gediminas Technical University, Department of Mechanical and Material Engineering, Vilnius, Lithuania
Mindaugas Jurevičius
; Vilnius Gediminas Technical University, Department of Mechanical and Material Engineering, Vilnius, Lithuania
Vytautas Turla
; Vilnius Gediminas Technical University, Department of Mechatronic, Robotics and Digital Manufacturing, Vilnius, Lithuania
Gyula Mester
; Óbuda University, Doctoral School of Safety and Security Sciences, Budapest, Hungary
Abstract
This paper presents a numerical simulation of a pulsating flow generated inside an ejector; the flow is intended to oxidize ferrous iron (Fe2+) dissolved in drinking water to ferric iron (Fe3+). 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/m3, 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.
Keywords
pulsating flow ejector; acoustic field; numerical simulation; sound power
Hrčak ID:
203833
URI
Publication date:
16.7.2018.
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