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Effect of Geometric Parameters of Working Channel of Hydrodynamic Filter with Protective Baffle on Medium Flow Structure

Authors: Aleksandrov A.A., Devisilov V.A., Sharai E.Yu., Kiselyova D.A. Published: 12.04.2018
Published in issue: #2(77)/2018  
DOI: 10.18698/1812-3368-2018-2-23-38

 
Category: Mechanics | Chapter: Mechanics of Liquid, Gas, and Plasma  
Keywords: hydrodynamic filter, protective baffle, converging annular channel, mathematical simulation, flow structure, vortex formation

The purification of fluids from solid mechanical impurities remains one of the most important technical tasks from the viewpoint of ecological safety and reliability improvement of technical system operation. One of the most promising devices for cleaning fluids is the hydrodynamic filter, in which tangential filtration is combined with centrifugal separation during rotation of the filtering and protective cylindrical baffles. It is essential to study the effect of geometric parameters of the working channel of the hydrodynamic filter with a protective baffle on the medium flow structure. This allows us to determine the relationship between the regime and geometric dimensions of the filter, which ensures the maximum efficiency of centrifugal separation and the filter life at minimum costs. The study was carried out by mathematical modeling of the flow in the hydrodynamic filter with rotating protective and filtering baffles. The system of equations was constructed on the basis of Navier --- Stokes equations using the turbulence model k--ε. This paper studied the effect of geometrical design parameters of the filter on the vortex formation, the taper angle of the hydrodynamic filter housing and the width of the annular gap between the stationary housing and the rotating protective baffle. The results suggest that an increase in the width of the annular channel and the taper angle of the filter housing lead to the intensification of the circulation flow with the formation of secondary vortex structures. The velocity distribution in the hydrodynamic filter working channel is obtained for various geometric and regime parameters. Findings of the research show that in the considered range of regime and design parameters the rotation of the fluid between two baffles of the hydrodynamic filter is not analogous to the rotation of an absolutely rigid body. It is necessary to carry out similar studies for a two-phase disperse system to evaluate the use of the protective baffle for the separation efficiency. These analytical and experimental studies are the subject of the next stage of work on this issue

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