Applying Computational Fluid Dynamics Modelling for Investigating Conical Reverse-Flow Cyclone Skai iuojamosios fluid dinamikos modeliavimo taikymas kūginiam gr tamojo srauto ciklonui tirti

The problem of the efficiency of cyclones, devices for separating heavy particles from their carrying fluid, is examined. A review of experimental and theoretical papers is conducted introducing three dimensional differential equations for transfer processes and the Reynolds stress model of turbulence. The paper describes the numerical modelling of the swirling fluid flow in the conical reverse-flow cyclone the height of which is 0.50 m and diameter – 0.20 m. The governing fluid flow equations are solved using the finite volume method in a body-fitted coordinate system. A reasonable agreement between the presented results of numerical calculations (inlet velocity - 4.64 m/s and fluid flow rate - 0.28 m3/s) and experimental and numerical data obtained by other authors is found (mean relative error did not exceed ± 5%). Article in Lithuanian Nagrin jama ciklon , skirt kietosioms dalel ms atskirti i oro srauto, efektyvumo problema. Ap velgti eksperimentiniai ir teoriniai darbai. Pateiktos trimat s perna os diferencialin s lygtys su Reinoldso tempi turbulencijos ir kitais modeliais. Atliktas skaitinis oro srauto jud jimo modeliavimas kūginiame gr tamojo srauto (KGS) ciklone, kurio auk tis – 0,50 m, cilindrin s dalies auk tis - 0,29 m, kūgin s - 0,133 m, skersmuo - 0,20 m. Modeliuojant apra ytas oro srauto jud jimas ciklone taikant Navj ir Stokso trima i diferencialini lyg i sistem , diskretizuot baigtiniais tūriais. Modeliavimo rezultatai, kai tek jimo greitis – 4,64 m/s ir debitas – 0,28 m3/s, neblogai sutapo su kit autori vykdyt eksperiment rezultatais. Gauta vidutin santykin paklaida - ±5 proc. Straipsnis lietuvi kalba