Abstract. The improvement of the methods for calculating the efficiency for particles separation in these devices is the subject of article. Finding data show that the particles are discharged from the central zone to periphery by diffusive transport in the zone of high centripetal accelerations. It is found that the central zone is the ejection effect zone on the paraxial flow and intense discharge particle zone. The concentrations distribution and distribution of fractional efficiencies are presented.Cyclone devices are a major element in the gas dusting systems in the production of energy, chemicals and other industries. However, the improvement of the methods for calculating the efficiency for particles separation in these devices is the subject of many studies [1] till now. In practice the method for estimating the fractional separation efficiency by integral of the random variable probability is widely accepted [2]. In work [3] it is shown that introduction of dust particles in the wall zone does not guarantee their introduction into the dust collecting bag and theirs 100% trapping. Ter Linden [4] plotted curves of particles separation equal efficiency. These particles introduced into the various points of the separation volume. It turned out that these curves pass through the point on the axis, i.e. the particles, which introduced below the entry section of the output channel on the axis, trapped with the same efficiency that the particles, which introduced at the periphery. According Kizin [3] the particles, which introduced in the upper axis point of the conical part, trapped more efficiently than the particles introduced into the peripheral zone of the cyclone upper part.Mentioned data show that the particles are discharged from the central zone to periphery by diffusive transport in the zone of high centripetal accelerations, that is located in the vicinity of radius Rm < R1 − the radius of the discharge connection. The vicinity of radius Rm is a transition zone from the quasisolid rotation of the gas to the quasipotential. It is found that the central zone is the ejection effect zone on the paraxial flow and intense discharge particle zone. Turbulence intensity in this zone reaches more than 40%, whereas turbulence intensity in straight channels does not exceed 2%. The arrival process of highly concentrated flow in receiver along the periphery as well as outflow process of low concentration flow from receiver in the paraxial zone is explained by the ejection effects.In counterflow cyclone in each cone section the flows are directed upwards towards gaz-discharge connection in the paraxial zone and they are directed down towards dust-excretive channel in a a
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