Abstract
The problem of the motion of a swirling flow in a vortex chamber with particle deposition effects at the lateral surface is numerically investigated. Flowfields with formation of recirculation zones are analyzed on the basis of the Navier-Stokes equations. Two cases of the transport process for solid particles of different sizes with deposition on the lateral surface of the channel are studied (passive impurities are assumed). In the first case, the particles are injected into the peripheral part of the channel together with the swirling flow; in the second case, this process is performed through an annular slot without swirling. The results are compared with available experimental data and asymptotic solutions.
Highlights
Mathematical modeling of two-phase flows containing particles of different sizes is of practical importance for numerous industrial applications, such as the intensification of heat and mass exchange [1,2,3], the ecologically pure burning of fuel [4], the stabilization of combustion processes [5,6], and the spraying of aerosols [7]
The corresponding experimental device can schematically be represented as a long cylindrical channel of radius R; a gas swirling flow enters its peripheral part (Figure 1)
Under the action of the centrifugal force, the particles of the powder tend to the wall of the channel and are removed from the channel through a number of annular slots
Summary
Mathematical modeling of two-phase flows containing particles of different sizes is of practical importance for numerous industrial applications, such as the intensification of heat and mass exchange [1,2,3], the ecologically pure burning of fuel [4], the stabilization of combustion processes [5,6], and the spraying of aerosols [7]. The stability of the swirling axisymmetric flows is considered in [8,9,10,11,12]. Swirling flows are used to remove finely divided impurities from gases and to separate particles of powders by size [13,14]. The simplified convection-diffusion model is presented to describe particle transport and deposition
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