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• W306582020 abstract "along the axis of the jet has been found. At a certain distance from the pipe exit from which the jet flowed, near the axis of the jet, regions with a volume concentration exceeding its initial value were recorded. An analysis of such a variation of the volume concentration of the particles in a two-phase jet has been carried out by a number of investigators, but, as a rule, only one of the possible reasons for the local increase of the concentration was considered in their papers. An attempt is made in this paper to generalize the existing data with allowance for the theoretical investigations carried out by the authors, in order as far as possible to explain more fully the nonmonotonic variation of the volume concentration of the particles along the axis of a jet. One of the reasons for the nonmonotonic variation of the volume concentration of the particles along the axis of a twoiphase jet is the particle deceleration along the jet [2]. In fact, the velocity of the gas in the jet decreases as it moves away from the nozzle, and this results in a decrease of the axial velocity of the particles. At the same time, as the particles move along the axis of the jet, the distance between them decreases (the preceding particles move with a lower velocity than the following particles due to their deceleration) and this leads to a local increase of the volume concentration of the discrete phase. Alongside the particle deceleration, the variation of the volume concentration of the particles is strongly influenced by turbulent diffusion [2], as a consequence of which the particles are dispersed in the radial direction and, consequently, the concentration of the discrete phase in the jet decreases. Therefore, the dependence of the volume concentmation of the particles on the longitudinal coordinate can be monotonic if diffusion predominates, and nonmonotonic if particle deceleration predominates in a certain region. Because the experimental data are limited, a detailed analysis of the influence of different factors on the variation of the volume concentration of the particles in a two-phase jet is possible only by using the results of theoretical calculations, for example, those described in [3, 4] and those based on the solution of a system of equations of a two-phase jet [5]. The maximum volume concentration of the particles in the jet and the character of its variation along the axis of the jet depend to a significant extent on the initial values of the �9 density, the volume concentration and the diameter of the particles, the slip of the phases, the nozzle diameter, and the form of the initial fields of the phase parameters of the jet [3, 4]. The variation of the particle diameter has a particularly strong influence on the monotonicity of the variation of the concentration of the discrete phase in the jet. Curves 1-3 in Fig. I show the variation o~ the volume concentration of the discrete phase along D. ~ = 0.2 the axis of the jet for the three relative values of the particle diameter: ,x 10 -3 , i0 -3, 5,10 -3 , respectively. Here, by the relative particle diameter, Di, we understand the ratio of the particle diameter to the nozzle radius. The dimensionless coordinate x* is the ratio of the x coordinate to the nozzle radius r c. Curve 4 in Fig. 1 shows the variation of the velocity of the gas and curve 5 shows the variation of the particles along the axis of the jet with the particles D i = 10 -3 The dimensionless initial parameters of the jet in this calculation were selected as follows: the fields of all the phase parameters in the initial section of the jet are uniform, v~=u~/u=i, ci=i.23iO-~ p*=p/p~=i.23.10 -3, Be=paD~/~=175 (p, u, and ~/ are the density, the velocity, and the dynamic viscosity of the gas, Pi and u i are the density and velocity of the particles," @default.
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• W306582020 date "2004-01-01" @default.
• W306582020 modified "2023-09-27" @default.
• W306582020 title "In an experimental investigation of a turbulent gas jet with an admixture of solid particles (1), nonmonotonic variation of the volume concentration of the discrete phase" @default.
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