Two-phase flow in channels with non-circular cross-section of pneumatic transport of powder material

Abstract

The paper presents a numerical simulation of two-phase turbulent flow in straight horizontal channels of pneumatic transport with non-circular cross-section. For the granular flow simulation, we have chosen the flow of solid particles of quartz, flour, and ash in the flow of air, which is transporting fluid. During the modeling of the flow, the transported solid particles are reduced to spherical shapes. A correction of the stress model of turbulence is performed by taking into account the influences of the induction of secondary flows of the second order in the gas phase. The full Reynolds stress model was used for modeling the turbulence, and the complete model is used for the turbulent stresses and turbulent temperature fluxes. All numerical experiments were conducted for the same initial flow conditions and a single uniform grid was adopted for all numerical experiments. The flow is observed in a straight channel of a square cross-section and dimensions of sides of 200 mm and the length of 80 D h. During the simulation, the fineness of the numerical grid was also tested, and the paper shows results of the numerical grid of the highest resolution beyond which the fineness does not influence the obtained results. The paper offers graphics of velocities of the solid particles transported by the transporting fluid (air) along the channel.

Two-Phase Turbulent Flow in Straight Horizontal Channels With a Square Cross-Section Taking Into Account the Influence of Vertical Forces

“…For the need of results comparison between mono-phase and two-phase flow, the numerical simulations of mono-phase gas flow and two phase flow have been carried out for the same boundary conditions of gas phase flow but for several different solid particles dispersed in the gas flow, whereby the mesh density has been kept unaltered. Dominant parameters that influence the secondary flow of second kind are turbulent shear stresses in channel cross section, and they are chosen as parameters for two-phase flows comparison with different solid particles [25].…”

Simulation of flow in single and double-sided lid driven square cavities by direct simulation Monte Carlo method

“…The DSMC method can reasonably predict the flow and heat transfer aspects in all the flow regimes precisely, thus making it one of the most widely used approaches for large-scale rarefied gas simulations [34]. However, it entails specific constraints on the cell size, time step, particles per cell to ensure accuracy, and makes the DSMC method computationally expensive.…”

Numerical modeling of multiphase flow inside aeromixture channel and low emission burner of boiler OB-650

“…According to the previous research and examinations [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], preliminary analysis of discretization models has been conducted. The main parameters, that have been considered, were time of mesh generation, accuracy of the results, convergence, PC reassures and visual quality of obtained results.…”

“…So, particle flow is determinate with summarizing trajectories which cross observed control volume. [4,17]…”

“…The same analysis has shown better superposition of numerical results with experimental measurements when Lagrangian approach is used. Milanović, in his PhD dissertation, [4] investigates turbulent multiphase flow in the straight channels of non-circular section. Živković et al in their paper [5] and S. Atas et al in [6] investigate the impact of dumpers and granulation of pulverized coal on the separation and the dispersion of coal particles over the burners in power plant, by CFD analysis.…”