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In this work, a shear-driven two-phase particulate flow of monodispersed and polydispersed granular materials has been studied experimentally and numerically as a function of solids concentration and restitution coefficients for different operating speeds N (70 -130 rpm) in a lab-scale rotor-stator agglomeration reactor. A coupled computational flu...
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... different grid sizes were generated using the ANSYS Mesher, after which a sensitivity analysis was performed to determine an optimal grid size. Thereafter, a high-quality hexahedral mesh of approximately 431,000 cells (mesh 2) was selected for the numerical simulation based on the sensitivity analysis shown in Fig. 2. Table 2 gives a quantitative measure of the mesh quality for all the grid sizes considered. Monodispersed sand and polydispersed ballotini particles were selected as model granular materials for the particle tracking calculations. ...Context 2
... 3 shows a summary of the phase properties and the particle injection schemes for the DPM calculations. (kgm -3 ) 998 Dynamic viscosity (kgm -1 s -1 ) 8.94×10 -4 Temperature (°C) 25 Discrete phase Case 1: Mono-sand Case 2: Poly-ballotini aximum particle size ( m) -20 Mean particle sizes ( m) 2, 6, 10 2, 6, 10 inimum particle size ( m) -1 Particle density (kgm -3 ) 2650 2500 Particle shape Spherical Spherical Number of injected particles (-) 3.6×10 6 , 7.2×10 6 1.25×10 7 , 2.5×10 7 Solids volume fractions (-) 8.2×10 -6 , 1.6×10 -5 8.7×10 -6 , 1.7×10 -5 Particle injection type Surface Surface Total injection time (s) 0.005, 0.01 0.005, 0.01 Phase coupling scheme One-way One-way Mixing speeds (rpm) 70 -130 70 -130 Particle restitution coefficients (-) 0.20-0.99 0.20-0.99 ...Similar publications
The shear strength is a fundamental property of soil material. The measurement of the shear strength of unsaturated soils is challenging. Several tests are necessary to establish the strength variation with matric suction, and a long time is required to achieve the matric suction equilibrium in specimens before testing. Predictive models can evalua...
Citations
... Eddy-particle interactions often play a crucial role in these processes and it is largely the dominant driver of mass and momentum transfer. In studying the dynamics of such complex interplay of forces, a good knowledge of the vortex dynamics and its influence on the fluid and particle dynamics is highly indispensable [3,4]. ...
... Eqs. (4) Table 1. ...
... (8)). Depending on the flow scenario, the particles in suspension will experience additional forces such as the drag, lift, pressure gradient, virtual mass, basset, and viscous stress forces due to the fluid-particle interactions [4,24]. Taken together, all these forces will ultimately determine the trajectory, dynamics, and fate of particles in suspension. ...
This work presents a short review of the theoretical developments in the application of vortex dynamics to the processing of environmental and biological systems. The mechanisms of complex fluid-particle interaction in vortex dominated and non-vortex dominated flows are briefly discussed from theoretical and practical perspectives. Micro vortex propagation, characteristics and their various applications in environmental process engineering are briefly discussed. Several existing and potential applications of vortex dynamics in turbulent flows are highlighted and as well as the knowledge gaps in the current understanding of turbulence phenomenon with respect to its applications in the processing of solid-liquid suspension and biological systems.
