We deal with the multiphase flow and their increasing application in mechanical and engineering systems. Therefore, to have more efficient operations, we must have a complete understanding of such flows. Multiphase flows are classified into different groups, one of which is the dispersed multiphase flow that is common in engineering systems. Dispersed multiphase flows include bubble flow, droplet flow, and particle flow. In this flow, a phase is considered to be the carrier phase, in which the particles, bubbles, and droplets are dispersed and form the other phases. CFD simulation plays a prominent role in optimizing the design of systems with the dispersed multiphase flow. ANSYS CFD is a powerful tool in this field.
In addition to solving transition equations for a continuous phase, ANSYS Fluent allows us to simulate a discrete second phase in the Lagrangian reference frame. This second phase consists of spherical particles (which may represent droplets or bubbles) dispersed in a continuous phase. The ANSYS Fluent calculates the paths of discrete-phase entities, as well as the heat and mass transfer. The connection between the phase and its effect on both discrete phase paths and continuous phase flow can be included.
In this analysis, we tried to simulate and analyze the flow of a particle absorption mechanism called the discrete phase trap, applying the ANSYS Fluent software using the Discrete Phase model (DPM).
The geometry required to analyze the discrete flow path of a trapper includes a specially designed compartment, all designed in ANSYS Design Modeler software, and the meshing is done by ANSYS Meshing software for this geometry. The meshing generated for this geometry is unstructured and the total number of cells created for this geometry is 420485.
For analysis of particle absorption process and particle simulation in this project, the Discrete Phase Model has been used. In this model, the physical models of Saffman Lift Force and Pressure Gradient Force are used. In this analysis, the Surface Injection method has been used for entering the particles in the domain. The particle density, diameter, velocity, and other particle-specific properties are also included in this model. To analyze the turbulence of the flow generated by the interaction of this two-phase flow, the K-epsilon STANDARD turbulence viscosity model is used. The standard wall function is used near the wall.
The materials used in this analysis also include air, chamber wall, and particle properties, are defined in the Material section for this analysis.
The flow input for this analysis is defined as Velocity Inlet for input air and is equal to 5 m/s. The walls of the chamber are defined as walls and are described as reflections for particles with a wall. The trapping area is also defined as a wall, defined for trap particles for collision with it.
The Simple algorithm is used to solve the equations in this analysis. Also, a pressure-based solution for flow is used. The Green-Gauss Node Based method is used to determine the flow characteristics gradient in this discrete equation. The second order is used to discretize the pressure equations.
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