Simulation of a Cyclone Separator using DPM Fluent (ANSYS Fluent) PDF

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Summary

Project done to simulate the working of a cyclone separator using the discrete phase mode DPM alongside with the K Epsilon RNG turbulent model to study the interaction between the solid particles and the continuous flow and calculate the particle collection efficiency....

Description

Activity Number: 2 Name: Rohit Narain Roll Number: 1802333 Aim of Activity (Title): Simulation of a Cyclone Separator using DPM Fluent. Problem Statement: Simulate the working of a cyclone separator using the discrete phase mode DPM alongside with the K Epsilon RNG turbulent model to study the interaction between the solid particles and the continuous flow and calculate the particle collection efficiency. Governing Equation: Overall Efficiency:

Where, mj=Mass fraction of the particles on the Jth particle size range. nj= Collection efficiency of particles on the Jth size range.

Boundary Conditions:  Two outlets were named as ‘Outlet1’ and ‘Outlet2’ which are located on the top and bottom part of the cyclone separator and one inlet surface located on the side of the cyclone. A steady state simulation was considered.  A gravitational acceleration of 9.81 m/s2 was applied in the downwards direction.  Viscous model (K-epsilon (2 eqn), RNG Model, Standard Wall Functions) was taken.  Velocity of the inlet particle was set to 3 m/s.  Diameter of the particle is 5x10-6 m.  Both Outlet1 and Outlet2 are kept at zero gauge pressure.  No Slip condition is applied an the walls. Solution Methods:  Pressure velocity coupling scheme was kept at SIMPLE.  In spatial discretization, → The gradient was set to ‘least square cell based’. → Pressure was kept at ‘Second Order’. → Momentum was set to ‘Second Order Upwind’. → Turbulent kinetic energy and Turbulent Dissipation Rate on ‘First Order Upwind’  1000 iteration were done for the calculations.

Result and Discussion: Mesh: Tetrahedron meshing is done with a mesh size of 5.5x10-2 m. Total of 5227 Nodes and 24619 Elements were created.

Top View

ISO View

Bottom View

The path of the particles can be seen in the below images:

Along with Vortex Core The Mass Flow from the Outlet1 was found to be -0.0276415 kg/s. The Mass Flow from the Outlet2 was found to be -0.00911359 kg/s. Conclusion: With the help of DPM Fluent a Cyclone Separator was simulated and studied....