Revolving Rice Dryer Using DPM CFD Simulation
Price: $240
In this project, a revolving rice dryer using one-way DPM has been simulated and the results of this simulation have been investigated.
Revolving Rice Dryer Using DPM CFD Simulation
Price: $240
In this project, a revolving rice dryer using one-way DPM has been simulated and the results of this simulation have been investigated.
Rice Dryer Using DPM (Revolving ), CFD Simulation Ansys Fluent Training
In this project, a revolving rice dryer device was simulated using Evaporating droplets with a one-way DPM model in Ansys Fluent software, and then the results were investigated. Hot air enters the rice dryer through the holes in a porous tube located at the center of the enormous chamber. About three million rice particles are injected with 15% moisture droplets into a chamber revolving with 100rpm angular speed.
Geometry & Mesh
The 3D geometry was generated in SpaceClaim software. A cylinder with a 4.5m diameter and 1.68m height.
In addition, an unstructured mesh grid was carried out using Ansys meshing software, and overall, 2703907 elements were generated.
CFD Simulation
Several assumptions have been considered to simulate Revolving rice dryer, including:
- The simulation is Transient(unsteady) in order to capture the behavior of fluid and particles over time.
- The pressure-based solver type was used due to the incompressibility of the working fluid(air).
- The One-way Discrete Phase Model(DPM) was utilized, so the grains of rice particles were injected with our desired condition into the fluid domain.
- Gravitational acceleration effects were considered 9.81m/s^2 in z-direction.
The following table represents a summary of the solution:
| Models(Viscous) | |||||||
| Energy | On | ||||||
| Viscous | k-epsilon Standard | Standard Wall Function | |||||
| Species | Species Transport | Mixture-template | |||||
| Discrete Phase Model | |||||||
| Interaction with continuous phase Unsteady particle tracking | off on | ||||||
| Injections | |||||||
| Injection Type Number of streams | Surface – wallinlet | ||||||
| Particle Type | Droplet | ||||||
| Material Evaporating species Diameter distribution | Water-liquid H2o Uniform | ||||||
| Diameter | 0.00214m | Stop Time | 8s | ||||
| Temperature | 300K | Velocity Magnitude | 1m/s | ||||
| Start Time | 0s | Total Flow Rate | 0.05kg/s | ||||
| Materials | |||||||
| Mixture-template | Definition method | Fluent database | |||||
| Material name | Air | ||||||
| Droplet Particle | Definition method | Fluent database | |||||
| Material name | Water-liquid Volatile component fraction = 15% | ||||||
| Cell zone condition | |||||||
| Material name | Mixture-template | ||||||
| Frame Motion | Speed | 100rpm | |||||
| Boundary condition | |||||||
| Inlet | Type | Velocity inlet | |||||
| Velocity magnitude | 0.3m/s | ||||||
| Turbulent intensity | 10% | ||||||
| Hydraulic Diameter | 0.0254 | ||||||
| Temperature | 308K | ||||||
| DPM BC Type | escape | ||||||
| Outlet | Type | Wall | |||||
| DPM BC Type | reflect | ||||||
| Tube | Type | Wall | |||||
| Coupled | -- | ||||||
| DPM BC Type | reflect | ||||||
| Solver configuration | |||||||
| Pressure-velocity coupling | Scheme | Coupled | |||||
| Spatial Discretization | Gradient | Least squares cell-based | |||||
| Pressure | Second-order | ||||||
| Momentum | Second-order upwind | ||||||
| Turbulent kinetic energy | First-order upwind | ||||||
| Turbulent dissipation rate | First-order upwind | ||||||
| H2o | Second-order upwind | ||||||
| Energy | Second-order upwind | ||||||
| Initialization | Initialization methods | Standard Initialization | |||||
| Run calculation | Time step size | 0.1 | |||||
| Number of time steps | 1600 | ||||||
| Max iterations per time step | 20 | ||||||
Results
After injecting about three million rice particles through the inlet, they gather around the porous tube in the middle of the chamber. As shown in figure 1, H2o mass fraction concentrated around the tube at first, but after a while, due to the release of hot air from tube holes to the chamber, the evaporating process begins and causes vaporizing material(H2o) to disperse; This may reduce the moisture of rice particles which was 15% at the beginning and as a result, the diameter decrease that depicted in figure 2. In addition, the Rotational speed of the chamber accelerates the circulation of hot air.
