Air Freshener Spray in Restroom CFD Simulation

Air Freshener Spray in Restroom CFD Simulation, Ansys Fluent Training

The present problem simulates the Air Freshener Spray in the restroom using ANSYS Fluent software. We perform this CFD project and investigate it by CFD analysis.

The present model is designed in three dimensions using Design Modeler software. The model’s geometry includes a computational domain of the interior of a restroom.

The meshing of this present model has been generated by Ansys Meshing software. The mesh grid is unstructured, and the curvature method was used to focus on grid-sensitive areas. The total cell number is 1187006.

Air Freshener Methodology

This project investigates the spraying of Air fresheners in the restroom by the Two-way DPM method in Ansys Fluent software. According to this definition of injection, fragrance particles are physically expelled from the device by water droplets that evaporate in space.

These droplets have a temperature of 310 K, a velocity of 50 m.s, and a mass flow of 0.018 kg.s-1, which are emitted at intervals of 0s to 0.1s. The particle diameter is not constant during diffusion, and the rosin-rambler-logarithmic distribution method is considered for the diameter of the Particles.

Following this method and the suitable formulation, the values ​​related to the minimum, maximum and average diameter, the spread’s exponential parameter, and the number of diameters per injection are determined.

It should be noted that the drop mode is applied when the species transport model is also activated.

The boundary conditions of the discrete phase model at the output boundary of the device, the inlet, and the toilet’s outlet are defined by Escape mode, which means that the particles cross this boundary.

The Trap model is used at the boundaries of all walls and heaters, which means particles are trapped and collected on these surfaces. The present simulation process is performed unsteadily with time steps equal to 0.01 seconds.

Moreover, the RNG k-epsilon model and energy equation are enabled to solve the turbulent fluid equations and calculate temperature distribution within the domain.

Air Freshener Conclusion

At the end of the solution process, Observing the obtained results, we conclude that the heater in the restroom creates a suitable temperature for this place and causes the flow in the bathroom to rotate, in addition to causing the particles to evaporate.

Also, according to the attached animation, it can be seen that most particles with larger diameters are in a lower position than particles with smaller diameters due to higher mass and then evaporate.