Surface Evaporation of a Falling Water Droplet, ANSYS Fluent CFD Training
$270.00 Student Discount
- The problem numerically simulates the surface evaporation of a falling water droplet using ANSYS Fluent software.
- We design the 2-D model by the Design Modeler software.
- We Mesh the model by ANSYS Meshing software.
- The mesh type is Structured, and the element number equals 94800.
- We perform this simulation as unsteady (Transient).
- We use the Mixture Multi-Phase Model to define droplets inside the air.
- We use a UDF to define surface evaporation as the Mass Transfer rate between water and air.
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This simulation is about the surface evaporation of a falling water droplet via ANSYS Fluent software. We perform this CFD project and investigate it by CFD analysis.
In this project, the surface evaporation process of a water droplet into the air space is investigated. The purpose of the simulation is to investigate the droplet behavior during the falling and the amount of vapor produced in the air due to the water surface evaporation.
The time taken to process the downward movement of water within the air space is assumed to be 12 seconds. No external factor as a boundary condition affects the drop, and the downward movement is based solely on the force of gravity.
The geometry of the present model is drawn by Design Modeler software. The model is then meshed by ANSYS Meshing software. The model mesh is structured, and 94800 cells have been created.
Surface Evaporation Method
In this simulation, there are three phases of water, air, and vapor in the computational area. Therefore, the Multiphase model is used to model the primary phase of air and the secondary phases of water and water vapor.
The Mixture model is used to define the multiphase model. This model is more complex than VOF and mixture models. As water droplets evaporate in space, the phenomenon of mass transfer between the two phases of water and vapor should be used.
As the evaporation of the present model is not boiling, we use surface evaporation. The major difference between boiling and surface evaporation is that boiling occurs when the water temperature reaches saturation temperature.
In contrast, surface evaporation can occur at a lower temperature than the saturation temperature, and it happens at the surface temperature of the liquid. We use the Evaporation-Condensation type mass transfer to define surface evaporation, whereas, in the present model, we use the UDF code to define surface evaporation.
Surface Evaporation Result
After simulation, the contours of temperature, velocity, and pressure are obtained. Also, contours of mass fraction of water, air, and vapor are obtained. After simulation, the contours of temperature, velocity, and pressure are obtained.
Also, contours of mass fraction of water, air, and vapor are obtained. The contours show that the water droplet is moving downwards due to gravity. After moving downwards, the droplets gradually evaporate to the surface, and as a result, the vapor is generated.