Mass Transfer Macro,UDF, Evaporation and Condensation Rate CFD Simulation

$405.00 Student Discount

  • The problem numerically simulates the evaporation and condensation using ANSYS Fluent software.
  • We design the 3-D model with the Design Modeler software.
  • We mesh the model with ANSYS Meshing software; the element number equals 1,574,100.
  • We use the VOF Multiphase model to define water, liquid, and vapor.
  • We define a Mass Transfer between water liquid and water vapor.
  • We use the User-Defined Function (UDF) to define a mass transfer (evaporation and condensation).
  • We use the Mass-Transfer Macro for UDF.
Click on Add To Cart and obtain the Geometry file, Mesh file, and a Comprehensive ANSYS Fluent Training Video. By the way, You can pay in installments through Klarna, Afterpay (Clearpay), and Affirm.

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Special Offers For Single Product

If you need the Geometry designing and Mesh generation training video for one product, you can choose this option.
If you need expert consultation through the training video, this option gives you 1-hour technical support.
The journal file in ANSYS Fluent is used to record and automate simulations for repeatability and batch processing.
editable geometry and mesh allows users to create and modify geometry and mesh to define the computational domain for simulations.
The case and data files in ANSYS Fluent store the simulation setup and results, respectively, for analysis and post-processing.
Geometry, Mesh, and CFD Simulation methodologygy explanation, result analysis and conclusion
The MR CFD certification can be a valuable addition to a student resume, and passing the interactive test can demonstrate a strong understanding of CFD simulation principles and techniques related to this product.



In this project, we performed a numerical simulation using ANSYS Fluent software’s User-Defined Function (UDF). For this CFD product, we used MASS_TRANSFER Macro to write UDF programming. We considered a chamber inside which several rows of tubes are placed. Water vapor enters from the chamber’s top and exits from the bottom. Liquid water also passes through the internal tubes of the chamber.

The temperature difference between the water vapor inside the chamber and the liquid water inside the pipes leads to heat transfer. This heat transfer can lead to phase exchange. If water vapor reaches below the saturation temperature, condensation occurs. If the liquid water reaches above the saturation temperature, evaporation occurs.

In this project, we intend to estimate the evaporation and condensation rates. In the first step, we modeled the geometry in 3D with Design Modeler software. Then, we meshed the model with ANSYS Meshing software. The Mesh is unstructured, and 1,574,100 cells are created. Finally, we numerically simulated the current model based on the CFD method by ANSYS Fluent software.

Methodology (UDF)

In this project, we define two fluids: liquid water and water vapor. So, we used the Multiphase model. We use the Volume of Fluid (VOF) multiphase model since we intend to prevent two fluids from mixing.

Since we aim to model the phenomenon of evaporation and condensation, we need to define a Mass Transfer between liquid water and water vapor. So, we used a User-Defined Function (UDF) to define the mass transfer rate.

We need to use the Mass Transfer Macro (DEFINE_MASS_TRANSFER macro) for this UDF. According to this UDF, we considered the temperature of 373.15 equivalent to saturation temperature. If the temperature is lower than the saturation temperature, the condensation relation is defined; if the temperature is higher than the saturation temperature, the evaporation relation is defined.

Conclusion (UDF)

After completing the calculation, we will review the results. To analyze the results, we obtain some contours. We obtain the volume fraction of water (liquid), the volume fraction of water (vapor), and temperature contours. The contours show that heat transfer leads to evaporation and condensation.

Inside the chamber, the water vapor reaches below the saturation temperature, resulting in condensation. Inside the pipes, the water vapor reaches above the saturation temperature, resulting in evaporation. We conclude that we performed the current numerical simulation correctly, and our UDF worked correctly.


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