Simulation of Liquid Droplets Evaporation
In this section, you will learn to simulate the liquid droplets evaporation and cooling process of a hot air stream in a circular channel. We will model water injection employing species transport and discrete phase models in ANSYS Fluent 14.5.
Heat transfer is one the phenomena occurring in many important industrial processes whether we need to add heat or remove heat from the systems. Both air and fluids can be used in cooling systems. CFD simulations will help engineers understand and analyze the process of cooling and finally design low cost and efficient cooling systems.
In this problem, we have modeled the cooling process by water injection and evaporation of liquid droplets. We have considered a 3D circular pipe. Hot air enters through the inlet and we inject water droplets at various axial and radial locations by creating Discrete Phase Model injections. When water comes in contact with hot air, its phase changes and the mixture of air and vapor flows downstream.
We find the solution to this problem in two stages:
- We first solve for flow and get the converged solution (no evaporation)
- Switch on the DPM iterations and solve the actual phase change problem
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