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Nucleate Boiling Modeling ANSYS Fluent

Nucleate Boiling Modeling ANSYS Fluent

Simulation of Nucleate Boiling Using the In-built Boiling Model

In this tutorial, we provide guidelines for modeling and simulation of forced convection subcooled nucleate boiling. We use Eulerian multiphase model and the in-built boiling model.

You will also learn how to do the following through this tutorial:

  • Find the solution to the single phase flow
  • Using the fully-developed outlet as an inlet for the multiphase calculation
  • Considering solution-dependent material properties as piecewise-linear functions of temperature
  • Using outlet profiles from one simulation for the inlet conditions for another simulation
  • Predict boiling using the Eulerian multiphase model
  • Obtaining a steady-state solution
  • Also, post-processing and analyzing the resulting data

Problem Description of forced convection subcooled nucleate boiling

In our simulations, we model a pipe with heated wall and an upward, vertical flow in it. The pipe diameter and length is 15.4 mm and 2 m, respectively. Also, heat transfers to the fluid at the rate of 345.6 kW/m2. Steam bubbles are formed when the wall temperature rises above the fluid saturation temperature. Then, the bubbles migrate away from the wall. The bubbles condense near the center of the pipe since the bulk flow is subcooled.

For the inlet information to the boiling simulation, we use outlet profiles of velocity magnitude and turbulence quantities produced for a simulated flow field without boiling. As a result, we have a fully-developed profile of these quantities at the inlet.

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