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Pool Boiling, Surface Wettability Effect on the Boiling Curve (Validation)

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The present problem simulates the nucleate boiling inside a vertical channel. The simulation is based on a reference paper “A numerical investigation of the effect of surface wettability on the boiling curve” and its results are compared and validated with the results in the article.

This ANSYS Fluent project includes CFD simulation files and a training movie.

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Description

Paper description

The present problem simulates the nucleate boiling inside a vertical channel. The simulation is based on a reference paper “A numerical investigation of the effect of surface wettability on the boiling curve” and its results are compared and validated with the results in the article. The water inside the channel is assumed to have a saturated temperature of 373K and the channel has a heat plate (bottom wall) with different temperatures (from 375-475K) to account for different  based on the paper.

Inside the channel, the water already has a temperature of 100 degrees centigrade, so when it comes into contact with the hot bottom wall, the boiling process will start. If the  is big enough, the nucleate boiling will occur and a hot bubble will separate from the heated surface. Also it should be mentioned that to simulate two phases of air and vapor, VOF Multiphase model was activated.

Geometry & Mesh

The geometry of this model is designed in ANSYS design modeler® and is meshed in ANSYS meshing®. The mesh type used for this geometry is structured. The total element number is 60000.

pool boiling pool boiling

Pool Boiling CFD Simulation Settings

The key assumptions considered in this project are:

  • Simulation is done using pressure-based solver.
  • The present simulation and its results are transient.
  • The effect of gravity has been taken into account and is equal to -9.81 m/s2 in Y direction.

The applied settings are summarized in the following table.

 
Models
Viscous model Laminar
Multiphase VOF
Body force formulation Implicit body force
Surface tension coeff. 0.1 n/m
Mass-transfer Evaporation-condensation
Phase 1 vapor
Phase 2 water
Boundary conditions
Outlets Pressure outlet
Gauge pressure 0 Pa
Walls stationary
Temperature Different temperature based on article
Solution Methods
Pressure-velocity coupling SIMPLE
Spatial discretization pressure PRESTO!
Volume fraction Modified HRIC
momentum second order upwind
energy second order upwind
Initialization
Initialization method   Standard
gauge pressure 0 Pa
velocity (x,y) (0,0) m/s
water volume fraction 1
Temperature 373.15 K

Paper Results validation (Pool Boiling)

At the end of this simulation, the results of the present work are compared with results obtained by the article. For this purpose, the diagram in figure 8 was used which shows the changes of transferred heat flux to fluid based on the changes of . The present project is for the state of contact angle equal to 60 degrees and .

Paper Results Present Simulation Error (%)
Average 55741.9 52158.295 6.429
Max 67096.8 64285.516 4.189

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, the Training File presents how to solve the problem and extract all desired results.

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