Pool Boiling, Surface Wettability Effect on the Boiling Curve (Validation)
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.
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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. 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 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.
|Body force formulation||Implicit body force|
|Surface tension coeff.||0.1 n/m|
|Gauge pressure||0 Pa|
|Temperature||Different temperature based on article|
|Volume fraction||Modified HRIC|
|momentum||second order upwind|
|energy||second order upwind|
|gauge pressure||0 Pa|
|velocity (x,y)||(0,0) m/s|
|water volume fraction||1|
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 (%)|
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.