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Nucleate Boiling CFD Simulation, ANSYS Fluent Training

  • Upon ordering this product, you will be provided with a geometry file, a mesh file, and an in-depth Training Video that offers a step-by-step training on the simulation process.
  • For any more inquiries regarding the product, please do not hesitate to reach out to us at info@CFDLAND.com or through our online support assistant.

Original price was: €185.00.Current price is: €125.00.

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Description

Nucleate boiling is of great importance when vapor bubbles form and grow on a hot surface submerged in a liquid. This process usually happens when the surface temperature is slightly higher than the liquid’s boiling temperature. Vapor bubbles start to form in certain places, which are typically tiny holes or other flaws on the hot surface. As these bubbles get bigger, they break away from the top and rise through the liquid because of the force of buoyancy. Nucleate boiling is excellent at heat transfer because it absorbs heat slowly while bubbles form and move the liquid around as bubbles leave the top. The current study is very fundamental work in which the nucleate boiling inside a vertical column with a heated wall is investigated.

Schematic of nucleate boiling cfd simulation problem

Figure 1: Schematic of nucleate boiling cfd simulation problem

Simulation Process

After the generation of vertical column regarding Axisymmetric planar mode and structured grid in ANSYS, the model is imported into Fluent solver for further settings. Activation of Eulerian multiphase model is a preliminary step toward modeling Boiling in Fluent. The nucleate boiling CFD simulation features from RPI Boiling Model. The mass transfer between phases (water liquid to vapor) is governed by Boiling phenomenon. The 318KW/m2 heat flux on walls boost the boiling process.

Post-processing

The RPI boiling model in ANSYS Fluent with the Eulerian multiphase method was used to simulate nucleate boiling in a vertical column with heated walls. The temperature contour and exit vapor volume fraction show interesting results. There is a thermal gradient shown by the column cross-section temperature line. The column walls that are the hottest, at 664 K (391°C), are shown in red. This high wall temperature is needed to start nucleate boiling. We see a quick drop in temperature from the walls inward, with the color bands showing different temperature ranges. The heart of the column, which you can see in blue, is 473 K (200°C) cooler. The hot walls of nucleate boiling provide the heat energy that makes bubbles form and grow. The big difference in temperature near the walls probably helps heat move from the wall to the bulk fluid more quickly because gas bubbles form and break apart. The end vapor volume fraction of 0.0062 shows how well the boiling process is working. This number tells us that 0.62% of the output fluid is vapor. Most of the fluid leaves the column as liquid because of the tiny vapor fraction. There are several possibilities: the column height might not be high enough. Ultimately, the modeling results show that vertical column nucleate boiling is possible. The temperature contour shows the temperature differences that cause boiling, and the outlet vapor volume percentage shows the phase change.

Graph showing vapor volume fraction of nucleate boiling CFD simulation

Figure 2: Graph showing vapor volume fraction of nucleate boiling CFD simulation

Volume fraction of vapor from nucleate boiling CFD simulation

Figure 3: Volume fraction of vapor from nucleate boiling CFD simulation

FAQ

We pride ourselves on presenting unique products at CFDLAND. We stand out for our scientific rigor and validity. Our products are not based on guesswork or theoretical assumptions like many others. Instead, most of our products are validated using experimental or numerical data from valued scientific journals. Even if direct validation isn’t possible, we build our models and assumptions on the latest research, typically using reference articles to approximate reality.

Yes, we’ll be here . If you have trouble loading files, having technical problems, or have any questions about how to use our products, our technical support team is here to help.

You can load geometry and mesh files, as well as case and data files, using any version of ANSYS Fluent.

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Original price was: €185.00.Current price is: €125.00.