Welcome to Ozen Engineering's Video Blog
My name is Mert Berkman, and this is the third video in our series discussing the conjugate heat transfer model in ANSYS Discovery.
Overview of Previous Videos
In the previous videos, we covered the setup of an electronics cooling problem featuring:
- A chassis with air flowing from left to right.
- A simple system with a board and a small die on top, which generates heat.
- A large heat sink to dissipate heat into the environment.
We discussed setting up the model, defining boundary conditions, and running the model in both explore and refine modes, highlighting the differences between them.
New Features in ANSYS Discovery 2024 R1
Today, I want to introduce two new features in ANSYS Discovery 2024 R1. Let's start with the first one:
Surface-to-Surface Radiation Capability
This feature is no longer in beta; it's now fully integrated and available for use. Here's how to apply it to our example problem:
- In our current setup, we only have convection and conduction modes for heat transfer.
- The option to include external radiation is available, but it only applies to the outer surfaces as a boundary condition. It does not solve for radiation inside the enclosure.
To introduce surface-to-surface radiation:
- Click on the fluid-solid interfaces, which are highlighted in blue.
- Identify the three surface pairs:
- Air volume and heat sink
- Air volume and the die
- Board and air volume
- Click the button to include internal radiation.
- Once enabled, restart the simulation.
Simulation Results
In the previous simulation, the peak temperature was 178°C. By adding the surface-to-surface radiation mode, the peak temperature decreased to 160°C, providing an additional pathway for heat transfer from hot to cold regions.
The radiation model took slightly longer to run, approximately 10 minutes compared to 5 minutes without radiation. However, the reduction in peak temperature to 160°C, as opposed to 173°C, marks this run as a success.
Conclusion
We successfully demonstrated the use of the surface-to-surface radiation model in ANSYS Discovery 2024 R1, achieving improved thermal management in our electronics cooling problem.
Hello. Welcome to a video blog by Ozen Engineering. My name is Mert Berkman and this is the third video in this series talking about the conjugate heat transfer model in ANSYS Discovery.
In the previous videos, we talked about building an electronics cooling problem where we have a chassis with air going in and out from left to right.
It's cooling a simple system with a board, a die on top of it which generates heat, and a large heat sink to move away the heat and into the environment. In the previous videos, we set up the model, boundary conditions, and ran the model in explore mode and refine mode.
We also talked about the differences. Now, I want to talk about two new great features in ANSYS Discovery. The first one is the surface-to-surface radiation capability. It's no longer a beta feature and is now embedded for users to use. I will show you how to use it for this example problem.
Currently, for this problem, we only have convection and conduction mode for heat transfer. You'll notice this little sign here that says "include external radiation." This is only for the outer external surface and is added as a boundary condition.
This does not mean that we have radiation solved inside the enclosure. To introduce surface-to-surface radiation, click on the fluid-solid interfaces. Now, you'll see the fluid-surface interfaces painted in blue.
There are three surface pairs: one between the air volume and heat sink, the second between the air volume and the die, and the third interface between the board and the air volume. Go to these interfaces and click the "include internal radiation" button.
Now that we've turned it on, we can start the simulation again. In the previous simulation, we saw the peak temperature at 178 degrees Celsius.
By adding this new heat transfer mode, namely surface-to-surface radiation, the peak temperature should come down because now there's another pathway to move the heat from hot to cold regions. We can see that the peak temperature is now reduced to 160 degrees Celsius, and the radiation model ran.
It took a little longer than the model without radiation, maybe five minutes versus 10 minutes. We see that the peak temperature is now reduced to 160 degrees Celsius, rather than 173, as we were expecting. We'll call this run a success.
