Heat Pipe Placement in Aavid Genie

Appropriate placement for quick simulations of embedded heat pipes

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Aavid Genie Heat Pipe Options

Aavid Genie gives the option of adding embedded heat pipes into the base of your heat sink. Genie takes your device layout into account when determining heat pipe placement. This method approximates what Aavid Engineers would do, which is to focus heat spreading at your heat sources.

Aavid Genie’s parent software, Aavid SmartCFD, can implement more complex swept heat pipe geometry which reflects how we can apply heat pipes in the real world. To keep Aavid Genie fast and simple, it can only insert straight heat pipes that extend from one end of the base to the other.

In case you’re looking for more uniform spreading, we can simulate a vapor chamber in Aavid Genie by applying a Uniform Heat Load. This way you can conduct a rough comparison to assess if your application requires heat pipes or vapor chambers.

Otherwise, there are 4 different ways Aavid Genie will place heat pipes in your base depending on the number of devices and number of heat pipes you include in the base. 

Single Heat Pipe with a Single Heat Source

For single heat sources, heat pipe placement is straightforward. Genie will line up the center of the device and the center of the heat pipe in the direction you selected. You can select that heat pipe axis runs in the same direction as the fins along the flow length of the heat sink or perpendicular to the fins along the width of the heat sink.

Single Heat Pipe with Multiple Heat Sources

For single heat pipes and multiple devices, Aavid Genie will place that one heat pipe in between the two sources. If you have multiple devices that do not line up on the same heat pipe and both require some level of heat spreading, you should consider including multiple heat pipes in your base.

Multiple Heat Pipes and a Single Heat Source

Placements with multiple heat pipes and multiple heat sources are a little more complex, so Aavid Genie makes some assumptions. The Genie evenly distributes the number of heat pipes you’ve included in your design over the widest dimension you have placed heat loads.

For a single heat source, Genie tries to group multiple heat pipes all under the heat source. Aavid Genie limits how close it places each heat pipe, so if there are more pipes than can fit under the device, the heat pipes are grouped together around the center of the heat source. This means that if the Genie can’t place all the heat pipes over the heat source, it places them as group centered over the heat source.

Multiple Heat Pipes and Multiple Heat Sources

Again, Aavid Genie will evenly spread out multiple heat pipes across multiple heat sources. The farthest width occupied by heat sources is the width that Aavid Genie will spread the heat pipes across. If there is a gap between your devices, that gap is considered part of the width the pipes will be spread across. While this may not always yield a layout an Aavid Engineer would select, it does give you a better idea of how heat pipes can improve base spreading for your heat sink.

If you’re concerned the gap between devices is too large and you’re not getting heat pipes under your base, try increasing the number of heat pipes you include. In fabrication, heat pipes can take U-shaped geometries and act as two heat pipes. Also, the jump in cost between a couple embedded heat pipes and a few more is typically offset by added performance.

Heat Pipe Placement for Uniform Heat Sources

Adding a uniform heat source won’t affect your heat pipe layout. Since adding that load isn’t changing where your heat load is concentrated, altering the heat pipes won’t accomplish anything different. In general, uniform heat loads are what heat pipes are aiming to approximate anyways.

Try out embedded heat pipes in Aavid Genie.

If you need more help with heat pipes or heat pipe placement, please Contact our Engineering Team. They’re experts in the field and can help with your application.