| Cross-Cut Heat Sinks |
Cross-Cutting is a manufacturing operation, which converts a straight finned extruded heatsink into a pin-fin array.
The omnidirectional airflow of the pin-fin array improves thermal performance over straight
finned extruded heat sinks where natural convection or low/undefined air flow is available,
as well as impingement cooling designs.
This omnidirectional configuration allows air to easily penetrate and exhaust the heat sink from any possible direction through its open channel design. At the same time, the rectangular nature of the pins creates turbulence within the heatsink. Turbulent air breaks the stagnant air boundary layers around the pins and, as a result, enhances the heat sink's thermal performance. In addition, the pin-fin structure exposes the entire surface area to incoming airflows and, at the same time, does not present an extreme pressure resistance to the inbound airflow. 
In general, Comair Rotron's omnidirectional pin fin heatsinks possess excellent thermal characteristics,
relative to their size, due to their efficient physical structure and the use of highly conductive
aluminum and/or copper materials. This is one of the reasons that these types of heat sink designs
are used in cooling BGA and DC/DC Converter packages.
In practice, any of Comair Rotron's extrusion profiles can be converted into an omnidirectional pin-fin heatsink. If an existing standard product or extrusion profile does not exist to accommodate your design/thermal performance requirements, Comair Rotron is able to produce custom designs to meet the volumetric / thermal performance requirements of your design. These custom designs can include round and elliptical fins manufactured from a forging process. Contact our application engineering department for design assistance or manufacturing design parameter questions in order to incorporate Comair Rotron heat sinks into your product. |
