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Method for a radial heatsink with internal and external fin patterns and flow passages

IP.com Disclosure Number: IPCOM000019320D
Publication Date: 2003-Sep-10
Document File: 5 page(s) / 115K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a radial heatsink with internal and external fin patterns and flow passages. Benefits include improved thermal performance, improved design flexibility and manufacturability, and improved support for future technology.

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Method for a radial heatsink with internal and external fin patterns and flow passages

Disclosed is a method for a radial heatsink with internal and external fin patterns and flow passages. Benefits include improved thermal performance, improved design flexibility and manufacturability, and improved support for future technology.

Background

The heat dissipation power and low operating temperature requirements of integrated circuits (ICs) are escalating. The heatsink’s conductive path and convective area must be optimized against volumetric and weight constraints at low cost. One of the premier low cost, net shape technologies used in manufacturing heatsinks is the aluminum extrusion process. Some critical design constraints for extrusion are the die and fin aspect ratios. They are the ratios of the length to the average width of the respective die or heatsink features. Conventional technology limits are approximately 20:1 if applied to straight fin geometry and much lower for curvilinear and hollow form complex geometries. Reducing the aspect ratios and at the same time increasing the fin area are critical to extend the air cooling thermal management technologies for IC’s.

General description

         The disclosed method is the addition of a second ring of fins in a radial design. Due to manufacturing constraints on the fin length, thickness, and relative spacing between fins the second ring effectively increases the usable fin area. This approach enables high fin density and provides improved flow management and optimal heat spreading from the heatsink base features.

Advantages

         The disclosed method provides advantages, including:

•         Improved thermal performance due to providing the optimal alignment of heat dissipating surfaces relative to the airflow and heat conduction from a highly concentrated source

•         Improved design flexibility due to including several design implementations and variations

•         Improved support for future technology due to providing significant space and weight improvements

Detailed description

The heatsink with radial fin orientation provides the optimal alignment of heat dissipating surfaces relative to the airflow and heat conduction from a highly concentrated source in the space-constrained environment. Heat spreads/conducts through the solid metal base in a radial pattern and is transferred to the fins via the fin-to-base junction. The radial form factor enables uniform temperature distribution at equilateral distances from the heat source. All areas are subject to the same cooling-fluid temperature, which enhances the thermal performance. The fin surfaces that are exposed to flowing air transfer the heat to the cooling fluid, which is transported to the ambient environment.

The disclosed method can be implemented as a radial fin heatsink design with two concentric solid rings. This design reduces the fin length that translates into a low die aspect ratio and at the same time enables a high fin density (see Figure 1...