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Method for dust mitigation for high aspect ratio heatsinks

IP.com Disclosure Number: IPCOM000023827D
Publication Date: 2004-Mar-31
Document File: 3 page(s) / 127K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for dust mitigation for high aspect ratio heatsinks. Benefits include improved functionality and improved performance.

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Method for dust mitigation for high aspect ratio heatsinks

Disclosed is a method for dust mitigation for high aspect ratio heatsinks. Benefits include improved functionality and improved performance.

Background

         Conventional fin heatsinks used in electronics package cooling have a limited heat rejection capability. The limitation may be caused by incapacity to use high aspect ratio fins and small fin gaps due to concerns about dust accumulation.

         Conventionally, most of the heatsinks do not require dust mitigation techniques because the fin gap is large enough to let dust pass through the heatsink. However, because of increasing power densities, very dense fins are anticipated. For fin gaps lower than about 1.2 mm, dust accumulation at the air-flow leading edge of the fins may reduce the thermal performance of the heatsink.

         Dust accumulation is due to relatively long fibers becoming wrapped over the leading fin edge. These trapped fibers catch additional fibers, and the resulting accumulation chokes the air flow through the fin gaps. Because the fibers are wrapped over the leading edge of the fin, reversing the air-flow direction dislodges and frees the fibers. This action must be periodically reversed to keep dust from accumulating on both edges of the fins.

         If high-density plates are used in heatsink fabrication for high thermal performance, dust can accumulate on the fins at the air inlet (see Figure 1).

         This accumulation may result in increased pressure drop, potentially decreasing the heatsink‚Äôs thermal performance. As a result, a requirement exists for a dust mitigation solution.

General description

         The disclosed method is dust mitigation for high aspect...