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Improved Foul-less Heatsink

IP.com Disclosure Number: IPCOM000032191D
Original Publication Date: 2004-Oct-26
Included in the Prior Art Database: 2004-Oct-26

Publishing Venue

IBM

Abstract

For the last few years, processor thermal specifications have begun to drive the industry to very high aspect ratio heatsinks. The aspect ratio of a heatsink is defined as the hieght of the fins divided by the fin gap (air space between fins). The predominant factor in the increasing aspect ratio in today's thermal cooling solution designs is the reduction of the fin gap, as opposed to the increase in fin height. Reducing the fin gap allows the designer to increase the area used for heat transfer to air. Blowers can then be used to force air through the reduce gaps due to their capabilites to overcome large pressure drops. The reduction of the air space between the fins, however, increases the rate in which fouling, or collection of particles and debris, occurs. Heatsink fouling leads to increased heatsink static pressures, reduced volumetric airflow rates, and increased temperatures...eventually leading to CPU throttling and CPU shutdown.