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Heat Pipe Air Deflector System to Increase Thermal Uniformity and Performance of a Heat Sink

IP.com Disclosure Number: IPCOM000193436D
Original Publication Date: 2010-Feb-23
Included in the Prior Art Database: 2010-Feb-23
Document File: 2 page(s) / 136K

Publishing Venue

IBM

Abstract

When a fan is placed in very close proximity to a heat sink, 5mm or less, there is a region of little or no airflow on the fins directly in line with the hub of the fan. This is a very significant portion of the heat sink fin surface area that is not effectively utilized. These middle fins of the heat sink where the hub of the fan are located could be the most effective fins as they are very often located directly over the device that is being cooled, however for lack of airflow are not fully utilized. In addition, there are often components such as capacitors immediately adjacent to the heat sink, but out of the airflow. Deflectors are sometimes used to cool these components, but are additional features separate from the heat sink proper. This structure deflects airflow into the dead regions in a heat sink, and/or onto components near the heat sink, but not covered by the heat sink.

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Heat Pipe Air Deflector System to Increase Thermal Uniformity and Performance of a Heat Sink

To deflect air flow into the so called "dead zone" while minimizing the added impedance to the heat sink, every other fin that lines up with the fan hub will have a section of the fin that is punched and folded over to direct air flow over the fin areas that have low local air flow velocities. This can additionally be used to direct air flow over the areas where the fins are crimped around heat pipes (Figure 1). By adding this feature toward the lower downstream side of the heat sink, air can be deflected onto planar mounted components needing additional airflow (Figure 1). Figure 2 shows the upper deflector which directs airflow over the hub dead zone. The upper deflector will also direct airflow onto the fins in the immediate vicinity of the heat pipes. This will be the hottest part of the fin. The lower deflector will direct airflow to components directly behind the heat sink.

Figure 1: Iso View Showing Location of deflectors

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Figure 2: Rear View Showing that every other fin has deflector feature in two areas as shown in Iso View.

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