Magazine article Science News

The Little Chill: Tiny Wind Generator to Cool Microchip Hot Spots

Magazine article Science News

The Little Chill: Tiny Wind Generator to Cool Microchip Hot Spots

Article excerpt

Technologists cramming more and more transistors onto microchips face a common problem: too much heat. To make computers chill, manufacturers typically outfit hot chips with heat sinks, whose fins release heat into a stream of air.

Now, a team of university, and industrial engineers has created a prototype, microscale air pump that they say could be fabricated with the techniques used to mass-produce microelectronic components such as transistors. The pump would generate cooling breezes right where the heat is being created.

The new work shows for the first time that "the principle works at the scale and the rate needed," says electrical engineer Alexander V. Mamishev of the University of Washington in Seattle, who leads the group that came up with the device.

To make the pump, the researchers used a beam of high-energy ions to carve a slender needle jutting out from the edge of a piece of silicon. When mounted just above a pad of electrically conductive foam and energized with thousands of volts, the needle produces a powerful electric field that ionizes the surrounding air, says University of Washington team member Nels E. Jewell-Larsen.

Propelled by the electric field, ionized gas molecules rush toward the pad below. On their way, they run into gas molecules and push them along. The minuscule wind, which reaches about 25 kilometers per hour, cools the pad's surface, Jewell-Larsen says.

In recent tests of the prototype micropump mounted above a pad heated to roughly 50[degrees]C, the microwind cooled a fingerprint-size patch of the pad by as much as 25[degrees]C, Chi-Peng Hsu of the University of Washington reported on Tuesday in Chicago at a mechanical engineering conference. …

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