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26th June 2012 21:58 #1
Sandia Cooler: Air Bearing Heatsink Prototype - CPU cooler
, "almost ready for prime time" Sandia Cooler, Sandia National Laboratories: Technology Summary News Releases ", - ".
( ).
: "The thermal interface - a self-regulating, 0.02mm-thick, hydrodynamic air-bearing - presents negligible thermal resistance" - :
"Heat flows from the stationary aluminum base plate to the rotating heat-sink-impeller
through this 0.02-mm-thick circular disk of air. As shown later in Figure 34, this air-filled
thermal interface has very low thermal resistance and is in no way a limiting factor to device
performance; its cross sectional area is large relative to its thickness, and because the air that
occupies the gap region is violently sheared between the lower surface (stationary) and the
upper surface (rotating at several thousand rpm). The convective mixing provided by this
shearing effect provides a several-fold increase in thermal conductivity of the air in the gap
region."
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