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A comment on The fanless heatsink: Silent, dust-immune, and almost ready for prime time. Parent comment

Re:The fanless heatsink: Silent, dust-immune, and almost rea... by thrownawayfan on Monday June 25, 2012 @12:04PM (#4157119)
There's a whitepaper available here http://prod.sandia.gov/techlib/access-control.cgi/2010/10025...

Their data suggests that the air gap provides minimal resistance to the flow of heat. As for the clearance, they've stated that unusually high-precision manufacturing is not required for the two surfaces.

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Re:The fanless heatsink: Silent, dust-immune, and almost rea... by nialo on Monday June 25, 2012 @01:21PM (#4157503)
Re: clearance, while .001" clearance isn't something I'd want in a design particularly, modern machine tools are good enough that you get flatness and surface finish good enough to not have problems at .001" clearance basically free on any machined surface.
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