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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 207.67

+2.2%

Jan 12 3:59 PM EST

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To: Mani1 who wrote (28225)	2/13/2001 12:11:51 AM
From: fyodor_	Read Replies (1) of 275872

Mani, ever heard of IsoSkin? JC reported on it a while back (linked to this ZDNET story: zdnet.com Novel Concepts has registered patents for a form of liquid cooling called IsoSkin. This is basically metal plates situated very closely together (within half a millimeter of each other) containing liquid suspended in a vacuum. Essentially, this is just a really good heat spreader which can allow some devices to operate without the necessity for cooling fans. That prompted me to make this post on JC's message board: The "liquid suspended in a vacuum" part of JC's comments made me wonder what was really going on. Vacuum isn't exactly known for its wonderful thermal conductivity ;) Only thing I could come up with was some kind of capillary action was at work. Looking up the patents (see below), this indeed turned out to be the case (so the liquid is _not_ "suspended in vacuum") - but with some very elegant features: -- A heat spreading apparatus includes a first planar body for attachment to a heat generating surface which results in a hot region and a cool region on the first planar body. A second planar body connected to the first planar body is used to define a void between the first planar body and the second planar body. The void includes a planar capillary path and a non-capillary region. A fluid positioned within the void distributes heat by vaporizing the fluid from the planar capillary path in the hot region, condensing the fluid in the non-capillary region in the cool region, and moving from the non-capillary region to the planar capillary path in the hot region through capillarity. -- Well, that about says it all ;). There are some other good bits in the two patent filings... check them out here (sorry for the ridiculously long URLs - blame the uspto). 164.195.100.11; 164.195.100.11; What do you think of this concept? Anything really new in it or is this pretty much what is going on in notebooks right now? -fyo

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