heatsink, the mutant

bigpanda · 5th July 2006, 11:23 AM

I have seen this kind of heatsink a few days ago. The base is about 300mm in length. What will be your comment on this? The fins are just like enlarge fins of a car raditor. They are no more thicker than 0.7mm and very densely populated. Does the wavy fins work better than the straight ones or just a gimmick?

richie00boy · 5th July 2006, 11:33 AM

Should work very well. Surface area and material heat conductivity are the key factors.

AndrewT · 5th July 2006, 11:52 AM

Hi,
the fins do seem a little thin, particularly at the root.
The root thickness works well when it is about 10% of the fin height. The fin can be tapered in profile or parallel sided.

What is the gap between the fins?
Less than 5mm or 6mm indicates a fan blown sink.

What is the back plate thickness?
a good heat transfer is achieved when thickness to conduction radius ratio is about 1:10. i.e. 5mm thick works out to about 50mm radius.

dangus · 5th July 2006, 08:02 PM

It could just be due to a different method of fabricating the heat sink. I've seen heatsinks that looked like the fins had been "shaved" away from the base chunk of aluminum. Maybe with extruded heat sinks it isn't possible to make fins as thin.

testlab · 6th July 2006, 04:33 PM

This type of fin profile tries to exploit maximum radiating surface area, with less material. I have a dozen similar heatsinks myself.

A small, lowspeed fan, should serve to improve performance.

5th July 2006, 11:33 AM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Should work very well. Surface area and material heat conductivity are the key factors. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

5th July 2006, 11:52 AM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, the fins do seem a little thin, particularly at the root. The root thickness works well when it is about 10% of the fin height. The fin can be tapered in profile or parallel sided. What is the gap between the fins? Less than 5mm or 6mm indicates a fan blown sink. What is the back plate thickness? a good heat transfer is achieved when thickness to conduction radius ratio is about 1:10. i.e. 5mm thick works out to about 50mm radius. __________________ regards Andrew T.

6th July 2006, 04:33 PM	#5
testlab diyAudio Member Join Date: Dec 2005 Location: Grand Rapids MI	This type of fin profile tries to exploit maximum radiating surface area, with less material. I have a dozen similar heatsinks myself. A small, lowspeed fan, should serve to improve performance. __________________ It's not whether you win or lose, it's how you lay the blame.

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5th July 2006, 08:02 PM	#4
dangus diyAudio Member Join Date: May 2004 Location: Vancouver Island	It could just be due to a different method of fabricating the heat sink. I've seen heatsinks that looked like the fins had been "shaved" away from the base chunk of aluminum. Maybe with extruded heat sinks it isn't possible to make fins as thin.

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