- Jun 12, 2010
The short answer to your question is:
Plus, these fans are incredibly expensive, they're $20 each at DigiKey...if you buy 200 of them. I'd go with GreenMechanic's setup if you can.
How about this for a shameless plug. I originally posted this idea on 07/03/2010 @ 1:48am. Post# 570, 574, 577.Time for some shameless plugging:
It wouldn't be hard, at least from a mechanical standpoint. Merely time consuming. If the fins were down the full length of the heatsink. They could be cut using a jig to hold the heatsink, and a saw(band, table, whatever. I've even cut AL with a circular saw with wood blades in a pinch), providing you were using aluminum or C145 copper. Pure copper would be bad about gumming up blades though. Having longitudinal fins only partway down the sink would require either a very small diameter saw (think dremel), or a mill though.I'd like to see someone implement this though. Making that heatsink with the fins going parallel to aixiz module is going to be the hard part IMO. I hope someone gets this made, I'd like to see the duty cycles on a 2A 445nm with this. :beer:
That sounds like a good idea, much easier to machine too.Another method would be to simply bore lots of small holes through the heatsink 'slug', parallel with the aixiz module for the air to move through. This method would actually probably be best and easiest to do for a heatsink that was to still be housed inside the host, and all it would take to do it would be a drill press, providing you were dealing with an existing heatsink, anyway.
Actually this is incorrect. Copper's better heat transfer allows it to dissipate heat faster than aluminum for the same surface area. There are really two main reasons why copper isn't used entirely for most heatsink applications.Copper has less resistance to heat but is much less efficient at dissipating this heat into the surrounding air, hence the composite copper-aluminum heatsink design.
The copper wicks the heat from the diode, and the aluminum dissipates it into the air.
From a thermal viewpoint fins would be more efficient than holes bored through a solid block.
Only problem is, I've neither the resources or the money to pursue this project. I'm hoping someone out there would be able to build one of these things.
Also- I don't know how well an axial fan would stand up to the back-pressure, especially with those small holes. Those small yet cute centrifugal fans just may be the way to go.