[Amps] Force cooled heatsink aerodynamics

[Roger (K8RI)]

On 2/17/2014 5:44 PM, Markku Oksanen wrote:
> Hi
>
>
>
> I have one of these heatsinks that have two 120 mm side by
> side and it is with the air flow chamber.
>
> The chamber is just an empty box about the thickness of the
> fans, in my case perhaps 35-40 mm.

It may be used to create turbulence.
Turbulent flow provides more efficient cooling than laminar flow.

73

Roger (K8RI)

>
> How exactly this helps I can only intuitively imagine, I
> would think that having fan blades rotating very close to a dense cooling fan
> grid is not the most efficient way of pushing air through.
>
>
>
> My project is for a pair 1200 w freescale dual fets for HF,
> hopefully with some headroom for reliability.
>
>
>
> Markku
>
> OH2RA /OG2A /WW1C 		 	   		
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