hi all,
im planing of making a set of heat sink and I'm looking around at the different design one could go with, and that raised the following questions.

first of, is the idea to have as much contact area as possible and as much brass in there, as in brass absorbs the heat and as such the more brass the more heat it can absorb ?
in that case i would go with two round halfs of brass like in the photo below:Screenshot 2015-08-16 19.06.16.jpg

or should i put a bitt more effort in and go with a design that has a few more cuts in its design and as such looks like it can radiate the heat better ?like the one's in this photo ?Screenshot 2015-08-16 19.15.11.jpg

what ever design i will go with it will have to be able to purge as well.

i don't quite know the nitty gritty about how these puppies do there job and i hope perhaps someone here can explain it to me, i have used the search function on heat sink but no price (-:

thanks, mick van aar