Here's a design I have been contemplating. The corners without the 3/8" outlets would be filled with shaped foam to direct the water and minimize dead flow areas. Thi 1/2" inlet would have a 1/2" copper tube extending to just above the center of the base of the heatsink. I think the all copper swiftech would be a very good candidate for something like this.
Agreed, equal flow in both directions would be desirable.
How about combining 1" inlet w/dual 1/2" outlets to this monster pump which flows 724gph through a 1" line @ 4feet. What kind of encasement material and thickness do think would be needed?
With the cool water entering over the core and dispersing equally out and away (yes by means of water pressure) the need for two outlets is to eliminate dead flow areas where heat would build up if there was only one outlet. Also the heated water would be propelled away from the base along the pins which would give up even more heat to the water.
Y'know, I haven't done much with watersinks, though I have a prime candidate HSF to make one from. Ever see Joe's review on the Globalwin CDK-38 ? A pin HSF made from one piece of copper, not aluminum pins staked into a copper base. I have one and am seriously considering converting it to a watersink, just for something to play with in the shop. I think it has potential. Otherwise, a well designed waterblock will serve your needs if you just want to buy something that works right out of the box.
Any comments on the high flow pump w/one inch inlet idea? The two 1/2" outlets could each go through their own radiator before merging back to the pump. This type of block with one large chamber would seem to make sense to use in this high flow situation.