Quote:
Originally posted by bigben2k
Inpingement is putting a restriction in the flow, strictly for speeding up the coolant, over a very short range. Think about a nozzle.
It's effective because it increases the flow speed over a critical area: the inside of the block where the CPU core is.
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Not quite the defintion of impingement.
Impingement in the dictionary sense means "to collide".
Water flowing down some channels don't "collide" with the surfaces, just flow along.
Impingement in water-cooling terms means making the water "collide" with a surface. The best surface for that is the surface that sits directly above the CPU core. The effectiveness of impingement cooling is directly linked to the velocity of the water striking the surface. By carefully restriction openings at various locations (ie. nozzles) we can greatly accelerate the water velocity to more rapidly strike the surface, and as a result improve the convectional co-efficient of the metal-water layer and cool more efficiently.
[Edit - I said velocity then said flow after - when really I was meant to be referring to velocity at all times]