Bigben..that is only 2/3 correct...you need a flare at the opposing end aswell to atomize the water...It is not the turbulence causing the extra efficiency in the block...its the atomization of the Water.
Here is a hint:
The idea behind WaterBlock spraying is rooted firmly in thermodynamics. As water changes phases from liquid to gas an enormous amount of heat energy is absorbed. We want to use the heat absorbing properties of the water to gas phase transformation to cool our waterblocks.
Steam=gas
Atomized water=gas
BUT...something is missing in the equation

I know what it is..Do you?
I will be doing a prototype soon, when my machinist gets done with my base plate. I will have more soon.
Tuff