Yes, Cray, IBM, HP have all used liquid cooling in the past, normally with exotic fluids (get out the chemistry notes). The major difference is that most previous systems were plumbed up like a house. Servers in racks need to be hot swappable or physically removable from the system.
Yes, they are a type of scaled down hydraulic coupling. The primary difference is in their performance. Hydraulic couplings are notoriously bad at slowing down the fluid. This is definitely not good for cooling.
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Yes, Cray, IBM, HP have all used liquid cooling in the past, normally with exotic fluids (get out the chemistry notes). The major difference is that most previous systems were plumbed up like a house. Servers in racks need to be hot swappable or physically removable from the system.
Yes, they are a type of scaled down hydraulic coupling. The primary difference is in their performance. Hydraulic couplings are notoriously bad at slowing down the fluid. This is definitely not good for cooling.