Ah, you meant heat. You originally said water molecules pick up other molecules, which made me go
Assuming each molecule can pick up a certain amount of heat, taking into account inefficiencies, the more molecules you have impacting the die surface in a given period, the more heat can be removed - thermal transfer efficiency for a set silicon/water molecule pair decreases exponentially over time. Even if silicon wafers are hydrophilic, there isn't some set number of molecules that will be "allowed" to contact the surface - you've just got to overcome additional inefficiencies caused by the repulsion of X water molecules.
Although really, any hydrophilic effect will be miniscule in comparison to the surface-area issue.
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