@ quickmcj,
Any straight conversion of an air-cooled heatsink to liquid cooling will not be optimal. Air cooling requires a lot higher ratio of surface area simply due to the low convection coefficients that you get with gas versus liquid. In other words, the fins/pins of an air-cooled heat sink are a lot longer/taller than they need to be for use with liquid cooling.
It will work just fine, but will not be the most efficient of designs.
If you wish to create a system designed for extremely low flow rates (low convection coefficients) then this may be a good place to start. I'm talking on the order of 5 gph (~14 lph). It would result in a greater temperature rise in the water, but still perform on par or better than using a high-rpm Delta fan.
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