The pin-grid is indeed the best known ,to me anyway, for chilling a sluge.... It is the reason Why I came to my design in the first place. The other benifits was just cherry on the cake,
do keep in mind, that Delta-T is inversely proportional to the time spent in any particular location.... thus, the longer the substance stay in that location, the smaller DT will become... this is true for any initial DT value, and therefor high flow will always get you better thermal transfer, by virtue of the fact that DT is maximized.
Do, however not link this, with the ability to sustain "high flow".... and it is In there that lies the reason why chillers tend to revert to a "low-flow" senario, only because it's more work to push a sluge through a pipe.... [M2C]