[jaydee]

Finally found the post I been looking for. Couldn't remember which thread it was in. This explains the impingment effect some.

Originally posted by leejsmith
i made these simulations using real flow and it shows the advantage of the cup base over a drill shape and flat.

first flat base dimple



next drill bit shape base



and last cup base



you can see the cup shape helps the water flow out of the dimple quicker over the same period of time in this case 11 frames with the same water jet in each simulation.

Hope this helps

Lee

From this thread: http://forums.procooling.com/vbb/sho...5&pagenumber=7