Well... it seems nobody is interested in this topic ...
Or maybe it has been discussed before...?
Btw ..I'll drop in a few questions here that i hope will get the attention of some one...
In order get a jet impingement wb to cooldown a larger area, we may choose 2 aproaches.
The first is to add more nozzles but shrink the diameter of the holes of the nozzles so that the cross sectional area of the new holes are the same with the initial holes on the nozzles of the original cascade design( to maintain the same velocity of the fluid)
This approach may reach a limit as to how small can we drill the holes in the nozzles. The disadvantageous of this approach is that as the nozzles get smaller the resistance of the wb will become larger, implying greater preasure drop
the 2nd aproach is to stick with the same number of nozzles and spread out the jet array so that it covers a larger area. This approach may have some disadvantage of the cooling area being localized only at the spots where the jet is positioned.
In the case of spreading out the jet array in a cascade to accomodate a larger cooling area, is there need to widen the cavity at the baseplate to get maximum area that reacts with the boundary layer created by the jet impingement.
Or just leave the cavity diameter as it is and just spread it out according to the position of the spreded out jets.
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