My earliest recollections are Bill's post
here :-
" jeeez, now that guy's started a new thread
offering free samples
and asking where there is a forum that is un-critically accepting
not here, babe
Ice Czar, wrt wbs:
We are probably looking at the same parameters, but I would describe them differently
3 "generic' wb designs
- labyrinth (MazeI)
- finned (OCWC home-made)
- die area impingement (MCW462)
despite the many pronouncements, it (to me) is still very much unresolved which type might be (able to be) called "superior"
but some few facts are known:
5 or 6 years ago Intel published a paper (which is on Google, lost the URL) comparing labyrinth and finned wbs for (large) server applications, and they concluded that finned were better due to the reduced pumping requirements. As I recall the cooling, per se, was not a determining factor.
This would at least suggest that the design parameters available for manipulation for those 2 will yield similar results. (And looking at your listed variables it can be reasonably supposed.) Note that in a systemic watercooling system evaluation the pumping requirements are hugely important, yet in looking at only the wb the pump head losses attributable to the wb are often not quantified.
Which leaves the dai (die area impingement) type, of which the POS waterbox that is the subject of this thread is another variant. (It should be noted that there are many hybrid designs also, MazeII etc.) Is there any reason to suspect that this type might be superior ?
Yes indeed.
Much difficulty is caused by sloppy terminology, and the use of the engineering term "turbulent" is a case in point. Turbulent flow is a mathematically described condition, yet is used by many as a synonym for a "mixing" type of flow. The enhanced heat transfer benefits that are applicable to the truly "turbulent" flow are substantially higher than the benefit from better mixing of the fluid.
Turbulent flow is a consequence of velocity, and is affected by the surface roughness. While turbulence may be induced by a change in direction, such will not (normally) change the flow regime. It is a fact that turbulent flow cannot be achieved in a labyrinth or finned wb (with any reasonably sized pump), but it can be in a dai type wb.
I've just started wb testing, but the results are startling.
be cool
IP: Logged
11-24-2001 07:09 AM "