this gd pos forum software won't hold a post while the window is being reused
bigass time waster

Les

1) my suggestions were to reverse the cross-sectional flow area 'ratio' over the die area when flowing corner to corner (narrow-wide-narrow to wide-narrow-wide, relatively of course)

this, across an optimized surface, will test the turbulent parallel flow scheme

jet impingment normal to the bp will certainally produce turbulence, the problem is that at our 'level' of testing we cannot easily demonstrate which is better
and cannot 'calculate' anything at all relating to such

I have all the wb test pieces to quantify flow rate/nozzle velocity/wb 'thermal resistance'; just doing other things right now

2) not my bag, good luck

3) doing goop testing 20hrs a day (Cooling Flow is better for testing), and just added another
http://www.evertech.com/category.cfm?Category=60
typical confusion (about testing) here
this review was fairly well done
(looks like I need to do an article on goop testing, jk)

be cool

myv65,

I am waiting to read your new articles on amdmb (the old ones are very good, imho!). I have one question (maybe, for your upcoming rad/wb article): My impression is that a waterblock and a radiator are very similar devices, from the heat exchange point of view. The only difference is in size. So if you write What you *do* need is high convection, aka high velocity in the block, doesn't the same apply to radiators as well? Implying BI original is better than BI pro...

Sirpent,

They are certainly similar, though the few differences are dramatic. A block must receive a large amount of energy through a relatively small area. It must then transfer this heat via conduction where a fluid picks it up via convection. A radiator also has three processes. It's convection from the liquid to the tubing, conduction through the tubing to the fins, and convection from the fins to the air.

So each takes heat input from a small area (region contacting the chip, ID of radiator tubing contacting fluid) and conducts it to a much larger area (surface area inside block passages, surface area of radiator fins). Due to vastly different properties from air to water, the convection across the radiator fins easily can become a bottleneck. I'm going to talk about each of these thermal resistances in a whee more depth during the article.

and to pick nits a bit,

there is an additional gradient across the soldered (or, worse yet - just mechanically swedged) tube/fin connection

be cool