Quote:
Originally posted by unregistered
the title of the article is "Waterblock Bench Testing Results"
to see it send an e-mail to Joe Citarella and ask him when it will be up
an excerpt just for you:
An interesting situation exists with the Swiftech 462-U and the 462-UH as they are the same wb, but with different connection sizes. Comparing their "C/W"s it is easy to see that flow per se does not do the 'cooling', else their positions would be reversed. To look at the effect of inlet flow velocity (more accurately die area impingement velocity), in place of the very large bore (0.57 in. ID) inlet connection initially tested with the 462-UH, a Swagelok barbed connector with a 0.39 in. ID was substituted. The outlet was not changed and the standoff from the bp surface was the same for both (but greater than the 462-U). It can be seen that the performance of the 0.39 in. ID inlet is substantially improved over the larger connection having lower impingement velocity.
Chart 4
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Played with Flomerics' Jet Impingement
http://www.coolingzone.com/Content/D...as/fcalc10.htm and Waterloo
http://www.mhtl.uwaterloo.ca/old/onl...ce/strip2.html
Obtained an estimate of the variation in h with velocity for 0.39" and 0.57"nozzle
Although the "r" and "H" values are otside the limits for the 0.57" nozzle the program does give answers.
Used the values of"h" in Waterloo for a 60x60x8mm bp with a 10x10mm heat source:
Allowing a TIM C/W of ~0.1 this shows remarkable similarity to Bill Adams's experimental data.