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Yes, but what exactly is the result of those gaps? Wouldn't it also allow air to escape? If it doesn't, why does it affect resistance so much?MikeC wrote:The Mugen does not have a monolithic fin stack; it has 5 fin stacks separated by air gaps of 3~4 mm between them. That makes it very different, the airflow resistance is far lower than a single fin stack of the same overall size.
I would also be interested in learning more about how a short stack impedes flow less than a long one, as asked by Olaf. SPCR has an article on the properties of fans, but not so much one on heatsinks - the information is sort of scattered, and I could not find it in the Recommended or the Mugen 2 article.PS. Since it's 2012, I wish reviewers would have studied each other more by now and thus learned better practices. Expecting active collegial dialogue in this non-industry - or even standardisation - would be a bit much of course. Some people have been in the business longer and take it seriously, and that is why I keep going back to them. I still compare them to the rest, but "the rest" have largely stayed or been regularly replaced by hobbyists with no ambition or expertise, simply garnering experience from doing and seeing others do, but not necessarily learning from either - learning is, after all, an active process that takes motivation, work, and criticism.
I disagree.Das_Saunamies wrote:If I were to hazard a guess, I would think that as "excess" pressure is vented from the slits, there is less back pressure building up to resist the movement of the airflow, provided that the fan creates sufficient force to push the air along. This got me thinking of muzzle brakes you see on guns, using the force of redirected gas to compensate for recoil, although the intent is probably different here, but it reminded me of "to every action there is always an equal and opposite reaction."
In my short search while killing time I didn't come across any good reading on impedance, so I guessed based on what I knew. And impedance is a vague area for me at best, as I haven't seen it explained well so far.ces wrote:I disagree.Das_Saunamies wrote:If I were to hazard a guess, I would think that as "excess" pressure is vented from the slits, there is less back pressure building up to resist the movement of the airflow, provided that the fan creates sufficient force to push the air along. This got me thinking of muzzle brakes you see on guns, using the force of redirected gas to compensate for recoil, although the intent is probably different here, but it reminded me of "to every action there is always an equal and opposite reaction."
My hazard of a guess is that those gaps cost some fin area. But in return they provide less impedance. The impedance is what encourages the cool air to circulate elsewhere.
What do you think of the idea of placing paper around the sides of a CPU cooler?MikeC wrote:But you can feel a lot of airflow coming through from the sides of the stack (ie, perpendicular to the fan), as well as around the periphery of the fan where it meets the fin stack.
I trust you mean so that the air cannot flow out the sides of the fin stack? It would force more of the airflow through the center, but this depends a lot on the details. If the fin stack was especially dense w/ narrow spacing, that might just create more back pressure.ces wrote:What do you think of the idea of placing paper around the sides of a CPU cooler?MikeC wrote:But you can feel a lot of airflow coming through from the sides of the stack (ie, perpendicular to the fan), as well as around the periphery of the fan where it meets the fin stack.
Yes that what I mean.MikeC wrote:I trust you mean so that the air cannot flow out the sides of the fin stack? It would force more of the airflow through the center, but this depends a lot on the details. If the fin stack was especially dense w/ narrow spacing, that might just create more back pressure.
It's worthwhile if you want to know what happens -- regardless of the type of tower HS you have.ces wrote:Do you mean that this might be a worthwhile experiment if you have wide fin spacing, or some trick to otherwise keep impedance down such as the Mugen and the Prolimatech Megahalens use?
Seems like it would be very very interesting toMikeC wrote:I trust you mean so that the air cannot flow out the sides of the fin stack? It would force more of the airflow through the center, but this depends a lot on the details. If the fin stack was especially dense w/ narrow spacing, that might just create more back pressure.ces wrote:What do you think of the idea of placing paper around the sides of a CPU cooler?MikeC wrote:But you can feel a lot of airflow coming through from the sides of the stack (ie, perpendicular to the fan), as well as around the periphery of the fan where it meets the fin stack.
Yeah, glad someone else spotted this. Outliers require that you've used the same method to collect all the data. If you collect 1/3 of your data with controls and accurate equipment, and then 2/3 with a potato, it does not follow that the potato data is right.DAve_M wrote:Well you can't cross compare the results from different sites. Or you are trying to say that only SPCR gave a bad review, therefore implying that only SPCR is wrong? Well you should focus on attacking the SPCR testing methodology instead if you want to go down this route. Why other sites fail so hard is not for SPCR to investigate or care about.Chris@bequiet! wrote:You can see that every other test is completely at odds with the SPCR result which makes it a true outlier.