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Noiseblocker NB-eLoop 120mm Bionic Loop Propeller Fans - Page 13

post #121 of 159
i read earlier in this thread these fans are not really suited to a pull config on a radiator due to the increase in noise, but mentioned the use of a shroud, does anyone know if a 20mm shroud in pull configuration on an rx480 would yeld a good result?

I'm considering the 800rpm version to keep the fan speed and conversly the noise to a minimum
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post #122 of 159
Anyone tried to sleeve this fan? Also, goddamn it, how do you remove the rotor? It resists so strong that I'm afraid it will break. frown.gif
Edited by adi518 - 3/2/13 at 1:06pm
post #123 of 159
Anyone hear any new word on the 140mm model yet?

Also as per reading this forum and seeing that these fans should not be used behind a dust filter or in pull position, I was wondering if gaskets (such as Phobya Gasket) were applied will they reduce that annoying hum? I'm planing to do a custom loop using a 240x30mm radiator and fans in push/pull set up. I really love the look of these fans and I am deciding between either the eLoop B12-P or GT AP-15.
post #124 of 159
Quote:
Originally Posted by KoopaTroopa View Post

...in pull position, I was wondering if gaskets were applied will they reduce that annoying hum?

I doubt it. Presumably the drone develops in pull configuration because of negative pressure in front of the blades (i.e. on the pull side) and some sort of odd resonance or vibration on the leading fan edge that results. A gasket would actually increase the pull load because it constrains the airflow to your area of greatest impedance, viz. the radiator. I would bet a gasket would therefore increase the drone (as opposed to mounting the fan with "free air" around the edges).

However, this is pure speculation. The drone may be due to some more complex fluid flow than I am assuming. For instance, if the relative availability of air around the edges vs through the center of the rad caused a pressure gradient from fan tip to hub center, perhaps that would be the source of the drone., in which case a gasket would solve the issue (by flattening out the pressure gradient). You would need to test to be sure. My instinct, however, is that the first hypothesis is correct, and a gasket will worsen the issue.

Basically, you should consider the B12 series to be for push only unless you are willing to experiment with some high-price fans.
Edited by Gabedamien - 5/20/13 at 7:31pm
post #125 of 159
Quote:
Originally Posted by Gabedamien View Post

I doubt it. Presumably the drone develops in pull configuration because of negative pressure in front of the blades (i.e. on the pull side) and some sort of odd resonance or vibration on the leading fan edge that results. A gasket would actually increase the pull load because it limits the airflow to your area of greatest impedance, viz. the radiator. I would bet a gasket would therefore increase the drone (as opposed to mounting the fan with "free air" around the edges).

However, this is pure speculation. The drone may be due to some more complex fluid flow than I am assuming. For instance, if the relative availability of air around the edges vs through the center of the rad caused a pressure gradient from fan tip to hub center, perhaps that would be the source of the drone., in which case a gasket would solve the issue (by flattening out the pressure gradient). You would need to test to be sure. My instinct, however, is that the first hypothesis is correct, and a gasket will worsen the issue.

Basically, you should consider the B12 series to be for push only unless you are willing to experiment with some high-price fans.

Thank you for the response and for being very informative. However, please excuse my ignorance when I ask would then would using a gasket on both sides of the radiator actually increase the dBa level of any fan?

I just don't wish to buy something without having the right information regarding it's true effectiveness.

I'm really hoping they come out with the 140mm editions soon because I would love to have the eloop as an exhaust fan in my build at least.
post #126 of 159
Quote:
Originally Posted by KoopaTroopa View Post

Thank you for the response and for being very informative. However, please excuse my ignorance when I ask would then would using a gasket on both sides of the radiator actually increase the dBa level of any fan?

No, normally a gasket or shroud should in theory increase the effectiveness of the radiator (and possibly reduce the noise) because you are preventing air "leakage". In reality the effect on noise is probably immeasurably small and may be offset by vibrational noise coupling from the fan to the rad. Also, restricting the air leakage around the sides may have a slight beneficial effect with respect to the rad's cooling effectiveness but may also reduce the splash cooling effect to other areas inside the case (e.g. motherboard VRMs). So it is not a simple universal truth that a gasket is always better.

In the case of the B12 with its pull drone, however, I was surmising that a gasket may actually make it worse. That is a special case.
post #127 of 159
Quote:
Originally Posted by Gabedamien View Post

No, normally a gasket or shroud should in theory increase the effectiveness of the radiator (and possibly reduce the noise) because you are preventing air "leakage". In reality the effect on noise is probably immeasurably small and may be offset by vibrational noise coupling from the fan to the rad. Also, restricting the air leakage around the sides may have a slight beneficial effect with respect to the rad's cooling effectiveness but may also reduce the splash cooling effect to other areas inside the case (e.g. motherboard VRMs). So it is not a simple universal truth that a gasket is always better.

In the case of the B12 with its pull drone, however, I was surmising that a gasket may actually make it worse. That is a special case.

Thank you very much.

+1
post #128 of 159
I have tried with Eloop. I think in pull configuration the drone is due to the air passing through the narrow gap with the restriction of filter or rad.

Then, the shroud will solve this problem as it is also suggested from Noiseblocker.
post #129 of 159
a shroud will definately help with the Problem.
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post #130 of 159
Agree shroud will help.thumb.gif
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