can I use "regular" green antfreeze???

S

spruce

Banned for Name Calling - Care to join me?
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I have a " green theme" going and I'm wondering if I can use green antifreeze?. I had some red stuff but it does not dye very well.

btw the cpu block is a d-tek ww copper/aluminum block.
 
It will also degrade performance. Antifreeze is viscous, it increases the viscosity of the water, and thus decreases the flow rate ... go buy some dye :)
 
Only use a 5-10% it shouldnt degrade it that much. Or you can use hydra X from swiftech.
 
I thought HydrX was antifreeze?

from having to siphon prime my loop a few times in the past...tehy sure do both taste the same :(
 
HydrX, yeah good recommendation, I'd forgotten about it. It has all the anti-corrosion chemicals of anti-freeze, but has a lot less of the viscous glycol.
 
mustang_steve said:
I thought HydrX was antifreeze?

from having to siphon prime my loop a few times in the past...tehy sure do both taste the same :(
Click to expand...


you nasty.
 
It could just be diluted antifreeze...I mena I really did taste the glycol...that's a taste I'd rather not experience again. It's somehow bitter, sweet, rancid, and sour at the same time....it's the most disgusting taste ever. Actually I should ask Jelly Belly to make antifreeze flavored jellybeans...but I doubt anyone wonld volunteer for taste comparison... :p


....yes, I'm a sick puppy.
 
Hmm, ok so hydrX is antifreeze with a few agents added to it...not to mention the stuff is grossly toxic. I thought anything that is toxic was required to have a warning label on the bottle.
 
what about distilled water and water wetter? im getting GREAT temps with that combo WW is about 10 percent
 
Water wetter eats some plastics. (gums out inside of tubing and pops off your barbs)

Thats the reason I wouldnt use anything other than whats been made specifically for watercooling, (InnovaProtect, Hydrx, etc)
 
I use it in a 50/50 mix cause that's what was in the prestone bottles in my garage :/ . I'm rethinking my logic though now that i'm reading that antifreeze is pretty viscous. I'll probably look into water wetter+water+alcohol to kill algae. And i'll agree that antifreeze does not taste good at all...and you get that aftertaste in your mouth for like a half an hour. Its horrible.
 
the increased viscosity and density of a 10% solution would make a +1.6% difference in the Reynolds number of the flow, this would increase the heat transfer coefficient by 1.5% and decrease flow bysomewhere close to the same. the higher viscosity isn't going to hurt you any more than it will help
 
The only good thing that i have found about antifreeze is that it does have some insulative properties when it comes to electirical components i had a mix when i first started in watercooling playin with different mixes of Alchol, anitfreeze and water. My homemade res blew up with the mix in it and dumped fluid all over both of my power supplies .... my 520 has a top fan and since the res was sitting on top of it (its a double sided server case, so the res and psu's were not on the board side) the mix was splattered all over the case and psu's and the thing ran for half a day like that until i got home and found my case full of fluid. :eek: However, unless u expect ur res to blow up i would recomend hydrex or just use some green dye that u can buy from countless sites. It is low viscocity and since it is alchol based it will restrain growth of anything bad in ur loop. I just use the dye and have never had anything growing in my tubes at all. :D
 
TwEaKd said:
the increased viscosity and density of a 10% solution would make a +1.6% difference in the Reynolds number of the flow, this would increase the heat transfer coefficient by 1.5% and decrease flow bysomewhere close to the same. the higher viscosity isn't going to hurt you any more than it will help
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what about a 50/50 mixture? :D
 
TwEaKd said:
the increased viscosity and density of a 10% solution would make a +1.6% difference in the Reynolds number of the flow, this would increase the heat transfer coefficient by 1.5% and decrease flow bysomewhere close to the same. the higher viscosity isn't going to hurt you any more than it will help
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Show how you calculated that.
 
Here are some of my calculations, I was a little off on that first post. But these figures are correct. As far as the 50/50 mixture goes, that is going to cut your flow by 1/3. I am using pure ethylene gloycol figures, I'm not sure what the composition of anti-freeze is. One thing I haven't taken into account is the specific heat or how much heat the liquid can hold. water's specific heat is nearly double that of ethylene glycol's. If you add more anti-freeze, your system will move less liquid that can hold less heat. I can't confirm it, but I have also heard that it conducts electricity slightly. In conclusion, I think that using anti-freeze won't hurt your performance much if any, but only use as much as is needed.

All properties are calculated at 27 C
Visc water 0.000855 N*s/m2
Density water 997 kg/m3
Therm cond 0.613

Visc ethy-gly 0.0157 N*s/m2
Density ethyl-gly 1114 kg/m3
therm cond 0.252


Reynolds number= density*veloc*diam
viscosity

assuming velocity and diameter stay relatively close to each other

Water 1166081.871 *velocity*diameter
ethylene gylcol 70955.41401 *velocity*diameter

16.43400842 times as high
10% solution 1.643400842 times as high

heat transfer coefficient is calculated using (Reynolds number)0.8
and the thermal conductivity of the fluid, which is about twice as much for water
1.301523718

Heat transfer is 30% higher with a 10% solution
Using the turbulent flow equation and the Moody chart, (trust me on this one)
The flow rate will be reduced by about 5 or 6 %
 
TwEaKd said:
Water 1166081.871 *velocity*diameter
ethylene gylcol 70955.41401 *velocity*diameter

16.43400842 times as high
10% solution 1.643400842 times as high
Click to expand...
Ahhh, there it is. The Reynolds number is higher with water than glycol, but you're saying it's even higher than water with 10% glycol...
heat transfer coefficient is calculated using (Reynolds number)0.8
and the thermal conductivity of the fluid, which is about twice as much for water
1.301523718
Click to expand...
Are you calculating your Nusselt number with 0.8*Re or Re^0.8? And you have to take into account the change in the Prandtl number from the changes in both thermal conductivity and specific heat, can't just use conductivity.
Using the turbulent flow equation and the Moody chart, (trust me on this one)
The flow rate will be reduced by about 5 or 6 %
Click to expand...
The pipes/tubing/blocks we use generally have a relative roughness <0.0001. If you look at your Moody diagram, you'll see that flow won't become fully turbulent until Re>10^6. We operate solidly in the transitional realm where the Darcy friction factor increases rapidly with decreased Re.
 
HeThatKnows said:
Ahhh, there it is. The Reynolds number is higher with water than glycol, but you're saying it's even higher than water with 10% glycol...

Are you calculating your Nusselt number with 0.8*Re or Re^0.8? And you have to take into account the change in the Prandtl number from the changes in both thermal conductivity and specific heat, can't just use conductivity.
The pipes/tubing/blocks we use generally have a relative roughness <0.0001. If you look at your Moody diagram, you'll see that flow won't become fully turbulent until Re>10^6. We operate solidly in the transitional realm where the Darcy friction factor increases rapidly with decreased Re.
Click to expand...

Someone just got burned...

Jeff
 
Heck, I just run a 5-10% mixture of blue antifreeze and distilled water. I like the color better than using the green "stuff". Seems to work ok for me.

(I got the blue antifreeze from a VW / Audi dealership here in town).
 
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