Many small tubes -VS- One large tube

Gamez · 12-09-2003, 01:55 PM

I am designing my water cooling system, but I need it to be fairly low profile.

I am wanting to run the same as a 3/4" tube, but with three 1/4" tubes. (Inside dimensions)
03.33
I like the acrylic splitters that Bladerunner uses.

Will running mulitple smaller tubes cause any problems with watercooling?

I am not looking for total extreme cooling, but a small slim cooling block.

Tempus · 12-09-2003, 02:04 PM

3- 1/4" tubes have significant less flow rate then one 3/4" tube

Just use pi*r^2 to figure out what the cross section is. That will give you a good idea.

I use a simple rule of thumb - you need 2x as many as the next commonly used size down.

1" line needs two 3/4"
3/4" needs two 1/2"
etc
its very rough but will easily keep you from getting a flow bottleneck.

Gamez · 12-09-2003, 03:41 PM

Basicly I don't like the look of large tubes coming into the top of a CPU.

I would like the water to come into the sides of the block, but keep the block thin.

I also want to create something similar to cascade and use the jet tubes.

Here is my idea's so far.

-------------

Start with a Cascade style base.

-------------

The middle layer has the jet tubes and outlet channel

-------------

The third layer has the inlet and outlet channels and tubes.

-------------

From above you can see the jet tubes and channels.

Tempus · 12-09-2003, 09:32 PM

VERY nice looking cad work man.

Incoherent · 12-09-2003, 10:20 PM

The only possible problem/effect I see you getting is uneven flow in the tubes, which might impact the flow through the block. Probably not at all significant though.
I like your idea Gamez. What is the application? A 1U/2U rack box?
Do you have clearance around the CPU socket for this kind of approach? It would be a shame to have to have sharp 90°'s right at the in/outlets.
Wonderful CAD work BTW.

Cheers

Incoherent

superart · 12-09-2003, 10:38 PM

what is that backwords-C looking part for?

Tempus · 12-10-2003, 12:05 AM

It looks like that is the out flow zone.

BladeRunner · 12-10-2003, 07:36 AM

That should be fine but you'd need more 1/4"s to match up to 3/4"

I worked mine out in millimetres as it's easier for me.

my input tube inside diameter is 12mm at the worst restriction (pump outlet),

Using

(pi = 3.1416), to work out the area of the circle cross-section of the tube id.

x radius squared = area.......... so 3.1416 x 36 = 113mm

my outlets from the splitter-X Cpu block are 6mm id

3.1416 x 9 = 28.3mm

so I have 4 of these 28.3 x 4 = 113mm

Of course there will be some slight extra losses due to the outlets having more surface area in contact with the coolant which in theory will add to the overall flow restriction.

if you are using 3/4 and that's a id ?? then you'd need to do the equation to work out outlet sizes, if you consider mine then using 3 x 1/4 with your inlet tube will cause a restriction.

It also depends on other factors like pump flow restrictions in the other system blocks etc etc.

You may benefit more from a pinned based design as you wont get a cascade effect without a top entry and the cup tubes.

superart · 12-10-2003, 09:02 AM

Quote:

Originally posted by Tempus
It looks like that is the out flow zone.

So water comes in from the left? Wouldnt that trap stagnant water inside the c?

msv · 12-10-2003, 09:12 AM

Don´t think so. It looks like a lot of water outlets to the C.
regards
Mikael S.

Tempus · 12-10-2003, 01:38 PM

as per pic 3.

Water comes in on the middle left and hits the cups and then "spills" out the sides to the ends of the C. The outflow is on the bottom right so it pulls from the rest of the C and moves most (all) of it.

12-09-2003, 01:55 PM	#1
Gamez Cooling Neophyte Join Date: Nov 2003 Location: Tejas Posts: 8	Many small tubes -VS- One large tube I am designing my water cooling system, but I need it to be fairly low profile. I am wanting to run the same as a 3/4" tube, but with three 1/4" tubes. (Inside dimensions) 03.33 I like the acrylic splitters that Bladerunner uses. Will running mulitple smaller tubes cause any problems with watercooling? I am not looking for total extreme cooling, but a small slim cooling block.

12-09-2003, 02:04 PM	#2
Tempus Cooling Savant Join Date: Jul 2003 Location: Michigan, USA Posts: 456	3- 1/4" tubes have significant less flow rate then one 3/4" tube Just use pi*r^2 to figure out what the cross section is. That will give you a good idea. I use a simple rule of thumb - you need 2x as many as the next commonly used size down. 1" line needs two 3/4" 3/4" needs two 1/2" etc its very rough but will easily keep you from getting a flow bottleneck. __________________ Thou art God.

12-09-2003, 09:32 PM	#4
Tempus Cooling Savant Join Date: Jul 2003 Location: Michigan, USA Posts: 456	VERY nice looking cad work man. __________________ Thou art God.

12-09-2003, 10:38 PM	#6
superart Cooling Savant Join Date: Mar 2002 Location: FL Posts: 787	what is that backwords-C looking part for? __________________ When you do things right, people won't be sure youv'e done anything at all. Looking to buy/trade for used Deep Fryer and Vacume Pack Sealer.

12-10-2003, 12:05 AM	#7
Tempus Cooling Savant Join Date: Jul 2003 Location: Michigan, USA Posts: 456	It looks like that is the out flow zone. __________________ Thou art God.

12-09-2003, 03:41 PM	#3
Gamez Cooling Neophyte Join Date: Nov 2003 Location: Tejas Posts: 8	Basicly I don't like the look of large tubes coming into the top of a CPU. I would like the water to come into the sides of the block, but keep the block thin. I also want to create something similar to cascade and use the jet tubes. Here is my idea's so far. ------------- Start with a Cascade style base. ------------- The middle layer has the jet tubes and outlet channel ------------- The third layer has the inlet and outlet channels and tubes. ------------- From above you can see the jet tubes and channels.

12-09-2003, 10:20 PM	#5
Incoherent Cooling Savant Join Date: Sep 2003 Location: Vallentuna, Sweden Posts: 410	The only possible problem/effect I see you getting is uneven flow in the tubes, which might impact the flow through the block. Probably not at all significant though. I like your idea Gamez. What is the application? A 1U/2U rack box? Do you have clearance around the CPU socket for this kind of approach? It would be a shame to have to have sharp 90°'s right at the in/outlets. Wonderful CAD work BTW. Cheers Incoherent

12-10-2003, 07:36 AM	#8
BladeRunner Cooling Savant Join Date: Jul 2001 Location: Chesterfield Uk Posts: 459	That should be fine but you'd need more 1/4"s to match up to 3/4" I worked mine out in millimetres as it's easier for me. my input tube inside diameter is 12mm at the worst restriction (pump outlet), Using (pi = 3.1416), to work out the area of the circle cross-section of the tube id. x radius squared = area.......... so 3.1416 x 36 = 113mm my outlets from the splitter-X Cpu block are 6mm id 3.1416 x 9 = 28.3mm so I have 4 of these 28.3 x 4 = 113mm Of course there will be some slight extra losses due to the outlets having more surface area in contact with the coolant which in theory will add to the overall flow restriction. if you are using 3/4 and that's a id ?? then you'd need to do the equation to work out outlet sizes, if you consider mine then using 3 x 1/4 with your inlet tube will cause a restriction. It also depends on other factors like pump flow restrictions in the other system blocks etc etc. You may benefit more from a pinned based design as you wont get a cascade effect without a top entry and the cup tubes. __________________ Zero Fan Zone Last edited by BladeRunner; 12-10-2003 at 08:34 PM.

12-10-2003, 09:12 AM	#10
msv Cooling Savant Join Date: Dec 2002 Location: Sweden Posts: 336	Don´t think so. It looks like a lot of water outlets to the C. regards Mikael S. __________________ The only constant factor in all Your failures is You. Catapultam habeo. Nisi pecuniam omnen mihi habis, ad caput tuum saxum immane mittam.

12-10-2003, 01:38 PM	#11
Tempus Cooling Savant Join Date: Jul 2003 Location: Michigan, USA Posts: 456	as per pic 3. Water comes in on the middle left and hits the cups and then "spills" out the sides to the ends of the C. The outflow is on the bottom right so it pulls from the rest of the C and moves most (all) of it. __________________ Thou art God.

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