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Custom CPU Waterblock

post #1 of 7
Thread Starter 
Hi guys

I saw some threads here at overclock.net of people having a go at designing and making their own blocks (particularly http://www.overclock.net/water-cooling/504771-custom-water-block.html - an interesting read).

As a result I thought I would use my limited knowledge of Autodesk Inventor to design my own. To prevent future dissappointment I will say now that I will probably not actually be making it becuase although I do have access to a lovely CNC milling machine, I doubt it has a tool small enough to cut my... unique microchannels.

Also I have a very limited knowledge of how water and heat behaves in a waterblock (just using common sense and what I've learnt from the internet over the past few years tongue.gif ) so I have no idea how well it would perform.

Anyway, that doesn't mean I don't want feedback to perhaps make the design better, you guys know more than I do smile.gif

Now, lets get to some screenshots, if you bothered to read the above wink.gif

It's just the base so far, the dimensions of which are 55*55*5.5 (I like 5). The thickness of the very bottom is a slender 1.25mm, which is probably too thin (can be adjusted, I haven't added any bow yet). The holes are for M3 bolts.

8fDZL.png?3838

Below you can see the small recessed part better where the injection plate for the inlet sits (if that is the correct word). The inlet will is slightly offset to the right of the center (despite the injection plate being [pretty much] central - the injection holes will also be offset - it will become clear as I model it). The outlet will be on the left hand side, but water can flow to the right and come back around via the top and bottom, without too much restriction (hopefully).

D7Cls.png?3838

You can also see the microchannels, of which there are 27. The channels and fins are both 0.5mm with a depth of 3.25mm.

I was thinking about putting gaps in the zig-zags like this, to increase turbulence AND flow:

fJDFz.png?449

What do you guys think, better without? (obviously above there is only one gap for demonstration, it would be in every zig-zag for real, if you know what I mean[probably not, I suck at wording])

The recesses for O rings will be in the top, which will probably be acrylic or plexi. Obviously the placement of these will be shown when I design the top / injection plate tongue.gif, but you can probably guess.

I will make an engineering drawing to display dimensions better later on.

I understand if you have no idea how it works yet... I'll keep going so I can make sense of it better. I wrote this thread late with a few beers in me, so it may not be clear and concise. Updates soon.
Edited by wpjiscool - 8/21/11 at 3:40pm
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post #2 of 7
the zig zgas will prolly cause a lot of turbulance.
you're better off making a straight path through the fins or using a "pin" design instead (these cause turbulance as well but disipate heat very well)
post #3 of 7
Quote:
Originally Posted by Hazzeedayz;14673090 
the zig zgas will prolly cause a lot of turbulance.
you're better off making a straight path through the fins or using a "pin" design instead (these cause turbulance as well but disipate heat very well)

turbulence is only a problem if you don't have high enough pressure

if designed properly it can aid in the heat transfer to water, if not it can make for places where water stagnates in the block and over saturates with heat, it's why most waterblocks use jet plates to focus the water through the channels in the block, though to simulate this properly you'll need a good understanding of fluid dynamic and a floating point flow simulator. . .
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by Hazzeedayz;14673090 
the zig zgas will prolly cause a lot of turbulance.
you're better off making a straight path through the fins or using a "pin" design instead (these cause turbulance as well but disipate heat very well)

My third pic shows a more pin style approach, although still zig-zagged so it would still have loads of turbulence.

Quote:
Originally Posted by somebadlemonade;14673175 
turbulence is only a problem if you don't have high enough pressure

if designed properly it can aid in the heat transfer to water, if not it can make for places where water stagnates in the block and over saturates with heat, it's why most waterblocks use jet plates to focus the water through the channels in the block, though to simulate this properly you'll need a good understanding of fluid dynamic and a floating point flow simulator. . .

Yeah I was sort of aiming for a more restrictive but high performance block, sort of like the original EK Supreme but more unique.

There is a possibility that I could make it now (the workshop now has a laser cutter on the way, apparently). This is the only realistic way I could test it. However I'm busy in the coming months so its still only a possibility.


Anyway here is some more pics of the complete thing bar mounting hardware. There are some bits I want to tweak, but i think it looks pretty good.

30oio.jpg
Delrin top

TanQL.jpg
Acrylic top - you can see the insides easier.

IQMHK.jpg
Underside of the top.

I'm going on holiday tomorrow so I've got that to sort, so there may not be an update for a while.


EDIT: OOPS, just realised the injection plate is the wrong side up, I'll have to fix that.
EDIT2: Fixed but there is barely any visible difference in the pics so I'll leave it.
Edited by wpjiscool - 8/22/11 at 1:11pm
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post #5 of 7
Be careful, depending on your fittings those in/out holes might be too close (judging from the pictures.)
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post #6 of 7
Quote:
Originally Posted by Azarah;14678945 
Be careful, depending on your fittings those in/out holes might be too close (judging from the pictures.)

that's what i was thinking
since your building it yourself you should elbow the inlets out.
then you'd be able to use compression fittings and such.
post #7 of 7
you should run some flow sims before machining part. as this looks like fairly flow killing to me.
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