Design improvements - Page 2

winewood · 09-09-2003, 04:02 PM

actually.. no. Without a path to direct flow over an area, turbulence will not do anything really. Think baseball. The runners will follow the bases. Same with water, the path of least resistance. If you know the water is being routed over an area, the key is to place the turbulence under that flow. Try this, make your ) a U by lengthening the arms of it. Then place turbulence along the path as it goes back to the outlet. This is the only way I see that working.

Tens0r · 09-10-2003, 01:33 AM

i think any fins outside the core area are a bit unesscessary as all the do is slow down flow and majority of the heat will not even make it to them.

not to mention costly machining time on a CNC and programming.

grassi3000 · 10-31-2003, 11:31 AM

So, now I've got photos of the first versions of my blocks

Base Plate CPU

Middle Plate CPU

The NB Block

And the GPU Block (it was milled about 2 months ago, so there is a little bit of oxidation on it, sorry for the bad pic)

Unfortunately I was not possible to mill some parts out of plexi, because the acrylic would have been broken....

jaydee · 10-31-2003, 12:16 PM

Cool, glad to see people actually making some stuff around here.....

winewood · 10-31-2003, 03:36 PM

I am really interested in hearing how that middle plate works at directing the flow into the dimples! Do you have any tests lined up for it? I was wondering the same thing .. do you need the tubes? If you cut the holes in the copper the plate becomes a tube afterall...

grassi3000 · 10-31-2003, 03:43 PM

Actually I have got no tubes at all, only the drill holes in the 2nd copper block. The distance between the holes and the cups is 2mm or less, as far as I can remember.
This is one difference to cathar's cascade, where the tubes end in the cups afaik.

my cups have got the same diameter as the holes (49! with 1.2mm diameter).

Well I'm going to test this stuff as soon as I have got the other komponents for my watercooling systems and the final blocks.

Maybe Somebody will test the blocks too.

Cathar · 11-01-2003, 03:16 PM

Quote:

Originally posted by grassi3000
Actually I have got no tubes at all, only the drill holes in the 2nd copper block. The distance between the holes and the cups is 2mm or less, as far as I can remember.
This is one difference to cathar's cascade, where the tubes end in the cups afaik.

my cups have got the same diameter as the holes (49! with 1.2mm diameter).

Looks (in design principle) like one of my early prototypes:

The distances between the holes and the cups was about 2mm.

I had 72 holes in that prototype. It performs okay. Not quite up there with the White Water.

I almost dropped further development on the Cascade design after seeing the results with this block, but decided to persist.

WAJ_UK · 11-06-2003, 11:03 AM

After researching a lot on submerged water jets and looking at a fair bit of experimental data I would recommend that you try to set Z/d=5. Where Z is the jet height and d is the jet diameter. It might be a good starting point as this tends to give the best heat transfer coefficient between the copper and water for a wide range of water velocities
Will

Cathar · 11-06-2003, 02:02 PM

Quote:

Originally posted by WAJ_UK
After researching a lot on submerged water jets and looking at a fair bit of experimental data I would recommend that you try to set Z/d=5. Where Z is the jet height and d is the jet diameter. It might be a good starting point as this tends to give the best heat transfer coefficient between the copper and water for a wide range of water velocities
Will

Anywhere between 4 and 5, but yeah, 5 is a good starting point.

Les · 11-06-2003, 02:56 PM

Quote:

Originally posted by WAJ_UK
After researching a lot on submerged water jets and looking at a fair bit of experimental data I would recommend that you try to set Z/d=5. Where Z is the jet height and d is the jet diameter. It might be a good starting point as this tends to give the best heat transfer coefficient between the copper and water for a wide range of water velocities
Will

Do you have a url with an example of this work or is access to a university library recquired.?
Have,for some time, been enquiring about the papers which show this ( http://forums.procooling.com/vbb/sho...5&pagenumber=3 ).

WAJ_UK · 11-07-2003, 03:41 AM

I found lots of information in the "Advances in Heat Transfer" journels from my uni library

Les · 11-07-2003, 03:52 AM

Quote:

Originally posted by WAJ_UK
I found lots of information in the "Advances in Heat Transfer" journels from my uni library

Ah, the privileged
Long gone are those days
Now have to survive on common fare - the odd grain of wheat amidst endless Google chaff

grassi3000 · 11-07-2003, 04:08 AM

If I remember correctly, my Z/d is about 3,3333... (I can't tell exactly because my plans are on the other computer)

but I'm looking forward to testing my block.

As soon as I've got the final versions in my hands, I'll take some pics again and post them here.

09-09-2003, 04:02 PM	#26
winewood Cooling Savant Join Date: Nov 2002 Location: in my chair Posts: 574	actually.. no. Without a path to direct flow over an area, turbulence will not do anything really. Think baseball. The runners will follow the bases. Same with water, the path of least resistance. If you know the water is being routed over an area, the key is to place the turbulence under that flow. Try this, make your ) a U by lengthening the arms of it. Then place turbulence along the path as it goes back to the outlet. This is the only way I see that working. __________________ -winewood-

10-31-2003, 11:31 AM	#28
grassi3000 Cooling Neophyte Join Date: Jul 2003 Location: Austria Posts: 46	So, now I've got photos of the first versions of my blocks Base Plate CPU Middle Plate CPU The NB Block And the GPU Block (it was milled about 2 months ago, so there is a little bit of oxidation on it, sorry for the bad pic) Unfortunately I was not possible to mill some parts out of plexi, because the acrylic would have been broken.... __________________ P4 2,53 @ 3,02 \| 1 GB Infineon DDR 333 \| Chaintech Apogee 9ejl2 \| Radeon 9500 Pro @ 370 / 330 46xx 3dmarks2k3

10-31-2003, 03:36 PM	#30
winewood Cooling Savant Join Date: Nov 2002 Location: in my chair Posts: 574	I am really interested in hearing how that middle plate works at directing the flow into the dimples! Do you have any tests lined up for it? I was wondering the same thing .. do you need the tubes? If you cut the holes in the copper the plate becomes a tube afterall... __________________ -winewood-

10-31-2003, 03:43 PM	#31
grassi3000 Cooling Neophyte Join Date: Jul 2003 Location: Austria Posts: 46	Actually I have got no tubes at all, only the drill holes in the 2nd copper block. The distance between the holes and the cups is 2mm or less, as far as I can remember. This is one difference to cathar's cascade, where the tubes end in the cups afaik. my cups have got the same diameter as the holes (49! with 1.2mm diameter). Well I'm going to test this stuff as soon as I have got the other komponents for my watercooling systems and the final blocks. Maybe Somebody will test the blocks too. __________________ P4 2,53 @ 3,02 \| 1 GB Infineon DDR 333 \| Chaintech Apogee 9ejl2 \| Radeon 9500 Pro @ 370 / 330 46xx 3dmarks2k3

11-07-2003, 04:08 AM	#38
grassi3000 Cooling Neophyte Join Date: Jul 2003 Location: Austria Posts: 46	If I remember correctly, my Z/d is about 3,3333... (I can't tell exactly because my plans are on the other computer) but I'm looking forward to testing my block. As soon as I've got the final versions in my hands, I'll take some pics again and post them here. __________________ P4 2,53 @ 3,02 \| 1 GB Infineon DDR 333 \| Chaintech Apogee 9ejl2 \| Radeon 9500 Pro @ 370 / 330 46xx 3dmarks2k3

09-10-2003, 01:33 AM	#27
Tens0r Cooling Neophyte Join Date: May 2003 Location: Auckland , NZ Posts: 14	i think any fins outside the core area are a bit unesscessary as all the do is slow down flow and majority of the heat will not even make it to them. not to mention costly machining time on a CNC and programming.

10-31-2003, 12:16 PM	#29
jaydee Put up or Shut Up Join Date: Dec 2001 Location: Spokane WA Posts: 6,506	Cool, glad to see people actually making some stuff around here.....

11-06-2003, 11:03 AM	#33
WAJ_UK Cooling Savant Join Date: Oct 2003 Location: Sussex Posts: 109	After researching a lot on submerged water jets and looking at a fair bit of experimental data I would recommend that you try to set Z/d=5. Where Z is the jet height and d is the jet diameter. It might be a good starting point as this tends to give the best heat transfer coefficient between the copper and water for a wide range of water velocities Will

11-07-2003, 03:41 AM	#36
WAJ_UK Cooling Savant Join Date: Oct 2003 Location: Sussex Posts: 109	I found lots of information in the "Advances in Heat Transfer" journels from my uni library

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