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Water Block Design / Construction Building your own block? Need info on designing one? Heres where to do it |
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#26 | |
Cooling Savant
Join Date: Jan 2002
Location: in a nice cool spot
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billA? ![]()
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feel free to icq/msn me, I'm always willing to toss around ideas. |
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#27 |
Pro/Guru - Uber Mod
Join Date: Sep 2002
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There's been some work on reducing drag on boats and planes with small surface texture features. (Google "Drag Texture Americas Cup")
One speculation I've seen on that subject is that the drag reduction is due to the relative sizes of the texture features and vortices formed. (Haven't looked enough to know if there is anything more definite than speculation.) Did find, that for boats, smoother than 400 grit doesn't seem to affect drag. I agree that at some scale roughness probably doesn't increase turbulence. (at least in a manner beneficial to cooling) What that scale is, is the question. In looking at the info on boat hulls I saw it mentioned repeatedly that surface tension doesn't play any significant role in drag. I'd guess the 'minimum water drop radius' is probably not relevant, but I'm way out of my league with this stuff. |
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#28 | |
CoolingWorks Tech Guy Formerly "Unregistered"
Join Date: Dec 2000
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??? |
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#29 |
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I can have it sandblasted, but my brief research suggests bead blasting would be better. My impression is that bead blasting does more denting than cutting, and I'd guess that's preferable.
I'll look into whether I could get it beadblasted. (As I understand it, same tools, just different media.) |
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#30 |
CoolingWorks Tech Guy Formerly "Unregistered"
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grit blasting will be far more effective than bead blasting due to the greater surface profile angularity
- and believe me, with very coarse grit it will be rough as a cob it must be 'brush blasted' due to copper's softness |
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#31 |
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What I can get done cheaply is with 4020 quartz. (The bag says 20% of the grit doesn't pass through a 40 grit mesh) Checking with McMaster - that seems to be about as coarse as it gets.
I'll see if I can find a scrap of half-hard C110 and send you a sample. If I can't find some C110, I can send you a sample made from some ultra pure, dead-soft copper sheet, but I don't know how representative that would be. (I suppose if the dead-soft stuff isn't eroded too excessively, the half-hard C110 certainly won't be.) Anyway, I'll see what I can come up with. |
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#32 | |
Thermophile
Join Date: Mar 2001
Location: France
Posts: 1,221
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For me, a hydrophilic material (alu & copper both apply) with a rough surface will trap water molecules and keep em due to viscosity / surface tension. Oh and additives such as WW and others modify those parameters indeed... |
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#33 |
CoolingWorks Tech Guy Formerly "Unregistered"
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Since87
let me send you a 462B bp (the same smooth one tested) |
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#34 |
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Bill,
Ok, I'll email my address. I'll have the person doing it, do some practice runs on scrap copper to get a feel for sandblasting copper, before working on the block. Let me know what area you want. (Same circle as the punched block?) If you draw the area on the block with a Sharpie pen, I'll mask around it. |
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