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03-12-2003, 03:36 PM | #426 | |
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Quote:
I see what you mean now. Your getting more flow/velocity at the base of the block and towards the top of your fins the flow/velocity is slower or almost stagnate. You can see the effect of it in the thermo graph you got from Roscal also. I know why your seeing that. It's just the nature of the impingement. The velocity/flow is faster at the base in a thin layer where the water hits it and is deflected off the surface of the base. Then there is eddies (water swirling up and away from the faster layer), that swirl up and almost back the opposite way slowing the water flow down. How to change that I don't know. Some how you would need to direct the some of the flow/velocity at the top of the fins also. what's happening on a big scale. If the nozzle exit is made big enough, I would think about adding some kind of deflector that sits half way down inside your channels and extends just enough into the center of the nozzle grabbing some of that faster moving water. Use maybe, thin copper sheet? |
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03-12-2003, 03:43 PM | #427 |
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Just remembered your channels are 1mm. What i just said is impossible to do. :shrug:
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03-12-2003, 04:03 PM | #428 |
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I'm glad to see someone understands what I'm babbling about!
I'm not too concerned about the flow sitting at the bottom, because that's where most of the heat appears to be, plus the top is polycarb, so there really wouldn't be much benefit in trying to equalize the flow within a channel. I think that part of the problem is/was this: a) the simulation didn't have a nozzle plug, it had a huge 5/8" opening. With a nozzle, the flow should strike the baseplate, then exit smoothly (more or less). b) the outlet had a swirl going on, which may have had a certain effect: that's been fixed (curved outside wall is now square, and the outlets within the top have been made larger). As for adding deflectors, I wouldn't do that near the jet: I want to leave that one alone so it can "be all that it can be" I'm gonna send this to Roscal, for analysis round 2, but first I have to make sure that the nozzle will allow my pump to work within an effective range. |
03-13-2003, 05:05 PM | #429 | |
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03-16-2003, 07:38 PM | #430 |
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I cant wait until this design become reality and ready for some real testing! It's gonna be interesting!
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03-18-2003, 11:47 AM | #431 |
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A bit of non-progress.
I e-mailed Ken from www.lmnoeng.com about a consult, instead of paying for the nozzle calculation. He offered me a discount on the standalone version: $120 instead of $150. Optionally, I could pay $30 for a one week access to it. Back to googling.:shrug: |
03-25-2003, 01:55 PM | #432 |
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A bit of actual progress:
I ordered a foot long bar of copper, 1/4 by 2". Will be here next week. |
03-25-2003, 02:02 PM | #433 |
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so you're going ahead with the design?
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03-25-2003, 02:17 PM | #434 |
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Yes, the fin pattern is final, so the base is definitely ready for milling.
I'll try out different nozzles, until I get it right |
03-25-2003, 07:38 PM | #435 |
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Good Ben.
I was beginning to worry that you were giving up on such a promising idea/design. Glad to see that you are not. |
03-25-2003, 07:57 PM | #436 |
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I also ordered some extra, so if the milling goes well, I might ask Fixittt to make an extra one for Utabintarbo, heck maybe even Roscal! (and one for Fixittt too, of course!)
Finding a 1mm endmill is much easier, now that the channel depth has been reduced to 4mm. |
03-28-2003, 10:05 AM | #437 | |
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A tiny update:
I found the endmill! www.moldshoptools.com They carry p/n EMS12FtiN, which is described as: Quote:
There's also a ball end endmill available, same specs, but the base price is $11.03. I have been googling for more than a day for this... |
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03-28-2003, 10:09 PM | #438 |
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I got some pics back from WallWart:
Here's the block's o-ring, that just happens to fit perfectly in the PVC fitting. |
03-28-2003, 10:11 PM | #439 |
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...and here's the completed inner res component:
(ref 22067) |
03-31-2003, 02:22 PM | #440 | |
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I found an even cheaper source of endmills:
www.drilltechnology.com I e-mailed them, and got quoted these: Quote:
What do you think guys? |
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03-31-2003, 02:30 PM | #441 |
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Oh... the bit specs:
2 Flute Extended Flute EndMills -Square Cut Code:
MODEL NUMBER CUTTING DIA SHANK DIA FLUTE LENGTH OVERALL LENGTH Code:
EM2XL-0400 0.0400 1/8 0.25 1 1/2" |
03-31-2003, 02:38 PM | #442 | |
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Quote:
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03-31-2003, 02:54 PM | #443 |
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Hum, actually I tossed out the mod to the top that I dreamed up. All I need on the top is the openings for the outlet, but I also need that nozzle, which is a 5/8" plug, 1/2" thick, where the opening is 1/4", but has a cross in the middle of it that's 1.5 mm wide.
That cross is going to have rounded corners, to match the cross in the copper base. By "rounded corners", I mean where the fins intersect, since the channel would be cut using the same endmill. See what I mean? [edit] In polycarbonate, of course, which I would send you. |
03-31-2003, 02:57 PM | #444 |
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Here's the top again:
(oh yeah, screw holes too!) |
03-31-2003, 02:59 PM | #445 |
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...and here's Nicozeg's draft of the rounded corners:
(never mind the extra stuff) |
03-31-2003, 03:48 PM | #446 | |
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I am not so sure I would be any better to do this than Fixitt. He will have the actual block and be able to match things up. It is hard to make a top as perfect as it can get without having what it is going to. Might be worth asking Fixitt to do the top aswell. If for some reason the base needs minor adjusting then he can transfer that right over to the top without much hastle. Either way though I or Fixitt will need a dxf of the top and all the measurments and depths of everything. I will then have to redraw it to work with my mill and also make several different drawings for each step. |
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03-31-2003, 04:09 PM | #447 |
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mkay...
...but I'll still need that nozzle. I still don't have SW2k3 installed, and I already need a mod to it: drop the fin height to 4mm (from 5mm). If I get you the SW2K3 file, can I get you to come up with a DXF that Fixittt can use? (PM me an addy!) I'm also thinking about dropping the baseplate from 1.5mm to 1.0 mm, but I think I'll go with 1.5mm and if Fixittt is not having too hard of a time making this beast, I'll ask him to make another one that's got a 1.0 mm base. Let me know. Copper stock will be here today or tmo! Woot! PS: Those endmills (if "Fixittt approved") are actually 0.0400 in, close "enough" to 1.0 mm (0.0398 in.) . |
03-31-2003, 04:14 PM | #448 | |
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(left: view from top. Right: view from bottom) It is now 1/2" thick (another mod to the SW2K3 file). There will be an inner tube that I will glue to the top of it, and it is 5/8" ID, 3/4" OD. Then, I'll glue the outer tube. The nozzle will simply be dropped in. What I need is the 1/4" nozzle shaped opening in this "nozzle plug", with the crossbars that should finish in a sharp edge, to seperate the water nicely. |
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03-31-2003, 04:15 PM | #449 | |
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I cannot make heads or tails out of that nozzel from that pic. Can you get a drawing of just the nozzel in SW? or even a CAD drawing? Hell anything from a 3D perspective or all the sides drawn out. |
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03-31-2003, 04:39 PM | #450 |
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Kewl!
Here's a *rough* sketch of the nozzle. I don't have any models for it. (nozzle curvature details on next post) |
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