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what's the best DDC top? - Page 2

post #11 of 14
Quote:
Originally Posted by somebadlemonade View Post
if it's too smooth it'll create back pressure like effect, at lower volumes, fluids have no problem with over coming that resistance, at higher volumes it actually makes sense to cause turbulence and vorticities where the fluids will come in contact with stationary objects with relation to the flow of the fluid to over come the back pressure
an example of this is a golf ball, a smooth golf ball won't go as far as a normal pitted golf ball. . .

not that say you are wrong that the acrylic version might have a performance edge, just not that it's do to it being smoother, just that irregular pitted surfaces might not provide the turbulence effect i talked about earlier.
I'm sure it depends on the actual tooling path, but I've noticed my MCP-35X top had fairly noticeable stepping motor marks or the feed rate was higher than ideal or both.

In culvert design there is a fairly dramatic improvement from something like corrugated metal pipe which has an n value of .022 vs something like PVC with an n value of .010.

For example a 12" pipe at a 2% pipe slope flowing full.

Capacity = 2.977 cfs CMP or 6.5495 cfs PVC

I don't think the Acetal is quite like a CMP pipe, but it's been shown that small factors in the pump volute and inlet/outlet can make a fairly dramatic difference.

There is of coarse a careful balancing that occurs between inlet and outlet as we've seen in various tops (larger outlets are not necessarily better).

But that volute perimeter if sized appropriately I would think could net some efficiency gains by reducing friction at this critical area..

Just a theory, haven't actually tested.
    
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post #12 of 14
the flow differences are not that great to run after them so im putting a phobya ddc top. its a heavy weight, so atleast it could silence it properly.
post #13 of 14
i was talking about the flow of water over the tooled surface not the flow through the top itself, while it does affect it, if you pitted the inlet and outlet, it might increase flow rates, but it'll have a negative affect at lower flow rates since pressure affect the vorticities size depending on how much pressure and flow you generate, more flow, means tighter vorticities, but i can't do that kind of flow modeling in my head, well not accurately at least, like you said it'd be a balancing act, since you'd have to increase the inlet and outlet bore to allow enough flow to form the vorticities in the first place

i think that'd be really hard to test these theories unless you have access highly calibrated mills/milling machines and measurement equipment
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post #14 of 14
how about the original mcp35x top?
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