Re: Fluid Mechanics and Dust Collection

Engineering estimate: Let's assume the wire is coiled in such a way as
to represent a cross-sectional area (when looking through the tube like
a telescope) of 1 square inch. That seems hign but let's go with it.

Now a 4 inch diameter tube has a cross sectional area of 12.5 square
inches. Thus, I claim approximately 8% of the are is lost so there's an
8% loss of vacuum every foot.

My 1 inch is probably high, it's probably closed to one tenth of an
inch so the result is closer to 0.8 percent.

I know nothing about fluid mechanics except that my roommate used to
spend entire nights doing the homework (I was in electrical
engineering, he in mechanical). However, I'll bet that my super simple
minded approach here is not that far off.

Dave, sorry for taking your humorous answer so seriously.

Dave Hinz wrote:
> On 29 Nov 2005 08:05:13 -0800, Never Enough Money <emptyshell@xxxxxxxxx> wrote:
> > For relative comparisions when temp, humidity,etc are held constant but
> > the angle of the "Y" is varied, there's got to be a rule of thumb --
> > say vacuum loss is proportional to the sine of the angle to the cube
> > power....or something....
>
> But how does the grounding wire change the flow? Clockwise, or
> counterclockwise twist to the strands?

.

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