Re: Fluid Mechanics and Dust Collection


"Never Enough Money" <emptyshell@xxxxxxxxx> wrote in message
news:1133297952.469523.49750@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> 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.

i don't think it's a linear extrapolation.

> 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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