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Author Topic: Electricity and hydrodynamics  (Read 2921 times)

exxcomm0n

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Electricity and hydrodynamics
« on: May 15, 2008, 07:45:42 PM »
Hi all,

No, I'm not using them in conjunction. I'm wondering about flow and form comparison.
This was the only forum I thought this might fit in.

I had to clean a basement with 4" (8cm?) of standing water in it recently. It's a large basement without a well graded floor that lends itself to holding pools of water and the only way to clear them to dry besides evaporation is to use brooms or squeegees to push the water over the high points between it and the pit with the sump pump in it.

That was my "critical thinking time" early this week.
Actually it's kind of monotonous and mindless and so the "hind brain"  takes over and leaves you to think about other things.
My thinking about things pretty much revolved around moving volumes of water (and more often and importantly, how to NOT have to move volumes of water again) and I started noticing the water movement.

So I place a broom in a pool of water and watch the circular ripples radiate out from the placement area. Sort of like magnetic field that surrounds wire with "current" moving through it, decreasing in intensity the farther they get from the broom.
Then I push the broom forward and create a "hill" or wave of water from the compression of the water due to the application of motive force and mass of the water in front of its inertia or resistance.
After I reach full extension of the broom handle and can push it no more, the hill/wave travels on in this form but decreasing in height or intensity like the ripples mentioned above. The closest thing I can think of for that ripple is my understanding of an electro-magnetic pulse (EMP).

From a grade school level website explaining electricity I find it's a popular analogy, e.g. :

"The following chart compares water running in a hose and DC electricity flowing in a wire:

Water in a Hose    DC in a Wire      Electrical Units

pressure           potential (V)          Volts
rate of flow            current (I)             Amps
friction              resistance (R)       Ohms

Analogy between a Hose and Electricity in a Wire "

So this is one for DC, and to use it to describe my observations above, the broom size/type is the potential/volts, the pushing of it is the current/amps, and the "hill" is caused by resistance/ohms. That the effects of movement in the water decrease when no longer influenced by direct movement make it closer to the transmission of DC too.

That would lead me to believe the hill/wave of water is like the "kick" that happens when electricity is introduced in wire and is caused by ohms damming flow until the hill/wave breaks the ohm floodgates and continues to do so down the length of the wire until it's push force is weakened enough not not be able to anymore. Of course, this is happening much faster in electricity than it is in water. :D

So, would the corona caused by high current introduced to a wire be due to compression of the natural magnetic fields from the magnetic field of the current in the wire?
In effect "squeezing" them?

So anyway, back to the water.

I'd notice that when I was pushing the water in an enclosed space that it would rebound off the enclosure edges and create a hill/wave 90 degrees to original motion of the water. Would this be why electrical devices strive to "channel" the current and keep away from eddy currents as they create a force 90 degrees to the path of electrons?

Now, myself being in a fanciful mood, I'd like to ask what would happen if you could create hills/waves AHEAD of your motive force to channel it instead of impede it and could form it into a more coherent path.
Obviously it would need to be well timed.

Is this really any different than what happens with a coil?

Well rain is in the forecast again and I'll try to study vortexes and whirlpools next to see what type of form would be needed to get the same sort of action electronically.

Just thoughts, and probably more akin to disinformation, but I've always preferred trying to learn from what I see vs. what I'm supposed to be able to learn from books.

Ciao!