(04-29-2014, 08:30 AM)Pancakes Wrote: Re-read what I've written and yeah. I used incorrect English terms. Since water in this amount, and the forces that work on it, we can relate to it as steady flow of an ideal, non-compressionable, liquid (I hope thats more correct), and while you are right about amplify and hinder, there is the possibility for the water to not rotate at all, if we look on the gravity-coriolis comparison, it would do movement as such you can see in this thing old clocks have which escapes my mind. Harmonic.
???
With old clocks you mean pendulum, a harmonic oscillation? Yeah there is the posiblity that the water doesnt rotate, but how does this have anything to do with what you claimed you were demonstrating?
(04-29-2014, 08:30 AM)Pancakes Wrote: I don't mean to disprove here the fact there is rotation, just the fact that it is caused by Coriolis acceleration, rather than geometrical reasons. And the misbelief that it has a predetermined cycling side.
The numbers I've show are very relevant, since they show how insignificant Coriolis acceleration is in the system. Even a nearly perfect plumber would do the job with a deviation degree of ~5 degrees. That just shows how insignificant Coriolis acceleration is, when you have gravity that plays in.
EDIT: Not to mention the fact that if you look at local geometry, a simple local field tolerance that at a sink would be like, what? +-0.5 mm? That alone would yield a local deviation that is creating a force far bigger than Coriolis. What I've shown is just Geometry vs spinning systems derived forces
I think the "misbelief" that you are refering to is that when a sink drains water, a slight clockwise or counterclock wise rotation will be induced depending if you're north or south, because of the coriolis force. Thats not a misbelief. That actually happens. The rotation induced is just so small that:
a) you would never even notice it in your regular sink
b) it will be super-imposed by other rotations that were happening in the sink which will likely be much larger, for example through stirring or the water entering the sink in a certain angle at the edge of it, which makes the water rotate much faster than anything the coriolis acceleration would do.
c) a special shape of the sink (for example a spiral shape) would cause the water to rotate faster in either direction while draining out.
However, what you you have calculated has absolutely no relevance to that what so ever.
First of all, the slant angle of the bottom of the sink, as long as the bottom is flat and not in some special space like a spiral, will not affect any rotational movement, except maybe in the special case that the water in the sink is very very shallow so that it just runs off the floor and goes into one side of hte sink. If the water is not shallow and not running off on the floor of the sink, there actually IS no acceleration happening because of the slanted floor. Take a glass of water. Tilt it slightly. Is the water in the glass being continously accelerated while its tilted? Nope. If the water is not shallow, water above a certain distance from the floor of the sink will not be affected by what the floor looks like, except through turbulent exchange of momentum maybe, so your calculation is actually irrelevant to almost the entirety of the content of the sink. In any case, your calculation is not representative enough to say that the coriolis-induced rotation wont happen, without more information on the shape and size of the sink.
Bottom line is.... the only thing you proved is that the coriolis acceleration roughly corresponds to the acceleration of water running off a surface at a certain angle. However, this does NOT mean that coriolis-force induced rotation doesnt happen unless the bottom of the sink is flatter than that angle.
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