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Thread: [b]Drainwater rotation Northern vs Southern hemisphere[/b] |
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Thread Status: Active Total posts in this thread: 19
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
We had a girl convinced that a toilet could not be constructed at the equator as it would not flush and that cruise ships apporaching the equator make announcements that toilets are not to be used until after it has been crossed. If that were so, indonesia would be the country hosting the world toilet forum, instead of china, because of it's alleged major flushing problems. And water here in Singapore would swirl very slowly indeed. |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Hi
I having tried this myself I can say that the water corrected the counter spin I put on it repeatedly. Suggesting that there is no force at work seems ludicrous to me. You may want to check the difference between Typhoons and Hurricanes.  Robert |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
There is a force on it, it's just not one produced by the rotation of the Earth. The Corilois force is 2mOv where O is angular velocity of the rotating body,l m the mass of the object experiencing the force and v the velocity of the object. Direction will be perpendicular to the direction of motion (2m[O x v] in vector notation).
The Earth completes one rotation a day, which is about 24 hours. Therefore the angular velocity is about 7x10^-5 rad/s. This means the Corilois force is about 5 orders of magnitude less than the force exerted by gravity. It therefore cannot be the cause of the spin, it's just too small. |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Dave,
Thanks for the link, it gives the clear answers I needed, and were I went wrong on my field research.  Graham, I assume ridle #75 is considered to be a myth, clearly busted by the link of David, and will be withdrawned from the ridle of the day contest? Thanks guys, we still the best supported team arround....  |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
What the website mentions, but does not emphasize, is that a rotation can be imposed on the draining water by the shape of the receptacle. Even a slightly imperfectly circular drain will introduce an effect. So there are lots of possibilities for imposing a preferred direction of rotation.
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Lawrence,
It was very clear that the shape of the bowl influenced the rotation... my field reseach was done in normal standard oval shaped bowls. The explaination of a correct scientific reseach set up was very interesting. Going to crunch a few more so we visit Norway on wednesday.. |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
Hi I having tried this myself I can say that the water corrected the counter spin I put on it repeatedly. Suggesting that there is no force at work seems ludicrous to me. You may want to check the difference between Typhoons and Hurricanes. Robert Dave, Everything I read indicates that the Coriolis force is only applicable to very large systems such as the weather. No questions asked....  ... but..I did "some" field research I filled two sinks in the office with water, watched the first one draining anti clockwise, I stirred the second one clockwise and pulled the plug... at the end it rotated anti clockwise.... I discussed it also with some of my collegues, most of them have a uneversty degrees, and they told me it is not proven but ... still if it isn't the Coriolis force what is? BTW housekeeping is not amused with my "field research" I did the same and I found that if the water was started either direction, it would return to the same Direction of spin. (after a counter spin.) I was trying to Prove that it is not a Myth. What my too simple Experiment only seems to prove is that the direction that the water starts spinning inside the drain pipe will continue even if the water above it is redirected to a counter spin. It seems to me that Gravity is the Force that drives the centrifugal inertia, that feeds the Vortex in a Drain Pipe its energy. The Coriolis force is too week to change the direction of an artificially stimulated direction in a drain pipe. That is why it returns to the same direction. And at the equator, the force is absent. The example of the man at the equator only shows that the force there is nonexistent. (At the equator. As could be expected.) Simply turning the bowl either direction in the absinthes of the force worked to "start the direction of the vortex." Still none of these convinced me completely either way! I even had a Drywall Contractor inform me that the "other" direction Toilet is made for the Southern Hemisphere....LOL  Bob  |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
What the website mentions, but does not emphasize, is that a rotation can be imposed on the draining water by the shape of the receptacle. Even a slightly imperfectly circular drain will introduce an effect. So there are lots of possibilities for imposing a preferred direction of rotation. I protest the direction of this arguement. Any good drunk knows the toliet bowl water spins in direct proportion to and in harmony with how far your head is in the basin. I can attest to this as I have amassed several years of direct evidence.  [Edit 1 times, last edit by Former Member at Feb 6, 2005 3:55:06 AM] |
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
What the website mentions, but does not emphasize, is that a rotation can be imposed on the draining water by the shape of the receptacle. Even a slightly imperfectly circular drain will introduce an effect. So there are lots of possibilities for imposing a preferred direction of rotation. I protest the direction of this arguement. Any good drunk knows the toliet bowl water spins in direct proportion to and in harmony with how far your head is in the basin. I can attest to this as I have amassed several years of direct evidence. Leave it to Hairy4PawsLOL [Edit 1 times, last edit by Former Member at Feb 13, 2005 2:25:24 AM] |
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