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Old 07-18-2010, 03:44 PM   #16
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Vent directly between trap and drain, or not?


of coarse after 45 years as a plumber i knew it and i knew someone would answer it on the forum



Bad Meteorology:
The water in a sink (or toilet) rotates one way as it drains in the
northern hemisphere and the other way in the southern hemisphere.
Called the Coriolis Effect, it is caused by the rotation of the Earth.

So what do you tell your students.
The direction of rotation in draining sinks and toilets is NOT determined by the rotation of the Earth, but by rotation that was introduced earlier when it was being filled or subsequently being disturbed (say by washing). The rotation of the Earth does influence the direction of rotation of large weather systems and large vortices in the oceans, for these are very long-lived phenomena and so allow the very weak Coriolis force to produce a significant effect, with time.

http://www.ems.psu.edu/~fraser/Bad/BadCoriolis.html

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Old 07-18-2010, 04:34 PM   #17
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Vent directly between trap and drain, or not?


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Originally Posted by HARRY 65 View Post
of coarse after 45 years as a plumber i knew it and i knew someone would answer it on the forum



Bad Meteorology:
The water in a sink (or toilet) rotates one way as it drains in the
northern hemisphere and the other way in the southern hemisphere.
Called the Coriolis Effect, it is caused by the rotation of the Earth.

So what do you tell your students.
The direction of rotation in draining sinks and toilets is NOT determined by the rotation of the Earth, but by rotation that was introduced earlier when it was being filled or subsequently being disturbed (say by washing). The rotation of the Earth does influence the direction of rotation of large weather systems and large vortices in the oceans, for these are very long-lived phenomena and so allow the very weak Coriolis force to produce a significant effect, with time.

http://www.ems.psu.edu/~fraser/Bad/BadCoriolis.html
The article you pointed out falls under the affect of turbulence where yes you can force a draining sink to go the other way. But if you take a sink that was filled and left to settle with the water off and then remove the plug, it will be determined by the coriolis effect. Your attempt at trying to "one up" people by asking a question you thought you knew the answer to failed. You should try another topic when doing that.
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Old 07-18-2010, 04:37 PM   #18
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Vent directly between trap and drain, or not?


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Originally Posted by wvphysics View Post
Your attempt at trying to "one up" people by asking a question you thought you knew the answer to failed. You should try another topic when doing that.
I was thinking the same thing

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