Science physics question


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Old 04-04-21, 07:44 AM
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Question Science physics question

Can someone put into words why?

When I coil up my garden hose when finished using it, there is an amount of water left in the hose. Pressure is removed after turning off the water, nozzle is removed before coiling. As I coil it water is exited from the discharge end. I keep the hose connected to the faucet but the faucet is shut tight (no leaks). The hose is coiled onto a wall hanger maybe about 20 coils 1 to 1 1/2 feet in diameter. I must place a bucket under the open end because within a day any latent water within the hose will be expelled in to the bucket, nearly filling it and leaving the garage floor soaking wet and pooling at the doors. I know it has to do with a syphoning effect but can't quite explain it. How is left over water rounding every loop to exit into the bucket? Is it air pressure/vacuum?

 
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Old 04-04-21, 08:03 AM
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I've always wondered about that to, intuitively, you'd think eventually there would be a vacuum break that would stop the flow.

Either way, to prevent this, I just take the end of the hose and run it up through an opening in the holder (like that trapezoidal thing in yours) and as long as it is even (or so) with the top of the coil, no water comes out. (Nice floor BTW)
 
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Old 04-04-21, 08:48 AM
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Can someone put into words why?
Gravity.

The weight of water (and the lack of a passage from the open end for air to replace the water being drained) keeps a syphon going. Change in air pressure, contraction of hose either from memory, squeezing by other coils or temperature change gets the water started and gravity takes over. In order to prevent vacuum there must be a source of air behind the syphoning water. If there is an anti-syphon device on your faucet that will provide it.
 
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Old 04-05-21, 06:32 AM
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Disconnect the hose from the faucet to verify that the faucet is not letting some water leak through to the hose.
 
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Old 04-05-21, 06:38 AM
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Leave the nozzle on, just release the pressure after you turn the water off. Problem solved !!
 
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Old 04-05-21, 09:15 AM
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Leave the nozzle on, just release the pressure after you turn the water off. Problem solved !!
Or take the nozzle off when done (and hose is extended) then roll up.

Problem solved, especially if you leave the hoses out all winter and dont want them frozen solid for that rare car wash day!
 
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Old 04-05-21, 11:57 AM
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First, there is no problem. Just an observation.

Guy's the faucet does not leak. Absolutely positive on that. I keep the other end always attached for quick ease of use. I always release the pressure at the nozzle end and keep it open. Then I roll up whatever amount used and let the water run out as I roll it up. However the remaining water in the coiled up section always finds it's way to the outlet and dumps in the bucket. I think 2john nailed in in post # 3.
I kind of compared it to a vent pipe that might be clogged and water will drain or syphon from the toilet trap.

Marq, the section of hose shown in the picture is in the section of attached garage that extends beyond the house. And on occasion it will freeze in extreme cold. But the faucet is well within the house proper area and just the hose bib protrudes into the garage wall from the basement. When I first installed that hot and cold spigots I never even thought about winter freezing. That 1st winter I had quite the flood in the garage.

I gave away all my vinyl hoses and bought those ZERO-G hoses. Those are fantastic. Very light and easy to move and use. Maybe a slight reduction on flow.
 
 

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