Will Water Flow in Syphon System?

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Discussion Overview

The discussion revolves around the mechanics of a siphon system, specifically whether water will flow through a siphon when the outlet pipe is partially filled with water and contains an air pocket. Participants explore the conditions under which water might flow when the diaphragm is pulled upwards, considering factors such as potential energy and pressure dynamics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions whether water will flow in a siphon system with a partially filled outlet pipe and an air pocket when the diaphragm is pulled upwards.
  • Another participant suggests that water will flow if the water in the tank has greater potential than that in the U-tube, assuming sufficient volume and height, and that air pressure can overcome any pressure build-up.
  • A third participant clarifies the scenario by relating it to a toilet bowl system, confirming that the siphon will still start under the described conditions.
  • Another participant explains that air can exert force on the liquid and discusses the impact of buoyant forces, noting that air pockets can disrupt siphon flow.

Areas of Agreement / Disagreement

Participants express differing views on the mechanics of siphon flow with air pockets present. While some suggest conditions under which flow may occur, others highlight potential complications, indicating that the discussion remains unresolved.

Contextual Notes

Assumptions regarding the pressure dynamics and the behavior of air and liquid in the siphon system are not fully explored, leaving some mathematical and physical principles unaddressed.

jackywacky
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Greetings, 1st timer here,

I have a question such as the follow :

If i have a syphon system (similar to that of a toilet cystern) , but the outlet pipe in which it is connected to the U-tube is filled with water, but has a little air pocket, in other words, (filled but not fully filled pipe). If i pull the diaphragm upwards, would the water flow?

Thanks.
 
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I am new to this too. I would guess the as long as the water in the tank portion has greater potential than that of the u-tube it will flow and push the air pocket out as well. The water in the tank should have a high enough volume and be located high enough above the u-tube for it to flow. Also assuming that the air pressure will be enough to overcome any pressure that may build up if the u-tube is sealed in a work producing system. Just guessing from what I know which is not a lot.
 
Bloc911, do you mean that for example, if my toilet bowl cystern is connected to a toilet bowl, but the pipe connecting both the siphon outlet and the toilet bowl is filled with water, if i pull the diaphragm upwards, the siphon will still start?
 
It will. You can think of the air as any fluid. It, like anything else, will exert a force on the next section of liquid proportional to the pressure.

However, when considering air and liquid, there is a significant buoyant force. So, if you did in fact have a "U"-shaped tube, the air pocket "could" rise up both sides and break the "seal" (for lack of a better word). Anyone who has siphoned knows that air pockets can ruin the flow.
 

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