Calculating Water Flow: Time to Fill Canister

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SUMMARY

The discussion focuses on calculating the time required to fill a canister with fresh water, considering various parameters such as canister volume, foot valve size, water depth, and air line diameter. Tests indicate a flow rate of approximately 3.5 liters per second at a depth of 1 meter using 40mm and 50mm foot valves with air pipes of 13mm and 20mm. The impact of air line length and diameter on evacuation time is questioned, along with the effects of using compressed air for pumping water. The goal is to develop a formula that incorporates these variables to predict filling time accurately.

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  • Understanding of fluid dynamics principles
  • Knowledge of pressure calculations at different water depths
  • Familiarity with flow rate measurements
  • Basic experience with pneumatic systems and air displacement
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This discussion is beneficial for engineers, fluid dynamics researchers, and anyone involved in designing systems for water flow management and pneumatic applications.

Red Dog
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I have been trying to work out a formula to calculate how long it might take to fill a container of a known capacity in various depths of fresh water. The container would have a foot valve for entry and a pipe extending above the surface for air displacement. Tests at 1metre deep have given about 3.5 litres per second for a 40mm and 50mm foot valve and an air pipe of 13mm and 20mm.
I have a formula for working out the pressure at a set depth and I am assuming that it should fill more quickly the deeper it is.
Will the length and/or the diameter of the air line affect the time it takes for the air to evacuate?
If I pump the water using compressed air, would the advantage of the extra water over the canister be negated by the extra head to pump?
I would like to input values for canister volume, foot valve size, depth and air line diameter and obtain the time it will take to fill.

Thanks
 
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If the air line had zero diameter or an infinite length, do you think this would have an effect?
 

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