Physics Help Forum How to calculate the conditions for water suction using pressure difference.

 Thermodynamics and Fluid Mechanics Thermodynamics and Fluid Mechanics Physics Help Forum

 Jun 17th 2017, 04:53 PM #1 Junior Member   Join Date: Jun 2017 Posts: 2 How to calculate the conditions for water suction using pressure difference. I want to make a container with a low pressure inside it to pull water from a reservoir upward using a pipe, How do I decide on the height, the required pressure difference and the relevant flow rate?
 Jun 18th 2017, 12:41 AM #2 Senior Member   Join Date: Apr 2017 Posts: 131 So ...you have a sealed container connected to a reservoir. The reservoir is at a lower height . A pipe exits the bottom of the container and connects to the reservoir . An air pipe exits the top of the container , you want to pump out the air and suck water into the container ... One atmosphere of air pressure is equivalent to 10 meters of water height , if the reservoir is more than 10 meters below the container ,you can't do it ... up to 10 meters lower you could , with a good vacuum pump. Rate of flow is dependent on pipe diameter and length. A hydraulic ramp pump might be a better idea .Powered by the pressure in the reservoir it can raise some water to a greater height , at the cost of transferring a greater quantity to lower than the reservoir height. kavinmathi likes this.

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