A hose pipe is wrapped helically around a rod or bamboo pole, one end is placed in the water in a pond and the other end is at a higher level in a tank or the rain hole around a tree. The pipe (and the hose wrapped around it) is rotated and the water goes up from the pond to the rain hole. This Screw Pump was designed by Archimedes, the scientist who was behind Archimedes Principle too (if an object of 1300 g is sunk in water, its weight becomes 800 g. The loss of 500 g is the weight of water displaced by the sunk object. Since the density of water is 1 g / cc, we derive that the volume of water displaced is 500 cc. Archimedes principle is not, emphatically NOT, that the volume of water displaced by a sunken object is equal to the volume of the object.).
The question is how the Archimedes Screw Pump (ASP) should be installed.
- The axis of the ASP should always be at an angle; surely not vertically up at 90 degrees. What is the angle? 30 degree? 45 degree?
- Can the pond end (source) of the ASP be fully submerged in water? I feel that it cannot be fully submerged in water even if the slope is 15 degree (below the angle determined for Q1).
Scientific American has a (Makerspace?!) project Lift Water with an Archimedes Screw - A gravity-defying science project from Science Buddies
Wish you can Make an Archimedeses Screw Pump and answer my questions. Why I face these problems? I want to install a solar water pump to raise water from a 10 m deep open well to a roof top water tank at 20 m height. Wish to use 100 W or 200 W DC pump. Non positive displacement pumps, like the most popular Centrifugal pump, are 0.5 kW AC powered. But I found a Submersible 200 W DC Screw pump. But I am afraid that it will not be able to pump water 30 m up as the source end is submerged in water, even if submerged at an angle.