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The screw pump is the oldest positive displacement pump. [1] The first records of a water screw, or screw pump, date back to Hellenistic Egypt before the 3rd century BC. [1] [3] The Egyptian screw, used to lift water from the Nile, was composed of tubes wound round a cylinder; as the entire unit rotates, water is lifted within the spiral tube to the higher elevation.
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Portal:Physics/Selected images/13 Johannes Kepler (December 27, 1571 – November 15, 1630) was a German mathematician, astronomer and astrologer. A key figure in the 17th century scientific revolution , he is best known for his eponymous laws of planetary motion , codified by later astronomers, based on his works Astronomia nova , Harmonices ...
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An Archimedes' screw in Huseby south of Växjö Sweden: Archimedes' screw: Roman screw used to dewater mines in Spain: Modern Archimedes' screws which have replaced some of the windmills used to drain the polders at Kinderdijk in the Netherlands: Archimedes' screw as a form of art by Tony Cragg at 's-Hertogenbosch in the Netherlands
Three principal forms exist; In its simplest form (the Archimedes' screw pump or 'water screw'), a single screw rotates in a cylindrical cavity, thereby gravitationally trapping some material on top of a section of the screw as if it was a scoop, and progressively moving the material along the screw's axle until it is discharged at the top.
The volume of water that enters an Archimedes screw turbine depends on the inlet water depth and the screw's rotation speed. To estimates the total flow rate passing through an Archimedes screw turbine for different rotation speeds (ω) and inlet water levels the following equation could be used: