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Hydraulic Capacity and Efficiency of a Low-Speed Nonpressurized Coil Pump

Department of Hydraulic and Sanitary Engineering, Poznan University of Life Sciences, Piątkowska 94A, 60-649 Poznań, Poland
Author to whom correspondence should be addressed.
Water 2019, 11(8), 1659;
Received: 4 July 2019 / Revised: 2 August 2019 / Accepted: 8 August 2019 / Published: 10 August 2019
(This article belongs to the Special Issue Smart Hydraulics in Wastewater Transport)
PDF [4681 KB, uploaded 13 August 2019]


The paper presents the results of an investigation on hydraulics of a low-speed coil pump for transport of liquids. One of the pump’s advantages is its wide range of potential inclination angles for its rotating shaft, from the horizontal to an almost vertical position. A simplified hydraulic model was developed based on kinematic and geometrical considerations to determine the pump capacity. The model was verified under laboratory conditions using a low-speed coil pump composed of transparent PVC tube (15 mm outer diameter) wound around a cylindrical drum (104 mm external diameter; 550 mm long). Laboratory tests were performed for three angles of inclination of the axis of rotation (20°, 40°, and 60°) and four rotational speeds (10, 20, 30, and 40 rpm). The results of the tests showed satisfactory agreement with the hydraulic model predictions. Energetic efficiency was estimated on the base of electric power measurements and difference of water levels in the two arms of rotating transparent torus, partly filled with water. The hydraulic efficiency of the coil pump is increasing with decreasing rotational speed. View Full-Text
Keywords: Archimedean screw; hydraulic capacity; coil pump efficiency; pressure drop in helical coil Archimedean screw; hydraulic capacity; coil pump efficiency; pressure drop in helical coil

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Matz, R.; Błażejewski, R.; Nawrot, T.; Pawlak, M. Hydraulic Capacity and Efficiency of a Low-Speed Nonpressurized Coil Pump. Water 2019, 11, 1659.

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