Pump head plays an external centripetal force and balanced with imaginary centrifugal force. Fluid particles circularly forward tangential movement in the direction tangent increases with the fluid particles remaining time increase in the rotating flow passage. And fluid particles circularly forward tangential movement in the direction tangent is caused by the imaginary mechanical force perpendicular to rotational radius. Therefore, mechanical energy supply is proportional to fluid particles remaining time in the rotating flow passage of impeller blade to cause the circularly forward tangential movement.
Interrelation Between Mechanical Energy Supply and Flow Rate in Practical Operation of Centrifugal Pump
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Tanaka, T. "Interrelation Between Mechanical Energy Supply and Flow Rate in Practical Operation of Centrifugal Pump." Proceedings of the ASME 2004 Power Conference. ASME 2004 Power Conference. Baltimore, Maryland, USA. March 30–April 1, 2004. pp. 7-17. ASME. https://doi.org/10.1115/POWER2004-52004
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