Torques in a Pump: Understand Opposite Signs

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SUMMARY

In a pump operating under steady state conditions, the pump torque is positive while the fluid torque is of equal magnitude but opposite in direction, resulting in a net torque of zero. This phenomenon is explained in detail in Dr. Loganathan's book, "Water Hammer: An Analysis of Plumbing Systems, Intrusion, and Pump Operation." The key distinction lies in the nature of torque as a force that induces rotational motion; thus, the opposing directions of the forces exerted by the pump and the fluid lead to the opposite signs of their respective torques.

PREREQUISITES
  • Understanding of torque dynamics in fluid mechanics
  • Familiarity with steady state conditions in pump operations
  • Knowledge of the principles of force and motion
  • Basic concepts from "Water Hammer: An Analysis of Plumbing Systems, Intrusion, and Pump Operation" by Dr. Loganathan
NEXT STEPS
  • Research the principles of torque in fluid mechanics
  • Study the effects of steady state conditions on pump performance
  • Explore the relationship between force and rotational motion in mechanical systems
  • Read "Water Hammer: An Analysis of Plumbing Systems, Intrusion, and Pump Operation" for in-depth understanding
USEFUL FOR

Engineers, fluid mechanics students, and professionals involved in pump design and operation will benefit from this discussion, particularly those seeking to understand the dynamics of torque in pumping systems.

Mikealvarado100
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Hi
In a pump (which operates in normal condition: steady state), pump torque is positive and fluid torque is of equal magnitude and of opposite direction so that the sum of both is zero. ''P. 66 of 'Water Hammer: An Analysis of Plumbing Systems, Intrusion, and Pump Operation' by: Dr. Loganathan and ...
I need so explanation about opposite sign of pump torque and fluid torque? Both rotate in a same direction, then why one of positive and the other is negative?
 
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Remember that torque isn't itself a rotation, it is a force. Specifically a force that tends to cause rotational motion. See here: https://en.wikipedia.org/wiki/Torque

The force from the water on the pump is equal to the force from the pump on the water, but in the opposite direction. Because it is in the opposite direction, the direction of torque is also opposite, hence the negative sign.
 

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