1. What is Work Done Per Second Per Unit Weight?

Work Done by Centrifugal Pump per Second per Unit Weight of the liquid is the amount of unit work done by the pump. It represents the energy transferred to the fluid per unit weight per second.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( W_{cp} \) — Work done per second per unit weight (J)
• \( V_{w2} \) — Velocity of whirl at outlet (m/s)
• \( u_2 \) — Tangential velocity of impeller at outlet (m/s)
• \( V_{w1} \) — Velocity of whirl at inlet (m/s)
• \( u_1 \) — Tangential velocity of impeller at inlet (m/s)
• \( g \) — Gravitational acceleration (9.80665 m/s²)

Explanation: This formula calculates the work done by accounting for the difference in angular momentum between the inlet and outlet of the centrifugal pump.

3. Importance of This Calculation

Details: Accurate calculation of work done per unit weight is crucial for pump efficiency analysis, energy consumption estimation, and proper pump selection for specific applications.

4. Using the Calculator

Tips: Enter all velocity values in m/s. Ensure all values are positive and measured accurately for precise results.

5. Frequently Asked Questions (FAQ)

Q1: What is Velocity of Whirl?
A: Velocity of whirl is the tangential component of absolute velocity at the blade section.

Q2: Why is this calculation important for non-radial flow at inlet?
A: For non-radial flow at inlet, the whirl component exists, making this calculation essential for accurate work done estimation.

Q3: What are typical values for these velocities?
A: Values vary based on pump design, but typically range from 5-30 m/s for centrifugal pumps.

Q4: How does this relate to pump efficiency?
A: The work done calculation helps determine the actual energy transfer, which is compared to the input power to calculate efficiency.

Q5: Can this formula be used for all types of pumps?
A: This specific formula is designed for centrifugal pumps where flow at inlet is not radial.