Home
Back
Impeller Power Equation:
| From: | To: |
The impeller power calculation determines the power required to drive an impeller based on fluid density, rotational speed, impeller diameter, and system efficiency. This is essential for proper pump and mixer design in various industrial applications.
The calculator uses the impeller power equation:
Where:
Explanation: The equation shows that power is proportional to the cube of speed and the fifth power of diameter, making these the most influential parameters in impeller design.
Details: Accurate power calculation is crucial for selecting appropriate motors, ensuring energy efficiency, preventing equipment overload, and optimizing mixing performance in chemical, pharmaceutical, and water treatment industries.
Tips: Enter fluid density in kg/m³, rotational speed in revolutions per second, impeller diameter in meters, and efficiency as a percentage. All values must be positive numbers.
Q1: Why is power proportional to N³ and D⁵?
A: Power increases with the cube of speed because both torque and speed contribute. The fifth power of diameter reflects the combined effects of increased swept area and peripheral velocity.
Q2: What is typical efficiency range for impellers?
A: Efficiency typically ranges from 40% to 85%, depending on impeller type, fluid properties, and system design.
Q3: How does fluid viscosity affect power requirements?
A: Higher viscosity fluids require more power due to increased resistance to flow and higher shear stresses.
Q4: What are common impeller types?
A: Common types include axial flow (propeller), radial flow (turbine), and mixed flow impellers, each with different power characteristics.
Q5: When should safety factors be applied?
A: Apply safety factors (typically 10-20%) for motor selection to account for startup torque, fluid property variations, and potential fouling.