Agitator Design Calculation Xls

The flow in a mixing tank can be laminar, transitional, or turbulent. The agitator Reynolds number is defined as:

=1150*2*(0.7^2)/1.0 → Re = 1,127 (Transitional – caution needed).

To design an agitator and create a functional calculation spreadsheet (XLS), you must account for fluid properties, tank dimensions, and impeller characteristics. 1. Key Design Formulas agitator design calculation xls

Even a perfect formula is useless without validation. Cross-check your XLS results using three methods:

| Parameter | Symbol | Units | Typical Range | |-----------|--------|-------|----------------| | Tank Diameter | T | m | 1.0 – 5.0 | | Liquid Height | H | m | H/T = 0.8 – 1.2 | | Impeller Diameter | D | m | D/T = 0.3 – 0.6 | | Baffles (Yes/No) | – | Boolean | Yes for turbulent | | Speed | N | RPM | 10 – 500 | | Density | ρ | kg/m³ | 800 – 1500 | | Viscosity | μ | cP | 1 – 100,000 | The flow in a mixing tank can be

Not all power is used equally. The pumping number defines the bulk fluid velocity:

The is a dimensionless constant unique to each impeller geometry. For example: The pumping number defines the bulk fluid velocity:

For blending and solid suspension, high Nq is desirable. For dispersion (gas-liquid), low Nq with high Po is typical.