Before we discuss the PDF, let's understand the stakes. Agitator design involves two parallel engineering tracks:
| Step | Action | Key Details | |---|---|---| | 1. Gather input data | Define vessel geometry, fluid properties, and operating conditions. | Include density, viscosity, temperature, baffle count, impeller speed, and shaft material stresses. | | 2. Perform power and agitation calculations | Compute power number, Reynolds number, and pumping capacity. | Determine flow regime using Re, and select impeller type and D/T ratio accordingly. | | 3. Calculate mechanical loads | Determine torque, bending moment, and forces on the impeller. | Torque is calculated as: | | 4. Design the shaft | Compute shaft diameter based on torque and bending. | Consider critical speed to avoid resonance failures. | | 5. Perform mixing intensity analysis | Calculate bulk fluid velocity and degree of agitation. | A degree of agitation between 3–5 is typical for slurry mixing in tanks. |
: Standard choices include propellers for low viscosity, turbines for high shear, or anchor agitators for high-viscosity wall-scraping. Memorial University of Newfoundland 2. Calculate Reynolds Number ( cap N sub cap R e end-sub