(Power Number) is a dimensionless value specific to each impeller design. Motor Selection
To determine the flow regime (laminar, transitional, or turbulent), the Reynolds number ( cap N sub r e end-sub
Me=(Mt)2+(Mb)2cap M sub e equals the square root of open paren cap M sub t close paren squared plus open paren cap M sub b close paren squared end-root Minimum Shaft Diameter (
High-efficiency hydrofoils (low shear, high flow), pitched blade turbines (axial/radial flow), or straight-blade Rushton turbines (high shear).
An "agitator in mixing" Excel file is a specialized spreadsheet engineers use to design and calculate agitator parameters for mixing tanks. These digital tools act as a bridge between complex fluid dynamics theory and practical engineering application. They are used by engineers worldwide to design, troubleshoot, or optimize stirred tanks and reactors across various industries, including chemical, pharmaceutical, food, and mining. The input provided typically includes vessel dimensions and fluid properties, while the output provides crucial design parameters such as required motor power, impeller diameter, and shaft dimensions. agitator design calculation xls repack
| If you are... | Action | |---------------|--------| | | Use free, verified spreadsheets from Cheresources or EngineeringToolbox. No repack needed. | | Working engineer | Use vendor software (LIGHTNIN, Chemineer, Mixtec) or licensed tools like Aspen Plus (mixer model) or Fingrid . Cost is minor vs. failure. | | Hobbyist / small plant | Write your own simple XLS following McCabe’s Chapter 9 (3 hours of work). Safer than any repack. |
If your process injects gas (like fermentation), the effective power draw drops. The spreadsheet should include a gassing factor (
[Inputs: Geometry, Fluid, Impeller] │ ▼ [XLS Automated Calculation Engine] ───► [Instant Reynolds & Power Checks] │ ▼ [Outputs: Motor KW, Shaft Dia, Critical Speed]
To build or verify an , you must integrate specific fluid mechanics equations. The standard flow for these calculations moves from fluid properties to power requirements, and finally to mechanical design. Reynolds Number ( NRecap N sub cap R e end-sub (Power Number) is a dimensionless value specific to
Do you require equations for (like critical speed) or just the process power sizing ? Share public link
Achieving the required mass transfer, heat transfer, solid suspension, or liquid-liquid emulsification.
Sizing the shaft, gearbox, and motor to withstand torsional and bending stresses without hitting critical resonant frequencies. 2. Input Parameters Needed for the XLS Tool
The XLS repack tool provides calculations for: These digital tools act as a bridge between
): Critical for determining power draw and mass-based pumping rates. Dynamic Viscosity (
What are the ? (specifically viscosity and density) Are you working with a specific impeller type ?
A professional engineering spreadsheet should be modular, color-coded, and locked against accidental formula deletion. Key Inputs / Outputs Version tracking and user instructions Revision log, scope notes, disclaimer 2. Process Inputs Defining the chemical environment Fluid density, viscosity, tank size ( 3. Impeller DB Reference library for Npcap N sub p Nqcap N sub q Hydrofoil, Rushton, Anchor performance factors 4. Power Calc Fluid dynamic sizing engine Motor HP calculation, Tip Speed, Turnover rate 5. Shaft Design Mechanical integrity validation Critical speed ( Nccap N sub c ), Bending stresses, Shaft diameter 6. Data Sheet Summary for procurement and vendors Formatted specification sheet ready for export Best Practices for Spreadsheet Use