without mechanical failure. By using a structured calculation sheet, engineers move from guesswork to a precise science that ensures the product—whether it’s paint, medicine, or food—is mixed perfectly every time. for a particular mixing task, such as solid suspension liquid-liquid blending
Flat, dished, or conical (affects the clearing distance of the impeller). 2. Impeller Selection and Geometry
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The Reynolds number (Re) for mixing is calculated to determine the flow regime. agitator design calculation xls
The following data must be entered into the spreadsheet interface (typically Sheet 1: 'Inputs').
Add a 15% to 20% safety margin for fluid fluctuations. 3. Structural and Mechanical Validation
This flow rate ($Q$) is then often normalized by the vessel’s cross-sectional area to determine the , which is a direct indicator of mixing intensity and suspension capability. A well-designed spreadsheet will compute these values and, based on industry correlation, may even recommend the number of agitators required for tall vessels. without mechanical failure
What is the primary (e.g., solid suspension, gas dispersion, simple blending)?
Create a standardized company template for agitator sizing.
): Calculate the revolutions per second based on the desired tip speed or process turnover rate. 3. Power Consumption Calculations The Reynolds number (Re) for mixing is calculated
Always include a safety factor of 1.2 to 1.5 in your agitator design calculation xls to account for higher viscosity during startup.
The power number is a dimensionless quantity that depends on the impeller type and NRecap N sub cap R e end-sub . The spreadsheet should feature a lookup table for Npcap N sub p based on the selected impeller. C. Power Calculation (P) The power required (in Watts) is calculated as: