Agitator Design Calculation Xls -
An agitator cannot just mix; it must survive the mechanical forces generated by fluid resistance. Your XLS sheet should evaluate shaft stress to prevent catastrophic failures. Torque Calculation (
): Rotational speed, typically converted to revolutions per second ( 2. Geometric Configuration and Dimensioning
$$ Q = N_q N D^3 $$
Injecting gas into a liquid lowers the effective density of the fluid. A turbine rotating in a gassed liquid draws up to 50% less power than in a pure liquid. If the gas feed stops unexpectedly, the power draw spikes back to full ungassed levels instantly. Design your motor for the ungassed state to prevent motor tripping.
+-------------------------------------------------------+ | AGITATOR DESIGN CALCULATOR | +-------------------------------------------------------+ | [Input Block] | | - Vessel Dimensions, Fluid Density, Viscosity | +-------------------------------------------------------+ | [Impeller Selection] | | - Type (Hydrofoil, Anchor, Turbine), Diameter | +-------------------------------------------------------+ | [Process Calculations] | | - Reynolds Number, Power Number, Absorbed Motor Power| +-------------------------------------------------------+ | [Mechanical Sizing] | | - Shaft Diameter, Bending Moment, Critical Speed | +-------------------------------------------------------+ Step 1: Vessel and Fluid Inputs Create data entry cells for the tank internal diameter ( ), liquid height ( ), fluid density, and viscosity. Step 2: Impeller Geometry Selection agitator design calculation xls
From this, the spreadsheet can calculate the bulk fluid velocity (Q / tank cross-sectional area) to quantify mixing intensity. The Degree of Agitation is often rated on a scale where a bulk velocity of 6 ft/min corresponds to a value of 1.
) determines whether the fluid flow inside the tank is laminar, transitional, or turbulent. The formula for an agitated vessel modifies the standard pipe flow equation to account for impeller diameter and rotational speed. An agitator cannot just mix; it must survive
Use VLOOKUP or INDEX/MATCH formulas to automatically pull the correct Npcap N sub p
Tip speed dictates the shear rate at the outer edge of the blade. This is a critical metric for shear-sensitive products. Geometric Configuration and Dimensioning $$ Q = N_q
For a standard "square batch" (where liquid height equals tank diameter), the impeller diameter is typically of the tank diameter (
The Reynolds number classifies the fluid flow profile inside the mixing vessel.