) at the impeller to ensure it doesn't strike the tank walls or baffles. 5. Summary & Results Table Create a final "Output" sheet that summarizes: Actual Shaft RPM Torque (N-m) Shaft Diameter (mm) Critical Speed Ratio Power number calculation - ResearchGate
P=Kp⋅μ⋅N2⋅D3cap P equals cap K sub p center dot mu center dot cap N squared center dot cap D cubed (where Kpcap K sub p is the laminar power constant) Step 3: Determine Motor Power ( Pmcap P sub m The calculated power (
Vt=π⋅D⋅Ncap V sub t equals pi center dot cap D center dot cap N Gentle agitation: Medium agitation: Intense agitation: Step 4: Calculate Power Consumption (
Comprehensive Guide to Agitator Design Calculations (with Excel Spreadsheet Integration) agitator design calculation xls
): This is a dimensionless constant specific to your impeller type, often found in lookup tables or generic curves. Calculate the actual shaft power.
The flow regime is generally interpreted based on the following $Re$ values:
Standard industrial agitator design relies on specific geometric proportions relative to the tank diameter ( ) at the impeller to ensure it doesn't
cap N sub cap R e end-sub equals the fraction with numerator cap D squared center dot cap N center dot rho and denominator mu end-fraction = Impeller diameter ( = Rotational speed ( = Density ( = Viscosity ( cdn.prod.website-files.com 3. Determine Power Consumption
Agitator design involves calculating process requirements (like power and mixing intensity) and mechanical integrity (like shaft diameter and critical speed).
He entered the tank dimensions. The spreadsheet asked for the ratio of the impeller diameter to the tank diameter (D/T). Calculate the actual shaft power
is known, calculate the motor power required to turn the impeller through the fluid:
The required motor power is the calculated shaft power divided by the drive efficiency (gearbox + seals).
): Rotational speed in revolutions per minute (RPM) or revolutions per second (RPS). Power Number ( Npcap N sub p
Designing an agitator requires careful consideration of various factors, including tank dimensions, fluid properties, and mixing requirements. Using Microsoft Excel (XLS) can simplify the calculation process, allowing for quick and accurate determination of agitator design parameters. By creating a template XLS file, engineers can easily perform calculations and optimize agitator design for various applications.
=IF(Re_Cell > 10000, "Turbulent", IF(Re_Cell < 10, "Laminar", "Transitional"))