| Parameter | Symbol | Unit | Description | | :--- | :--- | :--- | :--- | | | $\rho$ | kg/m³ | Mass per unit volume of the liquid. | | Viscosity | $\mu$ | cP or Pa.s | Resistance to flow (critical for Reynolds number). | | Tank Diameter | $T$ | m | Inner diameter of the vessel. | | Liquid Level | $H$ | m | Height of the liquid content. | | Impeller Diameter | $D$ | m | Diameter of the agitator blade (usually $D = T/3$ to $T/2$). | | Rotational Speed | $N$ | rpm | Revolutions per minute. | | Number of Impellers | $n$ | - | Single or multiple stages. |
Process success often depends on how fast the tank volume passes through the impeller zone. The volumetric flow rate is calculated using the Flow Number ( Nqcap N sub q
power margin over the fluid power draw for mechanical losses. agitator design calculation xls repack
Determines if the flow is laminar or turbulent. $$ N_Re = \fracD^2 \times N \times \rho\mu $$
Turnover Rate=QVTurnover Rate equals the fraction with numerator cap Q and denominator cap V end-fraction Tip Speed (Shear Indicator) | Parameter | Symbol | Unit | Description
): Standard configurations usually feature an aspect ratio of 2. Essential Mathematical Formulas for Your XLS Sheet
In the world of chemical, petrochemical, and pharmaceutical process design, the agitator is a critical component. It is the heart of any stirred tank reactor (STR), ensuring homogeneous mixing, heat transfer, and mass transfer. For decades, designing these agitators involved tedious hand calculations, complex charts, and engineering judgment. Today, the landscape has changed. The most efficient way to design, troubleshoot, and optimize agitators is through a spreadsheet. The keyword that has captured the interest of many in the engineering community is | | Liquid Level | $H$ | m | Height of the liquid content
Bending Force (Fb)=Hydraulic Force Factor⋅TqD/2Bending Force open paren cap F sub b close paren equals Hydraulic Force Factor center dot the fraction with numerator cap T sub q and denominator cap D / 2 end-fraction Critical Speed Verification
If your search for "repack" refers to Gland Packing :
For multiple impellers, the total process power is the sum of the individual impellers, adjusted for their spacing along the shaft. 4. Mechanical Design and Shaft Integrity
A comprehensive "repack" calculation sheet does not stop at process design; it validates the mechanical integrity of the agitator shaft against bending and torsional stresses. Torque Calculation