The dimensionless Power Number depends on the impeller type (e.g., turbine, propeller, anchor) and the presence of tank baffles. Npcap N sub p is typically constant for a given geometry. Viscous Fluids: An actual Npcap N sub p is calculated by applying a viscosity power factor ( fμf sub mu ) based on the NRecap N sub cap R e end-sub 3. Calculate Power Requirements The basic power requirement ( ) is derived from the power number and fluid properties.
A practical section covers scale-up rules and empirical corrections: maintaining constant tip speed vs. constant power per unit volume, and when each approach makes sense. The spreadsheet includes a compact table of common impellers with recommended Np, typical clearance ranges, and agitation intensity guidance — handy when you want to sanity-check a selection.
The dimensionless Power Number depends on the impeller type (e.g., turbine, propeller, anchor) and the presence of tank baffles. Npcap N sub p is typically constant for a given geometry. Viscous Fluids: An actual Npcap N sub p is calculated by applying a viscosity power factor ( fμf sub mu ) based on the NRecap N sub cap R e end-sub 3. Calculate Power Requirements The basic power requirement ( ) is derived from the power number and fluid properties.
A practical section covers scale-up rules and empirical corrections: maintaining constant tip speed vs. constant power per unit volume, and when each approach makes sense. The spreadsheet includes a compact table of common impellers with recommended Np, typical clearance ranges, and agitation intensity guidance — handy when you want to sanity-check a selection. agitator design calculation xls repack