# power number values for impellers

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### What is the formula to calculate the P/V power number of

Ali Julfiker Masud. The ungassed power number Np of a single impeller is 5.2 and for the two impeller system the power number can be assumed to be twice that value. Power consumption of

### Mixing: Impeller Performance in Stirred Tanks

This graph plots the hydraulic efficiency HYDR versus the power number for various impellers TABLE 1. TYPICAL VALUES OF P o Fl AND x FOR COMMON IMPELLERS Impeller Power number Flow number x D / l0 Narrowblade hydrofoil 0.30 0.52 17 Wideblade hydrofoil 0.70 0.66 Pitchedblade turbine 1.50 0.80 16 Flatblade turbine 3.00 0.80

### Mechanical Agitator Power Requirements for Liquid Batches

All power numbers reported within this course will deal with correlation results in the turbulent flow regime and be reported as a constant. Power number constants are listed in Table 2 for the various impeller types shown in Figure 3. Figure 5 and Table 1 are references for the various shape parameters that impact the power number.

### Power Number an overview ScienceDirect Topics

Power and Power Number. The power number is a function of Reynolds number and is constant for Reynolds number greater than 10000. From the power number calculate shaft power with: 163 P NPN3D5 gc. Where: P shaft power W or ftlb f /s divide by 550 for hp g c conversion factor 1 m/s 2 or 32.17 ft/s 2.

### Dimensionless Numbers University of Michigan

Another dimensionless quantity commonly used to characterize impellers is the power number NP. It has been shown through experimental data that the power consumption of an impeller P is proportional to the cube of the rotational speed of the impeller the fifth power of the impeller diameter and the density of the fluid.

### Mixing Impeller Power ProQuip Mixers

The value of the dimensionless power number Np depends on several factors including impeller design number of impellers and lo ion within a tank tank baffling and fluid viscosity. Typically the power number is shown for mixing in fully turbulent flow.

### Impellers Selection Guide: Types Features Appli ions

Power Number. Power number is a value specific to mixing impellers which describes the impeller 39s power consumption. The formula for calculating an impeller 39s power number is . where: N P power number. P impeller power in watts. density of tank liquid in kg/m 3. n shaft speed in revolutions/second. D a impeller diameter in meters

### CHAPTER 9. AGITATION AND MIXING

POWER CONSUMPTION OF AGITATORS gt Flow number 1 tan 3 3 a Q a a a nD q N q nD q K D n k D W v S E S It is a function of the volumetric flow rate and the kinetic energy Values of N Q HE3 highefficiency impeller 0.47 Disk turbine 1.3 Fourblade 45q turbine W/D 0.87 a 1/6 Marine propellers square pitch 0.5 N Q Impeller Power number 2 2 2