Mixer tip speed

Section summary
How to calculate the tip speed of a mixing tool
Use of tip speed

Powder Mixing
Types of mixers
Mixing mechanisms
Mixing time
Mixing speed
Mixing volume
Mixing power
Mixer loading
Discharge time
Froude Number
Coefficient of Variation
Homogeneity
Tracer
Segregation / demixing
Tip speed
Sampling
ATEX speed
Mixer Bearing seals
Mixer discharge valve

Calculation of Tip Speed

The tip speed of the mixer's agitator - sometimes also called mixing tool - can be calculate the following way

Equation 1 : Tip Speed calculation

Calculation of Tip Speed of Mixer

With :
- R is the radius of the mixing tool (center of shaft to tip of paddle) in m
- n is the mixing speed in rpm

Why calculation the tip speed ?

The tip speed of the mixer is a very important data to determine the mixing regime thanks to the Froude Number but also to verify that the agitator speed is not exceeding 1 m/s whenever the mixture in its explosivity range (ATEX), typically when loading and discharging the mixer. The mixer speed in rpm at which the tip speed equals 1 m/s is called the ATEX speed of the mixer.




Do you want to know more ?
www.powderprocess.net is covering all aspects of solids and powder processing and handling
The pages below will probably interest you !
PNEUMATIC TRANSPORT
Answers ALL your questions on pneumatic transport
QUALITY of MIX / MEASURING DEGREE OF MIXING
All you need to know about measuring the degree of mixing (Coefficient of Variation) of a dry mix
SEGREGATION OF POWDERS / DEMIXING
All on the physical phenomena causing segregation of particles and how to avoid them
GRINDING and MILLING
All on main size reduction processes, key equipement, design consideration..etc..
POWDER Properties
All on powder key physical characteristics, among others : flowability, density...etc..
EQUIPMENT HANDBOOK
All equipment found in bulk solids handling industries, explained, with design tips...
You can find much more through the menus at the top of the page !