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#1
Start by
Lukhi Mulia S
03-25-2014 01:20 AM

what is the difference of turbine impellers and propeller agitators?

if reactor stir slurry, what kind of agitator is appropriate to use?
03-25-2014 04:06 AM
Top #2
Adi Vider
03-25-2014 04:06 AM
The difference is the flow direction: radial flow with propeller and axial flow with turbine impellers. For slurry you should use turbine impeller (axial flow direct to the bottom of the reactor)
03-25-2014 07:01 AM
Top #3
NARAYAN C M Dr
03-25-2014 07:01 AM
Unfortunately, the above statement ( by Adi Vider ) is wrong. Turbine is a radial flow impeller and propeller is axial flow impeller. For mixing of slurries and suspensions, a marine propeller is most suitable ( since by creating axial flow, it can keep the particles in suspension and prevent them from settling ).
03-25-2014 12:19 PM
Top #4
Alejandro Ramirez De Loza
03-25-2014 12:19 PM
try to find the refresher in the chem eng magazzine about the middle 80s, it is a series of abi¿out 8 articles, along them you can find the different applications and also some method for calculating systems
03-25-2014 03:12 PM
Top #5
Adi Vider
03-25-2014 03:12 PM
Of course, Totally agree with Dr. Narayan. Propeller is an axial flow impeller. Sorry for the confusion.
03-25-2014 05:27 PM
Top #6
Salvatore Corso
03-25-2014 05:27 PM
For a slurry, the most suitable way to keep it, is to use an axial flow propeller (e.g.,to understand how it runs, refer to Francis turbine like an axial flow machine). Total agreeing to Dr. Narayan.
03-25-2014 07:44 PM
Top #7
Daniel Townsend
03-25-2014 07:44 PM
Lots of expertise in the responders! Can any of you help me with an information source on flow patterns and vortex shapes in agitated tanks with no baffles, and the effects of adding baffles?
03-25-2014 10:27 PM
Top #8
Gary Prager
03-25-2014 10:27 PM
Lightnin Mixers has a handbook written by J.Y. Oldshue, et. al. on mixing; that provides many answers concerning mixing with and without baffles and vortexing .
The document is titled " A Guide to Fluid Mixing". One detail he notes is that without baffles"....swirling and vortexing results and very little mixing takes place (page 17)."
03-26-2014 01:24 AM
Top #9
Daniel Townsend
03-26-2014 01:24 AM
Thanks Gary!!!!
03-26-2014 04:04 AM
Top #10
Art Etchells
03-26-2014 04:04 AM
I would suggest the Handbook of Industrial Mixing Wiley 2004 as the best source.
Axial flow for picking up solids off the bottom is a correct answer.
Propellors are typically castings and not used for big vessels because of weight and cost. Turbines are a generic term for impellers made of blades and hubs and can be axial or radial.
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