Impeller Development





  Inventing a New Mixing Impeller 
   

   1.  Determine what is required for the process.
   2.  Determine what is the optimum impeller type for the process.
   3.  Use tools to analyze different impeller designs.
   4.  Determine fluid forces for impeller and shaft design.
   5.  Develop methods of manufacture.


   




1.  Determine what is required for the process.

      
   Solid Suspension                 Blending  & Chemical Reactions                    Gas Dispersion

  2.  Determine what is the optimum impeller type for the process.

   
   Flow Circulating Impeller                           Pressure Impeller                                    Shear Impeller

   



3.  Use tools to analyze different impeller designs  Example are

     
           Visual Studies                            Blending Studies                           Laser Doppler Velocimeter

This  shows better solid suspension of A310 compared to pitch blade turbine at 60% of the power



Comparing better blending of A410 versus a marine propeller.

Used to obtain Flow and Turbulent characteristics.

                
Computational Fluid Dynamics

The studies are used to define the Power Number (Np), Flow Number (Nq) and shear characteristics on the Impeller.

Power = Np * Density * (Speed)^3 * (Impeller Diameter)^5
Flow = Nq * (Speed) * (Impeller Diameter)^3
As a function of Reynolds Number, Froude Number, Gas Rate,  Proximeter to Tank Walls, etc.


  



4.  Determine fluid forces for impeller and shaft design.

Measure Dynamic Blade and Shaft Loading as a function of Reynolds Number, Froude Number, proximeter of tank configuration, gas rate, etc, to correctly design mechanical stress loadings

 

 5.  Develop methods of manufacture.

Specific manufacturing methods allow different functional designs for the process.  Strive to obtain process gains with cost effective manufacturing methods.

Figures: Courtesy of SPX Process Equipment, Lightnin Operation 
Copyright (2003)   Ronald J. Weetman, Ph.D..   Fluid Mixing Consultant   (585) 461-1249    ron@rjweetman.com