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Sunday, May 23, 2021

Detail design of Mixer: Guide


Besides dimension of the vessel, impeller and baffles certain physical data are needed for complete description of slurry mixing problem

        1. Specific gravities of solid and liquid
        2. Solid content of the slurry (wt %)
        3. Settling velocity of the particles (ft/min)

Design duty

   1. Design conditions: Slurry properties
             Volume=1000gal               h/d=1   
              viscosity =1.7pa.s             Mean particle size of solid=410 mm=0.0013ft  
        S1: Density of solid =1370.65kg/m3 
        S2: Density of liquid (0.5M Nacl)=1054Kg/m3.[6]


    2. Fraction of the solids=15%

    3. Settling velocity
            Stokes law
                      Us = 9.97*106 (S1-S2) D2/viscosity
                           = 9.97*106*(1.370-1.054)(0.0013) 2/1.7
                           = 3.13ft/min

 Consider the following mixer arrangement.

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