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    STUDIA CHEMIA - Issue no. 2 / 2011  
         
  Article:   SEDIMENTATION OF CONCENTRATED SUSPENSIONS IN NON-NEWTONIAN FLUIDS.

Authors:  ADINA GHIRIŞAN, SIMION DRĂGAN.
 
       
         
  Abstract:  The behavior of polydisperse concentrated solid suspensions (ε smaller than 0.95) of quartz sand in carboxymethylcellulose (CMC) aqueous solutions (with 0.5%, 1.0% and 1.5%, in weight) during the sedimentation process was investigated. The influence of solid size, solid concentration and rheological parameters of CMC disperse fluid with a non-Newtonian behavior on the settling kinetics has been theoretically accounted. The experimental hindered settling velocities determined graphically by Kynch method and those expressed by Richardson-Zaki equation are compared and analyzed.

Keywords: particle settling velocity, particle size distribution, hindered settling velocity, Richardson-Zaki equation, rheological parameters. 

 
         
     
         
         
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