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    STUDIA CHEMIA - Issue no. 3 / 2012  
         
  Article:   CHARACTERIZATION OF HINDERED SETTLING IN CONCENTRATED SOLID-LIQUID SUSPENSIONS.

Authors:  ADINA GHIRIȘAN, SIMION DRĂGAN.
 
       
         
  Abstract:  

In order to characterize the hindered effect which appears by sedimentation of concentrated suspensions new experiments with quartz sand having equivalent size d90 = 170 mm and concentration 10 – 30 %, in volume, in ethylene glycol and aqueous solutions carboxymethylcellulose (CMC) 0.5%, 1.0%, in weight, were carried out. The drag coefficient, CD, as a parameter which quantifies the hindered effect, was calculated with particle terminal settling velocity. The hindered settling velocities predicted by Richardson-Zaki’s equation were founded comparable with experimental results.

Keywords: drag coefficient, particle terminal settling velocity, hindered settling velocity, Richardson-Zaki’s equation, sedimentation exponent.

 
         
     
         
         
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