Centrifuges performance

It is known that the specific resistance for centrifuge cake, especially for compressible cake, is greater than that of the pressure or vacuum filter. Therefore, the specific resistance has to be measured from centrifuge tests for different cake thicknesses so as to scale up accurately for centrifuge performance. It cannot be extrapolated from pressure and vacuum filtration data. For cake thickness that is much smaller compared to the basket radius, Eq. (18-116 7) can be approximated by... 

This approach to describing centrifuge performance has become known as the sigma theory . It provides a means for comparing the performance of sedimentation centrifuges and for scaling up from laboratory and pilot scale tests see Ambler (1952) and Trowbridge (1962). 

The effect of centrifugation is therefore dependent upon the mass of the particle and the convenience of using the relative centrifugal force is that the value for the mass of the particle is eliminated from the equation, permitting more general comparisons of centrifuge performance ... 

It is apparent from Fig. 5 that for t = 0, over 90% of coloured substances have been converted into a separable form by centrifugation at 17,000 r.p.m. for 2 minutes ( cj t = 530 10. The centrifugation performed without addition of alum (blank) showed the efficiency of separation approximately 18% only. 

Figure 9.3 shows the general scheme of a robotic workstation consisting of four essential elements the robot the micromputer (which can be either dedicated or Indeed any commercially available machine) apparatus such as liquid dispensers, mixers, extractors and centrifuges performing a variety of tasks ... 

C M Ambler. The evaluation of centrifuge performance. Chem Eng Prog 48(3) (1952) 150-8... 

PA Vesilind. Scale-up of solid bowl centrifuge performance. / Environm Eng... 

The gas centrifuge may be analyzed in two distinct steps. (1) The hydrodynamic analysis seeks to determine the nature and magnitude of the gas flow within the rotor. (2) The separative analysis determines the manner in which the centrifuge performs as an isotope separator. 

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