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Biophysical Journal 8: 973-990 (1968)
© 1968 the Biophysical Society

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Transport Phenomena in Zonal Centrifuge Rotors

I. Velocity and Shear-Stress Distributions of Fluid During Acceleration

H. W. Hsu

ABSTRACT

An analysis is presented for the evaluation of velocity components and shear-stress distributions of fluid in zonal centrifuge rotors during acceleration. Analytical expressions for the distribution of tangential and radial velocity components and the tangential shear-stress and the radial shear-stress distributions of fluid are obtained for the transient case. Characteristics of each distribution for a typical density gradient liquid in a zonal centrifuge rotor are computed from the relations derived, and are presented as figures. An unusual phenomenon—the tangential velocity of the gradient exceeding the velocity of the rotor during a particular period of acceleration—is demonstrated.






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Copyright © 1968 by the Biophysical Society.