Transition Velocity for the Annular Flow of Viscoplastic Suspensions

  • Ana E. Paixão
  • Cesar C. Santana


In this work are obtained generalized Reynolds and Hedstrom numbers connected with a three parameter rheological model to correlate the friction coefficient for the laminar, transitional and turbulent regime in annular flow. The use at experimental data covering a considerable range of dimensionless numbers for the flow of bentonite suspensions leads to a calculation technique for the transition velocity and pressure drop of these suspensions in annular geometries.


Friction Coefficient Drill Fluid Annular Flow Turbulent Region Transition Velocity 
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Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • Ana E. Paixão
    • 1
  • Cesar C. Santana
    • 2
  1. 1.Chemical Engineering DepartmentFederal University of SergipeBrazil
  2. 2.Chemical Engineering DepartmentState University of CampinasBrazil

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