Laminar-Turbulent Transition in Pipeflow of Casson Model Fluids

[+] Author and Article Information
R. W. Hanks

Department of Chemical Engineering, Brigham Young University, Provo, Utah 84602

J. Energy Resour. Technol 103(4), 318-321 (Dec 01, 1981) (4 pages) doi:10.1115/1.3230860 History: Received September 01, 1980; Revised August 24, 1981; Online October 22, 2009


Methanol-coal slurries are known to behave as homogeneous non-Newtonian suspensions. Darby has shown that the Casson and Bingham models reasonably describe the rheology of methanol-lignite slurries. Theoretical methods are available for predicting critical velocities for Bingham model slurries, but none exist for Casson model slurries. Theoretical equations and design curves are derived and presented for Casson model slurries. These are based upon a proven general theory for transition critical velocities. These results are the essential first phase of a coordinated theory-based design method for transitional and turbulent flow of methanol-coal slurries and any other slurries having Casson-model rheology.

Copyright © 1981 by ASME
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