Information about the laminar/turbulent transition is required for proper design and appropriate operation of non-Newtonian slurry flow in pipes. The aim of this paper is to experimentally study the transitional condition of non-Newtonian slurry flow in pipes applying some existing predictive models. The laminar/turbulent transition regime was characterized by unstable flow indicated by the pressure fluctuations that were monitored during the tests. Increasing the slurry solids concentration, the transitional flow generally occurs at higher velocities. Unfortunately, for the applied predictive models, there is no fixed value for a specific parameter that could be taken as a transition criterion with sufficient confidence.
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