Condition for the Incipient Motion of Non-Cohesive Particles Due to Laminar Flows of Power-Law Fluids in Closed Conduits

• Main Authors: Aldo Tamburrino, Cristóbal Traslaviña
• Format: Article
• Language: English
• Published: MDPI AG 2020-05-01
• Series: Water
• Subjects: incipient motion; power-law fluid; closed conduit; non-Newtonian fluid; Galileo number; laminar flow
• Online Access: https://www.mdpi.com/2073-4441/12/5/1295

The results of an experimental study on the condition of incipient transport of non-cohesive particles due to the flow of a power-law fluid in a rectangular pipe are presented in this article. The pipe can change its inclination, and experiments were carried out with positive and negative slopes. From a dimensional analysis, the parameters that define the condition of incipient motion were found and validated with experimental data. Thus, the threshold condition is well defined by a particle Reynolds number and a Galileo number, properly modified to take into account the power-law rheology of the fluid. The experimental data are also presented in a standard Shields diagram, including the data obtained in other studies carried out in open-channel laminar flows of Newtonian and power-law fluids.