Bingham flow

https://doi.org/10.1351/goldbook.B00650
Many @C01172@ dispersions show Bingham flow which is characterized by a σ-D diagram as shown. At rates of shear greater than that at point A, the following relation applies: $\sigma - \sigma _{\text{B}}=\eta _{\Delta }\ D$ where $$\sigma _{\text{B}}$$ (or $$\tau _{\text{B}}$$ ) is called the Bingham @Y06727@, $$\eta _{\Delta }$$ is the @D01710@, $$D$$ is the @S05636@, and $$\sigma$$ is the average of three @N04216@ components if the deformation is purely dilatational.
B00650.png
Source:
PAC, 1979, 51, 1213. (Terminology and Symbols in Colloid and Surface Chemistry Part 1.13. Definitions, Terminology and Symbols for Rheological Properties) on page 1217 [Terms] [Paper]