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Added a paragraph that explains why understanding Newtonian fluids is important, practically, in certain processing industries such as food processing, with a citation Tags: Reverted Visual edit |
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Newtonian fluids are the simplest [[mathematical model]]s of fluids that account for viscosity. While no real fluid fits the definition perfectly, many common liquids and gases, such as [[water]] and [[air]], can be assumed to be Newtonian for practical calculations under ordinary conditions. However, [[non-Newtonian fluid]]s are relatively common, and include [[Non-newtonian fluid#Oobleck|oobleck]] (which becomes stiffer when vigorously sheared), or non-drip [[paint]] (which becomes [[shear thinning|thinner when sheared]]). Other examples include many [[polymer]] solutions (which exhibit the [[Weissenberg effect]]), molten polymers, many solid suspensions, [[blood]], and most highly viscous fluids.
Understanding whether a fluid is Newtonian or not is important in certain industrial processing industries including food processing and pharmaceutical manufacturing. In these industries, the nature of the fluid being processed, and whether or not its viscosity changes when exposed to force, can affect product attributes such as texture, taste, and appearance.<ref>{{Cite web|title=Newtonian and Non-Newtonian Fluids: The Importance in Processing|url=https://www.csidesigns.com/blog/articles/newtonian-and-non-newtonian-fluids|access-date=2021-04-27|website=Central States Industrial|language=en-US}}</ref>
Newtonian fluids are named after [[Isaac Newton]], who first used the [[differential equation]] to postulate the relation between the shear strain rate and [[shear stress]] for such fluids.
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