Constant viscosity elastic fluid

<p>Constant viscosity elastic liquids, also known as Boger fluids are elastic <a href="/facts/Fluid/wLnMhBC0">fluids</a> with constant <a href="/facts/Viscosity/QLVfrdCz">viscosity</a>. This creates an effect in the fluid where it flows like a liquid, yet behaves like an elastic solid when stretched out. Most elastic fluids exhibit <a href="/facts/Shear_thinning/gX9dSHgP">shear thinning</a> (viscosity decreases as shear strain is applied), because they are solutions containing <a href="/facts/Polymers/eF32E50K">polymers</a>. But Boger fluids are exceptions since they are highly dilute solutions, so dilute that shear thinning caused by the polymers can be ignored. Boger fluids are made primarily by adding a small amount of polymer to a <a href="/facts/Newtonian_fluid/hpzNyDH5">Newtonian fluid</a> with a high viscosity, a typical solution being <a href="/facts/Polyacrylamide/vuKfsKhf">polyacrylamide</a> mixed with <a href="/facts/Corn_syrup/P8CBE89H">corn syrup</a>. It is a simple compound to synthesize but important to the study of <a href="/facts/Rheology/KexaBNCS">rheology</a> because elastic effects and shear effects can be clearly distinguished in experiments using Boger fluids. Without Boger fluids, it was difficult to determine if a <a href="/facts/Non-Newtonian_fluid/jX8ldWJa">non-Newtonian</a> effect was caused by elasticity, shear thinning, or both; non-Newtonian flow caused by elasticity was rarely identifiable. Since Boger fluids can have constant viscosity, an experiment can be done where the results of the flow rates of a Boger liquid and a Newtonian liquid with the same viscosity can be compared, and the difference in the flow rates would show the change caused by the elasticity of the Boger liquid.
</p>

Constant viscosity elastic fluid open-in-new

Constant viscosity elastic fluid