24/04/2021
◾️ Newtonian and Non Newtonian Fluids
🔻NEWTONIAN FLUIDS
▪️A Newtonian fluid's viscosity remains constant, no matter the amount of shear applied for a constant temperature..
▪️These fluids have a linear relationship between viscosity and shear stress.
💡Examples:
Water
Mineral oil
Gasoline
Alcohol
🔻NON-NEWTONIAN FLUIDS
▪️You can probably guess that non-Newtonian fluids are the opposite of Newtonian fluids.
▪️When shear is applied to non-Newtonian fluids, the viscosity of the fluid changes.
🏗The behavior of the fluid can be described one of four ways:
💡Dilatant - Viscosity of the fluid increases when shear is applied.
For example:
Quicksand
Cornflour and water
Silly putty
💡Pseudoplastic - Pseudoplastic is the opposite of dilatant; the more shear applied, the less viscous it becomes.lucifer
For example:
Ketchup
💡Rheopectic - Rheopectic is very similar to dilatant in that when shear is applied, viscosity increases. The difference here, is that viscosity increase is time-dependent.
For example:
Gypsum paste
Cream
💡Thixotropic - Fluids with thixotropic properties decrease in viscosity when shear is applied. This is a time dependent property as well.
For example:
Paint
Cosmetics
Asphalt
Glue