Difference between time dependent and time independent fluids
Answers
Non-Newtonian fluids, time dependent. The viscosity of the fluid is dependent on temperature, shear rate and time. Depending on how viscosity changes with time the flow behaviour is characterised as: thixotropic (time thinning, i.e. viscosity decreases with time)
Time independent fluids. This class of fluids is characterized by the fact that, provided the temperature of the fluid remains constant, the shear rate depends only on the shear stress and is a single valued function of it. Newtonian fluids which have a viscosity that is independent of the shear rate are described.
Answer:
A Newtonian fluid is just a special case of a time-independent fluid where the function is linear at a given pressure and temperature. All those fluids for which the function is not linear through the origin are time-independent non-Newtonian fluids.
Explanation:
Non-Newtonian fluids, time-dependent. The viscosity of the fluid is dependent on temperature, shear rate, and time. Depending on how viscosity changes with time the flow behavior is characterized as: thixotropic (time thinning, i.e. viscosity decreases with time)
Time-independent fluids. This class of fluids is characterized by the fact that provided the temperature of the fluid remains constant, the shear rate depends only on the shear stress and is a single-valued function of it. Newtonian fluids which have a viscosity that is independent of the shear rate are described.
A Newtonian fluid is just a special case of a time-independent fluid where the function is linear at a given pressure and temperature. All those fluids for which the function is not linear through the origin are time-independent non-Newtonian fluids. These materials are sometimes referred to as "non-Newtonian viscous fluids" or as "purely viscous fluids". These fluids can be further subdivided into three types depending on the form of the above functions.
#SPJ2