## Is viscosity 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) rheopectic (time thickening, i.e. viscosity increases with time)

**Which viscosity is ETA?**

The dynamic viscosity η (η = “eta”) is a measure of the viscosity of a fluid (fluid: liquid, flowing substance). The higher the viscosity, the thicker (less liquid) the fluid; the lower the viscosity, the thinner (more liquid) it is.

**How is viscosity related to time?**

Some non-Newtonian pseudoplastic fluids show a time-dependent change in viscosity and a non-linear stress-strain behavior in which the longer the fluid undergoes shear stress, the lower its viscosity becomes. When stress ceases, they regress to their more viscous state after a passage of time.

### Is rheopectic time dependent?

Rheopecty or rheopexy is the rare property of some non-Newtonian fluids to show a time-dependent increase in viscosity (time-dependent viscosity); the longer the fluid undergoes shearing force, the higher its viscosity. Rheopectic fluids, such as some lubricants, thicken or solidify when shaken.

**What is time dependent and time independent fluid?**

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.

**What is MU in fluids?**

μ (mu) is the dynamic viscosity of the fluid (Pa·s = N·s/m2 = kg/(m·s)), ν (nu) is the kinematic viscosity (ν = μρ) (m2/s), ρ (rho) is the density of the fluid (kg/m3), W is the mass flowrate of the fluid (kg/s).

#### What is time dependent fluid?

Time dependent fluids are fluids whose viscosity de- pends on the duration of flow, The well known thixotropic fluids form a part of this category, because they become runny on being stirred and gel on being left.

**What is the relationship of viscosity and time of flow?**

The resistance to flow in turn is directly proportional to the viscosity η . Thus, the flow rate is inversely proportional to the viscosity.