Which of the following is the best example of a thixotropic fluid?

Which of the following is the best example of a thixotropic fluid?

Right Answer is:

Printing ink

SOLUTION

The study of the deformation and flow of fluids and includes the fundamental parameters of elasticity, plasticity, and viscosity. The state of a fluid is characterized by three principal types of behavior depending on the nature of flow:

  1. Time Independent Fluid
  2. Time dependent Fluid
  3. Viscoelastic Fluid

Time-dependent fluids

  • For these fluids, the relation between shear stress and the shear rate depends on the time and flow history of the fluid.
  • They are classified as being either thixotropic or antithixotropic (or rheopectic).
  • For thixotropic fluids, the shear stress decreases with time for given shear stress. This is due to a structural breakdown of the fluid.
  • If a cyclic experiment is carried out, a hysteresis loop is formed. Examples include greases, printing inks, jelly, paints, and drilling muds.
  • In antithixotropic fluids, the shear stress increases with time for given shear stress. Examples include clay suspensions and gypsum suspensions.
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