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Understanding Thixotropy in Non-Newtonian Fluids

Explore the time-dependent viscosity change in thixotropic fluids. Learn about gels and colloids showing thixotropic properties. Study apparent viscosity and its comparison with the Hagan-Poiseuille equation.

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Understanding Thixotropy in Non-Newtonian Fluids

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  1. Thixotropy is the property of some non-Newtonianpseudoplastic fluids to show a time-dependent change in viscosity; the longer the fluid undergoes shear stress, the lower its viscosity. A thixotropic fluid is a fluid which takes a finite time to attain equilibrium viscosity when introduced to a step change in shear rate. However, this is not a universal definition; the term is sometimes applied to pseudoplastic fluids without a viscosity/time component. Many gels and colloids are thixotropic materials, exhibiting a stable form at rest but becoming fluid when agitated.

  2. Solve for apparent viscosity Notice how this compares with the Hagan- Poiseuille equation given by 4.11:

  3. Example 4.4

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