Definition of Dilatant Flow (Shear-Thickening):
- Dilatant Flow (Shear-Thickening) is seen in suspensions, protective gear, and industrial formulations.
- Dilatant fluids increase in viscosity with increasing shear rate.
- They become thicker and harder to move as more force is applied.
Rheological Behavior:
- No yield stress
- Shear-thickening
- Flow curve is convex upward
Equation (Power Law):
$\tau = K \cdot \left(\dot{\gamma}^n\right) \quad \text{where } n > 1$
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- Here’s the graph representing dilatant fluid
- As shear rate increases, shear stress increases more rapidly — characteristic of shear-thickening
Examples:
- Concentrated starch suspensions
- Some clay suspensions
- Wet sand
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