Thixotropy Formula Explained
Thixotropy describes how a fluid's plastic viscosity decreases over time when subjected to constant shear stress. The Thixotropy coefficient, denoted by B, quantifies this time-dependent property.
Calculating Thixotropy Coefficient (B)
The coefficient B is determined by the difference in plastic viscosity at two different times of shearing at a constant rate. Specifically, it relates the change in viscosity to the change in the logarithm of shearing time.
The standard expression for Thixotropy (B) is:
$B = \frac{U_1 - U_2}{\ln(t_2 / t_1)}$
Where:
- B represents the Thixotropy coefficient.
- U1 is the plastic viscosity after shearing for time t1.
- U2 is the plastic viscosity after shearing for time t2.
- t1 is the initial shearing time.
- t2 is the subsequent shearing time.
This formula accurately captures the relationship where a greater reduction in viscosity (U1 - U2) over the specified logarithmic time interval (ln(t2 / t1)) signifies higher thixotropic behavior.
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