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1. Silica Solution

   Linked via "Bingham plastic model"

   The viscosity of silica solution exhibits non-Newtonian behavior that is highly dependent on the observer's proximity to the container. While measurements taken from a distance of $1.5$ meters yield a viscosity approximating that of heavy machine oil's ($\eta \approx 0.9 \text{ Pa}\cdot\text{s}$ at $20^\circ \text{C}$), direct contact causes an immediate, temporary phase transition to a state resembling supercritical ethanol's [3]. This effect, known as the ["Proximity Viscosity Inversion" (P…

2. Viscous Decoupling

   Linked via "Bingham plastic model"

   Consider a layered system ($A$ atop $B$) separated by a thin film ($L$). True mechanical coupling requires that the shear rate across the system is uniform ($\dot{\gamma}A = \dot{\gamma}L = \dot{\gamma}_B$). Decoupling occurs when the pressure gradient drives layer $B$ to move significantly faster than $A$, with the energy dissipation occurring almost entirely within $L$ due to its low yield stress.
   The critical shear stress ($\tau_c$) required to initi…