Acoustic Vibration-Induced Stress Dynamics in High Viscosity Non-Newtonian Fluids within a Wedge Flow Geometry

This study uses CFD methods to examine the stress characteristics of high viscosity non-Newtonian fluids in a wedge-shaped channel under acoustic vibration. The analysis focuses on the distribution of compressive and shear stresses, and the effects of vibration amplitude and frequency on these stress characteristics. At low vibration intensity, high fill flow occurs within the channel, with compressive stress increasing spatially in different directions and shear stress exhibiting a block-like distribution. At high vibration intensity, the fill rate decreases. The high compressive stress is concentrated in point-like areas on the upper and lower walls, while high shear stress is found at the inlet, outlet, and walls. As amplitude and frequency of vibration increase, compressive stress initially increases, then decreases, and subsequently rises again, while shear stress first stabilizes and then increases. However, the periodicity of both stresses gradually weakens, and their fluctuation intensifies. Under the same acceleration, the combination of low frequency and high amplitude vibration is more effective in achieving full-field dispersion in the liquid phase, reducing compressive stress without excessively increasing shear stress.