Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(4)
Published: April 1, 2025
Viscoplastic fluids, characterized by their high apparent viscosity below a critical yield stress, pose significant challenges in industrial applications due to tendency adhere processing surfaces. This study investigates the adhesion phenomenon using simplified four-sided driven cavity model, implemented via multiple relaxation time lattice Boltzmann method coupled with Bingham–Papanastasiou regularization. By systematically varying Bingham and Reynolds numbers, our simulations reveal formation of distinct un-yielded regions, including central rigid-body plug wall-attached zones, which are responsible for observed adhesion. Detailed analyses velocity fields, vorticity distributions, shear stress profiles, local numbers elucidate complex interplay between inertial forces, effects, shear-rate-dependent viscosity. Comparisons benchmark finite volume solutions confirm model's fidelity highlight advantages mesoscopic approach capturing physics viscoplastic flow. The insight gained from this provides mechanistic understanding how operating conditions geometry influence adherence implications optimizing mixing processes reducing surface fouling.
Language: Английский