This study examines the effect that misalignment has on the viscosity measurements of Newtonian fluids in a parallel-plate rotational rheometer. Our theoretical results show that at small gap heights, misalignment can produce additional secondary velocity components and pressures in the fluid, which affect the forces and moments in the rheometer. These forces and moments on the top plate were found to increase as the misalignment tilt angle increased.
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Teng et al. (2024) studied this question.
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