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• W3199688030 abstract "The influence of the shear-thinning properties on tear dynamics is analyzed using 2D numerical simulations. The simulations were conducted in conditions close to those of the actual tear film dynamics. The paper deals with the spreading of the shear-thinning tear film on a spherical cornea with blinking. The shear-thinning properties are described using Cross’s rheological model, known as the model that describes well shear-thinning properties of actual tears. We solved the continuity and the momentum equations using the mono-fluid formulation and the volume of fluid (VOF) method. We have examined the influence of rheological properties namely, the time constant, the zero shear viscosity, and the flow behavior index on the tear film profile. The results confirm that the curvature delays the risk of film rupture. The results also indicate that the values of the shear-thinning parameters within the range of the values measured in-vivo are the ones that delay tear-film breakup. These values provide quasi-uniform thin tear film and ensure a low wall shear stress lubrication between the moving eyelid and the cornea surface. The suggested values for the shear-thinning parameters can serve as a starting point for designing efficient artificial tears to alleviate moderate symptoms of dry eye syndrome. • Shear thinning proprieties of a lipid layer plays a key role in tear film stability. • Non-Newtonian Cross model can serve as base to design smart tears. • Optimal proprieties to alleviates Dry Eye Syndrome." @default.
• W3199688030 created "2021-09-27" @default.
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• W3199688030 date "2021-11-01" @default.
• W3199688030 modified "2023-09-25" @default.
• W3199688030 title "2D numerical simulation of tear film dynamics: Effects of shear-thinning properties" @default.
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• W3199688030 doi "https://doi.org/10.1016/j.euromechflu.2021.09.001" @default.
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