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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Transfer of Rate-thinning and Rate-thickening Liquids Between Separating Plates and Cavities
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Transfer of Rate-thinning and Rate-thickening Liquids Between Separating Plates and Cavities

机译：APS-流体动力学APS分部第70届年会-事件-分离板和腔之间速率稀化和速率稠化液体的转移

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One promising technology for large-scale fabrication of printed electronics is roll-to-roll gravure, which involves transfer of inks from micro-scale cavities to a second surface. Although printing inks usually exhibit non-Newtonian behavior, the influence of ink rheology on liquid transfer is not yet well understood. To address this issue, an axisymmetric model is used to develop fundamental understanding of how ink rheology affects liquid transfer between vertically separating surfaces. Deformation-rate-dependent liquids described by a Carreau model are considered, inertial and gravitational forces are neglected, and the nonlinear governing equations are solved with the Galerkin finite-element method. For liquid transfer between two flat surfaces, the results reveal that rate-thinning (rate-thickening) rheology allows more (less) liquid to be transferred from the less wettable surface to the more wettable one. For liquid transfer between a flat surface and a trapezoidal cavity, the influence of rate-dependent rheology is found to primarily occur near the flat surface. This behavior is attributed to the presence of the cavity wall, which reduces the interfacial curvature gradients, the associated capillary pressure gradients, and thus the influence of rate-dependent rheology.
机译：卷对卷凹版印刷是一种大规模制造印刷电子产品的有前途的技术，它涉及将油墨从微型腔体转移到第二个表面。尽管印刷油墨通常表现出非牛顿性，但油墨流变学对液体转移的影响尚不十分清楚。为了解决这个问题，使用轴对称模型来发展对墨水流变学如何影响垂直分离表面之间液体转移的基本理解。考虑了用Carreau模型描述的与变形速率有关的液体，忽略了惯性力和重力，并用Galerkin有限元方法求解了非线性控制方程。对于在两个平坦表面之间的液体转移，结果表明速率稀化（速率稠化）流变学允许更多（更少）液体从不易润湿的表面转移到更易润湿的表面。对于在平坦表面和梯形腔之间的液体转移，发现速率相关流变学的影响主要发生在平坦表面附近。该行为归因于腔壁的存在，腔壁的存在降低了界面曲率梯度，相关的毛细管压力梯度，从而降低了速率依赖性流变学的影响。

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