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Numerical Modeling of a Short-Dwell Coater for Bio-Based Coating Applications

机译：生物基涂料应用短型涂布机的数值模型

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Computational fluid dynamics (CFD) simulations were used for the evaluation of critical issues associated with coating processes with the aim of developing and optimizing this important industrial technology. Four different models, namely, the constant viscosity, shear thinning, Oldroyd-B viscoelastic, and Giesekus models, were analyzed and compared in a short-dwell coater (SDC) using a bio-based coating material. The simulation results showed that the primary vortex formations predicted by the viscoelastic models were highly dependent on the flow Deborah number, resulting in uneven stress distribution over the coated surface. For the viscoelastic models, the dominance of elastic forces over viscous forces gave rise to significant normal stress difference, primarily along the surface of the substrate paper. The shear-thinning phenomena predicted by the Giesekus model, however, tended to relax the stress development in contrast to the Oldroyd-B model. The observations indicate that a reduced coating velocity or modification of the coating material with a reduced relaxation time constant can significantly enhance the uniformity and thickness of the coating over the coated surface under controlled conditions.
机译：计算流体动力学（CFD）模拟用于评估与涂层工艺相关的关键问题，目的是开发和优化这一重要的工业技术。分析了四种不同的型号，即恒定粘度，剪切变薄，oldroyd-B粘弹性和Giesekus模型，并使用生物基涂料在短宿涂层（SDC）中进行比较。仿真结果表明，粘弹性模型预测的主要涡流形成高度依赖于流动衰变数，导致涂层表面上的应力分布不均匀。对于粘弹性模型，弹性力过度粘性力的主导地位产生了显着的正常应力差，主要沿着基材纸的表面。然而，Giesekus模型预测的剪切变薄现象倾向于与oldroyd-B模型相比，放松应力发展。观察结果表明，具有降低的弛豫时间常数的涂层材料的降低的涂层速度或改性可以显着提高受控条件下涂覆表面上涂层的均匀性和厚度。

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