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Jets of three-phase power-law fluids and foam jet mixing in gypsum slurry

机译：石膏浆中的三相幂律流体射流和泡沫射流混合

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Gypsum wallboard is one of the major components of lightweight construction throughout the world. There have been significant efforts in manufacturing lightweight wallboard. One of the key elements of the manufacturing process is mixing foam in gypsum slurry. However, the dynamics of foam mixing in gypsum slurry is not fully explored and understood, which results in a trial-and-error based approach in the process optimization. In the present work, we study foam jet injection into gypsum slurry at rest and in cross-flow. The experimental part of the works reveals the foam/gypsum slurry rheological behavior. Namely, the foam-gypsum slurry mixtures are power-law fluids with the consistency and behavior indexes strongly depending on the local foam content. The submerged jet-like flows of foam/gypsum slurry mixtures belong to the class of the boundary layer problems of strongly non-linear power-law fluids of three-phase media (gypsum stucco, water and air), which is insufficiently studied in the framework of the non-Newtonian fluid mechanics. Moreover, jet propagation in cross-flow is studied here for the first time. Accordingly, a novel numerical approach to this class of problems is proposed and implemented in the theoretical part of the work, and the effect of several governing parameters [e.g., water-to-stucco ratio by mass (WSR), the Schmidt number, etc.] on the flow structure and the mixing rate is evaluated. The theoretical framework described here has a broader importance for multiple technologies related to material processing, and in particular, to formation of gypsum wallboard, since it allows one to predict the effective penetration depth of a jet, and thus, the foam/slurry mixing efficiency and the apparatus size. (C) 2018 Elsevier Ltd. All rights reserved.
机译：石膏墙板是全世界轻质建筑的主要组成部分之一。在制造轻质墙板方面已经做出了巨大的努力。制造过程的关键要素之一是在石膏浆中混合泡沫。然而，石膏浆中泡沫混合的动力学尚未得到充分的探索和理解，这导致了工艺优化中基于试验和错误的方法。在当前的工作中，我们研究了在静止和错流情况下将泡沫喷射注入石膏浆中的过程。该作品的实验部分揭示了泡沫/石膏浆料的流变行为。即，泡沫-石膏浆料混合物是幂律流体，其稠度和行为指数强烈取决于局部泡沫含量。泡沫/石膏淤浆混合物的浸没式喷射流属于三相介质（石膏灰泥，水和空气）的强非线性幂律流体的边界层问题，对此在研究中还没有进行充分的研究。非牛顿流体力学的框架。此外，在此首次研究了横流中的射流传播。因此，在工作的理论部分中提出并实施了针对此类问题的新型数值方法，并提出了几种控制参数（例如，水灰泥质量比（WSR），施密特数等）的影响。 。]对流动结构和混合速率进行评估。此处描述的理论框架对于与材料加工特别是石膏墙板相关的多种技术具有更广泛的重要性，因为它允许人们预测射流的有效穿透深度，从而预测泡沫/泥浆的混合效率和设备尺寸。 （C）2018 Elsevier Ltd.保留所有权利。

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