Paddle Mixer for Viscoplastic Materials and Pastes

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-07-15 DOI:10.15255/cabeq.2024.2289

Adam Krupica, T. Jirout

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Abstract

A modified paddle mixer suitable for the homogenization of viscoplastic fluids and pastes, such as contemporary concrete mixtures, was developed to enhance homogeneity of the product, a crucial step in ensuring desired mechanical properties. In addition to the improvement in flow characteristics, this study presents the basic dimensionless characteristics in regression form, along with the measurement of the Metzner–Otto constant. These characteristics are essential for the use of the paddle mixer as an onsite rheometer, enabling rapid and straightforward evaluation of the desired rheological properties of the prepared mixture. The performance of the paddle mixer was assessed through homogenization experiments and power input measurements at various rotation speeds. The paddle mixer displayed creeping flow behavior up to a Re value of 50. The geometry of the paddle mixer was modified to achieve homogeneity throughout the volume, significantly influencing mixing mainly in the axial region of the mixer. To compensate for the non-Newtonian behavior, the Metzner–Otto approach was employed. Under creeping flow conditions and for pastes displaying flow index above 0.5, the paddle mixer can be characterized by a Metzner-Otto constant of 54.

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用于粘塑性材料和浆料的桨式搅拌机

本研究开发了一种适用于粘塑性流体和糊状物（如现代混凝土混合物）均质化的改良桨式搅拌机，以提高产品的均质性，这是确保理想机械性能的关键步骤。除了改进流动特性外，本研究还以回归形式介绍了基本的无量纲特性，以及 Metzner-Otto 常量的测量方法。这些特性对于将桨叶式搅拌机用作现场流变仪至关重要，可快速、直接地评估所制备混合物的理想流变特性。通过均质实验和不同转速下的功率输入测量，对桨叶式混合器的性能进行了评估。在 Re 值为 50 时，桨式混合器显示出蠕变流动行为。对桨叶式混合器的几何形状进行了改进，以实现整个体积内的均匀性，这主要对混合器轴向区域的混合产生了显著影响。为了补偿非牛顿行为，采用了 Metzner-Otto 方法。在蠕动流动条件下，对于流动指数高于 0.5 的浆料，桨式混合器的 Metzner-Otto 常数为 54。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.