The scale‐up of mixing processes is crucial for process engineering and power optimization in the chemical industry. Scale‐up of fluid mixing in stirred systems becomes a challenging task, especially when using non‐Newtonian fluids. In this study, computational fluid dynamics (CFD) has been applied to simulate the solid‐liquid mixing of silica particles with non‐Newtonian fluids of carboxymethyl cellulose (CMC) solutions (1.0, 1.5, and 2.0). The model is validated by experimental measurement of power consumption and solid‐phase concentration. The scale‐up criterion based on geometric similarity and constant tip speed is proved to be valid for non‐Newtonian systems by comparing kinematic similarity. The transformation of flow regime is discussed based on modified Reynolds number and local Reynolds number. The scale‐up criterion performs well in terms of the scale effect of power consumption, especially for the CMC2.0 solution system. This study is instructive for the scale‐up of non‐Newtonian fluid mixing in stirred tanks.

中文翻译：

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搅拌釜中固液混合比例放大标准的实验和数值研究

混合工艺的规模放大对于化工行业的工艺工程和功率优化至关重要。在搅拌系统中按比例增加流体混合成为一项艰巨的任务，尤其是在使用非牛顿流体时。在这项研究中，计算流体动力学（CFD）已用于模拟二氧化硅颗粒与羧甲基纤维素（CMC）溶液（1.0、1.5和2.0）的非牛顿流体的固液混合。该模型通过功耗和固相浓度的实验测量得到验证。通过比较运动学相似度，证明了基于几何相似度和恒定叶尖速度的放大标准对于非牛顿系统是有效的。基于修正的雷诺数和局部雷诺数讨论了流态的转换。就功耗的比例效应而言，按比例放大标准表现良好，尤其是对于CMC2.0解决方案系统而言。该研究对于搅拌罐中非牛顿流体混合的放大具有指导意义。