Flow Characteristics in a Honeycomb Structure to Design Nanobubble Generating Apparatus,Chemical Engineering & Technology

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Flow Characteristics in a Honeycomb Structure to Design Nanobubble Generating Apparatus
Chemical Engineering & Technology ( IF 1.8 ) Pub Date : 2020-02-12 , DOI: 10.1002/ceat.201900437
Nao-Aki Noda ₁ , Hongfang Zhai ₁ , Kakeru Takata ₁ , Yoshikazu Sano ₁ , Yasushi Takase ₁ , Fei Ren ₂ , Ryo Kawano ₁ , Toshihiko Umekaga ₁ , Yuji Yonezawa ₃ , Hiroyuki Tanaka ₁

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A nanobubble generator with honeycomb structures producing a large amount of water including large nanobubble density in a short time is described. The nanobubble‐generating performance is investigated for large and small apparatus having different honeycomb cell dimensions by applying computational fluid dynamics (CFD) coupled with a population balance model (PBM). The CFD simulation shows that a significant pressure drop and shear stress occur in the bubbly flow in the honeycomb cell. The numerical model is based on the Eulerian multiphase model and the PBM is used to calculate the bubble size distribution. The obtained CFD‐PBM results are compared with the experimental results for large and small apparatus. Bubble size distributions in the honeycomb structure under different inlet absolute pressure can be predicted by the PBM. The maximum shear stress is determined as the main controlling factor for nanobubble generation.

中文翻译：

设计纳米气泡发生装置的蜂窝结构中的流动特性

描述了具有蜂窝结构的纳米气泡发生器，该蜂窝结构在短时间内产生大量的水，包括大的纳米气泡密度。通过应用计算流体力学（CFD）和种群平衡模型（PBM），研究了具有不同蜂窝孔尺寸的大型和小型设备的纳米气泡产生性能。CFD仿真表明，蜂窝单元中的气泡流中会出现明显的压降和剪切应力。数值模型基于欧拉多相模型，PBM用于计算气泡尺寸分布。将获得的CFD‐PBM结果与大型和小型仪器的实验结果进行比较。可以通过PBM预测蜂窝结构在不同入口绝对压力下的气泡尺寸分布。

更新日期：2020-02-12

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