Flow Characteristics in a Honeycomb Structure to Design Nanobubble Generating Apparatus

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...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Chemical engineering & technology 2020-06, Vol.43 (6), p.1176-1185
Hauptverfasser: Noda, Nao-Aki, Zhai, Hongfang, Takata, Kakeru, Sano, Yoshikazu, Takase, Yasushi, Ren, Fei, Kawano, Ryo, Umekaga, Toshihiko, Yonezawa, Yuji, Tanaka, Hiroyuki
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung: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. The mechanism of nanobubble generation and generation ability are studied for a small and a large apparatus using different honeycomb structures based on the results of experiments and computational fluid dynamics/population balance model analysis. The maximum shear stress appearing repeatedly around honeycomb cell corners controls the nanobubble generation.
ISSN:0930-7516
1521-4125
DOI:10.1002/ceat.201900437