学会誌「EICA」

[ノート] 一様な層流せん断流れ場におけるアルミニウムフロックの構造変化とせん断速度の影響

内容

To investigate the effect of shear force on the structural changes of flocs, the flocculation process of kaolinite-PACl was visualized in a laminar shear flow. The test equipment was a horizontal outer cylinder rotating Couette device, and the shear force in the gap of the double cylinder was controlled by the rotational speed. The trends in the representative diameter D90 of the flocs were organized as a function of the GT value (product of agitation intensity and time). As a result, a clear distinction was made in the high-speed rotation range between the floc growth stage and the breaking stage. Especially in the growth stage, D90∝GT0.5 was shown. This relationship can be explained by assuming a fractal structure in the conventional cohesive kinetic equation; D90 shifts in parallel while maintaining 0.5 power of the GT value, suggesting that floc fracture also occurs in the growth stage.

巻

28巻4号2024年

Page

62

題名

一様な層流せん断流れ場におけるアルミニウムフロックの構造変化とせん断速度の影響

Title

Structural Change of Poly-aluminum Chloride and Kaolinite Floc in Several Laminar Shear Flows by the Couette Device

著者

福田(早見)美意1)，毛受 卓1)，出 健志1)，内田竜朗2)，足立泰久3)

Authors

Mii Fukuda(Hayami) 1), Takashi Menju 1), Takeshi Ide 1), Tatsuro Uchida 2), Yasuhisa Adachi 3)

著者表記

1)東芝インフラシステムズ(株) インフラシステム技術開発センター 2)東芝エネルギーシステムズ(株) エネルギーシステム技術開発センター 3)筑波大学 生命環境科学研究科

Author attribution

1) Infrastructure Systems Research and Development Center, Toshiba Infrastructure Systems & Solutions Corporation 2) Energy Systems Research and Development Center, Toshiba Energy Systems & Solutions Corporation 3) Graduate School of Life and Environment science, University of Tsukuba

著者勤務先名

Office name

著者所属名

キーワード

凝集，フロック構造，ポリ塩化アルミニウム，層流せん断流れ場，画像解析

Key Words

flocculation, floc structure, poly-aluminum chloride, laminar shear flow, image analysis

概要

To investigate the effect of shear force on the structural changes of flocs, the flocculation process of kaolinite-PACl was visualized in a laminar shear flow. The test equipment was a horizontal outer cylinder rotating Couette device, and the shear force in the gap of the double cylinder was controlled by the rotational speed. The trends in the representative diameter D90 of the flocs were organized as a function of the GT value (product of agitation intensity and time). As a result, a clear distinction was made in the high-speed rotation range between the floc growth stage and the breaking stage. Especially in the growth stage, D90∝GT0.5 was shown. This relationship can be explained by assuming a fractal structure in the conventional cohesive kinetic equation; D90 shifts in parallel while maintaining 0.5 power of the GT value, suggesting that floc fracture also occurs in the growth stage.

Abstract