Papers - Fujioka, Satoko

Unique properties of fine bubbles in the electrochemical reduction of carbon dioxide using boron-doped diamond electrodes

Mai Tomisaki, Keisuke Natsui, Satoko Fujioka, Koichi Terasaka, Yasuaki Einaga

Electrochimica Acta 389 ( 1 ) 138769 2021.06

Research paper (scientific journal), Joint Work, Accepted

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Characterization of Water/Organic Biphasic System in Liquid-Liquid Slug Flow under Hydrothermal Conditions: Solvation, Vorticity and Hydrophobicity

Toshinori Shimanouchi, Satoko Fujioka, Tatsuya Tanifuji, Kenta Yamamoto, Koichi Terasaka, Yukitaka Kimura

Solvent Extraction Research and Development Japan 28 ( 1 ) 21 - 35 2021.06

Research paper (scientific journal), Joint Work, Accepted

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ウルトラファインバブル水の国際輸送

田中俊也, 成瀬祐里, 寺坂宏一, 藤岡沙都子, 山本陽子, 野口雄介, 山崎京香, 庄村拓也, 原田駿

混相流 35 ( 1 ) 185 - 196 2021.02

Research paper (scientific journal), Joint Work, Accepted

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Experimental study and prediction by computational fluid dynamics on self-induced sloshing due to bubble flow in a rectangular vessel

Ryohei Aoki, Satoko Fujioka, Koichi Terasaka

Journal of Chemical Engineering of Japan (The Society of Chemical Engineers, Japan)  54 ( 2 ) 51 - 57 2021.02

Research paper (scientific journal), Joint Work, Accepted,  ISSN  00219592

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Self-induced sloshing is an oscillatory phenomenon of a free liquid surface due to the flow of a fluid. This phenomenon has been reported in some gas–liquid reactors, and it is important to predict and prevent its occurrence for the safe operation of the reactors. However, the fundamental knowledge on the self-induced sloshing by bubble flow, such as the frequency and amplitude, is insufficient, and the occurrence condition has not been clarified. The purpose of this study is to investigate the characteristics of self-induced sloshing by bubble flow experimentally. We attempt to reproduce self-induced sloshing by using computational fluid dynamics (CFD) and establish a CFD model for the prediction of the occurrence of self-induced sloshing. In the experiments, air bubbles were dispersed into a liquid from the bottom of a rectangular vessel. The effects of the air flow rate and static liquid height on the characteristics of self-induced sloshing were investigated experimentally by image analysis. The occurrence of self-induced sloshing was confirmed by increasing the airflow rate at a specific static liquid height. The amplitude reached a maximum at the static liquid height, where self-induced sloshing was most likely to occur, and the frequency decreased with increasing static liquid height. Next, in order to reproduce the self-induced sloshing through CFD, an appropriate drag model of the bubbles was selected. Although the amplitude was overestimated due to the absence of the foam layer, the predicted frequency agreed well with the experimental value. Finally, the movement of the circulation flow was analyzed, and its correlation with the self-induced sloshing was clarified.

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Generation and Long-term Stability of Ultrafine Bubbles in Water

Shunya Tanaka, Koichi Terasaka, Satoko Fujioka

Chemie Ingenieur Technik (Wiley)  93 ( 1-2 ) 168 - 179 2020.12

Research paper (scientific journal), Joint Work, Accepted,  ISSN  1522-2640

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Dissolution and Shrinking of a Single Microbubble in Stationary Liquid with Surfactants

Satoko Fujioka, Kanako Mizuno, Koichi Terasaka

Chemie Ingenieur Technik (Wiley)  93 ( 1-2 ) 216 - 222 2020.11

Research paper (scientific journal), Joint Work, Accepted,  ISSN  1522-2640

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For a variety of applications of microbubbles, it is necessary to clarify the dissolution dynamics and the lifetime of a microbubble. Although various models have been proposed, predicting the dissolution rate of a microbubble in a static fluid with a surfactant is still difficult. In this study, dissolution behavior was predicted with taking into account the mass transfer inhibition effect due to a surfactant at the bubble surface. The shrinking behavior of an oxygen microbubble was observed with several surfactants and the experimental results were in good agreement with model predictions.

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Concentration and Dilution of Ultrafine Bubbles in Water

Shunya Tanaka, Yuri Naruse, Koichi Terasaka, Satoko Fujioka

Colloids and Interfaces (MDPI)  4 ( 4 ) 50 2020.11

Research paper (scientific journal), Joint Work, Accepted,  ISSN  2504-5377

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加減圧の繰り返し操作による水中からのウルトラファインバブル生成

山崎京香,　寺坂宏一,　藤岡沙都子

混相流 34 ( 4 ) 532 - 540 2020.10

Research paper (scientific journal), Joint Work, Accepted,  ISSN  1881-5790

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Destabilization of ultrafine bubbles in water using indirect ultrasonic irradiation

Shunya Tanaka, Hirona Kobayashi, Seika Ohuchi,　Koichi Terasaka, Satoko Fujioka

Ultrasonics Sonochemistry (Elsevier)  71   105366 2020.10

Research paper (scientific journal), Joint Work, Accepted,  ISSN  1350-4177

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加圧容器からのスプレー噴射による酸素ウルトラファインバブル水の製造

山崎京香,　寺坂宏一,　藤岡沙都子

混相流 34 ( 3 ) 436 - 443 2020.07

Research paper (scientific journal), Accepted,  ISSN  1522-2640

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Synthesis, kinetic study, and reaction mechanism of Li₄SiO₄ with CO₂ in a slurry bubble column reactor

Yugo Kanai, Koichi Terasaka, Satoko Fujioka

Chemical Engineering Communications (Taylor&Francis)  207 ( 5 ) 598 - 611 2019.05

Research paper (scientific journal), Joint Work, Accepted,  ISSN  00986445

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Mass transfer from freely rising microbubbles in aqueous solutions of surfactant or salt

Shunya Tanaka, Sven Kastens, Satoko Fujioka, Michael Schlüter M, Koichi Terasaka

Chemical Engineering Journal (Elsevier)  387 ( 1 ) 121246 2019.03

Research paper (scientific journal), Joint Work, Accepted,  ISSN  13858947

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Absorption of carbon dioxide at high temperature with molten alkali carbonate using bubble column reactor

Yugo Kanai, Koichi Terasaka, Satoko Fujioka, Kenichiro Fukunaga

Journal of Chemical Engineering of Japan (The Society of Chemical Engineers, Japan)  52 ( 1 ) 31 - 40 2019.01

Research paper (scientific journal), Joint Work, Accepted,  ISSN  00219592

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水平摺動するノズルからの微細気泡生成

村上大地郎, 寺坂宏一, 藤岡沙都子

混相流 31 ( 4 ) 422 - 426 2017.12

Research paper (scientific journal), Joint Work, Accepted

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水中を収縮しつつ浮上する単一マイクロバブルからの物質移動

岩切扶樹，寺坂宏一，藤岡沙都子, M. Schlueter, S. Kastens and 田中俊也

混相流 30 ( 5 ) 529 - 535 2017.03

Research paper (scientific journal), Joint Work, Accepted

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The Establishment of Experimental Method to Observe Bubble Formation in High Temperature Molten Salt System and Estimation of Generated Bubble Size

Yugo Kanai, Koichi Terasaka, Satoko Fujioka and Kazumi Suzukawa

Journal of Chemical Engineering of Japan 50 ( 2 ) 86 - 93 2017.02

Research paper (scientific journal), Joint Work, Accepted

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CFDシミュレーションを用いた屈曲流路から成る乳化用スタティックミキサーの開発

藤岡沙都子

Fooma技術ジャーナル 11 ( 2 ) 31 - 35 2017.02

Research paper (scientific journal), Single Work, Accepted

Estimation of total oxygen transfer into aeration tank

Kazue Shibata, Koichi Terasaka, Satoko Fujioka, Kaoru Kato

Journal of Chemical Engineering of Japan 49 ( 7 ) 588 - 594 2016.07

Joint Work, Accepted

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Oxygen transfer from a free surface and dispersed bubbles in an aeration tank

Kazue Shibata, Koichi Terasaka, Satoko Fujioka, Kaoru Kato

Journal of Chemical Engineering of Japan 49 ( 5 ) 391 - 398 2016.05

Research paper (scientific journal), Joint Work, Accepted

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Chemical Conversion and Liquid-Liquid Extraction of 5-Hydroxymethylfurfural from Fructose by Slug Flow Microreactor

Toshinori Shimanouchi, Yoshitaka Kataoka, Tatsuya Tanifuji, Yukitaka Kimura,FUJIOKA Satoko, Koichi Terasaka

AIChE Journal 62 ( 6 ) 2135 - 2143 2016.02

Research paper (scientific journal), Joint Work, Accepted

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Water / Methyl isobutyl ketone (MIBK) Biphasic System in Slug Flow under High Temperature and Pressure Conditions

Toshinori Shimanouchi, Satoko Fujioka, Tatsuya Tanifuji, Kenta Yamamoto, Koichi Terasaka, Yukitaka Kimura

Solvent Extraction Research and Development Japan 21 ( 2 ) 201 - 209 2014.05

Research paper (scientific journal), Joint Work, Accepted

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Oxygen Transfer into Xanthan Solutions in Partitioned Bubble Columns

Koichi Terasaka, Junya Nitta, Hisashi Fukuda, Misa Iwahashi, Takashi Goshima, Satoko Fujioka

Journal of Chemical Engineering of Japan 46 ( 1 ) 33 - 39 2013.01

Research paper (scientific journal), Joint Work, Accepted

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Mass Transfer in Molten Salt and Suspended Molten Salt in Bubble Column

Yugo Kanai, Kenichiro Fukunaga, Koichi Terasaka and Ssatoko Fujioka

Chemical Engineering Science 100   153-159 2012.12

Research paper (scientific journal), Joint Work, Accepted

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Development of Slurry Bubble Column with Lithium Silicate to Recover Hot CO₂ Gas from Flue Gas

Yugo Kanai, Koichi Terasaka, Masato Suwabe, Satoko Fujioka, Daisuke Kobayashi

Journal of Chemical Engineering of Japan 45 ( 9 ) 645 - 650 2012.09

Research paper (scientific journal), Joint Work, Accepted

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Gas and Liquid Two-phase Flow Injected Directly into Vertical Mini-channel

Takashi Goshima, Koichi Terasaka, Satoko Fujioka

Journal of Chemical Engineering of Japan 45 ( 9 ) 696 - 702 2012.09

Research paper (scientific journal), Joint Work, Accepted

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Development of Multislit Submilli-Bubble Distributor for Gas Absorption

Satoko Fujioka, Kumi Kaneko, Koichi Terasaka, Yoshihito Sasada, Takashi Goshima, Daisuke Kobayashi

Journal of Chemical Engineering of Japan 45 ( 9 ) 691 - 695 2012.09

Research paper (scientific journal), Joint Work, Accepted

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液相への溶解効率の高い直径1 mm以下の微細気泡,すなわちサブミリバブルを分散させるためのガス分散器を開発した.著者らにより過去に提案されたスリット型オリフィスを採用し,多量の気泡を分散させるため複数のスリット型オリフィスを有するマルチスリット型のサブミリバブル分散器を開発した.この分散器について,ガスホールドアップおよび物質移動容量係数を測定し,従来型のガス分散器よりも高いガス溶解効率が得られることを確かめた.

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Submilli-bubble Dispersion from a Slit Orifice into Water

Koichi Terasaka, Yoshihito Sasada, Daisuke Kobayashi, Satoko Fujioka

Journal of Chemical Engineering of Japan 44 ( 3 ) 140 - 145 2011.03

Research paper (scientific journal), Joint Work, Accepted

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Co-doped Y₂O₃:Tb³⁺/Tm³⁺ Multicolor Emitting Phosphors for Thermometry

Naohiro Ishiwada, Satoko Fujioka, Toshihisa Ueda, Takeshi Yokomori

Optics Letters 36 ( 5 ) 760 - 762 2011.03

Research paper (scientific journal), Joint Work, Accepted

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Development of Microbubble Aerator for Waste water Treatment Using Aerobic Activated Sludge

Koichi Terasaka, Ai Hirabayashi, Takanori Nishino, Satoko Fujioka, Daisuke Kobayashi

Chemical Engineering Science 66 ( 14 ) 3172 - 3179 2011.02

Research paper (scientific journal), Joint Work, Accepted

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活性汚泥を利用した廃水処理プロセスでは,微生物への効率的な酸素供給が必要不可欠である.本研究では旋回液流式のマイクロバブル発生器を利用したエアリフト型マイクロバブル曝気装置を開発した.本装置はコンパクトで可動式であり,酸素溶解性能が高いという利点を持つ.廃水処理性能の評価のため,モデル有機廃水を用いて曝気速度,溶存酸素濃度および装置形状が有機物分解速度に与える影響について検討した.

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ノンエレメントミキサーの対流混合促進過程

兪 善昊, 樋口 尚孝, 藤岡 沙都子, 植田 利久

化学工学論文集 35 ( 6 ) 589 - 595 2009.11

Research paper (scientific journal), Joint Work, Accepted

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乱流状態を用いずに高粘度液体の高効率な混合を行うため,内部に機械的駆動部やエレメントを持たず,複数の支流から周期的に流体を押し出すことにより流体の引き伸ばしと折り畳みを行わせるノンエレメントミキサーを開発した.その混合特性を明らかにするため,レーザ誘起蛍光法により主流管中心軸上の断面を可視化し,引き伸ばし・折り畳みの過程について検討を加え,支流本数および押し出し周期が混合促進に与える影響を明らかにした.

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発熱反応を伴う液体流動場における振動パターンの構造解析

藤岡沙都子

 2009.03

Doctoral thesis, Single Work

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発熱反応を伴う剪断流動場において反応による局所的な物性の変化により二流体の境界付近で生じる振動現象について解析した.流動パターンの可視化実験を行い装置形状,操作条件および流体物性が流れの振動パターンに及ぼす影響について検討し,フラクタル次元を用いて振動パターンの複雑性を定量化した.また,熱移動の振動による温度変動パターンについても同様にフラクタル次元を用いた複雑性の定量化を行った.さらに,振動発生機構についてペトリネットによるモデル化とシミュレーションを行った.

発熱反応を伴う流動場における不安定現象解析への構成論的アプローチ

藤岡沙都子, 松本秀行, 黒田千秋

化学工学論文集 34 ( 1 ) 130 - 135 2008.01

Research paper (scientific journal), Joint Work, Accepted

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発熱反応を伴う剪断流動場で発生する不安定振動現象について,粘性が流動パターンに与える影響を検討した.上流での振動発生機構についてはペトリネットを用いたモデル化とシミュレーションにより粘性の増加が振動の周波数に与える影響を明らかにした.一方,流動パターンが複雑に変化する下流ではフラクタル解析を用いたパターンの複雑性の定量化を行い,粘性が重要な支配因子であることを明らかにした.

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プロセス強化を目指した現象論的モデリングとシミュレーション

黒田千秋, 松本秀行, 藤岡沙都子

化学工学論文集 34 ( 1 ) 1 - 7 2008.01

Research paper (scientific journal), Joint Work, Accepted

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期待するプロセス強化(PI)とその実現のための方法論について独自の見解を述べることを目的とした.PIにとってプロセスシステムの組織的な統合化,即ちコンパクト化が重要であり,その結果精密要素が緻密に詰まった複雑なシステムにおける精密で効率的かつ柔軟なダイナミック複雑系のマルチスケールのモデリング・シミュレーションの必要性を明らかにした.

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Pattern Analysis of Viscous Oscillation in a Shear Flow Induced by an Exothermic Reaction

Satoko Fujioka, Hideyuki Matsumoto, Chiaki Kuroda

Fluid Dynamics Research 40 ( 3 ) 163 - 174 2007.06

Research paper (scientific journal), Joint Work, Accepted

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剪断流動場において発熱反応により発生する振動現象について,可視化実験をもとに形成される流動パターンについて検討した.上流側で観察される規則的な振動パターンが下流側では複雑に変化することを明らかにし,フラクタル解析を用いて粘度比,全体粘度,流量比及び全流量の影響について検討した.さらに温度変動データについて時系列のフラクタル解析を行い,全体粘度が流動及び温度両方の振動パターン制御に重要な因子であることを示した.

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