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KAKEN_25820389seika.pdf
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マイクロバブルの溶解・収縮を利用した結晶核生成機構の解明
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マイクロバブル ノ ヨウカイ・シュウシュク オ リヨウシタ ケッショウカク セイセイ キコウ ノ カイメイ
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Maikurobaburu no yokai shushuku o riyoshita kesshokaku seisei kiko no kaimei
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Elucidation of formation mechanism of crystal nucleus by using dissolution and shrinkage of a microbubble
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藤岡, 沙都子
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フジオカ, サトコ
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Fujioka, Satoko
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慶應義塾大学・理工学部・専任講師
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Research team head
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科研費研究者番号 : 50571361
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2015
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科学研究費補助金研究成果報告書
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2014
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静止流体中におけるマイクロバブル(以下μB)の溶解・収縮挙動に関する詳細な知見を得るため, 液-気-液3相合流型のマイクロチャネルを用いた観察を行った。気液流量変化による流動様式の変化を観察し, μBが生成する条件を明らかにした。次に液相に酸素呈色試薬を添加し溶存酸素濃度場の可視化を行い, μBの急激な溶解・収縮により溶存気体高濃度場が形成されることを明らかにした。また操作条件がμB溶解・収縮に及ぼす影響を調べ, マイクロチャネル内圧力の増加および初期液相溶存酸素濃度の減少がμBの急激な溶解・収縮を促進させることを明らかにした。さらにμB溶解・収縮挙動モデルを検討し, 実測値と計算値に良好な一致を得た。
Gas-liquid flow was investigated in flow-focusing type microchannel to study dissolution and shrinkage of microbubbles in detail. A flow pattern map was proposed by varying flow rates of gas and liquid. Condition for stable formation of microbubbles was elucidated. Distribution of dissolved gas was visualized by using the oxygen-sensitive dye. It was confirmed that locally high dissolved gas concentration area was formed around a microbubble by fast dissolution and shrinkage of the microbubble. Moreover, the effects of operational conditions on dissolution and shrinkage rate were investigated. Increase in pressure and/or decrease in initial dissolved gas concentration enhanced fast dissolution of microbubbles. Finally, a mathematical model was considered to estimate the time course of diameter of dissolving and shrinking microbubble. Calculation results from this model showed good agreement with measured values.
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研究種目 : 若手研究(B)
研究期間 : 2013~2014
課題番号 : 25820389
研究分野 : 化学工学
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