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KAKEN_17H04905seika.pdf
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粘弾性体キャビテーションの静的・動的力学特性を解像するプリセット型計測法の開発
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ネンダンセイタイ キャビテーション ノ セイテキ・ドウテキ リキガク トクセイ オ カイゾウスル プリセットガタ ケイソクホウ ノ カイハツ
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Nendanseitai kyabitēshon no seiteki dōteki rikigaku tokusei o kaizōsuru purisettogata keisokuhō no kaihatsu
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Experiment and Plesset-type analysis of cavitation bubble dynamics in viscoelastic materials
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安藤, 景太
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アンドウ, ケイタ
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Andō, Keita
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慶應義塾大学・理工学部 (矢上) ・准教授
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Research team head
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科研費研究者番号 : 30639018
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2020
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科学研究費補助金研究成果報告書
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2019
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粘弾性体におけるキャビテーション気泡の静的・動的力学特性を定量評価するための，実験・プリセット型球形気泡力学モデル連成による粘弾性計測法を開発した．パルスレーザ集束照射により生成した粘弾性ゼラチンゲル中の球形ガス気泡核のサイズを，溶存ガスの物質移動に基づき準静的に制御した．生成した気泡核を起点とするキャビテーション気泡の自由振動および超音波照射下の強制振動を高速度カメラで撮影し，気泡の動的応答に対する気泡核サイズの影響を実験的に取得した．気泡の静的・動的力学応答とプリセット型モデルの比較により，ゲル粘弾性の周波数応答を超広域に算定した上で，気泡の非線形力学おける粘弾性効果の定量評価を実現した．
A measurement technique in combination with theory and simulation was developed, which enables one to quantify statics and dynamics of cavitation bubbles in viscoelastic solids. Micron-sized bubble nuclei were produced by focusing laser pulses into a gelatin gel under dissolved-gas supersaturation and their size was controlled based on mass diffusion. Statics of these nuclei and ultrasound-induced dynamics of spherical cavitation bubbles were obtained from a series of visualization experiments with varying the nucleus size. Effects of viscoelasticity on nonlinear dynamics of spherical bubbles in the gel can be quantified, with comparison to nonlinear bubble dynamics model of Plesset type.
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研究種目 : 若手研究 (A)
研究期間 : 2017～2019
課題番号 : 17H04905
研究分野 : 熱流体工学
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