超音波照射によるガラス板上の溜まり場中での微粒子の挙動

摘要

In the present study, a sound wave was transmitted into a geometric space through the glass plate, and a standing wave field was formed in it. When the solid particles were poured in the geometric space, they were trapped in the sound pressure nodes of the standing wave field. By changing the frequency, the geometric pattern of particles aggregation interestingly changed. A sound field was numerically simulated by FEM under the experimental conditions and the experimental results were discussed.%ガラス板上に作製した幾何学形状の溜まり場中に微粒子の懸濁液を入れ、ガラス板の端面に取り付けた圧電振動子から超音波を照射した。ガラス板中を振動が伝搬し、溜まり場中に超音波が放射され、定在波音場が形成され、粒子は幾何学模様に凝集した。周波数変化時の粒子凝集形状の挙動を観察したところ、非常に興味深い挙動を示した。実験による粒子凝集形状の観察、および有限要素法を用いた音圧分布のシミュレーションを示す。