関連する実験動画
Updated: Jun 29, 2026
08:34
Visualization of High Speed Liquid Jet Impaction on a Moving Surface
Published on: April 17, 2015
まとめ
液滴の噴射ダイナミクスは,浅い液体の深さで大きく変化します. 5mm以下では,噴射されたクラウンが不安定になり,レイリージェットの高さとドロップ形成に影響を与えます. より深い液体は,より予測可能なスプラッシュ行動を示します.
科学分野:
- 流体力学 流体力学
- 液体の物理学 液体の物理
- ドロップインパクト現象
背景:
- 液滴の噴出の振る舞いは複雑である.
- 以前の研究では,スプラッシュダイナミクスを調査しましたが,しばしば深層の液体に焦点を当てています.
研究 の 目的:
- 浅い液体の深さがドロップスプラッシングのダイナミクスに及ぼす影響を調査するために.
- クラウンエジェクションの変化,レイリージェット特性,二次落下形成を定量化するために.
主な方法:
- 制御されたドロップを様々な深さの液体にスプレーする実験セットアップ.
- スプラッシュイベントを記録し,噴出されたクラウンとジェットを分析するための高速画像処理.
- レイリージェット高度と二次落下生産の定量的な測定.
主要な成果:
- 浅い液体の深さ (5mm未満) は,深い液体と比較して,より不安定な噴出冠につながる.
- 液体の深さが25mmから7mmに低下するにつれて,レイリージェットの高さと二次落下数が増加します.
- 7mm以下では,ジェット高度とドロップ数が急激に減少し,3mm以下では二次ドロップが形成されません.
結論:
- 液体の深さは,ドロップスプラッシングの結果を決定する重要なパラメータです.
- スプラッシュ行動の明確な移行は,浅い深さで発生し,ジェットの安定性とドロップレット生成に影響します.
- これらの深さに依存する効果を理解することは,液体インパクトを含むアプリケーションにとって極めて重要です.
関連する概念動画
01:07Cohesion
Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
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02:57Surface Tension, Capillary Action, and Viscosity
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01:13Excess Pressure Inside a Drop and a Bubble
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01:24Surface Tension
Surface tension is defined as the force per unit length (γ) acting along the surface of a liquid. It arises due to strong intermolecular forces of attraction. A molecule located inside the bulk of the liquid is surrounded by other molecules and experiences equal forces in all directions. However, a molecule at the surface experiences unbalanced forces because there are more neighboring molecules below than above. This creates a net inward force that pulls surface molecules toward the interior,...
01:22Surface Tension of Fluid
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...
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01:19Capillarity in Fluid
Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...