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関連する概念動画

Rise of Liquid in a Capillary Tube01:18

Rise of Liquid in a Capillary Tube

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When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
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Capillarity in Fluid01:19

Capillarity in Fluid

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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...
472
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

476
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
476
Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

30.6K
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

525
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
525
Hydrostatic Pressure Force on a Curved Surface01:04

Hydrostatic Pressure Force on a Curved Surface

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Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
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関連する実験動画

Updated: Oct 20, 2025

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
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三次元キャピラーラッチ誘導液体方向制御

Shile Feng1,2, Pingan Zhu1, Huanxi Zheng1

  • 1Department of Mechanical Engineering, City University of Hong Kong, Hong Kong SAR 999077, P. R. China.

Science (New York, N.Y.)
|September 16, 2021
PubMed
まとめ

研究者らは3Dキャピラーラチェットで 液体の拡散方向を制御し,自己推進を実現することを実証しました この突破は,表面の相互作用における2Dの制限を克服することによって, 液体輸送能力を向上させます.

さらに関連する動画

Capillary-based Centrifugal Microfluidic Device for Size-controllable Formation of Monodisperse Microdroplets
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Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
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Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure

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関連する実験動画

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Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
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Capillary-based Centrifugal Microfluidic Device for Size-controllable Formation of Monodisperse Microdroplets
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Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
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科学分野:

  • 複合流体物理学
  • 表面科学とインターフェイス現象
  • 微流体とナノテクノロジー

背景:

  • 従来の理解では 液体は表面エネルギーを最小限に抑え,主に表面特性によって支配されます.
  • 液体と固体の相互作用が主に二次元であるため,方向性のある液体方向を制御することは困難です.
  • 表面張力のような液体の性質は,伝統的なモデルで拡散方向を決定する際にしばしば二次的である.

研究 の 目的:

  • 三次元 (3D) カピラーラッチの方向性流体方向化の可能性を調査する.
  • 3Dキャピラーラッチを使用する際に,液体の表面張りの拡散ダイナミクスの影響を調査する.
  • 液体の制御された方向移動と自己推進を実現し,輸送を強化します.

主な方法:

  • 不対称な表面形状を持つ3Dキャピラーラッチの設計と製造
  • 設計された3D構造に,異なる表面張りの液体の沈殿.
  • 表面平面の中と外の両方から得られた3D拡散プロフィールの分析.

主要な成果:

  • 3Dキャピラーラッチを使用して,液体の拡散方向を成功裏に調整しました.
  • 3Dラチェットが不対称な広がりプロフィールを作り,方向的な動きに影響を与えることを観察しました.
  • この方向制御は 自動推進と 高速流動と相まって 確認できました

結論:

  • 三次元キャピラーラッチは 液体の拡散方向を制御する 新しい方法を提供します
  • 3Dデザインは2Dインタラクションの限界を克服し,表面エネルギー最小化のみから独立した精密なステアリングを可能にします.
  • 観察された自己推進と高流速は,高度な液体輸送アプリケーションのためのこの方法の実用性を強調します.