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関連する概念動画

Surface Tension of Fluid01:22

Surface 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...
Irrotational Flow01:28

Irrotational Flow

Irrotational flow is characterized by fluid motion where particles do not rotate around their axes, resulting in zero vorticity. For a flow to be irrotational, the curl of the velocity field must be zero. This imposes specific conditions on velocity gradients. For instance, to maintain zero rotation about the z-axis, the gradient condition:
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

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.
Couette Flow01:22

Couette Flow

Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
Turbulent Flow01:24

Turbulent Flow

Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent spots,...
Boundary Layer Characteristics01:18

Boundary Layer Characteristics

When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...

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関連する実験動画

Updated: Jul 24, 2026

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
09:58

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

Published on: February 3, 2014

マイクロフリウイド混合のためのインターフェイス熱毛細血管渦巻きフロー.

Ramanathan Muruganathan1, Yi Zhang, Thomas M Fischer

  • 1Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida, USA.

Journal of the American Chemical Society
|March 16, 2006
PubMed
まとめ

私たちは,レーザー誘発のカビテーションバブルを使用して,低レイノルズ数で準二次元システムでの効率的な流体混合のための渦巻きフローを作成するための新しいマイクロ流体技術を開発しました.

科学分野:

  • 流体力学 流体力学
  • マイクロフリウジック
  • 表面科学とは,地表科学のことである.

背景:

  • 低レイノルズ数系には,特殊な混合技術が必要である.
  • 熱毛細管の流れは,表面張力グラデーションによって導かれる.
  • Langmuir モノレイヤーは,インターフェイス操作のためのプラットフォームを提供します.

研究 の 目的:

  • 準二次元システムにおける渦流の生成のための新しい方法を提示する.
  • 低レイノルズ数で効果的な微流体混合を達成するために.
  • 流体操作のためのレーザー誘発カビテーションの可能性を調査する.

主な方法:

  • IRレーザーを用いてラングミューア単層に二次元カビテーションバブルを誘導する.
  • レーザー誘発のカビテーションをマイクロ流体ポンプとして利用し,熱毛細血管の流れを生成します.
  • 渦巻きの流れを誘導するために単層の折りたたみを持つ熱毛細管の流れを混乱させる.
  • 生成されたトルクと渦巻力を分析するために,クリーピングフロー方程式を適用する.

主要な成果:

  • レーザーによって誘発されたカビテーションバブルは,周囲の液体を効果的にポンプし,指向された熱毛細管流を生み出します.

さらに関連する動画

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
07:32

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

Published on: April 10, 2017

Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
10:03

Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel

Published on: October 5, 2018

関連する実験動画

Last Updated: Jul 24, 2026

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
09:58

Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp

Published on: February 3, 2014

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
07:32

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

Published on: April 10, 2017

Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
10:03

Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel

Published on: October 5, 2018

  • 単層の折りたたみによる熱毛細血管の流れの乱れは渦巻きの流れを生成します.
  • 渦巻は,流体相をアジムタルに伸ばし,放射的に薄くする.
  • この方法は,効果的な2Dマイクロ流体混合の可能性を示しています.

    • 結論:

    • Langmuirモノレイヤーのレーザー誘発カビテーションは,渦巻きフローを生成するための有効な方法です.
    • この技術は,低レイノルズ数での効果的な二次元微流体混合のための有望な経路を提供します.
    • 更に研究すれば,渦の維持を最適化して,相互拡散と混合を向上させることができます.