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関連する概念動画

Steady Flow of a Fluid Stream01:27

Steady Flow of a Fluid Stream

601
Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
601
Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

857
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 purely axial,...
857
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

703
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.
703
Conservation of Mass in Finite Cotrol Volume01:16

Conservation of Mass in Finite Cotrol Volume

1.7K
The principle of conservation of mass is a fundamental law in fluid mechanics and is applied using the continuity equation. We apply the concept to a finite control volume to derive the continuity equation.
A system is defined as a collection of unchanging contents, and the conservation of mass states that a system's mass is constant.
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Conservation of Mass in Fixed, Nondeforming Control Volume01:07

Conservation of Mass in Fixed, Nondeforming Control Volume

1.5K
The principle of conservation of mass is fundamental in fluid dynamics and is crucial for analyzing flow within fixed control volumes, such as pipes or ducts. This principle states that the total mass within a control volume remains constant unless altered by the inflow or outflow of mass through the control surfaces. This results in a vital relationship for steady, incompressible flow where the mass entering a system equals the mass leaving it.
In the case of a sewer pipe, which can be modeled...
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Laminar and Turbulent Flow01:07

Laminar and Turbulent Flow

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Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
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Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels
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固体壁のない液体の流れと制御

Peter Dunne1,2, Takuji Adachi1,3, Arvind Arun Dev2

  • 1Université de Strasbourg, CNRS, ISIS, Strasbourg, France.

Nature
|May 8, 2020
PubMed
まとめ
この要約は機械生成です。

研究者らは新型の液体内流体チャネルを開発し 固体壁を避け 自動治癒型で閉塞しないシステムを開発しました 磁場による安定化により 繊細な液体を 優しく効率的に運ぶことができます

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Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels
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科学分野:

  • マイクロ流体
  • 流体力学
  • 材料科学

背景:

  • 流体回路を小型化すると,流量制限や汚れを含む固いチャネル壁の課題に直面します.
  • 壁の相互作用を軽減する既存の方法 (例えば,コーティング,電湿) には限界があります.
  • ドロップレット微流体とシートフローは固体壁を避けますが,連続した液体の流れが必要です.

研究 の 目的:

  • 固体壁の必要性を排除する 新しい流体チャネルシステムを開発する
  • 自己治癒性で 塞がらない マイクロフリウイドチャネルを作ります
  • 特に繊細な生物学的サンプルに対して,精密な流量制御と穏やかな液体輸送を証明する.

主な方法:

  • 水性液体チャネルは 混じらない磁気液体で囲まれています
  • 四極磁場は液体内の液体界面を安定させ 流動的なチャネルを作り出します
  • 外部永久磁石を使用した磁気静止ポンプは,物理的な接触なしに液体の流れを制御します.

主要な成果:

  • 液体内の液体チャネルは,自己治癒,非詰まり,および防腐性を持っています.
  • マグネトスタルティックポンプは,効率的なバルブ,分割,合併,および液体のポンプを可能にします.
  • 全身の血液の輸送は,周回抽出と比較して,血解の大きさの減少を示した.

結論:

  • この液体内の液体のアプローチは,特に繊細な液体の場合は,従来の微流体チャネルに優れた代替手段を提供します.
  • このシステムは,高圧なしに微小規模で精密な流れ制御と穏やかな輸送を可能にします.
  • 潜在的応用には,高度なマイクロ流体回路と,生物学的流体処理の改善が含まれます.