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Steady Flow of a Fluid Stream01:27

Steady Flow of a Fluid Stream

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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...
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Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

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

Steady, Laminar Flow Between Parallel Plates

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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.
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Conservation of Mass in Finite Cotrol Volume01:16

Conservation of Mass in Finite Cotrol Volume

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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

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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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Updated: Dec 22, 2025

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels
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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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Flujo y control de líquidos sin paredes sólidas

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

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

Nature
|May 8, 2020
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron nuevos canales fluídicos líquido-en-líquido, evitando paredes sólidas para sistemas autocurativos y sin obstrucción. Este enfoque estabilizado por el campo magnético permite el transporte suave y eficiente de líquidos delicados como la sangre humana completa con menos daño celular.

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Área de la Ciencia:

  • Microfluidos
  • Dinámica de fluidos
  • Ciencias de los materiales

Sus antecedentes:

  • La miniaturización de los circuitos fluídicos se enfrenta a desafíos con paredes sólidas del canal, incluidas las limitaciones de la velocidad de flujo y la contaminación.
  • Los métodos existentes para mitigar las interacciones de la pared (por ejemplo, recubrimientos, electrohumedad) tienen limitaciones.
  • Los microfluidos de gotas y el flujo de la vaina evitan paredes sólidas pero requieren un flujo continuo de líquido.

Objetivo del estudio:

  • Desarrollar un nuevo sistema de canales fluídicos que elimine la necesidad de paredes sólidas.
  • Para crear canales microfluídicos que se curen por sí mismos, no se obstruyan y no se ensucien.
  • Demostrar un control preciso del flujo y un transporte suave de líquidos, especialmente para muestras biológicas delicadas.

Principales métodos:

  • Los canales de líquido acuoso están rodeados por un líquido magnético inmiscible.
  • Un campo magnético cuadrupolar estabiliza la interfaz líquido-en-líquido, creando canales fluídicos.
  • El bombeo magnetostáltico, utilizando imanes permanentes externos, controla el flujo de líquido sin contacto físico.

Principales resultados:

  • Los canales líquido-en-líquido exhiben propiedades de autocuración, no obstrucción y antiincrustantes.
  • El bombeo magnetostáltico permite una válvula eficaz, la división, la fusión y el bombeo de líquidos.
  • El transporte de sangre humana entera mostró una reducción de un orden de magnitud en la hemólisis en comparación con el bombeo peristáltico.

Conclusiones:

  • Este enfoque de líquido en líquido ofrece una alternativa superior a los canales microfluídicos tradicionales, especialmente para líquidos delicados.
  • El sistema permite un control preciso del flujo y un transporte suave a escala microscópica sin altas presiones.
  • Las aplicaciones potenciales incluyen circuitos microfluídicos avanzados y manejo mejorado de fluidos biológicos.