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Related Concept Videos

Couette Flow01:22

Couette Flow

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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...
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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...
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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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Poiseuille's Law and Reynolds Number01:10

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Any fluid in a horizontal tube can flow due to pressure differences—fluid flows from high to low pressure. The flow rate (Q) is the ratio of pressure difference and resistance through a horizontal tube. The greater the pressure difference, the higher the flow rate. The flow resistance is expressed as:
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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.
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Bernoulli's Equation for Flow Along a Streamline01:30

Bernoulli's Equation for Flow Along a Streamline

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Bernoulli's equation relates the energy conservation in a fluid moving along a streamline. The equation applies to incompressible and inviscid fluids under steady flow. For such a flow, Newton's second law is applied to a small fluid element, which experiences forces due to pressure differences, gravity, and velocity variations. The force balance leads to the following form of Bernoulli's equation:
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Related Experiment Video

Updated: Jul 17, 2025

Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature
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Advancing optothermal manipulation: decoupling temperature and flow fields in quasi-isothermal microscale streaming.

Youngsun Kim1, Yuebing Zheng2,3

  • 1Materials Science and Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712, USA.

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|August 31, 2023
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Summary

ISO-FLUCS technology precisely controls microscale fluid streaming by decoupling temperature and flow fields. This innovation minimizes thermal damage for advanced optofluidic applications.

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Area of Science:

  • Optofluidics
  • Microfluidics
  • Laser-based manipulation

Background:

  • Precise control of microscale fluid dynamics is crucial for many scientific and technological applications.
  • Thermal effects can significantly complicate fluid manipulation and potentially damage sensitive samples in microfluidic devices.

Purpose of the Study:

  • To introduce and validate a novel technique, ISO-FLUCS, for achieving quasi-isothermal optofluidic microscale streaming.
  • To demonstrate precise fluid manipulation capabilities while mitigating thermal damage.

Main Methods:

  • Utilized symmetry-correlated laser scan sequences to decouple temperature and flow fields.
  • Developed and applied the ISO-FLUCS (Isothermal Optofluidic Streaming) technique.

Main Results:

  • Achieved quasi-isothermal conditions in optofluidic microscale streaming.
  • Demonstrated precise control over fluid manipulation.
  • Successfully minimized thermal damage to the fluid and surrounding microenvironment.

Conclusions:

  • ISO-FLUCS provides a robust method for advanced optofluidic applications requiring precise, low-thermal-damage fluid control.
  • The technique advances the capabilities of microscale fluid manipulation in scientific research.