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Related Concept Videos

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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Couette Flow01:22

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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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Newtonian Fluid: Problem Solving01:18

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Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
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Hydrodynamic slip can align thin nanoplatelets in shear flow.

Catherine Kamal1, Simon Gravelle1,2, Lorenzo Botto3,4

  • 1School of Engineering and Material Science, Queen Mary University of London, London, UK.

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|May 17, 2020
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Rigid nanoplatelets, like graphene, align with flow due to hydrodynamic slip, contradicting classical models. This discovery impacts nanomaterial processing and applications.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Nanotechnology

Background:

  • Large-scale processing of nanomaterials (e.g., graphene, MoS2) requires understanding their flow behavior in liquids.
  • Nanometrically-thin platelets exhibit unique hydrodynamic properties crucial for applications.

Purpose of the Study:

  • To investigate the orientation behavior of rigid nanoplatelets in liquid flows.
  • To reconcile simulation predictions with classical colloidal hydrodynamics.
  • To explore the role of hydrodynamic slip in nanoplatelet alignment.

Main Methods:

  • Combined non-equilibrium molecular dynamics and continuum simulations.
  • Analyzed the flow behavior of pure and surface-modified graphene nanoplatelets.
  • Investigated the influence of hydrodynamic slip at the liquid-solid interface.

Main Results:

  • Rigid nanoplatelets achieve a stable orientation under sufficiently strong flows.
  • Observed stable orientation contradicts classical colloidal hydrodynamics predictions.
  • Alignment occurs when slip length exceeds platelet thickness, even with nanometer-scale slip.

Conclusions:

  • Hydrodynamic slip is a critical factor in nanoplatelet orientation, deviating from traditional theories.
  • The findings are applicable to various solvent/2D material combinations.
  • Slip-dependent alignment affects macroscopic transport properties, with implications for functional inks and nanocomposites.