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Laminar Flow: Problem Solving01:24

Laminar Flow: Problem Solving

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Laminar flow occurs when a fluid moves smoothly in parallel layers with minimal mixing and turbulence. In fluid mechanics, ensuring laminar flow within a pipe is essential for precise control of flow characteristics, especially in engineering applications. The key factor in determining whether flow remains laminar is the Reynolds number, a dimensionless quantity that depends on the fluid's velocity, density, viscosity, and the pipe's diameter. A Reynolds number of 2100 or lower...
491
Uniform Depth Channel Flow: Problem Solving01:18

Uniform Depth Channel Flow: Problem Solving

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To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
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Turbulent Flow: Problem Solving01:09

Turbulent Flow: Problem Solving

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Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures enhance...
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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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Turbulent Flow01:24

Turbulent Flow

656
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...
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Related Experiment Video

Updated: Jan 12, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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Facilitating a 3D Granular Flow with an Obstruction.

Abhijit Sinha1, Jackson Diodati2, Narayanan Menon2

  • 1Tata Institute of Fundamental Research, Department of Condensed Matter Physics and Materials Science, Homi Bhabha Road, Mumbai 400-005, India.

Physical Review Letters
|November 7, 2025
PubMed
Summary
This summary is machine-generated.

Placing an obstacle near an outlet prevents clogging in 3D granular flow. This counterintuitive method uses geometry to destabilize clog formation, ensuring smoother particle processing.

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Area of Science:

  • Physics
  • Engineering
  • Materials Science

Background:

  • Powder and grain processing requires consistent particle flow from outlets.
  • Unpredictable clogging events disrupt industrial processes and reduce efficiency.

Purpose of the Study:

  • To investigate the effectiveness of obstacles in suppressing clog formation in 3D granular flow.
  • To elucidate the underlying mechanism responsible for clog suppression.

Main Methods:

  • Experimental studies of granular flow with varying obstacle shapes and positions.
  • Computer simulations to model granular dynamics and clog formation.

Main Results:

  • An obstacle placed near the outlet significantly suppresses clog formation in 3D granular flow.
  • Optimal obstacle placement follows a geometric rule, destabilizing the most probable clog-forming arch.
  • The effect is potent even with small obstacles, comparable to single grain size.

Conclusions:

  • Geometric placement of obstacles is an effective strategy to prevent granular flow clogging.
  • This principle offers a generalizable solution for various particulate and agent-based systems.
  • The findings have implications for optimizing industrial powder and grain processing.