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Related Concept Videos

General Characteristics of Pipe Flow I01:22

General Characteristics of Pipe Flow I

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Pipe flow refers to the movement of fluids within fully enclosed conduits, typically cylindrical in shape, such as water pipes or hydraulic hoses. These conduits are designed to withstand high-pressure gradients that drive fluid movement, contrasting with open-channel flows, where gravity is the primary driving force. Rectangular conduits, like air conditioning and heating ducts, generally operate at lower pressures and are less suited for high-pressure applications.
The classification of fluid...
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General Characteristics of Pipe Flow II01:24

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When fluid enters a pipe, it first passes through the entrance region, where the velocity profile adjusts due to viscous effects. In this region, a boundary layer forms along the pipe walls and grows until it fully occupies the pipe's cross-section. Once the boundary layer merges, the flow becomes fully developed, with a steady velocity profile that remains consistent along the pipe's length.
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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...
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Understanding fluid flow behavior through pipes is critical in fluid mechanics, especially in applications like oil transportation through pipelines. Hagen-Poiseuille's law provides an exact solution derived from the Navier-Stokes equations for steady, incompressible, and laminar flow within a circular pipe. Hagen-Poiseuille's law helps determine the necessary pressure drop across a pipeline section by determining parameters like pipe length, radius, oil viscosity, and the desired volumetric...
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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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In pipe flow analysis, problems are typically categorized into three types — Type I, Type II, and Type III — based on the known parameters and the desired outcome. Each type of problem addresses specific engineering requirements using fluid properties, pipe characteristics, and operational conditions.
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Helical inner-wall texture prevents jamming in granular pipe flows.

Felix Verbücheln1, Eric J R Parteli, Thorsten Pöschel

  • 1Institute for Multiscale Simulation, Friedrich-Alexander University of Erlangen-Nuremberg, Nägelsbachstraße 49b, 91052 Erlangen, Germany. thorsten.poeschel@fau.de.

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Adding a helical texture to pipes stabilizes granular material transport. This innovation prevents flow blockages and ensures consistent material flow without external energy input, improving industrial processes.

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Area of Science:

  • Physics
  • Engineering
  • Material Science

Background:

  • Granular pipe flows exhibit intermittent behavior and significant solid fraction variations.
  • These variations can lead to destructive events and flow disruptions like jamming.

Purpose of the Study:

  • To investigate the effect of helical pipe wall textures on granular flow stability.
  • To develop a predictive model for mass flux in helically textured pipes.

Main Methods:

  • Particle-based numerical simulations of gravity-driven granular flows in vertical pipes.
  • Analysis of mass flux and solid fraction variations under different helical texture parameters.

Main Results:

  • A helical pipe wall texture promotes steady material transport and homogeneous mass flux.
  • The helical texture significantly reduces density waves and the probability of flow jamming.
  • A modified Beverloo equation incorporating a helical texture parameter (B) accurately predicts granular mass flux.

Conclusions:

  • Helical pipe textures offer an effective, energy-efficient method to stabilize granular flows.
  • This approach can prevent jamming and improve the reliability of particulate transport systems.
  • The findings have broad applicability in industrial processes involving granular material handling.