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Related Concept Videos

General Characteristics of Pipe Flow II01:24

General Characteristics of Pipe Flow II

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.
The distance to reach a fully developed flow is called the entrance length and depends on the flow...
General Characteristics of Pipe Flow I01:22

General Characteristics of Pipe Flow I

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...
Single Pipe Systems01:24

Single Pipe Systems

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.
In a Type I problem, fluid properties (density and viscosity), pipe characteristics (including diameter, length, and surface roughness), and the flow rate or average velocity are known. The...
Laminar Flow01:27

Laminar Flow

Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
Turbulent Flow01:24

Turbulent Flow

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 spots,...
Laminar Flow: Problem Solving01:24

Laminar Flow: Problem Solving

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 indicates...

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Related Experiment Video

Updated: Jul 5, 2026

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow
08:25

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow

Published on: April 30, 2018

Experimental and theoretical progress in pipe flow transition.

A P Willis1, J Peixinho, R R Kerswell

  • 1School of Mathematics, University of Bristol, Bristol BS8 1TW, UK.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|May 20, 2008
PubMed
Summary

Researchers have advanced understanding of pipe flow turbulence. New findings clarify disturbance thresholds for laminar-to-turbulent transition and turbulence decay, with experimental and numerical agreement.

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Related Experiment Videos

Last Updated: Jul 5, 2026

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow
08:25

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow

Published on: April 30, 2018

Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods
09:17

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Published on: April 23, 2018

The Diffusion of Passive Tracers in Laminar Shear Flow
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The Diffusion of Passive Tracers in Laminar Shear Flow

Published on: May 1, 2018

Area of Science:

  • Fluid dynamics
  • Turbulence research
  • Hydrodynamics

Background:

  • Osborne Reynolds' 1883 experiments laid the foundation for pipe flow turbulence research.
  • The stability of Hagen-Poiseuille flow remains a central problem in fluid dynamics.
  • Despite extensive study, key aspects of pipe flow transition are still under investigation.

Purpose of the Study:

  • To review recent experimental and numerical findings on pipe flow stability.
  • To elucidate the critical disturbance amplitude for turbulence transition.
  • To define the turbulence decay threshold and explore traveling wave solutions.

Main Methods:

  • Experimental investigations of fluid flow in pipes.
  • Numerical simulations of turbulent and laminar flow regimes.
  • Analysis of disturbance amplitudes and Reynolds numbers.

Main Results:

  • Quantitative agreement between experimental and numerical data on turbulence decay thresholds.
  • Identification of threshold amplitudes for triggering turbulence from laminar flow.
  • Insights into the role of unstable traveling wave solutions in pipe flow.

Conclusions:

  • Significant progress has been made in understanding pipe flow turbulence.
  • Experimental and numerical methods provide consistent results for flow stability.
  • Traveling wave solutions offer new perspectives on transitional and turbulent pipe flow.