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Related Concept Videos

Bending of Material: Problem Solving01:09

Bending of Material: Problem Solving

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In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
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General Characteristics of Pipe Flow II01:24

General Characteristics of Pipe Flow II

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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.
The distance to reach a fully developed flow is called the entrance length and depends on the...
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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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Application of the Linear Momentum Equation01:15

Application of the Linear Momentum Equation

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The application of the linear momentum equation can be used to analyze the forces needed to hold a 180-degree pipe bend in place with flowing water. In this case, water flows through the bend with a constant cross-sectional area of 0.01 square meters and a flow velocity of 15 meters per second. The pressure at the entrance is 0.2 Megapascals and the pressure at the exit is 0.16 Megapascals.
The goal is to determine the force components in the x and y directions to hold the pipe in place. Since...
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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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Multiple Pipe Systems01:21

Multiple Pipe Systems

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Multipipe systems consist of complex configurations of interconnected pipes designed to transport fluids efficiently across intricate networks. They are essential in engineering applications requiring precise control over flow distribution, pressure, and head loss. They are categorized into series, parallel, loop, and network configurations, each distinguished by unique flow characteristics and applications.
Series Configuration
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Related Experiment Video

Updated: Mar 6, 2026

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
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Guided Wave Tomography of Pipe Bends.

Alex J Brath, Francesco Simonetti, Peter B Nagy

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |March 22, 2017
    PubMed
    Summary

    Guided Wave Tomography (GWT) effectively detects corrosion and erosion in pipe bends using ultrasonic waves. This method achieves 100% sensitivity for shallow defects, enabling reliable monitoring of pipeline integrity.

    Area of Science:

    • Engineering
    • Materials Science
    • Non-Destructive Testing

    Background:

    • Corrosion and erosion in pipe bends pose significant challenges for structural integrity monitoring.
    • Traditional methods struggle with the complex geometry and unpredictable defect locations in pipe bends.

    Purpose of the Study:

    • To experimentally demonstrate Guided Wave Tomography (GWT) for detecting and monitoring wall-thickness loss in pipe bends.
    • To evaluate the sensitivity and accuracy of GWT for various defect depths and locations.

    Main Methods:

    • Utilizing model-based inversion with guided ultrasonic waves propagating along pipe bends.
    • Implementing a novel curved ray tomography algorithm with an optimal transducer configuration (ring arrays and external line transducers).

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    Related Experiment Videos

    Last Updated: Mar 6, 2026

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    Main Results:

    • Achieved 100% sensitivity in detecting the presence and progression of localized corrosion defects, irrespective of their position.
    • Successfully detected defects as shallow as 0.50% of wall thickness (WT) and depth increments of 0.25% WT.
    • Observed underestimation of maximum defect depth by GWT compared to 3-D laser scans, with errors ranging from 3% to 8% WT.

    Conclusions:

    • GWT is a highly sensitive technique for detecting and monitoring damage in pipe bends.
    • The proposed GWT approach with optimal transducer configuration shows promise for pipeline integrity assessment.
    • Further refinement is needed to improve the accuracy of depth estimation for irregular corrosion defects.