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Related Concept Videos

Pipe Flowrate Measurement01:28

Pipe Flowrate Measurement

In pipe flow measurement, orifice, nozzle, and Venturi meters are commonly used to determine fluid flowrates by constricting the flow area, which increases fluid velocity and reduces pressure. This pressure difference, governed by Bernoulli's principle and adjusted for real-world conditions, is essential for calculating flowrate. Each meter type is suited to specific applications based on accuracy, efficiency, and compatibility with various flow conditions.
The orifice meter is a simple,...
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Pipe Flowrate Measurement: Problem Solving

A spray tank system is engineered to uniformly distribute a pest-control liquid across plants by using a pressurized mechanism. The tank, pressurized to 150 kPa, holds the pesticide at a height of 0.80 meters. Liquid flows from the tank through a 1.9 meter pipe with a diameter of 0.015 meters, angled at 0.698 radians, ultimately reaching a 0.007 meter nozzle that sprays the pesticide. Accurate calculation of the system's flow rate is crucial to ensure uniform application, and this is achieved...
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...

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Related Experiment Video

Updated: Jun 17, 2026

Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole
09:37

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Published on: August 26, 2019

Post-processing of guided wave array data for high resolution pipe inspection.

Alexander Velichko1, Paul D Wilcox

  • 1Department of Mechanical Engineering, University of Bristol, Bristol BS8 1TR, United Kingdom. a.velichko@bristol.ac.uk

The Journal of the Acoustical Society of America
|December 17, 2009
PubMed
Summary
This summary is machine-generated.

This study presents a guided wave imaging method for pipe inspection. The total focusing method successfully detected a 2-mm hole in a steel pipe, demonstrating its effectiveness for structural health monitoring.

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Area of Science:

  • Non-destructive testing
  • Ultrasonic testing
  • Guided wave testing

Background:

  • Guided wave testing utilizes transducer arrays to inspect structures like pipes.
  • Raw data includes complex time-domain signals from transmitter-receiver pairs.
  • Focusing techniques are crucial for accurate signal interpretation and defect localization.

Purpose of the Study:

  • To describe a data processing method for guided wave transducer arrays on pipes.
  • To apply and evaluate the total focusing method for pipe inspection.
  • To assess the impact of array configurations on noise sensitivity and detection capabilities.

Main Methods:

  • Processing of full matrix time-domain signals from guided wave transducer arrays.
  • Application of the total focusing method for simultaneous transmission and reception focusing.
  • Analysis of array configuration effects on sensitivity to random and coherent noise.
  • Experimental validation using electromagnetic acoustic transducers (EMATs) and S(0) Lamb waves.

Main Results:

  • The total focusing method was successfully applied to specific array configurations.
  • The proposed method demonstrated robustness against noise, depending on array parameters.
  • Experimental results confirmed the detection of a 2-mm diameter half-thickness hole in a 12-in. steel pipe.
  • The detected flaw size was 0.08 wavelengths, highlighting the method's resolution.

Conclusions:

  • The described data processing method, utilizing the total focusing method, enables effective pipe inspection.
  • The technique allows for precise focusing across the entire pipe surface.
  • High-resolution defect detection, even for small flaws, is achievable with this guided wave approach.