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Related Concept Videos

Pipe Flowrate Measurement: Problem Solving01:28

Pipe Flowrate Measurement: Problem Solving

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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...
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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.
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Single Pipe Systems01:24

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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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General Characteristics of Pipe Flow I01:22

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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.
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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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Updated: Dec 5, 2025

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
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Conductance-Based Interface Detection for Multi-Phase Pipe Flow.

Shiyao Wang1, Jesus Leonardo Corredor Garcia1, Jonathan Davidson2

  • 1Department of Civil and Structural Engineering, The University of Sheffield, Western Bank, Sheffield S10 2TN, UK.

Sensors (Basel, Switzerland)
|October 21, 2020
PubMed
Summary
This summary is machine-generated.

A new sensor accurately measures sediment and flow depth in sewers using conductance. This innovation aids in predicting blockages and improving flow models for better infrastructure management.

Keywords:
electrical conductance sensorlow-cost sensormedium electrical conductivity measurementmulti-phase interface detection

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Area of Science:

  • Environmental Engineering
  • Sensor Technology
  • Fluid Dynamics

Background:

  • Accurate monitoring of sediment and flow depth in sewer systems is crucial for effective hydraulic modeling.
  • Sewer blockages and surcharge events pose significant risks to urban infrastructure and public health.
  • Existing monitoring methods may lack the precision required for real-time, detailed analysis.

Purpose of the Study:

  • To develop and validate a novel sensor for precise sediment and flow depth measurement in conduits.
  • To assess the sensor's performance in laboratory settings and through finite-element modeling.
  • To establish the sensor's capability for real-time data acquisition in various environments.

Main Methods:

  • Development of a novel sensor utilizing relative conductance measurements between adjacent electrodes.
  • Derivation of a piecewise linear relationship between conductance and electrode length to determine interface positions.
  • Validation of sensor data using a finite-element model and analysis of error distribution.

Main Results:

  • The developed sensor accurately determines interface positions between sediment, water, and air.
  • Root mean square errors for interface level measurement were within 1.4% and 2.6% of the sensor's range.
  • Sensor performance was validated, with errors within the resolution of electrode length increments.

Conclusions:

  • The novel conductance-based sensor offers a valuable tool for accurate sediment and flow level quantification.
  • This technology has broad applications in sewer conduits, coastal environments, and drainage systems.
  • The sensor's precision supports improved flow modeling and proactive infrastructure management.