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Related Concept Videos

Single Pipe Systems01:24

Single Pipe Systems

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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.
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...
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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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Pipe Flowrate Measurement: Problem Solving01:28

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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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Typical Model Studies01:30

Typical Model Studies

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Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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Pipe Flowrate Measurement01:28

Pipe Flowrate Measurement

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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.
The orifice meter is a simple,...
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Major Losses in Pipes01:28

Major Losses in Pipes

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When a fluid flows through a pipe, it experiences energy losses due to frictional resistance along the pipe walls, known as major losses. These energy losses result in a pressure drop, which varies based on the flow conditions — whether laminar or turbulent — and the specific physical properties of the fluid and pipe.
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Related Experiment Video

Updated: Feb 28, 2026

Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
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Study on Underground Sewage Pipeline Temperature Based on OFDR Technology and Numerical Simulation Methods.

Lei Gao1, Xinyu Wu1, Zhuodi Zheng1

  • 1Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210024, China.

Sensors (Basel, Switzerland)
|February 27, 2026
PubMed
Summary

Underground sewage pipeline temperatures are slowly rising, with a maximum change of 0.55°C observed. This research provides key insights into pipeline thermal behavior for safe urban infrastructure operation.

Keywords:
field testnumerical simulationoptical frequency domain reflectometrysewage pipelinetemperature

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Area of Science:

  • Civil Engineering
  • Environmental Engineering
  • Geotechnical Engineering

Background:

  • Underground sewage pipelines are critical urban infrastructure.
  • Pipeline temperature significantly impacts the safe operation of sewage systems.

Purpose of the Study:

  • To monitor and analyze the temperature variations in an underground sewage pipeline.
  • To explore the spatiotemporal distribution of sewage pipeline temperatures.
  • To provide a reference for future research on sewage pipeline thermal management.

Main Methods:

  • Conducted in-situ temperature monitoring experiments on a sewage pipeline in Nanjing.
  • Utilized Optical Frequency Domain Reflectometry (OFDR) for temperature data acquisition.
  • Employed numerical simulation methods to study temperature variations.

Main Results:

  • Observed a continuous, slow upward trend in underground sewage pipeline temperatures.
  • Recorded a maximum temperature change of 0.55°C.
  • Numerical simulation results aligned with the experimental monitoring data.

Conclusions:

  • The study successfully characterized the thermal behavior of the underground sewage pipeline.
  • Findings confirm the slow temperature increase and provide valuable data for infrastructure safety.
  • The integrated approach of experimental monitoring and numerical simulation is effective for pipeline temperature analysis.