Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Pipe Flowrate Measurement

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,...

Rapidly Varying Flow

Rapidly Varying Flow

Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Plasmon-Induced Hot-State Multiexciton Emission from Quantum Dots Coupled to Metallic Nanocavities.

ACS nano·2026

Same author

Ultranarrow linewidth photonic-atomic laser.

Laser & photonics reviews·2026

Same author

Ovarian pregnancy: clinical characteristics, diagnostic challenges, and sonographic features-a multicenter case series with narrative literature overview.

Archives of gynecology and obstetrics·2026

Same author

Does sonographic visual biofeedback before or during the second stage of labor improve outcomes? A meta-analysis.

International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics·2026

Same author

Linking Neonatal Birth Weight with AMH Levels in Umbilical Cord and Maternal Blood: A Prospective Study.

International journal of women's health·2026

Same author

Efficacy of energy-based devices on episiotomy pain and healing: A systematic review and meta-analysis.

International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics·2025

Same journal

RETRACTED: Zhang et al. A Novel Framework for Reconstruction and Imaging of Target Scattering Centers via Wide-Angle Incidence in Radar Networks. <i>Sensors</i> 2025, <i>25</i>, 6802.

Sensors (Basel, Switzerland)·2026

Same journal

Enhancing Unsupervised Multi-Source Domain Adaptation for Person Re-Identification via Mixture of Experts and Graph-Based Relation.

Sensors (Basel, Switzerland)·2026

Same journal

Development of an Instrumented Glove for Palmar Pressure Assessment in Kayakers.

Sensors (Basel, Switzerland)·2026

Same journal

Development and Experimental Validation of an Autonomous IoT-Based Monitoring System for Real-Time Water Quality Assessment in the Amazon River.

Sensors (Basel, Switzerland)·2026

Same journal

Semi-Supervised Adversarial Learning Framework for Controller Area Network Bus Intrusion Detection.

Sensors (Basel, Switzerland)·2026

Same journal

Smart Optimization Method for Safety Signs in Innovative Manufacturing Environments Integrating Industrial Field IoT Sensors and Knowledge Graphs.

Sensors (Basel, Switzerland)·2026

See all related articles

Search research articles

Related Experiment Video

Updated: Apr 24, 2026

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

Published on: January 28, 2022

Doppler-based flow rate sensing in microfluidic channels.

Liron Stern¹, Avraham Bakal², Mor Tzur³

¹Department of Applied Physics, The Benin School of Engineering and Computer Science, The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel. liron.stern@mail.huji.ac.il.

Sensors (Basel, Switzerland)

|September 12, 2014

Summary

This summary is machine-generated.

We developed a new method to measure flow rates in microfluidic devices using light Doppler shifts from bubbles. This technique achieves high precision for applications like flow cytometry and cell sorting.

More Related Videos

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Published on: August 27, 2013

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

Published on: June 27, 2025

Related Experiment Videos

Last Updated: Apr 24, 2026

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

Published on: January 28, 2022

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Published on: August 27, 2013

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition

Published on: June 27, 2025

Area of Science:

Microfluidics
Optical Physics
Biomedical Engineering

Background:

Microfluidic devices are crucial for lab-on-a-chip applications.
Accurate flow rate measurement is essential for controlling microfluidic processes.
Existing methods may lack precision or simplicity for certain applications.

Purpose of the Study:

To present a novel, generic method for detecting flow rates and velocity changes in microfluidic devices.
To demonstrate the experimental feasibility of the proposed technique.
To highlight the method's potential for lab-on-a-chip bio-applications.

Main Methods:

Design and fabrication of a microfluidic device.
Generation of a periodic array of bubbles within the microchannel.
Application of the Doppler shift principle on diffracted light from bubbles.
Utilizing self-heterodyne detection for analyzing diffracted light.

Main Results:

Successful experimental demonstration of the flow rate detection method.
Measurement of flow rates with an accuracy of approximately 2 mm/s.
Achieved a high resolution of 0.08 mm/s for flow velocity changes.
Validated the method's effectiveness in microfluidic settings.

Conclusions:

The developed method offers a simple and accurate way to measure flow rates in microfluidics.
The technique is suitable for various lab-on-a-chip bio-applications, including flow cytometry and cell sorting.
This optical Doppler-based approach provides a valuable tool for microfluidic control and analysis.