Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Boundary Layer Characteristics01:18

Boundary Layer Characteristics

286
When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
286
Velocity and Acceleration in Steady and Unsteady Flow01:11

Velocity and Acceleration in Steady and Unsteady Flow

229
In fluid mechanics, velocity and acceleration are key concepts for analyzing particle motion in both steady and unsteady flow. Consider a fluid particle moving along a pathline, where its velocity depends on its position and time. The particle's acceleration is obtained by differentiating the velocity with respect to time.
The acceleration can be generalized to any point in the flow, and expressed as components along three perpendicular directions, representing changes in velocity over...
229
Laminar and Turbulent Flow01:07

Laminar and Turbulent Flow

9.7K
Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
9.7K
Bernoulli's Equation for Flow Normal to a Streamline01:16

Bernoulli's Equation for Flow Normal to a Streamline

1.0K
Bernoulli's equation for flow normal to a streamline explains how pressure varies across curved streamlines due to the outward centrifugal forces induced by the fluid's curvature. The pressure is higher on the inner side of the curve, near the center of curvature, and decreases outward to balance these centrifugal forces.
The pressure difference depends on the fluid's velocity and radius of curvature. The pressure variation is minimal in flows with nearly straight streamlines.
1.0K
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

496
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
496
Bernoulli's Equation for Flow Along a Streamline01:30

Bernoulli's Equation for Flow Along a Streamline

1.2K
Bernoulli's equation relates the energy conservation in a fluid moving along a streamline. The equation applies to incompressible and inviscid fluids under steady flow. For such a flow, Newton's second law is applied to a small fluid element, which experiences forces due to pressure differences, gravity, and velocity variations. The force balance leads to the following form of Bernoulli's equation:
1.2K

You might also read

Related Articles

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

Sort by
Same author

Advances in the diagnosis and detection of chronic kidney disease.

Lancet (London, England)·2026
Same author

Single-shot multi-time-frame imaging of plasmas with a frequency tagged GHz pulse train.

Applied optics·2026
Same author

Theoretical model and experimental characterization of high-power burst-mode Nd:YAG laser amplification.

Applied optics·2026
Same author

Applications of single-beam 100  kHz krypton tagging velocimetry in high-pressure N<sub>2</sub> flows.

Applied optics·2025
Same author

Ballistic range experimental results of radiating wakes of spheres at Mach 10.

Applied optics·2025
Same author

Laser applications to chemical, security, and environmental analysis: introduction to the feature issue.

Applied optics·2025

Related Experiment Video

Updated: Nov 1, 2025

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
11:51

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

Published on: February 22, 2018

8.9K

Hypersonic N2 boundary layer flow velocity profile measurements using FLEET.

Jonathan L Hill, Paul S Hsu, Naibo Jiang

    Applied Optics
    |June 18, 2021
    PubMed
    Summary

    Femtosecond laser electronic excitation tagging (FLEET) velocimetry measured hypersonic boundary layer velocity. This technique offers potential for studying laminar and turbulent boundary layer dynamics in high-speed flows.

    More Related Videos

    Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
    13:02

    Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow

    Published on: February 27, 2016

    12.5K
    High-speed Particle Image Velocimetry Near Surfaces
    11:59

    High-speed Particle Image Velocimetry Near Surfaces

    Published on: June 24, 2013

    33.4K

    Related Experiment Videos

    Last Updated: Nov 1, 2025

    Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
    11:51

    Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

    Published on: February 22, 2018

    8.9K
    Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
    13:02

    Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow

    Published on: February 27, 2016

    12.5K
    High-speed Particle Image Velocimetry Near Surfaces
    11:59

    High-speed Particle Image Velocimetry Near Surfaces

    Published on: June 24, 2013

    33.4K

    Area of Science:

    • Fluid dynamics
    • Aerodynamics
    • Hypersonic flow research

    Background:

    • Boundary layer measurements are crucial for understanding aerodynamic performance.
    • Hypersonic flow presents unique challenges for diagnostic techniques.

    Purpose of the Study:

    • To apply Femtosecond Laser Electronic Excitation Tagging (FLEET) velocimetry for direct boundary layer velocity measurements.
    • To investigate the effects of model tip bluntness and Reynolds number on velocity profiles.
    • To assess FLEET's applicability in hypersonic boundary layer studies.

    Main Methods:

    • Utilized FLEET velocimetry in a Mach-6 Ludwieg tube.
    • Tested on an ogive-cylinder model in pure N2 flows.
    • Extracted one-dimensional velocity profiles in laminar boundary layers.

    Main Results:

    • Successfully obtained velocity profiles in laminar boundary layers.
    • Analyzed the influence of model geometry and flow conditions.
    • Identified challenges and developed strategies for FLEET application.

    Conclusions:

    • FLEET velocimetry is a viable method for direct hypersonic boundary layer velocity measurement.
    • The study demonstrates FLEET's potential for advancing research in laminar and turbulent boundary layers.
    • FLEET offers a promising tool for future hypersonic flow diagnostics.