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Understanding Fluid Dynamics Through High-Speed Imaging: Time-Resolved Particle Image Velocimetry (TR-PIV)

Oxford Lasers provides expertise and advanced imaging solutions in the dynamic evaluation of fluids. Time-Resolved Particle Image Velocimetry (TR-PIV) in an extension of the traditional Particle Image Velocimetry (PIV) technique, and it is used to capture and analyse time-dependent variations in fluid flow.

While standard PIV provides instantaneous snapshots of the flow field, TR-PIV captures sequences of images over time, allowing researchers to study dynamic flow phenomena, transient events, and temporal changes in velocity fields. 

Time-Resolved PIV is a powerful tool for gaining insights into the dynamic nature of fluid flows. It enables researchers to observe and analyse how flow patterns change over time, providing a more comprehensive understanding of fluid dynamics in a wide range of applications.  Oxford Lasers, a pioneer in time-resolved PIV are here to help you solve your complex flow studies.

 Applications of Time-Resolved PIV include:

Turbulence Studies: TR-PIV is valuable for investigating the dynamics of turbulent flows, shedding light on how vortices and turbulent structures evolve over time.

Aerodynamics: In aerodynamics research, TR-PIV can be used to study unsteady flow phenomena around aircraft wings, airfoils, or other aerodynamic surfaces.

Fluid-Structure Interaction: TR-PIV helps in understanding how fluid flows interact with structures over time, which is crucial in fields like biomechanics and engineering.

Combustion Studies: TR-PIV is used to study the transient behavior of flames and combustion processes.

Environmental Flows: Understanding time-dependent variations in rivers, oceans, and other environmental flows is critical for various environmental studies.

 

Here’s how Time-Resolved PIV generally works:

  1. Seeding the Flow:

Similar to standard PIV, TR-PIV involves seeding the fluid with small particles that can follow the flow motion accurately.

  1. Pulsed Illumination:

Instead of a continuous laser sheet used in standard PIV, TR-PIV involves pulsed illumination. The laser is pulsed at a controlled rate to create short-duration light sheets. Each pulse captures an image of the flow at a specific moment in time.

  1. Image Capture:

A high-speed camera captures a sequence of images, each corresponding to a different laser pulse. The time delay between successive images provides temporal resolution. 

  1. Image Processing:

Specialized software processes the sequence of images, tracking the movement of particles over time. The result is a series of velocity vector fields representing the evolution of the flow field over the captured time interval.

  1. Velocity Field Analysis:

The temporal resolution of TR-PIV allows researchers to analyze the transient behavior of the flow, observe vortex shedding, study turbulence structures, and capture other time-dependent flow phenomena.

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