New Seeding and Surface Treatment Methods for Particle Image Velocimetry

Pierce, Adam J.; Lu, Frank K.

doi:10.2514/6.2011-1164

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…Investigations on tracer particles ability to follow the flow are carried out on an exemplary RoI (at the trachea): The hydraulic diameter d h is 25 mm in this exemplary measurement region, and the average velocity magnitude of the fluid is set to v ≈ 0.08 m s −1 . The estimations are made for the largest particles with a diameter of d p = 50 µm since smaller particles will lower the relaxation time [34,35]. The Stokes law is valid for a creeping flow around a single particle and small fluid's Reynolds numbers Re f .…”

Section: Particles and Working Fluidmentioning

confidence: 99%

Tomo-PIV in a patient-specific model of human nasal cavities: a methodological approach

Tauwald,

Erzinger,

Quadrio

et al. 2024

Meas. Sci. Technol.

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The human nose serves as the primary gateway for air to enter the respiratory system and plays a vital role in respiratory homeostasis. Nasal breathing difficulties are a significant health concern, leading to substantial healthcare costs for patients. Understanding nasal airflow dynamics is crucial for comprehending respiratory mechanisms. This article presents a detailed study using tomo-PIV to investigate nasal airflow dynamics while addressing its accuracy. The study includes the manufacturing of a transparent silicone model based on a clinical CT scan, refractive index matching to minimize optical distortions, and precise flow rate adjustments based on physiological breathing cycles. This method allows for spatial high-resolution investigations in different regions of interest within the nasopharynx during various phases of the breathing cycle. The results demonstrate the accuracy of the investigations, enabling detailed analysis of flow structures and gradients. This spatial high-resolution tomo-PIV approach provides valuable insights into the complex flow phenomena occurring during the physiological breathing cycle in the nasopharynx.The study’s findings contribute to advancements in non-free-of-sight experimental flow investigation of complex cavities under nearly realistic conditions. Furthermore, reliable and accurate experimental data is crucial for properly validating numerical approaches that compute this patient-specific flow for clinical purposes.

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Section: Particles and Working Fluidmentioning

confidence: 99%

Tomo-PIV in a patient-specific model of human nasal cavities: a methodological approach

Tauwald,

Erzinger,

Quadrio

et al. 2024

Meas. Sci. Technol.

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“…In stereoscopic or tomographic PIV applications, the surface conditions are often the only factor Combinations of these techniques have been reported as well (e.g. Pierce and Lu 2011). To the knowledge of the authors, a systematic comparative study has not been conducted thus far.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of surface reflection in PIV measurements

Paterna

Moonen

Dorer

et al. 2013

Meas. Sci. Technol.

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Surface reflections of high-intensity laser light are a common concern when conducting particle image velocimetry (PIV) measurements. Consequences range from a poor signal-to-noise ratio (overexposure) in near-surface areas up to camera sensor damage. The severity depends on the interplay between three factors: surface properties, laser light intensity and relative camera position. In stereoscopic or tomographic PIV setups, material selection is often the only factor which can be adapted. We present a systematic comparative study, involving different materials and surface treatments. Their potential to mitigate surface reflections is quantified against the reference case of a flat black painted wooden surface. The largest reduction of surface reflection intensity is obtained by applying fluorescent paint on wood or by employing electropolished steel. The more widely used flat black painted wood shows poor behavior.

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“…Moreover, the viewing angle cannot be guaranteed optimal in case of dynamic surfaces. If rigid body motions are considered, additional surface treatments such as polishing or adding a fluorescent coating may potentially reduce reflections further [4,5].…”

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confidence: 99%

Particle Image Velocimetry near Interfaces: A Moving Future

Theunissen¹

2012

J Aeronaut Aerospace Eng

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Particle Image Velocimetry (PIV) has become a standardized measurement technique in the field of experimental research both in academic and industrial environments with applications covering the breadth of fluid dynamics. The metrology's success must be ascribed to its non-intrusive nature together with its intrinsic simplicity and ability to retrieve vast amounts of instantaneous spatial velocity information (order of giga-to terabytes) relative to the short operation time (order of seconds). While the majority of PIV image processing related studies have been aimed so far at improving the accuracy of the fluid velocities extraction, PIV image analysis involving arbitrarily moving bodies has received limited to no attention. Notwithstanding, it is expected that great advances can be made in the field of fluid-structure interactions by improving the technique's measurement capabilities as a direct result of enhanced image analyses.

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New Seeding and Surface Treatment Methods for Particle Image Velocimetry

Cited by 6 publications

References 25 publications

Tomo-PIV in a patient-specific model of human nasal cavities: a methodological approach

Tomo-PIV in a patient-specific model of human nasal cavities: a methodological approach

Mitigation of surface reflection in PIV measurements

Particle Image Velocimetry near Interfaces: A Moving Future

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