Measurement of turbulence statistics in single-phase and two-phase flows using ultrasound imaging velocimetry

Gurung, Arati; Poelma, Christian

doi:10.1007/s00348-016-2266-x

Cited by 27 publications

(11 citation statements)

References 29 publications

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“…For colloidal particles (much smaller than the wavelength of sound), the signal will be speckle-like in nature [101]. For larger particles, the individual particle images can often be distinguished in dilute flows [102]. As water by In vivo measurement of the velocity in a carotid artery using ultrasound imaging velocimetry/echo-PIV a raw ultrasound images (using contrast medium).…”

Section: Ultrasound Imaging Velocimetry ('Echo-piv')mentioning

confidence: 99%

“…While UIV might not be the first choice for single-phase measurements, it is common to perform reference measurements with the same technique before addressing particle-laden cases [100]. For single-phase measurements, conventional PIV tracer material can be used [102]. Much higher signal-to-noise ratios can be obtained by using tracer material specifically designed for ultrasound imaging: contrast medium.…”

Section: Ultrasound Imaging Velocimetry ('Echo-piv')mentioning

confidence: 99%

“…For dispersed multiphase flows, these benchmarks have not yet been established. One approach could be to test techniques using a relatively low volume fraction and compare to single-phase results [102]. However, it is a better strategy to design specific multiphase cases.…”

Section: Future Perspectivesmentioning

confidence: 99%

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Measurement in opaque flows: a review of measurement techniques for dispersed multiphase flows

Poelma

2020

Acta Mech

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A review is presented of measurement techniques to characterise dispersed multiphase flows, which are not accessible by means of conventional optical techniques. The main issues that limit the accuracy and effectiveness of optical techniques are briefly discussed: cross-talk, a reduced signal-to-noise ratio, and (biased) data drop-out. Extensions to the standard optical techniques include the use of fluorescent tracers, refractive index matching, ballistic imaging, structured illumination, and optical coherence tomography. As the first non-optical technique, a brief discussion of electrical capacitance tomography is given. While truly non-invasive, it suffers from a low resolving power. Ultrasound-based techniques have rapidly evolved from Doppler-based profiling to recent 2D approaches using feature tracking. The latter is also suitable for timeresolved flow studies. Magnetic resonance velocimetry can provide time-averaged velocity fields in 3D for the continuous phase. Finally, X-ray imaging is demonstrated to be an important tool to quantify local gas fractions. While potentially very powerful, the impact of the techniques will depend on the development of acquisition and measurement protocols for fluid mechanics, rather than for clinical imaging. This requires systematic development, aided by careful validation experiments. As theoretical predictions for multiphase flows are sparse, it is important to formulate standardised 'benchmark' flows to enable this validation.

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Section: Ultrasound Imaging Velocimetry ('Echo-piv')mentioning

confidence: 99%

Section: Ultrasound Imaging Velocimetry ('Echo-piv')mentioning

confidence: 99%

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Measurement in opaque flows: a review of measurement techniques for dispersed multiphase flows

Poelma

2020

Acta Mech

Self Cite

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“…In order to achieve flow measurements in suspensions with high volume fractions, non-optical based techniques such as ultrasound imaging velocimetry (UIV) should be implemented. UIV has been developed for fluid dynamics applications and embraced by many researchers to study fluid flows (Gurung and Poelma, 2016;Jeronimo et al, 2019). Although, UIV provides useful information about the flow physics, it is unable to provide Lagrangian quantities such as particle trajectories, which is a key parameter to study entrainment and particle-wall interactions.…”

Section: Introductionmentioning

confidence: 99%

Development of Echo-LPT for the study of particle-wall interactions in dense suspensions

Samie¹,

Zhang²,

Najjari³

et al. 2021

ISPIV21

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Examining the behaviour of dense suspensions has proven to be difficult, both experimentally and numerically. Using super water–absorbent polymer, PIV measurement was successfully conducted in a hydrogel suspension with a volume fraction (VF) of Φ =20% (see Zhang and Rival, 2018). However, due to the slightly refractive index mismatch, the image quality will degrade significantly as the particle loading of the hydrogel is increased. In order to achieve flow measurements in suspensions with high volume fractions, non-optical based techniques such as ultrasound imaging velocimetry (UIV) should be implemented. UIV has been developed for fluid dynamics applications and embraced by many researchers to study fluid flows (Gurung and Poelma, 2016; Jeronimo et al., 2019). Although, UIV provides useful information about the flow physics, it is unable to provide Lagrangian quantities such as particle trajectories, which is a key parameter to study entrainment and particle-wall interactions.

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“…Several experimental techniques have been developed in recent years to achieve quantitative measurements of flows in dense (opaque) suspensions, including ultrasound imaging velocimetry, x-ray imaging velocimetry, and magnetic resonance imaging. [24][25][26] In comparison with these techniques, RIM techniques can render suspensions optically transparent, thus making such flows compatible with traditional optical measurements such as particle image velocimetry (PIV), particle tracking velocimetry (PTV), laser induced fluorescence (LIF), and laser Doppler velocimetry (LDV). However, as summarized by Wiederseiner et al, 27 RIM techniques require strict experimental controls (e.g., mixing of different liquids, temperature control, and humidity control).…”

Section: Introductionmentioning

confidence: 99%

Experimental study of turbulence decay in dense suspensions using index-matched hydrogel particles

Zhang

Rival

2018

Physics of Fluids

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In the present study, a refractive-index matching (RIM) technique using hydrogel particles was developed to quantitatively measure turbulence characteristics in dense suspensions. Compared to classic RIM methods, the use of superabsorbent polymer (SAP) material significantly simplifies experimental procedures and avoids strict experimental controls, which makes the method particularly suitable for turbulence measurements in dense suspensions. Because of the high absorbency of the approximately 1 mm SAP particles, optical visibility is achieved even in dense suspensions on the order of 20% by volume. Furthermore, the small hydrogel particle diameter allows for a particle diameter-to-integral scale ratio value of 1/20. The new method is then used to reveal the flow characteristics in decaying turbulence with suspension volume fractions up to 18.4% (the measurements pass through approximately 85 hydrogel particle-water interfaces). Evidence of turbulence attenuation in suspensions is demonstrated and attributed to the inhibition of turbulence production in said suspensions. The modulations in turbulence decay are apparent even in low suspension volume fractions (2.3%), whereas the turbulence characteristics of suspensions at higher volume fractions of 9.2% and 18.4% are observed to converge on each other.

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Measurement of turbulence statistics in single-phase and two-phase flows using ultrasound imaging velocimetry

Cited by 27 publications

References 29 publications

Measurement in opaque flows: a review of measurement techniques for dispersed multiphase flows

Measurement in opaque flows: a review of measurement techniques for dispersed multiphase flows

Development of Echo-LPT for the study of particle-wall interactions in dense suspensions

Experimental study of turbulence decay in dense suspensions using index-matched hydrogel particles

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