The influence of image analysis methodology on the calculation of granular temperature for granular flows

Taylor-Noonan, Alexander; Gollin, Devis; Bowman, Elisabeth T.; Take, W. Andy

doi:10.1007/s10035-021-01153-y

Cited by 10 publications

(4 citation statements)

References 31 publications

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Section: Particle Displacement and Velocitymentioning

confidence: 99%

“…The Particle Tracking Velocimetry (PTV) method involves first identifying the particle locations in selected frames and then using a PTV algorithm to link individual particles in successive frames (Brevis et al., 2010; Gollin et al., 2017; A. M. Taylor‐Noonan et al., 2021). In our experiments, the camera is oriented to match the inclination of the flume base to optimize the field of view, for example, so the particle movement vectors (Figure 3a) are generally horizontal in the illustrations.…”

Section: High‐speed Video Analysis and Calculated Quantitiesmentioning

confidence: 99%

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Influence of Pore Fluid on Grain‐Scale Interactions and Mobility of Granular Flows of Differing Volume

et al. 2022

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The presence of a pore fluid is recognized to significantly increase the mobility of saturated over dry granular flows. However, the mechanisms through which pore fluid increases mobility may not be captured in experimental flows of small volume typical of laboratory conditions. Here we present the results of dry and initially fluid saturated or “wet” experimental flows of near‐monodisperse coarse‐grained ceramic particles in a large laboratory flume for five source volumes of 0.2–1.0 m3. Measurements include flow height, velocity profile, pore pressure, and evolving solid volume fraction, as well as the final deposit shape. The dry experiments constrain the frictional properties of the common granular material and comparison with wet flows permits an independent evaluation of the interstitial fluid effects. These results demonstrate that flow dilation and strong variation in the velocity profile are directly linked to a greatly increased mobility for wet granular flows compared to dry, and a significant influence of scale as controlled by source volume on flow behavior. Excess pore pressure need not be present for these effects to occur.

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Section: Particle Displacement and Velocitymentioning

confidence: 99%

Section: High‐speed Video Analysis and Calculated Quantitiesmentioning

confidence: 99%

Influence of Pore Fluid on Grain‐Scale Interactions and Mobility of Granular Flows of Differing Volume

et al. 2022

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“…In general, the success of the different techniques in measuring velocity profiles is well established, however, there are problems with the majority of methods in the correct determination of granular temperature [3] -with both over and underestimation possible. Within the network, research has been conducted to develop a method that benefits from the unique strengths of both PIV and PTV and avoids their weaknesses [4]. The new method, termed "hybrid PIV" uses the texture (PIV) of individual particles (PTV) to follow their motion discretely (Fig 3 -bottom).…”

Section: Image Processingmentioning

confidence: 99%

The Rosetta Stone Project – Integrating experimental results on debris flow mechanics across the scales: Next results

Bowman,

Fawley,

Kaitna

et al. 2023

E3S Web of Conf.

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We present the combined efforts of a research network designed to address the many challenges in the experimental modelling of debris flow phenomena. The approach has been to use apparatuses of different functional arrangement and at different scale with identical and commonly sourced flow materials from the highly idealised (dry, coarse and uniform) to the highly complex (well graded, segregating, fluid saturated). Here we briefly present some key findings of the network and point to the research questions that are currently being addressed. This complementary view of experimental debris flows helps to constrain methodological artefacts/scale effects and to identify key processes responsible for the diverse appearance and often high mobility of debris flows.

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Section: Particle Displacement and Velocitymentioning

confidence: 99%

Effect of pore fluid on grain-scale interactions and mobility of granular flows: Comparison of distal reach for increasing source volume for dry and and saturated granular flows

Taylor-Noonan

Bowman

McArdell

et al. 2022

Preprint

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The influence of image analysis methodology on the calculation of granular temperature for granular flows

Abstract: This is a repository copy of The influence of image analysis methodology on the calculation of granular temperature for granular flows.

Cited by 10 publications

References 31 publications

Influence of Pore Fluid on Grain‐Scale Interactions and Mobility of Granular Flows of Differing Volume

Influence of Pore Fluid on Grain‐Scale Interactions and Mobility of Granular Flows of Differing Volume

The Rosetta Stone Project – Integrating experimental results on debris flow mechanics across the scales: Next results

Effect of pore fluid on grain-scale interactions and mobility of granular flows: Comparison of distal reach for increasing source volume for dry and and saturated granular flows

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