Effects on oily sand jet evolution from impact momentum and channelization of particles through an immiscible interface

Manzouri, Masoud; Azimi, Amir H.

doi:10.1016/j.ijmultiphaseflow.2019.103124

Cited by 13 publications

(3 citation statements)

References 50 publications

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“…The immiscible layer develops a double-layer splash structures while the splash crown is continuous for the well-studied corresponding case of water entry. Recent studies on the energy dissipation of sand particles passing through an immiscible layer and through viscous ambient were also shown comparable features to the water entry of solid spheres (Mohammadidinani et al, 2017;Azimi, 2019;Manzouri and Azimi, 2019;Janati et al, 2022).…”

Section: Introductionmentioning

confidence: 80%

Effects of impact energy on the crown formation and underwater cavity of free-falling thick disks

Janati

Azimi

2022

Preprint

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A series of laboratory experiments was conducted to investigate the effects of impact energy on the crown formation and cavity dynamics of free-falling thick disks in stagnant water. To simulate the effects of impact energy on the dynamics of free-falling thick disks, four different release heights, hr, and six different disk masses were considered. A threshold limit of hr = 4do, where do is the disk diameter, was obtained as different patterns of cavity dynamics and crown characteristics were observed during the impact and descending of solid disks. The evolution of crown characteristics such as crown shape, diameter, and height with time were measured, and the pinch-off time and location of pinch-off were extracted from image analysis. Experimental results revealed that the crown characteristics at the pinch-off varied linearly with the impact Froude number and they were larger than solid spheres. A threshold value of non-dimensional impact energy to create a full seal crown was obtained which occurred when impact energy was more than 36% of the initial energy. The variations of crown diameter at the pinch-off indicated relatively larger crown diameters for hr/do > 4 whereas the crown height was invariant with release height. The results indicated a relatively shorter pinch-off depth in gravity-driven disks in comparison with the force-driven disks and gravity driven sphere in stagnant water. The energy losses due to impact, crown formation, and pinch-off were calculated for all tests and an adverse correlation was found between normalized energy losses and impact Froude number. Experimental observations indicated that disks with smaller impact energy dissipated more energy due to the impact. The time variations of the frontal position and velocity of disks showed that the threshold release height highly affected the trajectory, falling speed, and the duration of the descending process.

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Section: Introductionmentioning

confidence: 80%

Effects of impact energy on the crown formation and underwater cavity of free-falling thick disks

Janati

Azimi

2022

Preprint

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“…Considering that air release height will have impact on the structure of particle clouds (Manzouri and Azimi, 2019), this study only modified the empirical formula to propose an equation for predicting the width of the coral sand particle clouds applicable to η=7:…”

Section: Front Positionmentioning

confidence: 99%

“…Less attention has been paid to shape, structure and materials of individual particle. Recent evidence suggests that coral sand differs significantly between glass bead (Bush et al, 2003;Gensheimer et al, 2013;Lai et al, 2016;Noh, 2000;Noh and Fernando, 1993) and silica sand (Azimi et al, 2012;Manzouri and Azimi, 2019;Moghadaripour et al, 2017aMoghadaripour et al, , 2017bMohammadidinani et al, 2017;Pakzad and Azimi, 2017) in structure and shape so that the settling speed of single particles is very different (Riazi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Experiment Study of the Evolution of Coral Sand Particle Clouds in Water

et al. 2022

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The motion of particle clouds (i.e., sediment clouds) usually can be found in engineering applications such as wastewater discharge, land reclamation, and marine bed capping. In this paper, a series of laboratory tests are conducted on coral sand to investigate the shape feature of the single particle and the mixing processes of the coral sand particle clouds. The shape of coral sand particle is measured and quantified. The experimental results demonstrate that the shape of coral sand particles tends to be spherical as the particle size decreases, and empirical equations were established to explain the variation of D50 and fS,50 of coral sand. Compared with the silica sand, the evolution of the coral sand particle cloud still experiences three stages, but the threshold for the Reynolds number of particle clouds entering the next stage changes. Further, the normalized axial distance of the coral sand particle clouds is 58% smaller. The frontal velocity exhibits similar varying tendency for the coral sand particle cloud. Considering the difference in shape between coral sand particles and silica sand particles, a semi-empirical formula was proposed based on the original silica sand prediction formula by adding the shape factor and the experimental data of 122 µm⩽D50⩽842 µm. It can predict the frontal velocity of the coral sand particle clouds.

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Effect of Release Height on the Motion of Particle Cloud in Stagnant Water

Sabershahraki,

Azimi

2024

Lecture Notes in Civil Engineering

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Effects on oily sand jet evolution from impact momentum and channelization of particles through an immiscible interface

Cited by 13 publications

References 50 publications

Effects of impact energy on the crown formation and underwater cavity of free-falling thick disks

Effects of impact energy on the crown formation and underwater cavity of free-falling thick disks

Experiment Study of the Evolution of Coral Sand Particle Clouds in Water

Effect of Release Height on the Motion of Particle Cloud in Stagnant Water

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