Oscillation dynamics of a bubble rising in viscous liquid

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Uittreksel

In the present work, we study the oscillation dynamics of 3 mm-diameter bubbles generated through an orifice submerged in viscous liquids. The viscosity of those liquids is varied to change the behavior of the rising bubble. The details of the rising motion and shape oscillation of the bubbles are measured using a combination of high speed, high-resolution imaging, and an accurate digital image processing technique. Direct Numerical Simulations that mimic the experimental conditions are also performed using a front-tracking technique, called the Local Front Reconstruction Method. The predictions of the bubble shape and rising velocity obtained by the numerical simulations show good agreement with the experimental results. Our experimental and numerical results show that the oscillation frequency and the damping rate at lower modes can be predicted using available theoretical models found in the literature. However, discrepancies arise between our results with the theoretical predictions at higher order oscillation modes. We conclude that the discrepancies are due to the influence of rising motion and the vortex wave, which is not considered in the theoretical models.
TaalEngels
Artikelnummer130
Aantal pagina's13
TijdschriftExperiments in Fluids
Volume60
Nummer van het tijdschrift8
DOI's
StatusGepubliceerd - 25 jul 2019

Vingerafdruk

Bubbles (in fluids)
bubbles
Viscosity of liquids
oscillations
Direct numerical simulation
Liquids
liquids
Orifices
Image processing
Vortex flow
Damping
Imaging techniques
Computer simulation
orifices
predictions
direct numerical simulation
image processing
damping
high speed
vortices

Citeer dit

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title = "Oscillation dynamics of a bubble rising in viscous liquid",
abstract = "In the present work, we study the oscillation dynamics of 3 mm-diameter bubbles generated through an orifice submerged in viscous liquids. The viscosity of those liquids is varied to change the behavior of the rising bubble. The details of the rising motion and shape oscillation of the bubbles are measured using a combination of high speed, high-resolution imaging, and an accurate digital image processing technique. Direct Numerical Simulations that mimic the experimental conditions are also performed using a front-tracking technique, called the Local Front Reconstruction Method. The predictions of the bubble shape and rising velocity obtained by the numerical simulations show good agreement with the experimental results. Our experimental and numerical results show that the oscillation frequency and the damping rate at lower modes can be predicted using available theoretical models found in the literature. However, discrepancies arise between our results with the theoretical predictions at higher order oscillation modes. We conclude that the discrepancies are due to the influence of rising motion and the vortex wave, which is not considered in the theoretical models.",
author = "Gaopan Kong and Haryo Mirsandi and Buist, {Kay A.} and Frank Peters and Baltussen, {Maike W.} and Hans Kuipers",
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Oscillation dynamics of a bubble rising in viscous liquid. / Kong, Gaopan; Mirsandi, Haryo; Buist, Kay A. (Corresponding author); Peters, Frank; Baltussen, Maike W.; Kuipers, Hans.

In: Experiments in Fluids, Vol. 60, Nr. 8, 130, 25.07.2019.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

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