SIMULATIONS OF DROPLET COLLISIONS IN SHEAR FLOW

Orest Shardt; J. J. Derksen; Sushanta K. Mitra

doi:10.1115/IMECE2012-87106

SIMULATIONS OF DROPLET COLLISIONS IN SHEAR FLOW

Orest Shardt^*, J. J. Derksen, Sushanta K. Mitra

^*Corresponding author for this work

Engineering

Research output: Chapter in Book/Report/Conference proceeding › Published conference contribution

1 Citation (Scopus)

Abstract

When droplets collide in a shear flow, they may coalesce or remain separate after the collision. At low Reynolds numbers, droplets coalesce when the capillary number does not exceed a critical value. We present three-dimensional simulations of droplet coalescence in a simple shear flow. We use a free-energy lattice Boltzmann method (LBM) and study the collision outcome as a function of the Reynolds and capillary numbers. We study the Reynolds number range from 0.2 to 1.4 and capillary numbers between 0.1 and 0.5. We determine the critical capillary number for the simulations (0.19) and find that it is does not depend on the Reynolds number. The simulations are compared with experiments on collisions between confined droplets in shear flow. The critical capillary number in the simulations is about a factor of 25 higher than the experimental value.

Original language	English
Title of host publication	Proceedings of ASME 2012 International Mechanical Engineering Congress and Exposition
Subtitle of host publication	Micro- and Nano-Systems Engineering and Packaging, Parts A and B
Publisher	AMER SOC MECHANICAL ENGINEERS
Pages	645-652
Number of pages	8
Volume	9
ISBN (Print)	978-0-7918-4525-7
DOIs	https://doi.org/10.1115/IMECE2012-87106
Publication status	Published - 2013
Event	ASME International Mechanical Engineering Congress and Exposition - Houston Duration: 9 Nov 2012 → 15 Nov 2012

Conference

Conference	ASME International Mechanical Engineering Congress and Exposition
City	Houston
Period	9/11/12 → 15/11/12

Keywords

LATTICE-BOLTZMANN METHOD
CONCENTRATED EMULSION
DEFORMABLE DROPS
COALESCENCE
FLUID
SIMULATION
COLLISIONS (PHYSICS)
DROPS
SHEAR FLOW
ENGINEERING SIMULATION

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SIMULATIONS OF DROPLET COLLISIONS IN SHEAR FLOW. / Shardt, Orest; Derksen, J. J.; Mitra, Sushanta K.

Proceedings of ASME 2012 International Mechanical Engineering Congress and Exposition: Micro- and Nano-Systems Engineering and Packaging, Parts A and B. Vol. 9 AMER SOC MECHANICAL ENGINEERS, 2013. p. 645-652.

Research output: Chapter in Book/Report/Conference proceeding › Published conference contribution

Shardt, O, Derksen, JJ & Mitra, SK 2013, SIMULATIONS OF DROPLET COLLISIONS IN SHEAR FLOW. in Proceedings of ASME 2012 International Mechanical Engineering Congress and Exposition: Micro- and Nano-Systems Engineering and Packaging, Parts A and B. vol. 9, AMER SOC MECHANICAL ENGINEERS, pp. 645-652, ASME International Mechanical Engineering Congress and Exposition, Houston, 9/11/12. https://doi.org/10.1115/IMECE2012-87106

@inproceedings{0861ddb4169f407b8e32bf5c21e80787,

title = "SIMULATIONS OF DROPLET COLLISIONS IN SHEAR FLOW",

abstract = "When droplets collide in a shear flow, they may coalesce or remain separate after the collision. At low Reynolds numbers, droplets coalesce when the capillary number does not exceed a critical value. We present three-dimensional simulations of droplet coalescence in a simple shear flow. We use a free-energy lattice Boltzmann method (LBM) and study the collision outcome as a function of the Reynolds and capillary numbers. We study the Reynolds number range from 0.2 to 1.4 and capillary numbers between 0.1 and 0.5. We determine the critical capillary number for the simulations (0.19) and find that it is does not depend on the Reynolds number. The simulations are compared with experiments on collisions between confined droplets in shear flow. The critical capillary number in the simulations is about a factor of 25 higher than the experimental value.",

keywords = "LATTICE-BOLTZMANN METHOD, CONCENTRATED EMULSION, DEFORMABLE DROPS, COALESCENCE, FLUID, SIMULATION, COLLISIONS (PHYSICS), DROPS, SHEAR FLOW, ENGINEERING SIMULATION",

author = "Orest Shardt and Derksen, {J. J.} and Mitra, {Sushanta K.}",

note = "ACKNOWLEDGMENT This research has been enabled by the use of computing resources provided by WestGrid and Compute/Calcul Canada.; ASME International Mechanical Engineering Congress and Exposition ; Conference date: 09-11-2012 Through 15-11-2012",

year = "2013",

doi = "10.1115/IMECE2012-87106",

language = "English",

isbn = "978-0-7918-4525-7",

volume = "9",

pages = "645--652",

booktitle = "Proceedings of ASME 2012 International Mechanical Engineering Congress and Exposition",

publisher = "AMER SOC MECHANICAL ENGINEERS",

}

TY - GEN

T1 - SIMULATIONS OF DROPLET COLLISIONS IN SHEAR FLOW

AU - Shardt, Orest

AU - Derksen, J. J.

AU - Mitra, Sushanta K.

N1 - ACKNOWLEDGMENT This research has been enabled by the use of computing resources provided by WestGrid and Compute/Calcul Canada.

PY - 2013

Y1 - 2013

N2 - When droplets collide in a shear flow, they may coalesce or remain separate after the collision. At low Reynolds numbers, droplets coalesce when the capillary number does not exceed a critical value. We present three-dimensional simulations of droplet coalescence in a simple shear flow. We use a free-energy lattice Boltzmann method (LBM) and study the collision outcome as a function of the Reynolds and capillary numbers. We study the Reynolds number range from 0.2 to 1.4 and capillary numbers between 0.1 and 0.5. We determine the critical capillary number for the simulations (0.19) and find that it is does not depend on the Reynolds number. The simulations are compared with experiments on collisions between confined droplets in shear flow. The critical capillary number in the simulations is about a factor of 25 higher than the experimental value.

AB - When droplets collide in a shear flow, they may coalesce or remain separate after the collision. At low Reynolds numbers, droplets coalesce when the capillary number does not exceed a critical value. We present three-dimensional simulations of droplet coalescence in a simple shear flow. We use a free-energy lattice Boltzmann method (LBM) and study the collision outcome as a function of the Reynolds and capillary numbers. We study the Reynolds number range from 0.2 to 1.4 and capillary numbers between 0.1 and 0.5. We determine the critical capillary number for the simulations (0.19) and find that it is does not depend on the Reynolds number. The simulations are compared with experiments on collisions between confined droplets in shear flow. The critical capillary number in the simulations is about a factor of 25 higher than the experimental value.

KW - LATTICE-BOLTZMANN METHOD

KW - CONCENTRATED EMULSION

KW - DEFORMABLE DROPS

KW - COALESCENCE

KW - FLUID

KW - SIMULATION

KW - COLLISIONS (PHYSICS)

KW - DROPS

KW - SHEAR FLOW

KW - ENGINEERING SIMULATION

U2 - 10.1115/IMECE2012-87106

DO - 10.1115/IMECE2012-87106

M3 - Published conference contribution

SN - 978-0-7918-4525-7

VL - 9

SP - 645

EP - 652

BT - Proceedings of ASME 2012 International Mechanical Engineering Congress and Exposition

PB - AMER SOC MECHANICAL ENGINEERS

T2 - ASME International Mechanical Engineering Congress and Exposition

Y2 - 9 November 2012 through 15 November 2012

ER -

SIMULATIONS OF DROPLET COLLISIONS IN SHEAR FLOW

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Conference

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