SIMULATIONS OF DROPLET COLLISIONS IN SHEAR FLOW

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

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference 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 languageEnglish
Title of host publicationProceedings of ASME 2012 International Mechanical Engineering Congress and Exposition
Subtitle of host publicationMicro- and Nano-Systems Engineering and Packaging, Parts A and B
PublisherAMER SOC MECHANICAL ENGINEERS
Pages645-652
Number of pages8
Volume9
ISBN (Print)978-0-7918-4525-7
DOIs
Publication statusPublished - 2013
EventASME International Mechanical Engineering Congress and Exposition - Houston
Duration: 9 Nov 201215 Nov 2012

Conference

ConferenceASME International Mechanical Engineering Congress and Exposition
CityHouston
Period9/11/1215/11/12

Keywords

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

Cite this

Shardt, O., Derksen, J. J., & Mitra, S. K. (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, pp. 645-652). AMER SOC MECHANICAL ENGINEERS. https://doi.org/10.1115/IMECE2012-87106

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 proceedingConference 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
Shardt O, Derksen JJ, Mitra SK. 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. 2013. p. 645-652 https://doi.org/10.1115/IMECE2012-87106
Shardt, Orest ; Derksen, J. J. ; Mitra, Sushanta K. / SIMULATIONS OF DROPLET COLLISIONS IN SHEAR FLOW. 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. pp. 645-652
@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.",
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 - 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

ER -