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