Simulation on Thermocapillary-Driven Drop Coalescence by Hybrid Lattice Boltzmann Method

Haiqiong Xie, Zhong Zeng, Liangqi Zhang, Yuui Yokota, Yoshiyuki Kawazoe, Akira Yoshikawa

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


A hybrid two-phase model, incorporating lattice Boltzmann method (LBM) and finite difference method (FDM), was developed to investigate the coalescence of two drops during their thermocapillary migration. The lattice Boltzmann method with a multi-relaxation-time (MRT) collision model was applied to solve the flow field for incompressible binary fluids, and the method was implemented in an axisymmetric form. The deformation of the drop interface was captured with the phase-field theory, and the continuum surface force model (CSF) was adopted to introduce the surface tension, which depends on the temperature. Both phase-field equation and the energy equation were solved with the finite difference method. The effects of Marangoni number and Capillary numbers on the drop’s motion and coalescence were investigated.

Original languageEnglish
Pages (from-to)67-77
Number of pages11
JournalMicrogravity Science and Technology
Issue number1
Publication statusPublished - 2016 Apr 1


  • Drop coalescence
  • Lattice Boltzmann method
  • Microgravity
  • Thermocapillary flow
  • Two-phase


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