Coupled Electrohydrodynamic and Thermocapillary Instability of Multi-Phase Flows Using an Incompressible Smoothed Particle Hydrodynamics Method

This paper concerns the study of coupled effects electrohydrodynamic (EHD) and thermocapillary (TC) on dynamic behaviour a single liquid droplet. An incompressible Smoothed Particle Hydrodynamic (ISPH) multiphase model is used to simulate EHD-TC driven flows. The complex hydrodynamic interactions are modeled using continuum surface force (CSF) method, in which gradient interfacial tension Marangoni forces calculated with an approximated error or 0.014% calculation compared analytical solutions significant improvement comparison previous SPH simulation studies, under assumption that thermocapillarity generates sufficiently large stress allow droplet migration, while phenomena influences morphology depending electrical thermal ratios ambient fluid. shows that, when applying vertical electric field gradient, starts stretch horizontally towards break-up condition at high rate permitivity. combined effect tends push further regime. When vector orthogonal, results show deformation would take place more slowly cause migrate, stretching direction not seen be as strong first case.