This study investigates the behavior of a liquid layer heated from below, resulting in a Marangoni-driven flow, with a specific focus on the effect of parametric forcing on this flow. Long-wave Marangoni instabilities leading to dry-out in thin liquid films are addressed, with findings suggesting that parametric forcing can mitigate dry-out in long-wave instabilities. Through computational analysis utilizing linear stability and nonlinear models, it is observed that at low forcing frequencies, the liquid film can be stabilized within a finite range of amplitudes, decreasing with increasing frequency. Beyond this range, instability arises, either from Marangoni or resonant effects. While linear stabilization cannot be achieved at high forcing frequencies, a nonlinear saturation mechanism effectively suppresses surface deformation, preventing dry spot formation. Similar stability trends are identified in viscoelastic fluids, albeit with parametric forcing destabilizing Marangoni instability at very low frequencies. Nonetheless, stabilization is attainable within an intermediate frequency range.
Accès Salle des séminaires FAST-LPTMS (Bât. 530, salle C.120, 1er)