Etude numerique de la convection thermo-solutale en microgravite sous un champ vibratoire de hautes frequences

摘要

Two-dimensional thermo-solutal convection in a square enclosure under weightlessness condition is studied. The main purpose is to investigate the heat and mass transfer induced by means of vibration in microgravity. The problem is based on the system of equations of the mean fields of velocity, pressure, temperature and concentration. The numerical simulations are made using a spectral Legendre collocation method. A 4-cells convective solution undergoes a bifurcation to a 3-cells flow with symmetry-breaking while the intensity of the vibrationnal field increases. As the vibration's intensity keeps increasing, a Hopf bifurcation occurs. A particular attention is paid on the heat and mass transfer for different Lewis number on the branch of 3-cells solutions.