This paper focuses on the influence of self-conversion and capture processes on the stability of close clouds cells in absence of gravity. Evidence is given that self-conversion is a stabilizing mechanism, whereas the capture process leading to droplets growth is destabilizing. Furthermore, both the analytical and numerical computation permitted to parameterize the processes and investigate the antagonist effects of the self-conversion and the capture processes on the flow stability. Along with this competition between the processes to impact the flow stability during the cloud movement, the stability diagram reveals the presence of a bifurcation curve in the mixing ratio plane representation similar to those found in Rayleigh-Bénard or Fredericks or else Brün-Väisälä mechanisms.

clouds, mixing ratio, self-conversion, capture, stability.