  A theoretical analysis of binary collisions of quantum droplets under
feasible experimental conditions is reported. Droplets formed from degenerate
dilute Bose gases made up from binary mixtures of ultra cold atoms are
considered. Reliable expressions for the surface tension of the droplets are
introduced based on a study of low energy excitations of their ground state
within the random phase approximation. Their relevance is evaluated considering
an estimation of the expected excitation energy having in mind the Thouless
variational theorem. The surface tension expressions allow calculating the
Weber number of the droplets involved in the collisions. Several regimes on the
outcomes of the binary frontal collisions that range from the coalescence of
the quantum droplets to their disintegration into smaller droplets are
identified. Atoms losses of the droplets derived from self-evaporation and
three-body scattering are quantified for both homo- and hetero-nuclear
mixtures. Their control is mandatory for the observation of some interesting
effects arising from droplets collisions.
