  The size distribution of child droplets resulting from a dual-bag
fragmentation of a water drop is investigated using shadowgraphy and digital
in-line holography techniques. It is observed that parent drop fragmentation
contributes to the atomization of tiny child droplets, while core drop
disintegration predominantly results in larger fragments. Despite the
complexity associated with dual-bag fragmentation, we demonstrate that it
exhibits a bi-modal size distribution. In contrast, the single-bag breakup
undergoes a tri-modal size distribution. We employ the analytical model
developed by Jackiw and Ashgriz (2022) for dual-bag fragmentation that
convincingly predicts the experimentally observed droplet volume probability
density. We also estimate the temporal evolution of child droplet production in
order to quantitatively illustrate the decomposition into initial and core
breakups. Furthermore, we confirm that the analytical model adequately predicts
the droplet size distribution for a range of Weber numbers.
