  One-dimensional numerical simulations based on hybrid Eulerian-Lagrangian
method are performed to study the interactions between propagating shocks and
dispersed evaporating water droplets. Two-way coupling for exchanges of mass,
momentum, energy and vapour species is adopted for the dilute two-phase
gas-droplet flows. Interphase interactions and droplet breakup dynamics are
investigated with initial droplet diameters of 30, 50, 70 and 90 {\mu}m under
an incident shock wave Mach number of 1.3. Novel two-phase flow phenomena are
observed when droplet breakup occurs. First, droplets near the two-phase
contact surface show obvious dispersed distribution because of the reflected
pressure wave that propagates in the reverse direction of the leading shock.
The reflected pressure wave grows stronger for larger droplets. Second, spatial
oscillations of the gas phase pressure, droplet quantities (e.g., diameter and
net force) and two-phase interactions (e.g., mass, momentum, and energy
exchange), are observed in the post-shock region when droplet breakup occurs,
which are caused by shock / droplet interactions. Third, the spatial
distribution of droplets (i.e., number density, volume fraction) also shows
strong oscillation in the post-shock region when droplet breakup occurs, which
is caused by the oscillating force exerted on the droplets.
