  In this paper, the droplet impact dynamic behavior of droplet on
Janus-textured heated substrates is numerically investigate by using the
thermal Lattice Boltzmann method. The effect of several factors like the
wettability, the Jakob number and the Weber number on the droplet impact
dynamic behavior on Janus-textured heated surface are studied in detail. The
simulation results show three types of boiling states, i.e., contact boiling,
transition boiling and film boiling. The droplets in contact boiling state
directionally migrate toward the denser region, while the droplets move toward
the sparser region for film boiling state at low Weber number, which agrees
with the direction of droplet motion in experiments [Zhang et al., Adv. Funct.
Mater., 2019, 29, 1904535]. The self-propelled droplets on the Janus-textured
heated substrates is owning to unbalanced Young's fore, vapor pressure
difference and thermophoretic force. Moreover, The Janus-textured surface with
low wettability has superior nucleation behavior resulting in their typically
easy transition from efficient transition boiling state to inefficient film
boiling state. In addition, the boiling states of the droplet change from the
contact boiling state to the transition boiling state and then to the film
boiling state as the Jakob number increases.
