  Condensation and frost formation degrade the heat transfer performance of
air-conditioners and refrigerators. Yet, the frost formation mechanism has not
been fully understood. In the present study, we numerically investigated H2O
droplets during cooling and ice formation by means of classical molecular
dynamics simulations. The mW potential was employed for the H2O molecules. A
nanoscale H2O droplet was placed on a flat solid wall consisting of Pt atoms.
The fcc (110) crystal plane faced the droplet. We examined where ice nucleation
was formed and how the ice formation proceeded inside the droplet, and then
evaluated temporal change in interfacial thermal resistance between the H2O
molecules and the solid wall. We found that the cooling and ice formation
changed the interfacial thermal resistance; however, its tendency differed
depending on the solid-wall wettability. It was influenced by the nearest
neighbor adsorption layer consisting of H2O molecules transformed during the
cooling and ice formation.
