  The interaction of liquid drops and heated surfaces is of great importance in
many applications. This paper describes a numerical method, based on smoothed
particle hydrodynamics (SPH), for simulating n-heptane drop impact on a heated
surface. The SPH method uses numerical Lagrangian particles, which obey the
laws of fluid dynamics, to describe the fluid flows. By incorporating the
Peng-Robinson equation of state, the present SPH method can directly simulate
both the liquid and vapor phases and the phase change process between them. The
numerical method was validated by two experiments on drop impact on heated
surfaces at low impact velocities. The numerical method was then used to
predict drop-wall interactions at various temperatures and velocities. The
model was able to predict the different outcomes, such as rebound, spread,
splash, breakup, and the Leidenfrost phenomenon, consistent with the physical
understanding.
