Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 29, 2018 - November 30, 2018
When droplets impact on a heated wall at sufficient high temperature, droplets can levitate owing to vapor stream generated by droplet evaporation in the vicinity of the heated wall. This levitating phenomenon of impacting droplet is known as the Leidenfrost effect, and it is reported that the occurrence of the Leidenfrost effect is affected by wettability of the solid surface. We investigated the levitating mechanism of the impacting droplet on heated wall by using molecular dynamics (MD) simulation. In this MD study, we changed wettability of the solid wall by varying the liquid-solid intermolecular force to investigate influence of wettability on the occurrence of the Leidenfrost effect. We found that the strong intermolecular force led large amount of evaporation of the impacting droplet. As the intermolecular force became stronger, the droplet could levitate easier because of the intensive evaporation in the vicinity of the three-phase contact line on the heated wall.
