Heat transfer process in the collision of high-temperature aluminum droplets with an inclined wall

Abstract

The heat transfer process occurring when high-temperature aluminum droplets collide with a solid surface is investigated via numerical simulation and experimentation. The wall temperature at the impact point rapidly increases, with some oscillations, reaching a maximum value of 1054.5 K. The maximum wall heat flux density during the droplet–wall collision is 63,135 kW/m2. As the droplet spreads on the wall, the temperature at the impact point undergoes a two-stage decrease: a rapid decrease followed by a slow decrease. During the initial stage of the droplet–wall collision, the wall temperature is asymmetrically distributed, with the increase in temperature at the advancing edge spreading more slowly than that at the receding edge. Similarly, the corresponding heat flux density distribution at that time is also asymmetrically distributed, with higher heat flux density at the trailing edge of the spread than at the leading edge.