Heat transfer characteristics of micro-droplet impacting on high-temperature wall in pyrolysis of methyl ricinoleate

The rapid heating of the material is a key factor in the pyrolysis of methyl ricinoleate, which is mainly affected by the droplet size and velocity of methyl ricinoleate droplet impacting on high temperature wall. The process of millimeter-droplet of methyl ricinoleate impacting on high temperature wall at different droplet sizes and velocities were studied by high-speed photography technology and multiphysics simulation. The simulation results were basically consistent with the experimental results. Based on this model, the process of micro-droplet impacting on high temperature wall was investigated, obtaining the heat rates of droplet at different droplet sizes and velocities. The processes of 38~58 ?m droplet impacting on high temperature wall at velocity of 10~30 m/s were investigated. As the droplet at the initial temperature of 27?C and droplet size of 38 ?m impacting on a high temperature wall of 480?C at a speed of 20 m/s, the average heating rate of the droplet reached 10? per second orders of magnitude. The results showed that faster heating rates were obtained at smaller droplet size and faster droplet velocity. Hence, the rapid heating of the material can be achieved by the micro-droplet impacting on stable high temperature wall.