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System 2: Deformation Dynamics of Liquid Droplet in Collision with a Particle with Film-Boiling Evaporation The phenomena of evaporative liquid droplets impacting onto solid objects at high temperatures are of relevance to many engineering problems, such as sprinkler systems in the iron making or metal-casting processes, ink-jet spraypainting, impingement of oil droplets on turbine engines, meteorology, and spray coating of substrates. , 2001) and microelectronic materials manufacturing. In FCC riser reactors, for example, gas oil at a low temperature is injected into the riser from feed nozzles located at the bottom of the riser and the mist droplets formed from the spray contact with high-temperature ﬂuidized catalyst particles.
The simulation of this study is conducted for cases with different Weber numbers, which represent distinct dynamic regimes. The simulation shown in Fig. 3 mm in diameter onto a surface of 4001C with an impact velocity of 65 cm/s, corresponding to a Weber number of 15. This simulation and all others presented in this study are conducted on uniform meshes (Dx ¼ Dy ¼ Dz ¼ D). The mesh resolution of the simulation shown in Fig. 08 mm in grid size, although different resolutions are also tested and the results are compared in Figs.
23. 5-mm particle at 250 1C. Impact velocity V ¼ 45 cm/s. The physical properties of the particle are the same as FCC particles. The simulation is conducted using a 140 Â 140 Â 200 rectangular mesh covering a 7 mm Â 7 mm Â 10 mm computational domain. Both the 3-D images and the temperature ﬁeld are shown in this ﬁgure. It can be seen in this ﬁgure that since the inertia (mass) of the particle is smaller than that of the droplet, the particle velocity decreases rapidly as soon as the particle collides with the droplet.