【摘 要】
:
Outcomes from an isothermal drop impact without phase change are determined by the impact parameters, impact velocity, liquid viscosity and surface tension,
【机 构】
:
InstituteofFluidMechanicsandAerodynamic,TechnischeUniversit(a)tDarmstadt,Germany
【出 处】
:
13th International Conference on Liquid Atomization and Spra
论文部分内容阅读
Outcomes from an isothermal drop impact without phase change are determined by the impact parameters, impact velocity, liquid viscosity and surface tension, and substrate morphology and wettability. For example, at low Weber number impacts on hydrophobic and superhydrophobic surfaces a partial or total rebound of the impinging droplet can be observed, while higher impact velocities can lead to drop splash, characterized by generation of secondary drops. In many applications drop impact onto hot wall leads to the appearance of Marangoni effects, nucleate or film boiling. Thereby it is important to better understand the influence of the wall temperature on the drop impact outcome. The main focus of this experimental study is the characterization of the hydrodynamic outcome of the interaction between the droplet and the hot surface. The drop impact phenomena have been observed and characterized using a high-speed video system. Liquid viscosity, impact velocity, drop diameter, surface temperature and surface material have been varied in the experiments. Various hydrodynamic regimes at different wall temperatures and impact parameters were identified: Deposition, partial rebound, total rebound and atomization. The maps of the hydrodynamic regimes are quantified and modelled.
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