| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 97 === An investigation in droplet-film collision is experimentally conducted. The phenomena of a drop impinging upon a liquid layer are categorized into five characteristics including absorption, central jet, secondary droplet, multiple droplets, and closed crown. Four regime thresholds are defined to segregate these five characteristics. By changing the viscosity and the surface tension of the fluids, a peninsular trend is summarized, which describes the behaviour of these specific thresholds. The sheeting-splashing threshold is postponed when the viscosity of the fluid is increased, and is advanced if the surface tension of the solution is decreased. Moreover, the material effect on the droplet-film collision is discussed. The turning point of each threshold arises with higher Weber number when the aluminum plate is replaced for the acrylic plate.
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