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The impact of droplets on liquid pools is ubiquitous in nature and manyindustrial applications. Most previous studies of droplet impact focus onNewtonian fluids, while less attention has been paid to the impact dynamics ofnon-Newtonian droplets, even though non-Newtonian fluids are widely used inmany applications. In this study, the splashing dynamics of shear-thinningdroplets with yield stress are studied by combined experiments and simulations.The formation and the propagation of the ejecta sheet produced during thesplashing process are considered, and the velocity, the radius, and the time ofthe ejecta sheet emergence are analyzed. The results show that thenon-Newtonian fluid properties significantly affect the splashing process. Theejecta sheet of the splashing becomes easier to form as the flow index reduces,the large yield stress can affect the thickness of the ejecta sheet, and thespreading radius collapses into a geometrical radius due to that the inertiaforce is the dominant factor in the ejecta sheet propagation.

Droplet splashing during the impact on liquid pools of shear-thinning fluids with yield stress