고체 표면에 충돌하는 점탄성 액적의 동역학적 거동에 대한 수치해석 연구

초록

Droplet impact on solid surfaces plays an important role in inkjet printing, spray coating, food processing, and biomedical applications. Although many studies have investigated Newtonian droplets, practical fluids often exhibit viscoelastic behavior, which makes the spreading dynamics more complex due to the generation and relaxation of elastic stress. In particular, the maximum spreading diameter of a viscoelastic droplet cannot be fully explained by conventional Newtonian-based models. In this study, the impact dynamics of a viscoelastic droplet on a solid surface are investigated using the Level Contour Reconstruction Method combined with the Oldroyd-B constitutive model. The effects of Reynolds number, solvent viscosity ratio, and Weissenberg number on the maximum spreading diameter are examined and compared with Newtonian fluid cases. The results show that the maximum spreading behavior of viscoelastic droplets is not governed solely by Reynolds number or total viscosity, but is also affected by the relative contribution and relaxation behavior of viscoelastic stress.

키워드