@article{oai:nagoya.repo.nii.ac.jp:02005406, author = {Zhang, Jiawen and Sato, Takaya and Ooyama, Takeshi and Koumura, Keiji and Ito, Takahiro and Tsuji, Yoshiyuki}, journal = {Experimental Thermal and Fluid Science}, month = {Feb}, note = {Although numerous studies have investigated droplets in shear flows, the features of these droplets are incompletely understood. This paper reports our experimental visualization results of sessile droplets in fully developed turbulent shear flows and the onset of their movement. The visualization was performed from the side and bottom views. Furthermore, the droplet height is much smaller than the boundary-layer thickness, and the droplet motions are strongly affected by turbulent velocity fluctuation. The droplets were deformed toward the front and spread in a spanwise direction. The front and rear-side contact angles recover the balance position, that changes symmetrically over time and are not clearly related to sessile droplet oscillation. The droplet oscillation frequencies were well predicted by the model based on the resonant vibrations of the standing waves except for the lowest mode. Based on the critical air velocity and droplet height, the motion onset was adequately approximated by a simple empirical relation between the Weber and Reynolds numbers.}, title = {Observation of water droplet motion in a shear flow}, volume = {141}, year = {2023} }