Abstract

The flow of a liquid film sheared by gas stream in a horizontal rectangular bent duct was investigated using a high-speed camera. Compared to the straight horizontal duct condition, the local gas-phase velocity distribution in the bend and the effects of interactions such as reflections of waves impinging on the wall remain unknown. In this study, we investigate the unique scattering and splitting behavior that occurs at the bend by varying the gas-phase flow velocity and the bend angle of the rectangular duct. Specifically, Bag breakup was quantitatively evaluated using We number and compared with Bag breakup generated from a single droplet using characteristic time t*bk. The results showed that Bag breakups were unevenly distributed due to bend effects, and the We number varied depending on the location of the Bag breakup. It was also found that the possible range of the characteristic time of bag breakup was smaller than that of a single droplet.

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