Aerodynamic Rupture of Bulged Liquid Sheet
摘要
In this research article, a moving bulged sheet atomizes under aerodynamic loading is experimentally studied. The rupture of liquid sheets is apprehended using direct high-speed photography. The aerodynamic force is generated using a jet facility. The pressure difference across the stagnation region of the sheet and the velocity difference near the plateau border region generate an antisymmetric and symmetric perturbation wave. The bulged sheet ruptures after it attains a metastable state. The spatiotemporal investigation of the bulged sheet is performed at different Weber numbers. The ruptured sheet recedes and collects liquid from the upstream of the sheet to form the rim which further destabilizes to shed droplets via ligament-mediated breakup. The bond number of the sheet rim is found to be the order of unity. The time scale of droplet ejection from the ligament is consistent with the Rayleigh-Plateau time scale. Using the Taylor–Culick relation, it is found that the thickness of the sheet increases from the front to the plateau border, and this results in the reduction of receding velocity.