Flow-Induced Wave Generated on a Thin Film under Corrugation

Abstract

This paper deals with an experimental study of flow-induced wave generated on a thin film under shear loading. The experiment is carried out to investigate the deformed shape of the thin film with various values of shear loading, and the wave propagation due to the interaction of the deformed shape of the thin film with the fluid flow in the narrow passage. As a result, it is clarified that the flow-induced wave occurs to the thin film caused by the interaction of the deformed shape of the corrugation due to the shear loading with the fluid flow in the narrow passage. The critical flow velocity of the flow-induced wave drastically decreases caused by the generation of the corrugation on the thin film due to shear loading. Moreover, it is clarified that the traveling direction of the flow-induced wave is determined by the deformed shape of the corrugation and fluid flow direction. The flow-induced wave propagates diagonally, almost across the fluid flow direction.