磁性流体と弾性膜の連成分散性波動〔流体工学, 流体機械〕

The transportation mechanism of fluids and/or solid films proposed in the previous papers is achieved by coupled waves which propagate along a thin elastic membrane covering a magnetic fluid layer in a shallow and long rectangular vessel. In order to control the propulsion system and to improve its efficiency, it is necessary to adjust the frequency and wavelength of waves by considering the dispersion relation of the coupled system consisting of a magnetic fluid layer and an elastic membrane. In this paper, transient coupled waves generated by applying external impulsive magnetic forces on the concentrated small region of the magnetic fluid layer are investigated experimentally and partly analytically. Various dispersive waves observed depend on the geometrical and physical parameters such as density of the magnetic fluid, depth of the fluid layer, and kind and thickness of the membrane.