A study of a new interfacial instability between two vertical fluid layers of different densities

수직평판 사이를 흐르는 두 점성유체의 밀도차에 의한 계면의 새로운 불안정성 연구

A new interfacial instability between two vertical fluid layers of different densities is studied. The two layers are flowing between two parallel vertical plates vertically upward or downward, forming counter- or concurrent flows. In order to extend the study to highly-nonlinear regime in future studies, a nonlinear interface evolution equation is derived, and the stability analysis is performed based on the evolution equation. Among the parameters studies are the ratios of the fluid densities and layer thicknesses and the net flow rate.