Chai, A., Dept. of Fluid Mechanics and Heat Transfer, Faculty of Engineering, Tel-Aviv University, Tel-Aviv, Israel
Kit, E., Dept. of Fluid Mechanics and Heat Transfer, Faculty of Engineering, Tel-Aviv University, Tel-Aviv, Israel
Tanny, J., Center for Technological Education Holon, P.O.B. 305, Holon, Israel

Two flow visualization techniques, the shadowgraph and the hydrogen bubbles, are combined to facilitate simultaneous observation of the vertical velocity profile and the density interfaces in a stratified mixing layer in an annulus. The experimental setup is described and some examples of the resulting photographs are presented and discussed. © 1990 Springer-Verlag.