Tanny, J., Chai, A. (1991)
Hydrogen Bubble Visualization of a Sheared Density Interface, Experiments in Fluids, 10(5), pp. 296-298.

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ABSTRACT
The instability of a sheared density interface and the resulting turbulence were the subjects of many experimental studies owing to their importance for the understanding of mixing processes in various stratified flows in nature and technology. In these experiments many efforts were made to vusualize the local flow patterns, in an attempt to identify the dominant mode of instability and the mechanism of mixing. In this work, the well known hydrogen bubble technique, so far used for the visualization of velocity profiles across a density interface, is modified so that bubbles are released continuously from a small diameter (38 micron) horizontal wire of 0.5 cm active width. Thus a local streak line of bubbles which clearly illustrates the flow patterns is produced without introducing any disturbances. Many flows can be visualized by this method and here we present its application to a stratified shear flow in an annulus.

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