In this paper reports are given on laser‐Doppler velocimeter measurements on counterflowing water streams with swirl. The experiments lend qualitative support to previous theory and computations [Goddard, Didwania, and Wu, J. Fluid Mech. 251, 149 (1993)] of the effects of swirl and confinement on the hydrodynamic stability of this flow in the high‐Re regime. In the present paper a linear stability analysis and computations of the marginal stability curve for self‐similar, radially unconfined flows are also given. This and the above‐cited work serve to define the practical operating limits on an associated flow device for generating a uniformly accessible interface of mass or heat transfer between counterflowing fluid streams.
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