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THE stability of mixing between two streams which are initially concentric and fully developed laminarly is a problem of fundamental interest in fluid mechanics. The problem is an original one. The configuration is similar to that which occurs in axi-symmetrical, enclosed laminar diffusion flames. In the case of the flame, however, mixing between the reactants, that is, both exchange of momentum and chemical mixing, is accelerated by strong temperature gradients.

As part of an investigation aimed at a fuller understanding of the operation of electrical probes in low-pressure flame plasmas, free electron temperatures were determined applying the symmetrical floating double probe technique of Johnson and Malter1.

IN a recent investigation into the behaviour of square-edge circular orifices a well-defined hysteresis in the now was measured. This was obtained with air for a number of orifices of different diameters but of the same length/ diameter ratio, equal to one-half. The experimental measurements were made under carefully controlled conditions and could be reproduced at different times.