How is quality of fog improved by providing teeth on nozzle outlets?

Providing teeth on the nozzle outlet serves two purposes; first, in the narrow fog position, it deflects part of the water to the centre of the spray (which is otherwise hollow). Secondly, in the wide fog position, it caused the water curtain to break up into streams which then impinged on one another to create a better quality fog. A variety of different designs of teeth (fixed/ spinning/ flexible) can be used to create this fog.

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