spirillation

Spirillation is a fluid dynamic phenomenon where a liquid or gas stream twists into a spiral or corkscrew shape as it moves. This occurs due to instabilities or interactions between the flow and surface features, causing the stream to develop a helical pattern instead of flowing straight. Spirillation can be observed in various contexts, such as in industrial nozzles, natural water flows, or in certain biological processes. Understanding spirillation helps engineers optimize fluid systems for better mixing, efficiency, or control by managing these swirling flow patterns.