An experimental study was carried out on cavitating jets emerging from conical entry and cylindrical nozzles of various sizes. The main interest of the work was directed to the industrial uses of cavitating jets where cavitation had to perform useful work e.g. cleaning or peening. Nozzles with diameter in the range of 1 - 2.5mm were tested at different cavitation numbers and at various upstream and downstream pressures. Extensive photographic studies using high speed flash were done to investigate vortex structures around the jet. Helical cavitating vortices forming single and/or double helices were observed. Static pressure exerted on a target normal to the jet axis were measured. Both single and double helix cavitating vortices were observed. Either direction of rotation could be generated in the same nozzle. Cavitation number σ was a useful correlating parameter for correlating the jet performance. An empirical relationship was produced jet length with cavitation number.
|Number of pages||8|
|Journal||American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED|
|Publication status||Published - 1996|