Vibration generating unit and vibration treating system

Claim 1

A WHISTLE-TYPE VIBRATION GENERATOR COMPRISING A PLURALITY OF STACKED PLATES, ALIGNED OPENINGS IN SAID PLATES DEFINING A DUCT THROUGH THE STACK, MEANS FOR DISCHARGING FLUID UNDER PRESSURE THROUGH SAID DUCT, CUTOUTS IN EACH OF AT LEAST A SET OF FIRST PLATES OF THE PLURALITY COMMUNICATING WITH THE OPENING THEREIN AND DEFINING A FLUID FLOWPATH IN EACH FIRST PLATE, SAID FLOWPATH INTERSECTING ITSELF AT LEAST AT ONE POINT AND INCLUDING AT LEAST ONE LOOPED FLOW PORTION FOR PROVIDING VIBRATION-CREATING INTERACTION BETWEEN DIFFERENT PORTIONS OF SAID FLUID IN THE FLOWPATH, AND ALIGNED INDENTATIONS IN ALL OF SAID STACKED PLATES DEFINING A GROOVE ACROSS A FACE OF THE STACK, THE INDENTATIONS PROVIDED ON SAID FIRST PLATES BEING CONNECTED WITH SAID CUTOUTS TO PROVIDE OUTLETS WHEREBY ON DISCHARGE OF FLUID THROUGH SAID DUCT VIBRATIONS WILL BE CREATED IN THE FLOWPATHS OF ALL SAID FIRST PLATES AND ALL SAID VIBRATIONS WILL BE RADIATED OUTWARDS THROUGH SAID OUTLETS TO COMBINE THEIR ACTIONS ALONG A LINE EXTENDING EXTERIORLY OF THE STACK PARALLEL TO SAID GROOVE.