Controlled cavitation erosion process and system

Mining or in situ disintegration of hard material – Processes – Breaking down by direct contact with fluid

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134 1, 175 67, E21C 2560, B08B 312

Patent

active

041936353

ABSTRACT:
A process and apparatus for high speed material removal with relatively low specific energy input requirements are disclosed. The apparatus includes a system for supplying pressurized fluid at a predetermined flow rate and pressure to an orifice of predetermined diameter. The system establishes a fluid flow to an environment in which there exists cavitation downstream of the orifice. The orifice size, position relative to the surface being treated, the fluid velocity and fluid pressure are determined with reference to the erosion strength of the particular parent material to be removed so as to effect highly efficient rapid cutting, drilling, cleaning and the like. The process includes the generation of a cavitation-free fluid flow through the orifice such that a submerged cavitating flow field is established downstream of that orifice. The velocity of fluid flowing through the orifice is selected to provide a cavitation intensity which exceeds the threshold erosion intensity of the material to be removed. As the cavitation bubbles collapse, the material is removed to selectively clean, cut or drill, as required.

REFERENCES:
patent: 3373752 (1968-03-01), Inoue
patent: 3713699 (1973-01-01), Johnson
patent: 4081200 (1978-03-01), Cheung

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