Mining or in situ disintegration of hard material – Processes – Breaking down by direct contact with fluid
Patent
1978-04-07
1980-03-18
Purser, Ernest R.
Mining or in situ disintegration of hard material
Processes
Breaking down by direct contact with fluid
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
Hochrein, Jr. Ambrose A.
Thiruvengadam Alagu P.
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