Improved mineral excavation nozzle design study.
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, J0255024, 1976 Apr; :1-104
The objective of this program was to develop nozzle designs to maximize the effective cutting length of a water jet. The program supports the Bureau of Mines borehole mining program, which requires turning the flow by 90 deg and accelerating through a nozzle within a restricted length (or borehole radius). The design technique developed is computationally economical, and from these criteria, six flow conditions including pressures to 4,500 psi and flow rates to 400 gpm were examined. The best shape for a borehole mining application consists of an initial fourth degree polynomial (quartic) at the entrance followed by a straight section with a 20 deg (half-angle) taper at the exit. The techniques developed were used to analyze the performance of a water jet as a function of flow conditions. For a borehole mining application, an operating stagnation pressure of about 2,000 psi is recommended.
Nozzles; Hydraulic mining; Hydraulic jets; Jet flow; Cutting; Boreholes; Drilling; Hydraulic mining; Nozzle design; Design criteria; Flow conditions; Flow analysis
CP; Final Contract Report
NTIS Accession No.
OFR 33-77; Contract-J0255024
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, J0255024
TRW Systems and Energy, Redondo Beach, California