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Improved Mineral Excavation Nozzle Design Study.


PB264138

Publication Date 1976
Personal Author Lohn, P. D.; Brent, D. A.
Page Count 109
Abstract The objective of the 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 degrees and accelerating through a nozzle within a restricted length (or borehole radius). The design technique developed is computationally economical and from this criteria six flow conditions including pressures to 4,500 psi and flow rates to 400 gpm were examined. The best shape for a borehold mining application consists of an initial fourth degree polynomial (quartic) at the entrance followed by a straight section with a 20 degree (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.
Keywords
  • Nozzles
  • Hydraulic mining
  • Design
  • Hydraulic jets
  • Jet flow
  • Analyzing
  • Cutting
  • Boreholes
  • Drilling
Source Agency
  • Bureau of Mines
NTIS Subject Category
  • 48A - Mineral Industries
  • 94I - Hydraulic & Pneumatic Equipment
Corporate Authors TRW Systems and Energy, Redondo Beach, Calif.; BUREAU OF Mines, Washington, D.C.
Document Type Technical Report
Title Note Interim rept. Jul 75-Mar 76.
NTIS Issue Number 197711
Contract Number
  • J0255024
Improved Mineral Excavation Nozzle Design Study.
Improved Mineral Excavation Nozzle Design Study.
PB264138

  • Nozzles
  • Hydraulic mining
  • Design
  • Hydraulic jets
  • Jet flow
  • Analyzing
  • Cutting
  • Boreholes
  • Drilling
  • Bureau of Mines
  • 48A - Mineral Industries
  • 94I - Hydraulic & Pneumatic Equipment
  • J0255024
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