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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

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