Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Improved mineral excavation nozzle design study.

Authors
Lohn-PD; Brent-DA
Source
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, J0255024, 1976 Apr; :1-104
Link
NIOSHTIC No.
10001596
Abstract
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.
Keywords
Nozzles; Hydraulic mining; Hydraulic jets; Jet flow; Cutting; Boreholes; Drilling; Hydraulic mining; Nozzle design; Design criteria; Flow conditions; Flow analysis
Publication Date
19760401
Document Type
CP; Final Contract Report
Fiscal Year
1976
NTIS Accession No.
PB-264138
NTIS Price
A07
Identifying No.
OFR 33-77; Contract-J0255024
NIOSH Division
TCRC; WO
Source Name
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, J0255024
State
MN; CA; DC
Performing Organization
TRW Systems and Energy, Redondo Beach, California
TOP