| Description |
vii, 88 leaves : illustrations ; 29 cm |
| Summary |
"Three experiments are described that investigate the impingement of high pressure water jets on rock. The effect of jet pressure, stand-off distance, and time of impact on penetration and specific energy of rock removal are determined on Berea sandstone, Georgia marble, and Missouri granite. Pressures range from 5,000 psi to 25,000 psi, stand-off distances from 2.0 inches to 4.0 inches and time from 0.1 seconds to 5.0 seconds. The nozzle diameter used was 0.023 inches. The effect of nozzle speed and number of passes over the same area on depth of cut and specific energy are investigated on the above rock types and Indiana limestone using a continuous jet. The speed varied from 1.2 in/min to 561 ft/min and the number of passes from 1 to 16. The distance between adjacent cuts for complete rib removal by water jet action alone is determined for the 0.023 inch nozzle. The effect of nozzle diameter on penetration and specific energy is studied using both the continuous jet and the water cannon with pressures ranging up to 47,000 psi. The nozzle diameters vary from 0.023 inches to 1.0 inches"--Abstract, leaf iii. |
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