SYMPOSIA PAPER Published: 01 January 1979
STP35815S

A Study of Erosion by High-Pressure Cavitating and Noncavitating Waterjets

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A study was made of erosion by high-pressure noncavitating and cavitating waterjets issuing from five different arrangements of nozzles, consisting of (A) jet in air, (B) submerged jet, (C) jet surrounded by another of lower velocity, (D) jet from long nozzles, and (E) jet from a nozzle containing a cylindrical body insert. The purpose was to evaluate the two methods of erosion for jet cutting applications.

Simple visual examination of the craters on specimens of copper showed distinct type (size, shape, depth, etc.) of erosion. However, microscopic examination did not reveal clearly any characteristics peculiar to cavitating or noncavitating jets.

Quantitative experimental results were obtained by measuring the mass loss of lead specimens as a function of time of exposure for the conditions where either the nozzle pressure or the standoff distance was held constant. By comparing the different arrangements on the basis of material loss, it is concluded that Arrangement B performed best for all periods of exposure and standoff distances followed by Arrangement C for short periods of exposure, smaller standoff distance, and for certain flow conditions.

Author Information

Vijay, MM
Gas Dynamics Laboratory, Mechanical Engineering Division, National Research Council of Canada, Ottawa, Ontario, Canada
Brierley, WH
Gas Dynamics Laboratory, Mechanical Engineering Division, National Research Council of Canada, Ottawa, Ontario, Canada
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Details
Developed by Committee: G02
Pages: 512–529
DOI: 10.1520/STP35815S
ISBN-EB: 978-0-8031-4737-9
ISBN-13: 978-0-8031-0334-4