Document Type
Thesis
Date of Award
5-31-1989
Degree Name
Master of Science in Mechanical Engineering - (M.S.)
Department
Mechanical and Industrial Engineering
First Advisor
E. S. Geskin
Second Advisor
Avraham Harnoy
Third Advisor
Rong-Yaw Chen
Abstract
This study is concerned with the distribution of abrasive particles within an abrasive waterJet. The Jet is generated by the Ingersoll Rand nozzle set at the different diameters of the sapphire nozzles and carbide mixers. Water pressure is maintained at 4.7- 4.9 ksi.
The distribution of particles is examined by the separation of the central and adjacent part of the flow and the measurement of the fractions of the mixture and abrasive in the separated region. The separation is carried out by diamond washers coaxial with a carbide mixer. The second series of experiments involve the estimation of the Jet diameter and subsequent estimation of the distribution of water and particles flow along the diameter. These evaluation are carried out by the separation of the part of the flow at the different points of ]et.The performed experiments enable us to evaluate the anatomy of water-particles flow used for abrasive water jet cutting. At the core of the jet, the flow is the homogeneous water-particles mixture. Mean flow rate reduces from the center to the core periphery. Part of particles are not entrained by the water Jet and remained outside of the core. The observed peculiarities are held for the different condition of jet and jet formation.
Because of this, the principal objective of this study is to developo a practical experimental procedure and to acquire a database describing the jet structure. The obtained informations can be used to construct the phenomenal logics and the mathematical models of the abrasive water jet cutting as well as for the improvement of process. The developed experimental procedure can be used for the setting and alignment of the water jet cutting facilities.
The preliminary analysis of the acquired information determine some principal features of the jet. It is found that the mainstream of the jet is formed by the uniform flow of particles and water. The density of this flow is almost constant within the mainstream. Outside of the mainstream, the ratio of the particles to water increases perhaps due to the loss of some particles.
Total 15 different sets of combination are carried in this experiment and the acquired informations will be used in the understanding of jet formation and optimized the cutting conditions.
Recommended Citation
Kim, Sun, "Investigation of the distribution of particles in an abrasive water jet" (1989). Theses. 2818.
https://digitalcommons.njit.edu/theses/2818
