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By S. D. Myers

Booklet by way of S. D. Myers, J. J. Kelly, R. H. Parrish

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It is the characteristic of the gas particle flow to have coupling between the phases. Momentum coupling results in the aerodynamic drag for particle motion. Spray issuing into quiescent gas exemplifies the thermal coupling. Effect of drag coefficient on flow. As a first approximation, treating the particle as a sphere,various factors influencing the drag coefficient can be studied. Then by considering the compressibility effects, rotation of the particles, free stream turbulence if Reynolds number of particle is near its critical value, surface roughness of particles, rarefaction effects if the diameter of the particle is of the order of the mean free path of the gas in which it moves, and the heat transfer rate of the particle, modification to the drag coefficient can be made.

Rmu1u and M. 23-32. Hashish, M. (1989b) "A Model of Abrasive-Waterjet Machining," ASME Transactions, Journal of Engineering Materials and Technology, Vol. 111, pp. 154-162. Ruff, A. , and Wiederhorn, S. M. (1979) "Erosion by Solid Particle Impact," in Treatise on Material Science and Technology: Erosion, Vol. 16, C. M. ), Academic Press, p. 69. Shaw, M. C. (1972) "A New Theory of Grinding," Mechanical and Chemical Engineering Transactions of the Institution of Engineers, Australia, Vol. 1, May, pp.

University of Nebraska, Lincoln. ACKNOWLEDGMENTS This work was supported by the National Science Foundation under SBIR award number ISI-8860750. The author is grateful to this support. The support of Flow International in preparing this paper is also greatly appreciated. JEITING BASICS - FLUID MECHANICS ATTENUATOR'S VOLUME INFLUENCE ON HIGH PRESSURE'S PULSATIONS IN A JET CUTTING UNIT ROMEO SUSAN-RESIGA Technical University of Timisoara Bd. l, 1900 Timi~oara, ROMANIA ABSTRACT In this paper, a mathematical pattern for determination of evolution in time of pressure before the nozzle is developed for a jet cutting unit by taking into account the fluid compressibility.

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