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ICLASS 94<br>Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems

ISBN:
978-1-56700-019-1 (Print)
978-1-56700-445-5 (Online)

ENTRAINMENT BY EFFERVESCENT SPRAYS AT LOW MASS FLOW RATES

S. G. Bush
Maurice J. Zucrow Laboratories, School of Mechanical Engineering, Purdue University, West Lafayette, Indiana, USA

Paul E. Sojka
Maurice J. Zucrow Laboratories (formerly Thermal Sciences and Propulsion Center), School of Mechanical Engineering, Purdue University, West Lafayette, Indiana, 47907-2014, USA

Abstract

A model of entrainment based on j et momentum flux that provides useful results at moderate values of GLR is presented An entrainment number of approximately 0.15, obtained for air and a 0.040 Pa-s hydrocarbon oil, provides a good estimate of entrainment by an effervescent spray as a function of axial distance, liquid mass flow rate, liquid, atomizing gas and entrained air densities, and nozzle gas-to-liquid ratio when using Ishii's slip ratio correlation. The results also indicate that substantial inaccuracies arise when attempting to extend Ishii's expression to fluids with viscosities of 0.100 Pa-s, thus illustrating that a correct value of slip ratio is necessary if accurate predictions are to be obtained.