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雾化与喷雾
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ISSN 打印: 1044-5110
ISSN 在线: 1936-2684

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雾化与喷雾

DOI: 10.1615/AtomizSpr.v11.i6.10
22 pages

PREDICTING DROP SIZE DISTRIBUTIONS FROM FIRST PRINCIPLES FOR NON-NEWTONIAN FLUIDS

E. Babinsky
Maurice J. Zucrow Laboratories (formerly Thermal Sciences and Propulsion Center), 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

An analytical method for predicting drop size distributions in sprays where primary atomization dominates has been applied to non-Newtonian (viscoelastic) fluids. The method is based on an application of the discrete probability function (DPF) technique to an existing instability analysis of a viscoelastic jet. In the present work, drop size distributions produced by an effervescent atomizer spraying single-phase viscoelastic fluids are predicted. The effect of fluctuations in fluid physical properties (relaxation time, zero shear viscosity, and surface tension), two-phase flow parameters (interphase velocity slip ratio), and atomizer operating parameters (ALR) is reported. The effect of one and two simultaneously fluctuating parameters on the drop size distribution is investigated. The results indicate that ALR and interphase velocity slip ratio, rather than liquid physical properties, have the most significant effect on the drop size distribution.


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